[PATCH V4 0/8] backlight: qcom-wled: Support for QCOM wled driver

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* [PATCH V4 0/8] backlight: qcom-wled: Support for QCOM wled driver
@ 2018-07-09 10:22 Kiran Gunda
  2018-07-09 10:22 ` [PATCH V4 1/8] backlight: qcom-wled: Rename pm8941-wled.c to qcom-wled.c Kiran Gunda
                   ` (8 more replies)
  0 siblings, 9 replies; 33+ messages in thread
From: Kiran Gunda @ 2018-07-09 10:22 UTC (permalink / raw)
  To: bjorn.andersson, jingoohan1, lee.jones, b.zolnierkie, dri-devel,
	daniel.thompson, jacek.anaszewski, pavel, robh+dt, mark.rutland,
	linux-leds, devicetree, linux-kernel
  Cc: linux-arm-msm, Kiran Gunda

This patch series renames the pm8941-wled.c driver to qcom-wled.c to add
the support for multiple PMICs supported by qualcomm. This patch series
supports both PM8941 and PMI8998 WLED. The PMI8998 WLED has the support
to handle the OVP (over voltage protection) and the SC (short circuit protection)
interrupts. It also has the auto string detection algorithm support to
configure the right strings if the user specified string configuration
is in-correct. These three features are added in this series for PMI8998.

changes from v1:
   - Fixed the commit message for
   - backlight: qcom-wled: Rename pm8941-wled.c to qcom-wled.c

Changes from v2:
   - Fixed bjorn and other reviewer's comments
   - Seperated the device tree bindings
   - Splitted out the WLED4 changes in seperate patch
   - Merged OVP and auto string detection patch

Changes from v3:
  - Added Reviewed-by/Acked-by tags
  - Fixed comments from Bjorn/Vinod/Rob
  - Splitting the "backlight: qcom-wled: Add support for WLED4 peripheral" patch
    to seperate the WLED3 specific restructure.

Kiran Gunda (8):
  backlight: qcom-wled: Rename pm8941-wled.c to qcom-wled.c
  backlight: qcom-wled: restructure the qcom-wled bindings
  backlight: qcom-wled: Add new properties for PMI8998
  backlight: qcom-wled: Rename PM8941* to WLED3
  backlight: qcom-wled: Restructure the driver for WLED3
  backlight: qcom-wled: Add support for WLED4 peripheral
  backlight: qcom-wled: add support for short circuit handling
  backlight: qcom-wled: Add auto string detection logic

 .../bindings/leds/backlight/pm8941-wled.txt        |   42 -
 .../bindings/leds/backlight/qcom-wled.txt          |  150 +++
 drivers/video/backlight/Kconfig                    |    8 +-
 drivers/video/backlight/Makefile                   |    2 +-
 drivers/video/backlight/pm8941-wled.c              |  432 -------
 drivers/video/backlight/qcom-wled.c                | 1298 ++++++++++++++++++++
 6 files changed, 1453 insertions(+), 479 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/leds/backlight/pm8941-wled.txt
 create mode 100644 Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt
 delete mode 100644 drivers/video/backlight/pm8941-wled.c
 create mode 100644 drivers/video/backlight/qcom-wled.c

-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
 a Linux Foundation Collaborative Project


^ permalink raw reply	[flat|nested] 33+ messages in thread

* [PATCH V4 1/8] backlight: qcom-wled: Rename pm8941-wled.c to qcom-wled.c
  2018-07-09 10:22 [PATCH V4 0/8] backlight: qcom-wled: Support for QCOM wled driver Kiran Gunda
@ 2018-07-09 10:22 ` Kiran Gunda
  2018-07-09 10:22 ` [PATCH V4 2/8] backlight: qcom-wled: restructure the qcom-wled bindings Kiran Gunda
                   ` (7 subsequent siblings)
  8 siblings, 0 replies; 33+ messages in thread
From: Kiran Gunda @ 2018-07-09 10:22 UTC (permalink / raw)
  To: bjorn.andersson, jingoohan1, lee.jones, b.zolnierkie, dri-devel,
	daniel.thompson, jacek.anaszewski, pavel, robh+dt, mark.rutland,
	linux-leds, devicetree, linux-kernel, linux-fbdev
  Cc: linux-arm-msm, Kiran Gunda

pm8941-wled.c driver is supporting the WLED peripheral
on pm8941. Rename it to qcom-wled.c so that it can support
WLED on multiple PMICs.

Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
---
changes from V3:
	Added Reviewed-by and Acked-by tags.

 .../bindings/leds/backlight/{pm8941-wled.txt => qcom-wled.txt}    | 2 +-
 drivers/video/backlight/Kconfig                                   | 8 ++++----
 drivers/video/backlight/Makefile                                  | 2 +-
 drivers/video/backlight/{pm8941-wled.c => qcom-wled.c}            | 0
 4 files changed, 6 insertions(+), 6 deletions(-)
 rename Documentation/devicetree/bindings/leds/backlight/{pm8941-wled.txt => qcom-wled.txt} (95%)
 rename drivers/video/backlight/{pm8941-wled.c => qcom-wled.c} (100%)

diff --git a/Documentation/devicetree/bindings/leds/backlight/pm8941-wled.txt b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt
similarity index 95%
rename from Documentation/devicetree/bindings/leds/backlight/pm8941-wled.txt
rename to Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt
index e5b294d..fb39e32 100644
--- a/Documentation/devicetree/bindings/leds/backlight/pm8941-wled.txt
+++ b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt
@@ -1,4 +1,4 @@
-Binding for Qualcomm PM8941 WLED driver
+Binding for Qualcomm Technologies, Inc. WLED driver
 
 Required properties:
 - compatible: should be "qcom,pm8941-wled"
diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 2919e23..2c29180 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -306,12 +306,12 @@ config BACKLIGHT_TOSA
 	  If you have an Sharp SL-6000 Zaurus say Y to enable a driver
 	  for its backlight
 
-config BACKLIGHT_PM8941_WLED
-	tristate "Qualcomm PM8941 WLED Driver"
+config BACKLIGHT_QCOM_WLED
+	tristate "Qualcomm PMIC WLED Driver"
 	select REGMAP
 	help
-	  If you have the Qualcomm PM8941, say Y to enable a driver for the
-	  WLED block.
+	  If you have the Qualcomm PMIC, say Y to enable a driver for the
+	  WLED block. Currently it supports PM8941 and PMI8998.
 
 config BACKLIGHT_SAHARA
 	tristate "Tabletkiosk Sahara Touch-iT Backlight Driver"
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index 0dcc2c7..741ab36 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -50,8 +50,8 @@ obj-$(CONFIG_BACKLIGHT_OMAP1)		+= omap1_bl.o
 obj-$(CONFIG_BACKLIGHT_OT200)		+= ot200_bl.o
 obj-$(CONFIG_BACKLIGHT_PANDORA)		+= pandora_bl.o
 obj-$(CONFIG_BACKLIGHT_PCF50633)	+= pcf50633-backlight.o
-obj-$(CONFIG_BACKLIGHT_PM8941_WLED)	+= pm8941-wled.o
 obj-$(CONFIG_BACKLIGHT_PWM)		+= pwm_bl.o
+obj-$(CONFIG_BACKLIGHT_QCOM_WLED)	+= qcom-wled.o
 obj-$(CONFIG_BACKLIGHT_SAHARA)		+= kb3886_bl.o
 obj-$(CONFIG_BACKLIGHT_SKY81452)	+= sky81452-backlight.o
 obj-$(CONFIG_BACKLIGHT_TOSA)		+= tosa_bl.o
diff --git a/drivers/video/backlight/pm8941-wled.c b/drivers/video/backlight/qcom-wled.c
similarity index 100%
rename from drivers/video/backlight/pm8941-wled.c
rename to drivers/video/backlight/qcom-wled.c
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
 a Linux Foundation Collaborative Project


^ permalink raw reply related	[flat|nested] 33+ messages in thread

* [PATCH V4 2/8] backlight: qcom-wled: restructure the qcom-wled bindings
  2018-07-09 10:22 [PATCH V4 0/8] backlight: qcom-wled: Support for QCOM wled driver Kiran Gunda
  2018-07-09 10:22 ` [PATCH V4 1/8] backlight: qcom-wled: Rename pm8941-wled.c to qcom-wled.c Kiran Gunda
@ 2018-07-09 10:22 ` Kiran Gunda
  2018-07-09 10:22 ` [PATCH V4 3/8] backlight: qcom-wled: Add new properties for PMI8998 Kiran Gunda
                   ` (6 subsequent siblings)
  8 siblings, 0 replies; 33+ messages in thread
From: Kiran Gunda @ 2018-07-09 10:22 UTC (permalink / raw)
  To: bjorn.andersson, jingoohan1, lee.jones, b.zolnierkie, dri-devel,
	daniel.thompson, jacek.anaszewski, pavel, robh+dt, mark.rutland,
	linux-leds, devicetree, linux-kernel
  Cc: linux-arm-msm, Kiran Gunda

Restructure the qcom-wled bindings for the better readability.

Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
---
Changes from V3:
	Added Reviewed-by and Acked-by tags.

 .../bindings/leds/backlight/qcom-wled.txt          | 110 ++++++++++++++++-----
 1 file changed, 85 insertions(+), 25 deletions(-)

diff --git a/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt
index fb39e32..14f28f2 100644
--- a/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt
+++ b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt
@@ -1,30 +1,90 @@
 Binding for Qualcomm Technologies, Inc. WLED driver
 
-Required properties:
-- compatible: should be "qcom,pm8941-wled"
-- reg: slave address
-
-Optional properties:
-- default-brightness: brightness value on boot, value from: 0-4095
-	default: 2048
-- label: The name of the backlight device
-- qcom,cs-out: bool; enable current sink output
-- qcom,cabc: bool; enable content adaptive backlight control
-- qcom,ext-gen: bool; use externally generated modulator signal to dim
-- qcom,current-limit: mA; per-string current limit; value from 0 to 25
-	default: 20mA
-- qcom,current-boost-limit: mA; boost current limit; one of:
-	105, 385, 525, 805, 980, 1260, 1400, 1680
-	default: 805mA
-- qcom,switching-freq: kHz; switching frequency; one of:
-	600, 640, 685, 738, 800, 872, 960, 1066, 1200, 1371,
-	1600, 1920, 2400, 3200, 4800, 9600,
-	default: 1600kHz
-- qcom,ovp: V; Over-voltage protection limit; one of:
-	27, 29, 32, 35
-	default: 29V
-- qcom,num-strings: #; number of led strings attached; value from 1 to 3
-	default: 2
+WLED (White Light Emitting Diode) driver is used for controlling display
+backlight that is part of PMIC on Qualcomm Technologies, Inc. reference
+platforms. The PMIC is connected to the host processor via SPMI bus.
+
+- compatible
+	Usage:        required
+	Value type:   <string>
+	Definition:   should be one of:
+			"qcom,pm8941-wled"
+			"qcom,pmi8998-wled"
+			"qcom,pm660l-wled"
+
+- reg
+	Usage:        required
+	Value type:   <prop encoded array>
+	Definition:   Base address of the WLED modules.
+
+- default-brightness
+	Usage:        optional
+	Value type:   <u32>
+	Definition:   brightness value on boot, value from: 0-4095
+		      Default: 2048
+
+- label
+	Usage:        required
+	Value type:   <string>
+	Definition:   The name of the backlight device
+
+- qcom,cs-out
+	Usage:        optional
+	Value type:   <bool>
+	Definition:   enable current sink output.
+		      This property is supported only for PM8941.
+
+- qcom,cabc
+	Usage:        optional
+	Value type:   <bool>
+	Definition:   enable content adaptive backlight control.
+
+- qcom,ext-gen
+	Usage:        optional
+	Value type:   <bool>
+	Definition:   use externally generated modulator signal to dim.
+		      This property is supported only for PM8941.
+
+- qcom,current-limit
+	Usage:        optional
+	Value type:   <u32>
+	Definition:   mA; per-string current limit
+		      value: For pm8941: from 0 to 25 with 5 mA step
+			     Default 20 mA.
+			     For pmi8998: from 0 to 30 with 5 mA step
+			     Default 25 mA.
+
+- qcom,current-boost-limit
+	Usage:        optional
+	Value type:   <u32>
+	Definition:   mA; boost current limit.
+		      For pm8941: one of: 105, 385, 525, 805, 980, 1260, 1400,
+		      1680. Default: 805 mA
+		      For pmi8998: one of: 105, 280, 450, 620, 970, 1150, 1300,
+		      1500. Default: 970 mA
+
+- qcom,switching-freq
+	Usage:        optional
+	Value type:   <u32>
+	 Definition:   kHz; switching frequency; one of: 600, 640, 685, 738,
+		       800, 872, 960, 1066, 1200, 1371, 1600, 1920, 2400, 3200,
+		       4800, 9600.
+		       Default: for pm8941: 1600 kHz
+				for pmi8998: 800 kHz
+
+- qcom,ovp
+	Usage:        optional
+	Value type:   <u32>
+	Definition:   V; Over-voltage protection limit; one of:
+		      27, 29, 32, 35. default: 29V
+		      This property is supported only for PM8941.
+
+- qcom,num-strings
+	Usage:        optional
+	Value type:   <u32>
+	Definition:   #; number of led strings attached;
+		      value from 1 to 3. default: 2
+		      This property is supported only for PM8941.
 
 Example:
 
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
 a Linux Foundation Collaborative Project


^ permalink raw reply related	[flat|nested] 33+ messages in thread

* [PATCH V4 3/8] backlight: qcom-wled: Add new properties for PMI8998
  2018-07-09 10:22 [PATCH V4 0/8] backlight: qcom-wled: Support for QCOM wled driver Kiran Gunda
  2018-07-09 10:22 ` [PATCH V4 1/8] backlight: qcom-wled: Rename pm8941-wled.c to qcom-wled.c Kiran Gunda
  2018-07-09 10:22 ` [PATCH V4 2/8] backlight: qcom-wled: restructure the qcom-wled bindings Kiran Gunda
@ 2018-07-09 10:22 ` Kiran Gunda
  2018-07-11 15:12   ` Rob Herring
                     ` (2 more replies)
  2018-07-09 10:22 ` [PATCH V4 4/8] backlight: qcom-wled: Rename PM8941* to WLED3 Kiran Gunda
                   ` (5 subsequent siblings)
  8 siblings, 3 replies; 33+ messages in thread
From: Kiran Gunda @ 2018-07-09 10:22 UTC (permalink / raw)
  To: bjorn.andersson, jingoohan1, lee.jones, b.zolnierkie, dri-devel,
	daniel.thompson, jacek.anaszewski, pavel, robh+dt, mark.rutland,
	linux-leds, devicetree, linux-kernel
  Cc: linux-arm-msm, Kiran Gunda

Update the bindings with the new properties used for
PMI8998.

Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
---
Changes from V3:
	- Removed the default values.
	- Removed pmi8998 example.

 .../bindings/leds/backlight/qcom-wled.txt          | 76 ++++++++++++++++++----
 1 file changed, 62 insertions(+), 14 deletions(-)

diff --git a/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt
index 14f28f2..3f22ced 100644
--- a/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt
+++ b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt
@@ -20,8 +20,7 @@ platforms. The PMIC is connected to the host processor via SPMI bus.
 - default-brightness
 	Usage:        optional
 	Value type:   <u32>
-	Definition:   brightness value on boot, value from: 0-4095
-		      Default: 2048
+	Definition:   brightness value on boot, value from: 0-4095.
 
 - label
 	Usage:        required
@@ -48,20 +47,24 @@ platforms. The PMIC is connected to the host processor via SPMI bus.
 - qcom,current-limit
 	Usage:        optional
 	Value type:   <u32>
-	Definition:   mA; per-string current limit
-		      value: For pm8941: from 0 to 25 with 5 mA step
-			     Default 20 mA.
-			     For pmi8998: from 0 to 30 with 5 mA step
-			     Default 25 mA.
+	Definition:   mA; per-string current limit; value from 0 to 25 with
+		      1 mA step.
+		      This property is supported only for pm8941.
+
+- qcom,current-limit-microamp
+	Usage:        optional
+	Value type:   <u32>
+	Definition:   uA; per-string current limit; value from 0 to 30000 with
+		      2500 uA step.
 
 - qcom,current-boost-limit
 	Usage:        optional
 	Value type:   <u32>
 	Definition:   mA; boost current limit.
 		      For pm8941: one of: 105, 385, 525, 805, 980, 1260, 1400,
-		      1680. Default: 805 mA
+		      1680.
 		      For pmi8998: one of: 105, 280, 450, 620, 970, 1150, 1300,
-		      1500. Default: 970 mA
+		      1500.
 
 - qcom,switching-freq
 	Usage:        optional
@@ -69,22 +72,66 @@ platforms. The PMIC is connected to the host processor via SPMI bus.
 	 Definition:   kHz; switching frequency; one of: 600, 640, 685, 738,
 		       800, 872, 960, 1066, 1200, 1371, 1600, 1920, 2400, 3200,
 		       4800, 9600.
-		       Default: for pm8941: 1600 kHz
-				for pmi8998: 800 kHz
 
 - qcom,ovp
 	Usage:        optional
 	Value type:   <u32>
 	Definition:   V; Over-voltage protection limit; one of:
-		      27, 29, 32, 35. default: 29V
+		      27, 29, 32, 35.
 		      This property is supported only for PM8941.
 
+- qcom,ovp-millivolt
+	Usage:        optional
+	Value type:   <u32>
+	Definition:   mV; Over-voltage protection limit;
+		      For pmi8998: one of 18100, 19600, 29600, 31100
+		      If this property is not specified for PM8941, it
+		      falls back to "qcom,ovp" property.
+
 - qcom,num-strings
 	Usage:        optional
 	Value type:   <u32>
 	Definition:   #; number of led strings attached;
-		      value from 1 to 3. default: 2
-		      This property is supported only for PM8941.
+		      value: For PM8941 from 1 to 3.
+			     For PMI8998 from 1 to 4.
+
+- interrupts
+	Usage:        optional
+	Value type:   <prop encoded array>
+	Definition:   Interrupts associated with WLED. This should be
+		      "short" and "ovp" interrupts. Interrupts can be
+		      specified as per the encoding listed under
+		      Documentation/devicetree/bindings/spmi/
+		      qcom,spmi-pmic-arb.txt.
+
+- interrupt-names
+	Usage:        optional
+	Value type:   <string>
+	Definition:   Interrupt names associated with the interrupts.
+		      Must be "short" and "ovp". The short circuit detection
+		      is not supported for PM8941.
+
+- qcom,enabled-strings
+	Usage:        optional
+	Value tyoe:   <u32 array>
+	Definition:   Array of the WLED strings numbered from 0 to 3. Each
+		      string of leds are operated individually. Specify the
+		      list of strings used by the device. Any combination of
+		      led strings can be used.
+
+- qcom,external-pfet
+	Usage:        optional
+	Value type:   <bool>
+	Definition:   Specify if external PFET control for short circuit
+		      protection is used. This property is supported only
+		      for PMI8998.
+
+- qcom,auto-string-detection
+	Usage:        optional
+	Value type:   <bool>
+	Definition:   Enables auto-detection of the WLED string configuration.
+		      This feature is not supported for PM8941.
+
 
 Example:
 
@@ -99,4 +146,5 @@ pm8941-wled@d800 {
 	qcom,switching-freq = <1600>;
 	qcom,ovp = <29>;
 	qcom,num-strings = <2>;
+	qcom,enabled-strings = <0x00 0x01>;
 };
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
 a Linux Foundation Collaborative Project


^ permalink raw reply related	[flat|nested] 33+ messages in thread

* Re: [PATCH V4 3/8] backlight: qcom-wled: Add new properties for PMI8998
  2018-07-09 10:22 ` [PATCH V4 3/8] backlight: qcom-wled: Add new properties for PMI8998 Kiran Gunda
@ 2018-07-11 15:12   ` Rob Herring
  2018-07-20 13:15   ` Daniel Thompson
  2018-08-07  5:23   ` Bjorn Andersson
  2 siblings, 0 replies; 33+ messages in thread
From: Rob Herring @ 2018-07-11 15:12 UTC (permalink / raw)
  To: Kiran Gunda
  Cc: bjorn.andersson, jingoohan1, lee.jones, b.zolnierkie, dri-devel,
	daniel.thompson, jacek.anaszewski, pavel, mark.rutland,
	linux-leds, devicetree, linux-kernel, linux-arm-msm

On Mon, Jul 09, 2018 at 03:52:16PM +0530, Kiran Gunda wrote:
> Update the bindings with the new properties used for
> PMI8998.
> 
> Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
> ---
> Changes from V3:
> 	- Removed the default values.
> 	- Removed pmi8998 example.
> 
>  .../bindings/leds/backlight/qcom-wled.txt          | 76 ++++++++++++++++++----
>  1 file changed, 62 insertions(+), 14 deletions(-)

Reviewed-by: Rob Herring <robh@kernel.org>

^ permalink raw reply	[flat|nested] 33+ messages in thread

* Re: [PATCH V4 3/8] backlight: qcom-wled: Add new properties for PMI8998
  2018-07-09 10:22 ` [PATCH V4 3/8] backlight: qcom-wled: Add new properties for PMI8998 Kiran Gunda
  2018-07-11 15:12   ` Rob Herring
@ 2018-07-20 13:15   ` Daniel Thompson
  2018-08-07  5:23   ` Bjorn Andersson
  2 siblings, 0 replies; 33+ messages in thread
From: Daniel Thompson @ 2018-07-20 13:15 UTC (permalink / raw)
  To: Kiran Gunda, bjorn.andersson, jingoohan1, lee.jones,
	b.zolnierkie, dri-devel, jacek.anaszewski, pavel, robh+dt,
	mark.rutland, linux-leds, devicetree, linux-kernel
  Cc: linux-arm-msm

On 09/07/18 11:22, Kiran Gunda wrote:
> Update the bindings with the new properties used for
> PMI8998.
> 
> Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>

Acked-by: Daniel Thompson <daniel.thompson@linaro.org>


> ---
> Changes from V3:
> 	- Removed the default values.
> 	- Removed pmi8998 example.
> 
>   .../bindings/leds/backlight/qcom-wled.txt          | 76 ++++++++++++++++++----
>   1 file changed, 62 insertions(+), 14 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt
> index 14f28f2..3f22ced 100644
> --- a/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt
> +++ b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt
> @@ -20,8 +20,7 @@ platforms. The PMIC is connected to the host processor via SPMI bus.
>   - default-brightness
>   	Usage:        optional
>   	Value type:   <u32>
> -	Definition:   brightness value on boot, value from: 0-4095
> -		      Default: 2048
> +	Definition:   brightness value on boot, value from: 0-4095.
>   
>   - label
>   	Usage:        required
> @@ -48,20 +47,24 @@ platforms. The PMIC is connected to the host processor via SPMI bus.
>   - qcom,current-limit
>   	Usage:        optional
>   	Value type:   <u32>
> -	Definition:   mA; per-string current limit
> -		      value: For pm8941: from 0 to 25 with 5 mA step
> -			     Default 20 mA.
> -			     For pmi8998: from 0 to 30 with 5 mA step
> -			     Default 25 mA.
> +	Definition:   mA; per-string current limit; value from 0 to 25 with
> +		      1 mA step.
> +		      This property is supported only for pm8941.
> +
> +- qcom,current-limit-microamp
> +	Usage:        optional
> +	Value type:   <u32>
> +	Definition:   uA; per-string current limit; value from 0 to 30000 with
> +		      2500 uA step.
>   
>   - qcom,current-boost-limit
>   	Usage:        optional
>   	Value type:   <u32>
>   	Definition:   mA; boost current limit.
>   		      For pm8941: one of: 105, 385, 525, 805, 980, 1260, 1400,
> -		      1680. Default: 805 mA
> +		      1680.
>   		      For pmi8998: one of: 105, 280, 450, 620, 970, 1150, 1300,
> -		      1500. Default: 970 mA
> +		      1500.
>   
>   - qcom,switching-freq
>   	Usage:        optional
> @@ -69,22 +72,66 @@ platforms. The PMIC is connected to the host processor via SPMI bus.
>   	 Definition:   kHz; switching frequency; one of: 600, 640, 685, 738,
>   		       800, 872, 960, 1066, 1200, 1371, 1600, 1920, 2400, 3200,
>   		       4800, 9600.
> -		       Default: for pm8941: 1600 kHz
> -				for pmi8998: 800 kHz
>   
>   - qcom,ovp
>   	Usage:        optional
>   	Value type:   <u32>
>   	Definition:   V; Over-voltage protection limit; one of:
> -		      27, 29, 32, 35. default: 29V
> +		      27, 29, 32, 35.
>   		      This property is supported only for PM8941.
>   
> +- qcom,ovp-millivolt
> +	Usage:        optional
> +	Value type:   <u32>
> +	Definition:   mV; Over-voltage protection limit;
> +		      For pmi8998: one of 18100, 19600, 29600, 31100
> +		      If this property is not specified for PM8941, it
> +		      falls back to "qcom,ovp" property.
> +
>   - qcom,num-strings
>   	Usage:        optional
>   	Value type:   <u32>
>   	Definition:   #; number of led strings attached;
> -		      value from 1 to 3. default: 2
> -		      This property is supported only for PM8941.
> +		      value: For PM8941 from 1 to 3.
> +			     For PMI8998 from 1 to 4.
> +
> +- interrupts
> +	Usage:        optional
> +	Value type:   <prop encoded array>
> +	Definition:   Interrupts associated with WLED. This should be
> +		      "short" and "ovp" interrupts. Interrupts can be
> +		      specified as per the encoding listed under
> +		      Documentation/devicetree/bindings/spmi/
> +		      qcom,spmi-pmic-arb.txt.
> +
> +- interrupt-names
> +	Usage:        optional
> +	Value type:   <string>
> +	Definition:   Interrupt names associated with the interrupts.
> +		      Must be "short" and "ovp". The short circuit detection
> +		      is not supported for PM8941.
> +
> +- qcom,enabled-strings
> +	Usage:        optional
> +	Value tyoe:   <u32 array>
> +	Definition:   Array of the WLED strings numbered from 0 to 3. Each
> +		      string of leds are operated individually. Specify the
> +		      list of strings used by the device. Any combination of
> +		      led strings can be used.
> +
> +- qcom,external-pfet
> +	Usage:        optional
> +	Value type:   <bool>
> +	Definition:   Specify if external PFET control for short circuit
> +		      protection is used. This property is supported only
> +		      for PMI8998.
> +
> +- qcom,auto-string-detection
> +	Usage:        optional
> +	Value type:   <bool>
> +	Definition:   Enables auto-detection of the WLED string configuration.
> +		      This feature is not supported for PM8941.
> +
>   
>   Example:
>   
> @@ -99,4 +146,5 @@ pm8941-wled@d800 {
>   	qcom,switching-freq = <1600>;
>   	qcom,ovp = <29>;
>   	qcom,num-strings = <2>;
> +	qcom,enabled-strings = <0x00 0x01>;
>   };
> 


^ permalink raw reply	[flat|nested] 33+ messages in thread

* Re: [PATCH V4 3/8] backlight: qcom-wled: Add new properties for PMI8998
  2018-07-09 10:22 ` [PATCH V4 3/8] backlight: qcom-wled: Add new properties for PMI8998 Kiran Gunda
  2018-07-11 15:12   ` Rob Herring
  2018-07-20 13:15   ` Daniel Thompson
@ 2018-08-07  5:23   ` Bjorn Andersson
  2018-08-16  5:23     ` kgunda
  2 siblings, 1 reply; 33+ messages in thread
From: Bjorn Andersson @ 2018-08-07  5:23 UTC (permalink / raw)
  To: Kiran Gunda
  Cc: jingoohan1, lee.jones, b.zolnierkie, dri-devel, daniel.thompson,
	jacek.anaszewski, pavel, robh+dt, mark.rutland, linux-leds,
	devicetree, linux-kernel, linux-arm-msm

On Mon 09 Jul 03:22 PDT 2018, Kiran Gunda wrote:
> diff --git a/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt
[..]
>  - qcom,num-strings
>  	Usage:        optional
>  	Value type:   <u32>
>  	Definition:   #; number of led strings attached;
> -		      value from 1 to 3. default: 2
> -		      This property is supported only for PM8941.
> +		      value: For PM8941 from 1 to 3.
> +			     For PMI8998 from 1 to 4.
[..]
> +- qcom,enabled-strings
> +	Usage:        optional
> +	Value tyoe:   <u32 array>
> +	Definition:   Array of the WLED strings numbered from 0 to 3. Each
> +		      string of leds are operated individually. Specify the
> +		      list of strings used by the device. Any combination of
> +		      led strings can be used.
[..]
>  
>  Example:
>  
> @@ -99,4 +146,5 @@ pm8941-wled@d800 {
>  	qcom,switching-freq = <1600>;
>  	qcom,ovp = <29>;
>  	qcom,num-strings = <2>;
> +	qcom,enabled-strings = <0x00 0x01>;

Nit. I would assume that specifying qcom,num-strings = <2> implies that
the first 2 strings are used, so one would not also specify
qcom,enabled-strings.

(And you should use decimal for natural numbers)


Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>

Regards,
Bjorn

^ permalink raw reply	[flat|nested] 33+ messages in thread

* Re: [PATCH V4 3/8] backlight: qcom-wled: Add new properties for PMI8998
  2018-08-07  5:23   ` Bjorn Andersson
@ 2018-08-16  5:23     ` kgunda
  2018-09-03 18:55       ` Bjorn Andersson
  0 siblings, 1 reply; 33+ messages in thread
From: kgunda @ 2018-08-16  5:23 UTC (permalink / raw)
  To: Bjorn Andersson
  Cc: jingoohan1, lee.jones, b.zolnierkie, dri-devel, daniel.thompson,
	jacek.anaszewski, pavel, robh+dt, mark.rutland, linux-leds,
	devicetree, linux-kernel, linux-arm-msm, linux-arm-msm-owner

On 2018-08-07 10:53, Bjorn Andersson wrote:
> On Mon 09 Jul 03:22 PDT 2018, Kiran Gunda wrote:
>> diff --git 
>> a/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt 
>> b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt
> [..]
>>  - qcom,num-strings
>>  	Usage:        optional
>>  	Value type:   <u32>
>>  	Definition:   #; number of led strings attached;
>> -		      value from 1 to 3. default: 2
>> -		      This property is supported only for PM8941.
>> +		      value: For PM8941 from 1 to 3.
>> +			     For PMI8998 from 1 to 4.
> [..]
>> +- qcom,enabled-strings
>> +	Usage:        optional
>> +	Value tyoe:   <u32 array>
>> +	Definition:   Array of the WLED strings numbered from 0 to 3. Each
>> +		      string of leds are operated individually. Specify the
>> +		      list of strings used by the device. Any combination of
>> +		      led strings can be used.
> [..]
>> 
>>  Example:
>> 
>> @@ -99,4 +146,5 @@ pm8941-wled@d800 {
>>  	qcom,switching-freq = <1600>;
>>  	qcom,ovp = <29>;
>>  	qcom,num-strings = <2>;
>> +	qcom,enabled-strings = <0x00 0x01>;
> 
> Nit. I would assume that specifying qcom,num-strings = <2> implies that
> the first 2 strings are used, so one would not also specify
> qcom,enabled-strings.
> 
Thanks Bjorn for reviewing the series !

"qcom,enabled-strings" need be specified along with the 
"qcom,num-strings".
Because the enabled-strings can be <0, 2> or <0, 3 > also. The driver 
picks the string
configuration from the enabled-strings array and enable only those 
current-sinks.

> (And you should use decimal for natural numbers)
> 
I will modify it in next series.
> 
> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> 
> Regards,
> Bjorn
> --
> To unsubscribe from this list: send the line "unsubscribe 
> linux-arm-msm" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

^ permalink raw reply	[flat|nested] 33+ messages in thread

* Re: [PATCH V4 3/8] backlight: qcom-wled: Add new properties for PMI8998
  2018-08-16  5:23     ` kgunda
@ 2018-09-03 18:55       ` Bjorn Andersson
  2018-09-26  5:31         ` kgunda
  0 siblings, 1 reply; 33+ messages in thread
From: Bjorn Andersson @ 2018-09-03 18:55 UTC (permalink / raw)
  To: kgunda
  Cc: jingoohan1, lee.jones, b.zolnierkie, dri-devel, daniel.thompson,
	jacek.anaszewski, pavel, robh+dt, mark.rutland, linux-leds,
	devicetree, linux-kernel, linux-arm-msm, linux-arm-msm-owner

On Wed 15 Aug 22:23 PDT 2018, kgunda@codeaurora.org wrote:

> On 2018-08-07 10:53, Bjorn Andersson wrote:
> > On Mon 09 Jul 03:22 PDT 2018, Kiran Gunda wrote:
> > > diff --git
> > > a/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt
> > > b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt
> > [..]
> > >  - qcom,num-strings
> > >  	Usage:        optional
> > >  	Value type:   <u32>
> > >  	Definition:   #; number of led strings attached;
> > > -		      value from 1 to 3. default: 2
> > > -		      This property is supported only for PM8941.
> > > +		      value: For PM8941 from 1 to 3.
> > > +			     For PMI8998 from 1 to 4.
> > [..]
> > > +- qcom,enabled-strings
> > > +	Usage:        optional
> > > +	Value tyoe:   <u32 array>
> > > +	Definition:   Array of the WLED strings numbered from 0 to 3. Each
> > > +		      string of leds are operated individually. Specify the
> > > +		      list of strings used by the device. Any combination of
> > > +		      led strings can be used.
> > [..]
> > > 
> > >  Example:
> > > 
> > > @@ -99,4 +146,5 @@ pm8941-wled@d800 {
> > >  	qcom,switching-freq = <1600>;
> > >  	qcom,ovp = <29>;
> > >  	qcom,num-strings = <2>;
> > > +	qcom,enabled-strings = <0x00 0x01>;
> > 
> > Nit. I would assume that specifying qcom,num-strings = <2> implies that
> > the first 2 strings are used, so one would not also specify
> > qcom,enabled-strings.
> > 
> Thanks Bjorn for reviewing the series !
> 
> "qcom,enabled-strings" need be specified along with the "qcom,num-strings".
> Because the enabled-strings can be <0, 2> or <0, 3 > also. The driver picks
> the string
> configuration from the enabled-strings array and enable only those
> current-sinks.
> 

The original binding described qcom,num-strings to mean "the first N
strings", requiring qcom,enabled-strings now would break backwards
compatibility with this binding.

In the case that qcom,enabled-strings is specified we can easily derive
num-strings from the listed entires. So I would suggest that you look
for enabled-strings and if not found fall back to checking for
num-strings.

Regards,
Bjorn

^ permalink raw reply	[flat|nested] 33+ messages in thread

* Re: [PATCH V4 3/8] backlight: qcom-wled: Add new properties for PMI8998
  2018-09-03 18:55       ` Bjorn Andersson
@ 2018-09-26  5:31         ` kgunda
  0 siblings, 0 replies; 33+ messages in thread
From: kgunda @ 2018-09-26  5:31 UTC (permalink / raw)
  To: Bjorn Andersson
  Cc: jingoohan1, lee.jones, b.zolnierkie, dri-devel, daniel.thompson,
	jacek.anaszewski, pavel, robh+dt, mark.rutland, linux-leds,
	devicetree, linux-kernel, linux-arm-msm, linux-arm-msm-owner

On 2018-09-04 00:25, Bjorn Andersson wrote:
> On Wed 15 Aug 22:23 PDT 2018, kgunda@codeaurora.org wrote:
> 
>> On 2018-08-07 10:53, Bjorn Andersson wrote:
>> > On Mon 09 Jul 03:22 PDT 2018, Kiran Gunda wrote:
>> > > diff --git
>> > > a/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt
>> > > b/Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt
>> > [..]
>> > >  - qcom,num-strings
>> > >  	Usage:        optional
>> > >  	Value type:   <u32>
>> > >  	Definition:   #; number of led strings attached;
>> > > -		      value from 1 to 3. default: 2
>> > > -		      This property is supported only for PM8941.
>> > > +		      value: For PM8941 from 1 to 3.
>> > > +			     For PMI8998 from 1 to 4.
>> > [..]
>> > > +- qcom,enabled-strings
>> > > +	Usage:        optional
>> > > +	Value tyoe:   <u32 array>
>> > > +	Definition:   Array of the WLED strings numbered from 0 to 3. Each
>> > > +		      string of leds are operated individually. Specify the
>> > > +		      list of strings used by the device. Any combination of
>> > > +		      led strings can be used.
>> > [..]
>> > >
>> > >  Example:
>> > >
>> > > @@ -99,4 +146,5 @@ pm8941-wled@d800 {
>> > >  	qcom,switching-freq = <1600>;
>> > >  	qcom,ovp = <29>;
>> > >  	qcom,num-strings = <2>;
>> > > +	qcom,enabled-strings = <0x00 0x01>;
>> >
>> > Nit. I would assume that specifying qcom,num-strings = <2> implies that
>> > the first 2 strings are used, so one would not also specify
>> > qcom,enabled-strings.
>> >
>> Thanks Bjorn for reviewing the series !
>> 
>> "qcom,enabled-strings" need be specified along with the 
>> "qcom,num-strings".
>> Because the enabled-strings can be <0, 2> or <0, 3 > also. The driver 
>> picks
>> the string
>> configuration from the enabled-strings array and enable only those
>> current-sinks.
>> 
> 
> The original binding described qcom,num-strings to mean "the first N
> strings", requiring qcom,enabled-strings now would break backwards
> compatibility with this binding.
> 
> In the case that qcom,enabled-strings is specified we can easily derive
> num-strings from the listed entires. So I would suggest that you look
> for enabled-strings and if not found fall back to checking for
> num-strings.
> 
> Regards,
> Bjorn

Sorry for the late reply. Actually the "qcom,enabled-strings" is 
initialized with
the strings 0, 1, 2, 3 in the driver. Even though this property is 
missing the first
N strings will be still configured with out any issue, based on the 
"qcom,num-strings".


^ permalink raw reply	[flat|nested] 33+ messages in thread

* [PATCH V4 4/8] backlight: qcom-wled: Rename PM8941* to WLED3
  2018-07-09 10:22 [PATCH V4 0/8] backlight: qcom-wled: Support for QCOM wled driver Kiran Gunda
                   ` (2 preceding siblings ...)
  2018-07-09 10:22 ` [PATCH V4 3/8] backlight: qcom-wled: Add new properties for PMI8998 Kiran Gunda
@ 2018-07-09 10:22 ` Kiran Gunda
  2018-07-20 13:23   ` Daniel Thompson
  2018-08-07  5:41   ` Bjorn Andersson
  2018-07-09 10:22 ` [PATCH V4 5/8] backlight: qcom-wled: Restructure the driver for WLED3 Kiran Gunda
                   ` (4 subsequent siblings)
  8 siblings, 2 replies; 33+ messages in thread
From: Kiran Gunda @ 2018-07-09 10:22 UTC (permalink / raw)
  To: bjorn.andersson, jingoohan1, lee.jones, b.zolnierkie, dri-devel,
	daniel.thompson, jacek.anaszewski, pavel, robh+dt, mark.rutland,
	linux-leds, devicetree, linux-kernel, linux-fbdev
  Cc: linux-arm-msm, Kiran Gunda

Rename the PM8941* references as WLED3 to make the
driver generic and have WLED support for other PMICs.

Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
---
Changes from V3:
	- Changed the MODULE_DESCRIPTION
	
 drivers/video/backlight/qcom-wled.c | 248 ++++++++++++++++++------------------
 1 file changed, 125 insertions(+), 123 deletions(-)

diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
index 0b6d219..3cd6e75 100644
--- a/drivers/video/backlight/qcom-wled.c
+++ b/drivers/video/backlight/qcom-wled.c
@@ -18,77 +18,79 @@
 #include <linux/regmap.h>
 
 /* From DT binding */
-#define PM8941_WLED_DEFAULT_BRIGHTNESS		2048
+#define WLED_DEFAULT_BRIGHTNESS				2048
 
-#define PM8941_WLED_REG_VAL_BASE		0x40
-#define  PM8941_WLED_REG_VAL_MAX		0xFFF
+#define WLED3_SINK_REG_BRIGHT_MAX			0xFFF
+#define WLED3_CTRL_REG_VAL_BASE				0x40
 
-#define PM8941_WLED_REG_MOD_EN			0x46
-#define  PM8941_WLED_REG_MOD_EN_BIT		BIT(7)
-#define  PM8941_WLED_REG_MOD_EN_MASK		BIT(7)
+/* WLED3 control registers */
+#define WLED3_CTRL_REG_MOD_EN				0x46
+#define  WLED3_CTRL_REG_MOD_EN_BIT			BIT(7)
+#define  WLED3_CTRL_REG_MOD_EN_MASK			BIT(7)
 
-#define PM8941_WLED_REG_SYNC			0x47
-#define  PM8941_WLED_REG_SYNC_MASK		0x07
-#define  PM8941_WLED_REG_SYNC_LED1		BIT(0)
-#define  PM8941_WLED_REG_SYNC_LED2		BIT(1)
-#define  PM8941_WLED_REG_SYNC_LED3		BIT(2)
-#define  PM8941_WLED_REG_SYNC_ALL		0x07
-#define  PM8941_WLED_REG_SYNC_CLEAR		0x00
+#define WLED3_CTRL_REG_FREQ				0x4c
+#define  WLED3_CTRL_REG_FREQ_MASK			0x0f
 
-#define PM8941_WLED_REG_FREQ			0x4c
-#define  PM8941_WLED_REG_FREQ_MASK		0x0f
+#define WLED3_CTRL_REG_OVP				0x4d
+#define  WLED3_CTRL_REG_OVP_MASK			0x03
 
-#define PM8941_WLED_REG_OVP			0x4d
-#define  PM8941_WLED_REG_OVP_MASK		0x03
+#define WLED3_CTRL_REG_ILIMIT				0x4e
+#define  WLED3_CTRL_REG_ILIMIT_MASK			0x07
 
-#define PM8941_WLED_REG_BOOST			0x4e
-#define  PM8941_WLED_REG_BOOST_MASK		0x07
+/* WLED3 sink registers */
+#define WLED3_SINK_REG_SYNC				0x47
+#define  WLED3_SINK_REG_SYNC_MASK			0x07
+#define  WLED3_SINK_REG_SYNC_LED1			BIT(0)
+#define  WLED3_SINK_REG_SYNC_LED2			BIT(1)
+#define  WLED3_SINK_REG_SYNC_LED3			BIT(2)
+#define  WLED3_SINK_REG_SYNC_ALL			0x07
+#define  WLED3_SINK_REG_SYNC_CLEAR			0x00
 
-#define PM8941_WLED_REG_SINK			0x4f
-#define  PM8941_WLED_REG_SINK_MASK		0xe0
-#define  PM8941_WLED_REG_SINK_SHFT		0x05
+#define WLED3_SINK_REG_CURR_SINK			0x4f
+#define  WLED3_SINK_REG_CURR_SINK_MASK			0xe0
+#define  WLED3_SINK_REG_CURR_SINK_SHFT			0x05
 
-/* Per-'string' registers below */
-#define PM8941_WLED_REG_STR_OFFSET		0x10
+/* WLED3 per-'string' registers below */
+#define WLED3_SINK_REG_STR_OFFSET			0x10
 
-#define PM8941_WLED_REG_STR_MOD_EN_BASE		0x60
-#define  PM8941_WLED_REG_STR_MOD_MASK		BIT(7)
-#define  PM8941_WLED_REG_STR_MOD_EN		BIT(7)
+#define WLED3_SINK_REG_STR_MOD_EN_BASE			0x60
+#define  WLED3_SINK_REG_STR_MOD_MASK			BIT(7)
+#define  WLED3_SINK_REG_STR_MOD_EN			BIT(7)
 
-#define PM8941_WLED_REG_STR_SCALE_BASE		0x62
-#define  PM8941_WLED_REG_STR_SCALE_MASK		0x1f
+#define WLED3_SINK_REG_STR_FULL_SCALE_CURR		0x62
+#define  WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK	0x1f
 
-#define PM8941_WLED_REG_STR_MOD_SRC_BASE	0x63
-#define  PM8941_WLED_REG_STR_MOD_SRC_MASK	0x01
-#define  PM8941_WLED_REG_STR_MOD_SRC_INT	0x00
-#define  PM8941_WLED_REG_STR_MOD_SRC_EXT	0x01
+#define WLED3_SINK_REG_STR_MOD_SRC_BASE			0x63
+#define  WLED3_SINK_REG_STR_MOD_SRC_MASK		0x01
+#define  WLED3_SINK_REG_STR_MOD_SRC_INT			0x00
+#define  WLED3_SINK_REG_STR_MOD_SRC_EXT			0x01
 
-#define PM8941_WLED_REG_STR_CABC_BASE		0x66
-#define  PM8941_WLED_REG_STR_CABC_MASK		BIT(7)
-#define  PM8941_WLED_REG_STR_CABC_EN		BIT(7)
+#define WLED3_SINK_REG_STR_CABC_BASE			0x66
+#define  WLED3_SINK_REG_STR_CABC_MASK			BIT(7)
+#define  WLED3_SINK_REG_STR_CABC_EN			BIT(7)
 
-struct pm8941_wled_config {
-	u32 i_boost_limit;
+struct wled_config {
+	u32 boost_i_limit;
 	u32 ovp;
 	u32 switch_freq;
 	u32 num_strings;
-	u32 i_limit;
+	u32 string_i_limit;
 	bool cs_out_en;
 	bool ext_gen;
 	bool cabc_en;
 };
 
-struct pm8941_wled {
+struct wled {
 	const char *name;
 	struct regmap *regmap;
 	u16 addr;
 
-	struct pm8941_wled_config cfg;
+	struct wled_config cfg;
 };
 
-static int pm8941_wled_update_status(struct backlight_device *bl)
+static int wled_update_status(struct backlight_device *bl)
 {
-	struct pm8941_wled *wled = bl_get_data(bl);
+	struct wled *wled = bl_get_data(bl);
 	u16 val = bl->props.brightness;
 	u8 ctrl = 0;
 	int rc;
@@ -100,11 +102,11 @@ static int pm8941_wled_update_status(struct backlight_device *bl)
 		val = 0;
 
 	if (val != 0)
-		ctrl = PM8941_WLED_REG_MOD_EN_BIT;
+		ctrl = WLED3_CTRL_REG_MOD_EN_BIT;
 
 	rc = regmap_update_bits(wled->regmap,
-			wled->addr + PM8941_WLED_REG_MOD_EN,
-			PM8941_WLED_REG_MOD_EN_MASK, ctrl);
+			wled->addr + WLED3_CTRL_REG_MOD_EN,
+			WLED3_CTRL_REG_MOD_EN_MASK, ctrl);
 	if (rc)
 		return rc;
 
@@ -112,89 +114,89 @@ static int pm8941_wled_update_status(struct backlight_device *bl)
 		u8 v[2] = { val & 0xff, (val >> 8) & 0xf };
 
 		rc = regmap_bulk_write(wled->regmap,
-				wled->addr + PM8941_WLED_REG_VAL_BASE + 2 * i,
+				wled->addr + WLED3_CTRL_REG_VAL_BASE + 2 * i,
 				v, 2);
 		if (rc)
 			return rc;
 	}
 
 	rc = regmap_update_bits(wled->regmap,
-			wled->addr + PM8941_WLED_REG_SYNC,
-			PM8941_WLED_REG_SYNC_MASK, PM8941_WLED_REG_SYNC_ALL);
+			wled->addr + WLED3_SINK_REG_SYNC,
+			WLED3_SINK_REG_SYNC_MASK, WLED3_SINK_REG_SYNC_ALL);
 	if (rc)
 		return rc;
 
 	rc = regmap_update_bits(wled->regmap,
-			wled->addr + PM8941_WLED_REG_SYNC,
-			PM8941_WLED_REG_SYNC_MASK, PM8941_WLED_REG_SYNC_CLEAR);
+			wled->addr + WLED3_SINK_REG_SYNC,
+			WLED3_SINK_REG_SYNC_MASK, WLED3_SINK_REG_SYNC_CLEAR);
 	return rc;
 }
 
-static int pm8941_wled_setup(struct pm8941_wled *wled)
+static int wled_setup(struct wled *wled)
 {
 	int rc;
 	int i;
 
 	rc = regmap_update_bits(wled->regmap,
-			wled->addr + PM8941_WLED_REG_OVP,
-			PM8941_WLED_REG_OVP_MASK, wled->cfg.ovp);
+			wled->addr + WLED3_CTRL_REG_OVP,
+			WLED3_CTRL_REG_OVP_MASK, wled->cfg.ovp);
 	if (rc)
 		return rc;
 
 	rc = regmap_update_bits(wled->regmap,
-			wled->addr + PM8941_WLED_REG_BOOST,
-			PM8941_WLED_REG_BOOST_MASK, wled->cfg.i_boost_limit);
+			wled->addr + WLED3_CTRL_REG_ILIMIT,
+			WLED3_CTRL_REG_ILIMIT_MASK, wled->cfg.boost_i_limit);
 	if (rc)
 		return rc;
 
 	rc = regmap_update_bits(wled->regmap,
-			wled->addr + PM8941_WLED_REG_FREQ,
-			PM8941_WLED_REG_FREQ_MASK, wled->cfg.switch_freq);
+			wled->addr + WLED3_CTRL_REG_FREQ,
+			WLED3_CTRL_REG_FREQ_MASK, wled->cfg.switch_freq);
 	if (rc)
 		return rc;
 
 	if (wled->cfg.cs_out_en) {
 		u8 all = (BIT(wled->cfg.num_strings) - 1)
-				<< PM8941_WLED_REG_SINK_SHFT;
+				<< WLED3_SINK_REG_CURR_SINK_SHFT;
 
 		rc = regmap_update_bits(wled->regmap,
-				wled->addr + PM8941_WLED_REG_SINK,
-				PM8941_WLED_REG_SINK_MASK, all);
+				wled->addr + WLED3_SINK_REG_CURR_SINK,
+				WLED3_SINK_REG_CURR_SINK_MASK, all);
 		if (rc)
 			return rc;
 	}
 
 	for (i = 0; i < wled->cfg.num_strings; ++i) {
-		u16 addr = wled->addr + PM8941_WLED_REG_STR_OFFSET * i;
+		u16 addr = wled->addr + WLED3_SINK_REG_STR_OFFSET * i;
 
 		rc = regmap_update_bits(wled->regmap,
-				addr + PM8941_WLED_REG_STR_MOD_EN_BASE,
-				PM8941_WLED_REG_STR_MOD_MASK,
-				PM8941_WLED_REG_STR_MOD_EN);
+				addr + WLED3_SINK_REG_STR_MOD_EN_BASE,
+				WLED3_SINK_REG_STR_MOD_MASK,
+				WLED3_SINK_REG_STR_MOD_EN);
 		if (rc)
 			return rc;
 
 		if (wled->cfg.ext_gen) {
 			rc = regmap_update_bits(wled->regmap,
-					addr + PM8941_WLED_REG_STR_MOD_SRC_BASE,
-					PM8941_WLED_REG_STR_MOD_SRC_MASK,
-					PM8941_WLED_REG_STR_MOD_SRC_EXT);
+					addr + WLED3_SINK_REG_STR_MOD_SRC_BASE,
+					WLED3_SINK_REG_STR_MOD_SRC_MASK,
+					WLED3_SINK_REG_STR_MOD_SRC_EXT);
 			if (rc)
 				return rc;
 		}
 
 		rc = regmap_update_bits(wled->regmap,
-				addr + PM8941_WLED_REG_STR_SCALE_BASE,
-				PM8941_WLED_REG_STR_SCALE_MASK,
-				wled->cfg.i_limit);
+				addr + WLED3_SINK_REG_STR_FULL_SCALE_CURR,
+				WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK,
+				wled->cfg.string_i_limit);
 		if (rc)
 			return rc;
 
 		rc = regmap_update_bits(wled->regmap,
-				addr + PM8941_WLED_REG_STR_CABC_BASE,
-				PM8941_WLED_REG_STR_CABC_MASK,
+				addr + WLED3_SINK_REG_STR_CABC_BASE,
+				WLED3_SINK_REG_STR_CABC_MASK,
 				wled->cfg.cabc_en ?
-					PM8941_WLED_REG_STR_CABC_EN : 0);
+					WLED3_SINK_REG_STR_CABC_EN : 0);
 		if (rc)
 			return rc;
 	}
@@ -202,9 +204,9 @@ static int pm8941_wled_setup(struct pm8941_wled *wled)
 	return 0;
 }
 
-static const struct pm8941_wled_config pm8941_wled_config_defaults = {
-	.i_boost_limit = 3,
-	.i_limit = 20,
+static const struct wled_config wled3_config_defaults = {
+	.boost_i_limit = 3,
+	.string_i_limit = 20,
 	.ovp = 2,
 	.switch_freq = 5,
 	.num_strings = 0,
@@ -213,55 +215,55 @@ static int pm8941_wled_setup(struct pm8941_wled *wled)
 	.cabc_en = false,
 };
 
-struct pm8941_wled_var_cfg {
+struct wled_var_cfg {
 	const u32 *values;
 	u32 (*fn)(u32);
 	int size;
 };
 
-static const u32 pm8941_wled_i_boost_limit_values[] = {
+static const u32 wled3_boost_i_limit_values[] = {
 	105, 385, 525, 805, 980, 1260, 1400, 1680,
 };
 
-static const struct pm8941_wled_var_cfg pm8941_wled_i_boost_limit_cfg = {
-	.values = pm8941_wled_i_boost_limit_values,
-	.size = ARRAY_SIZE(pm8941_wled_i_boost_limit_values),
+static const struct wled_var_cfg wled3_boost_i_limit_cfg = {
+	.values = wled3_boost_i_limit_values,
+	.size = ARRAY_SIZE(wled3_boost_i_limit_values),
 };
 
-static const u32 pm8941_wled_ovp_values[] = {
+static const u32 wled3_ovp_values[] = {
 	35, 32, 29, 27,
 };
 
-static const struct pm8941_wled_var_cfg pm8941_wled_ovp_cfg = {
-	.values = pm8941_wled_ovp_values,
-	.size = ARRAY_SIZE(pm8941_wled_ovp_values),
+static const struct wled_var_cfg wled3_ovp_cfg = {
+	.values = wled3_ovp_values,
+	.size = ARRAY_SIZE(wled3_ovp_values),
 };
 
-static u32 pm8941_wled_num_strings_values_fn(u32 idx)
+static u32 wled3_num_strings_values_fn(u32 idx)
 {
 	return idx + 1;
 }
 
-static const struct pm8941_wled_var_cfg pm8941_wled_num_strings_cfg = {
-	.fn = pm8941_wled_num_strings_values_fn,
+static const struct wled_var_cfg wled3_num_strings_cfg = {
+	.fn = wled3_num_strings_values_fn,
 	.size = 3,
 };
 
-static u32 pm8941_wled_switch_freq_values_fn(u32 idx)
+static u32 wled3_switch_freq_values_fn(u32 idx)
 {
 	return 19200 / (2 * (1 + idx));
 }
 
-static const struct pm8941_wled_var_cfg pm8941_wled_switch_freq_cfg = {
-	.fn = pm8941_wled_switch_freq_values_fn,
+static const struct wled_var_cfg wled3_switch_freq_cfg = {
+	.fn = wled3_switch_freq_values_fn,
 	.size = 16,
 };
 
-static const struct pm8941_wled_var_cfg pm8941_wled_i_limit_cfg = {
+static const struct wled_var_cfg wled3_string_i_limit_cfg = {
 	.size = 26,
 };
 
-static u32 pm8941_wled_values(const struct pm8941_wled_var_cfg *cfg, u32 idx)
+static u32 wled3_values(const struct wled_var_cfg *cfg, u32 idx)
 {
 	if (idx >= cfg->size)
 		return UINT_MAX;
@@ -272,9 +274,9 @@ static u32 pm8941_wled_values(const struct pm8941_wled_var_cfg *cfg, u32 idx)
 	return idx;
 }
 
-static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev)
+static int wled_configure(struct wled *wled, struct device *dev)
 {
-	struct pm8941_wled_config *cfg = &wled->cfg;
+	struct wled_config *cfg = &wled->cfg;
 	u32 val;
 	int rc;
 	u32 c;
@@ -284,32 +286,32 @@ static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev)
 	const struct {
 		const char *name;
 		u32 *val_ptr;
-		const struct pm8941_wled_var_cfg *cfg;
+		const struct wled_var_cfg *cfg;
 	} u32_opts[] = {
 		{
 			"qcom,current-boost-limit",
-			&cfg->i_boost_limit,
-			.cfg = &pm8941_wled_i_boost_limit_cfg,
+			&cfg->boost_i_limit,
+			.cfg = &wled3_boost_i_limit_cfg,
 		},
 		{
 			"qcom,current-limit",
-			&cfg->i_limit,
-			.cfg = &pm8941_wled_i_limit_cfg,
+			&cfg->string_i_limit,
+			.cfg = &wled3_string_i_limit_cfg,
 		},
 		{
 			"qcom,ovp",
 			&cfg->ovp,
-			.cfg = &pm8941_wled_ovp_cfg,
+			.cfg = &wled3_ovp_cfg,
 		},
 		{
 			"qcom,switching-freq",
 			&cfg->switch_freq,
-			.cfg = &pm8941_wled_switch_freq_cfg,
+			.cfg = &wled3_switch_freq_cfg,
 		},
 		{
 			"qcom,num-strings",
 			&cfg->num_strings,
-			.cfg = &pm8941_wled_num_strings_cfg,
+			.cfg = &wled3_num_strings_cfg,
 		},
 	};
 	const struct {
@@ -332,7 +334,7 @@ static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev)
 	if (rc)
 		wled->name = dev->of_node->name;
 
-	*cfg = pm8941_wled_config_defaults;
+	*cfg = wled3_config_defaults;
 	for (i = 0; i < ARRAY_SIZE(u32_opts); ++i) {
 		rc = of_property_read_u32(dev->of_node, u32_opts[i].name, &val);
 		if (rc == -EINVAL) {
@@ -344,7 +346,7 @@ static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev)
 
 		c = UINT_MAX;
 		for (j = 0; c != val; j++) {
-			c = pm8941_wled_values(u32_opts[i].cfg, j);
+			c = wled3_values(u32_opts[i].cfg, j);
 			if (c == UINT_MAX) {
 				dev_err(dev, "invalid value for '%s'\n",
 					u32_opts[i].name);
@@ -366,15 +368,15 @@ static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev)
 	return 0;
 }
 
-static const struct backlight_ops pm8941_wled_ops = {
-	.update_status = pm8941_wled_update_status,
+static const struct backlight_ops wled_ops = {
+	.update_status = wled_update_status,
 };
 
-static int pm8941_wled_probe(struct platform_device *pdev)
+static int wled_probe(struct platform_device *pdev)
 {
 	struct backlight_properties props;
 	struct backlight_device *bl;
-	struct pm8941_wled *wled;
+	struct wled *wled;
 	struct regmap *regmap;
 	u32 val;
 	int rc;
@@ -391,42 +393,42 @@ static int pm8941_wled_probe(struct platform_device *pdev)
 
 	wled->regmap = regmap;
 
-	rc = pm8941_wled_configure(wled, &pdev->dev);
+	rc = wled_configure(wled, &pdev->dev);
 	if (rc)
 		return rc;
 
-	rc = pm8941_wled_setup(wled);
+	rc = wled_setup(wled);
 	if (rc)
 		return rc;
 
-	val = PM8941_WLED_DEFAULT_BRIGHTNESS;
+	val = WLED_DEFAULT_BRIGHTNESS;
 	of_property_read_u32(pdev->dev.of_node, "default-brightness", &val);
 
 	memset(&props, 0, sizeof(struct backlight_properties));
 	props.type = BACKLIGHT_RAW;
 	props.brightness = val;
-	props.max_brightness = PM8941_WLED_REG_VAL_MAX;
+	props.max_brightness = WLED3_SINK_REG_BRIGHT_MAX;
 	bl = devm_backlight_device_register(&pdev->dev, wled->name,
 					    &pdev->dev, wled,
-					    &pm8941_wled_ops, &props);
+					    &wled_ops, &props);
 	return PTR_ERR_OR_ZERO(bl);
 };
 
-static const struct of_device_id pm8941_wled_match_table[] = {
+static const struct of_device_id wled_match_table[] = {
 	{ .compatible = "qcom,pm8941-wled" },
 	{}
 };
-MODULE_DEVICE_TABLE(of, pm8941_wled_match_table);
+MODULE_DEVICE_TABLE(of, wled_match_table);
 
-static struct platform_driver pm8941_wled_driver = {
-	.probe = pm8941_wled_probe,
+static struct platform_driver wled_driver = {
+	.probe = wled_probe,
 	.driver	= {
-		.name = "pm8941-wled",
-		.of_match_table	= pm8941_wled_match_table,
+		.name = "qcom,wled",
+		.of_match_table	= wled_match_table,
 	},
 };
 
-module_platform_driver(pm8941_wled_driver);
+module_platform_driver(wled_driver);
 
-MODULE_DESCRIPTION("pm8941 wled driver");
+MODULE_DESCRIPTION("Qualcomm WLED driver");
 MODULE_LICENSE("GPL v2");
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
 a Linux Foundation Collaborative Project


^ permalink raw reply related	[flat|nested] 33+ messages in thread

* Re: [PATCH V4 4/8] backlight: qcom-wled: Rename PM8941* to WLED3
  2018-07-09 10:22 ` [PATCH V4 4/8] backlight: qcom-wled: Rename PM8941* to WLED3 Kiran Gunda
@ 2018-07-20 13:23   ` Daniel Thompson
  2018-07-23  5:55     ` kgunda
  2018-08-07  5:41   ` Bjorn Andersson
  1 sibling, 1 reply; 33+ messages in thread
From: Daniel Thompson @ 2018-07-20 13:23 UTC (permalink / raw)
  To: Kiran Gunda, bjorn.andersson, jingoohan1, lee.jones,
	b.zolnierkie, dri-devel, jacek.anaszewski, pavel, robh+dt,
	mark.rutland, linux-leds, devicetree, linux-kernel, linux-fbdev
  Cc: linux-arm-msm

On 09/07/18 11:22, Kiran Gunda wrote:
> Rename the PM8941* references as WLED3 to make the
> driver generic and have WLED support for other PMICs.
> 
> Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
> ---
> Changes from V3:
> 	- Changed the MODULE_DESCRIPTION
> 	
>   drivers/video/backlight/qcom-wled.c | 248 ++++++++++++++++++------------------
>   1 file changed, 125 insertions(+), 123 deletions(-)
> 
> diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
> index 0b6d219..3cd6e75 100644
> --- a/drivers/video/backlight/qcom-wled.c
> +++ b/drivers/video/backlight/qcom-wled.c
> @@ -18,77 +18,79 @@
>   #include <linux/regmap.h>
>   
>   /* From DT binding */
> -#define PM8941_WLED_DEFAULT_BRIGHTNESS		2048
> +#define WLED_DEFAULT_BRIGHTNESS				2048
>   
> -#define PM8941_WLED_REG_VAL_BASE		0x40
> -#define  PM8941_WLED_REG_VAL_MAX		0xFFF
> +#define WLED3_SINK_REG_BRIGHT_MAX			0xFFF
> +#define WLED3_CTRL_REG_VAL_BASE				0x40
>   
> -#define PM8941_WLED_REG_MOD_EN			0x46
> -#define  PM8941_WLED_REG_MOD_EN_BIT		BIT(7)
> -#define  PM8941_WLED_REG_MOD_EN_MASK		BIT(7)
> +/* WLED3 control registers */
> +#define WLED3_CTRL_REG_MOD_EN				0x46
> +#define  WLED3_CTRL_REG_MOD_EN_BIT			BIT(7)
> +#define  WLED3_CTRL_REG_MOD_EN_MASK			BIT(7)
>   
> -#define PM8941_WLED_REG_SYNC			0x47
> -#define  PM8941_WLED_REG_SYNC_MASK		0x07
> -#define  PM8941_WLED_REG_SYNC_LED1		BIT(0)
> -#define  PM8941_WLED_REG_SYNC_LED2		BIT(1)
> -#define  PM8941_WLED_REG_SYNC_LED3		BIT(2)
> -#define  PM8941_WLED_REG_SYNC_ALL		0x07
> -#define  PM8941_WLED_REG_SYNC_CLEAR		0x00
> +#define WLED3_CTRL_REG_FREQ				0x4c
> +#define  WLED3_CTRL_REG_FREQ_MASK			0x0f
>   
> -#define PM8941_WLED_REG_FREQ			0x4c
> -#define  PM8941_WLED_REG_FREQ_MASK		0x0f
> +#define WLED3_CTRL_REG_OVP				0x4d
> +#define  WLED3_CTRL_REG_OVP_MASK			0x03
>   
> -#define PM8941_WLED_REG_OVP			0x4d
> -#define  PM8941_WLED_REG_OVP_MASK		0x03
> +#define WLED3_CTRL_REG_ILIMIT				0x4e
> +#define  WLED3_CTRL_REG_ILIMIT_MASK			0x07
>   
> -#define PM8941_WLED_REG_BOOST			0x4e
> -#define  PM8941_WLED_REG_BOOST_MASK		0x07
> +/* WLED3 sink registers */
> +#define WLED3_SINK_REG_SYNC				0x47
> +#define  WLED3_SINK_REG_SYNC_MASK			0x07
> +#define  WLED3_SINK_REG_SYNC_LED1			BIT(0)
> +#define  WLED3_SINK_REG_SYNC_LED2			BIT(1)
> +#define  WLED3_SINK_REG_SYNC_LED3			BIT(2)
> +#define  WLED3_SINK_REG_SYNC_ALL			0x07
> +#define  WLED3_SINK_REG_SYNC_CLEAR			0x00
>   
> -#define PM8941_WLED_REG_SINK			0x4f
> -#define  PM8941_WLED_REG_SINK_MASK		0xe0
> -#define  PM8941_WLED_REG_SINK_SHFT		0x05
> +#define WLED3_SINK_REG_CURR_SINK			0x4f
> +#define  WLED3_SINK_REG_CURR_SINK_MASK			0xe0
> +#define  WLED3_SINK_REG_CURR_SINK_SHFT			0x05
>   
> -/* Per-'string' registers below */
> -#define PM8941_WLED_REG_STR_OFFSET		0x10
> +/* WLED3 per-'string' registers below */
> +#define WLED3_SINK_REG_STR_OFFSET			0x10
>   
> -#define PM8941_WLED_REG_STR_MOD_EN_BASE		0x60
> -#define  PM8941_WLED_REG_STR_MOD_MASK		BIT(7)
> -#define  PM8941_WLED_REG_STR_MOD_EN		BIT(7)
> +#define WLED3_SINK_REG_STR_MOD_EN_BASE			0x60
> +#define  WLED3_SINK_REG_STR_MOD_MASK			BIT(7)
> +#define  WLED3_SINK_REG_STR_MOD_EN			BIT(7)
>   
> -#define PM8941_WLED_REG_STR_SCALE_BASE		0x62
> -#define  PM8941_WLED_REG_STR_SCALE_MASK		0x1f
> +#define WLED3_SINK_REG_STR_FULL_SCALE_CURR		0x62
> +#define  WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK	0x1f
>   
> -#define PM8941_WLED_REG_STR_MOD_SRC_BASE	0x63
> -#define  PM8941_WLED_REG_STR_MOD_SRC_MASK	0x01
> -#define  PM8941_WLED_REG_STR_MOD_SRC_INT	0x00
> -#define  PM8941_WLED_REG_STR_MOD_SRC_EXT	0x01
> +#define WLED3_SINK_REG_STR_MOD_SRC_BASE			0x63
> +#define  WLED3_SINK_REG_STR_MOD_SRC_MASK		0x01
> +#define  WLED3_SINK_REG_STR_MOD_SRC_INT			0x00
> +#define  WLED3_SINK_REG_STR_MOD_SRC_EXT			0x01
>   
> -#define PM8941_WLED_REG_STR_CABC_BASE		0x66
> -#define  PM8941_WLED_REG_STR_CABC_MASK		BIT(7)
> -#define  PM8941_WLED_REG_STR_CABC_EN		BIT(7)
> +#define WLED3_SINK_REG_STR_CABC_BASE			0x66
> +#define  WLED3_SINK_REG_STR_CABC_MASK			BIT(7)
> +#define  WLED3_SINK_REG_STR_CABC_EN			BIT(7)
>   
> -struct pm8941_wled_config {
> -	u32 i_boost_limit;
> +struct wled_config {
> +	u32 boost_i_limit;
>   	u32 ovp;
>   	u32 switch_freq;
>   	u32 num_strings;
> -	u32 i_limit;
> +	u32 string_i_limit;

This patch implements a grand renaming and I have no objections to 
including change for boost_i_limit and string_i_limit in it. I'd prefer 
it to be mentioned in the patch header though.

Once that is done:

Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>

^ permalink raw reply	[flat|nested] 33+ messages in thread

* Re: [PATCH V4 4/8] backlight: qcom-wled: Rename PM8941* to WLED3
  2018-07-20 13:23   ` Daniel Thompson
@ 2018-07-23  5:55     ` kgunda
  0 siblings, 0 replies; 33+ messages in thread
From: kgunda @ 2018-07-23  5:55 UTC (permalink / raw)
  To: Daniel Thompson
  Cc: bjorn.andersson, jingoohan1, lee.jones, b.zolnierkie, dri-devel,
	jacek.anaszewski, pavel, robh+dt, mark.rutland, linux-leds,
	devicetree, linux-kernel, linux-fbdev, linux-arm-msm

On 2018-07-20 18:53, Daniel Thompson wrote:
> On 09/07/18 11:22, Kiran Gunda wrote:
>> Rename the PM8941* references as WLED3 to make the
>> driver generic and have WLED support for other PMICs.
>> 
>> Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
>> ---
>> Changes from V3:
>> 	- Changed the MODULE_DESCRIPTION
>> 
>>   drivers/video/backlight/qcom-wled.c | 248 
>> ++++++++++++++++++------------------
>>   1 file changed, 125 insertions(+), 123 deletions(-)
>> 
>> diff --git a/drivers/video/backlight/qcom-wled.c 
>> b/drivers/video/backlight/qcom-wled.c
>> index 0b6d219..3cd6e75 100644
>> --- a/drivers/video/backlight/qcom-wled.c
>> +++ b/drivers/video/backlight/qcom-wled.c
>> @@ -18,77 +18,79 @@
>>   #include <linux/regmap.h>
>>     /* From DT binding */
>> -#define PM8941_WLED_DEFAULT_BRIGHTNESS		2048
>> +#define WLED_DEFAULT_BRIGHTNESS				2048
>>   -#define PM8941_WLED_REG_VAL_BASE		0x40
>> -#define  PM8941_WLED_REG_VAL_MAX		0xFFF
>> +#define WLED3_SINK_REG_BRIGHT_MAX			0xFFF
>> +#define WLED3_CTRL_REG_VAL_BASE				0x40
>>   -#define PM8941_WLED_REG_MOD_EN			0x46
>> -#define  PM8941_WLED_REG_MOD_EN_BIT		BIT(7)
>> -#define  PM8941_WLED_REG_MOD_EN_MASK		BIT(7)
>> +/* WLED3 control registers */
>> +#define WLED3_CTRL_REG_MOD_EN				0x46
>> +#define  WLED3_CTRL_REG_MOD_EN_BIT			BIT(7)
>> +#define  WLED3_CTRL_REG_MOD_EN_MASK			BIT(7)
>>   -#define PM8941_WLED_REG_SYNC			0x47
>> -#define  PM8941_WLED_REG_SYNC_MASK		0x07
>> -#define  PM8941_WLED_REG_SYNC_LED1		BIT(0)
>> -#define  PM8941_WLED_REG_SYNC_LED2		BIT(1)
>> -#define  PM8941_WLED_REG_SYNC_LED3		BIT(2)
>> -#define  PM8941_WLED_REG_SYNC_ALL		0x07
>> -#define  PM8941_WLED_REG_SYNC_CLEAR		0x00
>> +#define WLED3_CTRL_REG_FREQ				0x4c
>> +#define  WLED3_CTRL_REG_FREQ_MASK			0x0f
>>   -#define PM8941_WLED_REG_FREQ			0x4c
>> -#define  PM8941_WLED_REG_FREQ_MASK		0x0f
>> +#define WLED3_CTRL_REG_OVP				0x4d
>> +#define  WLED3_CTRL_REG_OVP_MASK			0x03
>>   -#define PM8941_WLED_REG_OVP			0x4d
>> -#define  PM8941_WLED_REG_OVP_MASK		0x03
>> +#define WLED3_CTRL_REG_ILIMIT				0x4e
>> +#define  WLED3_CTRL_REG_ILIMIT_MASK			0x07
>>   -#define PM8941_WLED_REG_BOOST			0x4e
>> -#define  PM8941_WLED_REG_BOOST_MASK		0x07
>> +/* WLED3 sink registers */
>> +#define WLED3_SINK_REG_SYNC				0x47
>> +#define  WLED3_SINK_REG_SYNC_MASK			0x07
>> +#define  WLED3_SINK_REG_SYNC_LED1			BIT(0)
>> +#define  WLED3_SINK_REG_SYNC_LED2			BIT(1)
>> +#define  WLED3_SINK_REG_SYNC_LED3			BIT(2)
>> +#define  WLED3_SINK_REG_SYNC_ALL			0x07
>> +#define  WLED3_SINK_REG_SYNC_CLEAR			0x00
>>   -#define PM8941_WLED_REG_SINK			0x4f
>> -#define  PM8941_WLED_REG_SINK_MASK		0xe0
>> -#define  PM8941_WLED_REG_SINK_SHFT		0x05
>> +#define WLED3_SINK_REG_CURR_SINK			0x4f
>> +#define  WLED3_SINK_REG_CURR_SINK_MASK			0xe0
>> +#define  WLED3_SINK_REG_CURR_SINK_SHFT			0x05
>>   -/* Per-'string' registers below */
>> -#define PM8941_WLED_REG_STR_OFFSET		0x10
>> +/* WLED3 per-'string' registers below */
>> +#define WLED3_SINK_REG_STR_OFFSET			0x10
>>   -#define PM8941_WLED_REG_STR_MOD_EN_BASE		0x60
>> -#define  PM8941_WLED_REG_STR_MOD_MASK		BIT(7)
>> -#define  PM8941_WLED_REG_STR_MOD_EN		BIT(7)
>> +#define WLED3_SINK_REG_STR_MOD_EN_BASE			0x60
>> +#define  WLED3_SINK_REG_STR_MOD_MASK			BIT(7)
>> +#define  WLED3_SINK_REG_STR_MOD_EN			BIT(7)
>>   -#define PM8941_WLED_REG_STR_SCALE_BASE		0x62
>> -#define  PM8941_WLED_REG_STR_SCALE_MASK		0x1f
>> +#define WLED3_SINK_REG_STR_FULL_SCALE_CURR		0x62
>> +#define  WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK	0x1f
>>   -#define PM8941_WLED_REG_STR_MOD_SRC_BASE	0x63
>> -#define  PM8941_WLED_REG_STR_MOD_SRC_MASK	0x01
>> -#define  PM8941_WLED_REG_STR_MOD_SRC_INT	0x00
>> -#define  PM8941_WLED_REG_STR_MOD_SRC_EXT	0x01
>> +#define WLED3_SINK_REG_STR_MOD_SRC_BASE			0x63
>> +#define  WLED3_SINK_REG_STR_MOD_SRC_MASK		0x01
>> +#define  WLED3_SINK_REG_STR_MOD_SRC_INT			0x00
>> +#define  WLED3_SINK_REG_STR_MOD_SRC_EXT			0x01
>>   -#define PM8941_WLED_REG_STR_CABC_BASE		0x66
>> -#define  PM8941_WLED_REG_STR_CABC_MASK		BIT(7)
>> -#define  PM8941_WLED_REG_STR_CABC_EN		BIT(7)
>> +#define WLED3_SINK_REG_STR_CABC_BASE			0x66
>> +#define  WLED3_SINK_REG_STR_CABC_MASK			BIT(7)
>> +#define  WLED3_SINK_REG_STR_CABC_EN			BIT(7)
>>   -struct pm8941_wled_config {
>> -	u32 i_boost_limit;
>> +struct wled_config {
>> +	u32 boost_i_limit;
>>   	u32 ovp;
>>   	u32 switch_freq;
>>   	u32 num_strings;
>> -	u32 i_limit;
>> +	u32 string_i_limit;
> 
> This patch implements a grand renaming and I have no objections to
> including change for boost_i_limit and string_i_limit in it. I'd
> prefer it to be mentioned in the patch header though.
> 
> Once that is done:
> 
> Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Thanks Daneil. I will include it in the patch header in next series.

^ permalink raw reply	[flat|nested] 33+ messages in thread

* Re: [PATCH V4 4/8] backlight: qcom-wled: Rename PM8941* to WLED3
  2018-07-09 10:22 ` [PATCH V4 4/8] backlight: qcom-wled: Rename PM8941* to WLED3 Kiran Gunda
  2018-07-20 13:23   ` Daniel Thompson
@ 2018-08-07  5:41   ` Bjorn Andersson
  2018-08-16  5:30     ` kgunda
  1 sibling, 1 reply; 33+ messages in thread
From: Bjorn Andersson @ 2018-08-07  5:41 UTC (permalink / raw)
  To: Kiran Gunda
  Cc: jingoohan1, lee.jones, b.zolnierkie, dri-devel, daniel.thompson,
	jacek.anaszewski, pavel, robh+dt, mark.rutland, linux-leds,
	devicetree, linux-kernel, linux-fbdev, linux-arm-msm

On Mon 09 Jul 03:22 PDT 2018, Kiran Gunda wrote:

> Rename the PM8941* references as WLED3 to make the
> driver generic and have WLED support for other PMICs.
> 
> Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>

I agree with Daniel, regarding the mentioning of the variable rename.

Apart from that:

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>

Regards,
Bjorn

> ---
> Changes from V3:
> 	- Changed the MODULE_DESCRIPTION
> 	
>  drivers/video/backlight/qcom-wled.c | 248 ++++++++++++++++++------------------
>  1 file changed, 125 insertions(+), 123 deletions(-)
> 
> diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
> index 0b6d219..3cd6e75 100644
> --- a/drivers/video/backlight/qcom-wled.c
> +++ b/drivers/video/backlight/qcom-wled.c
> @@ -18,77 +18,79 @@
>  #include <linux/regmap.h>
>  
>  /* From DT binding */
> -#define PM8941_WLED_DEFAULT_BRIGHTNESS		2048
> +#define WLED_DEFAULT_BRIGHTNESS				2048
>  
> -#define PM8941_WLED_REG_VAL_BASE		0x40
> -#define  PM8941_WLED_REG_VAL_MAX		0xFFF
> +#define WLED3_SINK_REG_BRIGHT_MAX			0xFFF
> +#define WLED3_CTRL_REG_VAL_BASE				0x40
>  
> -#define PM8941_WLED_REG_MOD_EN			0x46
> -#define  PM8941_WLED_REG_MOD_EN_BIT		BIT(7)
> -#define  PM8941_WLED_REG_MOD_EN_MASK		BIT(7)
> +/* WLED3 control registers */
> +#define WLED3_CTRL_REG_MOD_EN				0x46
> +#define  WLED3_CTRL_REG_MOD_EN_BIT			BIT(7)
> +#define  WLED3_CTRL_REG_MOD_EN_MASK			BIT(7)
>  
> -#define PM8941_WLED_REG_SYNC			0x47
> -#define  PM8941_WLED_REG_SYNC_MASK		0x07
> -#define  PM8941_WLED_REG_SYNC_LED1		BIT(0)
> -#define  PM8941_WLED_REG_SYNC_LED2		BIT(1)
> -#define  PM8941_WLED_REG_SYNC_LED3		BIT(2)
> -#define  PM8941_WLED_REG_SYNC_ALL		0x07
> -#define  PM8941_WLED_REG_SYNC_CLEAR		0x00
> +#define WLED3_CTRL_REG_FREQ				0x4c
> +#define  WLED3_CTRL_REG_FREQ_MASK			0x0f
>  
> -#define PM8941_WLED_REG_FREQ			0x4c
> -#define  PM8941_WLED_REG_FREQ_MASK		0x0f
> +#define WLED3_CTRL_REG_OVP				0x4d
> +#define  WLED3_CTRL_REG_OVP_MASK			0x03
>  
> -#define PM8941_WLED_REG_OVP			0x4d
> -#define  PM8941_WLED_REG_OVP_MASK		0x03
> +#define WLED3_CTRL_REG_ILIMIT				0x4e
> +#define  WLED3_CTRL_REG_ILIMIT_MASK			0x07
>  
> -#define PM8941_WLED_REG_BOOST			0x4e
> -#define  PM8941_WLED_REG_BOOST_MASK		0x07
> +/* WLED3 sink registers */
> +#define WLED3_SINK_REG_SYNC				0x47
> +#define  WLED3_SINK_REG_SYNC_MASK			0x07
> +#define  WLED3_SINK_REG_SYNC_LED1			BIT(0)
> +#define  WLED3_SINK_REG_SYNC_LED2			BIT(1)
> +#define  WLED3_SINK_REG_SYNC_LED3			BIT(2)
> +#define  WLED3_SINK_REG_SYNC_ALL			0x07
> +#define  WLED3_SINK_REG_SYNC_CLEAR			0x00
>  
> -#define PM8941_WLED_REG_SINK			0x4f
> -#define  PM8941_WLED_REG_SINK_MASK		0xe0
> -#define  PM8941_WLED_REG_SINK_SHFT		0x05
> +#define WLED3_SINK_REG_CURR_SINK			0x4f
> +#define  WLED3_SINK_REG_CURR_SINK_MASK			0xe0
> +#define  WLED3_SINK_REG_CURR_SINK_SHFT			0x05
>  
> -/* Per-'string' registers below */
> -#define PM8941_WLED_REG_STR_OFFSET		0x10
> +/* WLED3 per-'string' registers below */
> +#define WLED3_SINK_REG_STR_OFFSET			0x10
>  
> -#define PM8941_WLED_REG_STR_MOD_EN_BASE		0x60
> -#define  PM8941_WLED_REG_STR_MOD_MASK		BIT(7)
> -#define  PM8941_WLED_REG_STR_MOD_EN		BIT(7)
> +#define WLED3_SINK_REG_STR_MOD_EN_BASE			0x60
> +#define  WLED3_SINK_REG_STR_MOD_MASK			BIT(7)
> +#define  WLED3_SINK_REG_STR_MOD_EN			BIT(7)
>  
> -#define PM8941_WLED_REG_STR_SCALE_BASE		0x62
> -#define  PM8941_WLED_REG_STR_SCALE_MASK		0x1f
> +#define WLED3_SINK_REG_STR_FULL_SCALE_CURR		0x62
> +#define  WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK	0x1f
>  
> -#define PM8941_WLED_REG_STR_MOD_SRC_BASE	0x63
> -#define  PM8941_WLED_REG_STR_MOD_SRC_MASK	0x01
> -#define  PM8941_WLED_REG_STR_MOD_SRC_INT	0x00
> -#define  PM8941_WLED_REG_STR_MOD_SRC_EXT	0x01
> +#define WLED3_SINK_REG_STR_MOD_SRC_BASE			0x63
> +#define  WLED3_SINK_REG_STR_MOD_SRC_MASK		0x01
> +#define  WLED3_SINK_REG_STR_MOD_SRC_INT			0x00
> +#define  WLED3_SINK_REG_STR_MOD_SRC_EXT			0x01
>  
> -#define PM8941_WLED_REG_STR_CABC_BASE		0x66
> -#define  PM8941_WLED_REG_STR_CABC_MASK		BIT(7)
> -#define  PM8941_WLED_REG_STR_CABC_EN		BIT(7)
> +#define WLED3_SINK_REG_STR_CABC_BASE			0x66
> +#define  WLED3_SINK_REG_STR_CABC_MASK			BIT(7)
> +#define  WLED3_SINK_REG_STR_CABC_EN			BIT(7)
>  
> -struct pm8941_wled_config {
> -	u32 i_boost_limit;
> +struct wled_config {
> +	u32 boost_i_limit;
>  	u32 ovp;
>  	u32 switch_freq;
>  	u32 num_strings;
> -	u32 i_limit;
> +	u32 string_i_limit;
>  	bool cs_out_en;
>  	bool ext_gen;
>  	bool cabc_en;
>  };
>  
> -struct pm8941_wled {
> +struct wled {
>  	const char *name;
>  	struct regmap *regmap;
>  	u16 addr;
>  
> -	struct pm8941_wled_config cfg;
> +	struct wled_config cfg;
>  };
>  
> -static int pm8941_wled_update_status(struct backlight_device *bl)
> +static int wled_update_status(struct backlight_device *bl)
>  {
> -	struct pm8941_wled *wled = bl_get_data(bl);
> +	struct wled *wled = bl_get_data(bl);
>  	u16 val = bl->props.brightness;
>  	u8 ctrl = 0;
>  	int rc;
> @@ -100,11 +102,11 @@ static int pm8941_wled_update_status(struct backlight_device *bl)
>  		val = 0;
>  
>  	if (val != 0)
> -		ctrl = PM8941_WLED_REG_MOD_EN_BIT;
> +		ctrl = WLED3_CTRL_REG_MOD_EN_BIT;
>  
>  	rc = regmap_update_bits(wled->regmap,
> -			wled->addr + PM8941_WLED_REG_MOD_EN,
> -			PM8941_WLED_REG_MOD_EN_MASK, ctrl);
> +			wled->addr + WLED3_CTRL_REG_MOD_EN,
> +			WLED3_CTRL_REG_MOD_EN_MASK, ctrl);
>  	if (rc)
>  		return rc;
>  
> @@ -112,89 +114,89 @@ static int pm8941_wled_update_status(struct backlight_device *bl)
>  		u8 v[2] = { val & 0xff, (val >> 8) & 0xf };
>  
>  		rc = regmap_bulk_write(wled->regmap,
> -				wled->addr + PM8941_WLED_REG_VAL_BASE + 2 * i,
> +				wled->addr + WLED3_CTRL_REG_VAL_BASE + 2 * i,
>  				v, 2);
>  		if (rc)
>  			return rc;
>  	}
>  
>  	rc = regmap_update_bits(wled->regmap,
> -			wled->addr + PM8941_WLED_REG_SYNC,
> -			PM8941_WLED_REG_SYNC_MASK, PM8941_WLED_REG_SYNC_ALL);
> +			wled->addr + WLED3_SINK_REG_SYNC,
> +			WLED3_SINK_REG_SYNC_MASK, WLED3_SINK_REG_SYNC_ALL);
>  	if (rc)
>  		return rc;
>  
>  	rc = regmap_update_bits(wled->regmap,
> -			wled->addr + PM8941_WLED_REG_SYNC,
> -			PM8941_WLED_REG_SYNC_MASK, PM8941_WLED_REG_SYNC_CLEAR);
> +			wled->addr + WLED3_SINK_REG_SYNC,
> +			WLED3_SINK_REG_SYNC_MASK, WLED3_SINK_REG_SYNC_CLEAR);
>  	return rc;
>  }
>  
> -static int pm8941_wled_setup(struct pm8941_wled *wled)
> +static int wled_setup(struct wled *wled)
>  {
>  	int rc;
>  	int i;
>  
>  	rc = regmap_update_bits(wled->regmap,
> -			wled->addr + PM8941_WLED_REG_OVP,
> -			PM8941_WLED_REG_OVP_MASK, wled->cfg.ovp);
> +			wled->addr + WLED3_CTRL_REG_OVP,
> +			WLED3_CTRL_REG_OVP_MASK, wled->cfg.ovp);
>  	if (rc)
>  		return rc;
>  
>  	rc = regmap_update_bits(wled->regmap,
> -			wled->addr + PM8941_WLED_REG_BOOST,
> -			PM8941_WLED_REG_BOOST_MASK, wled->cfg.i_boost_limit);
> +			wled->addr + WLED3_CTRL_REG_ILIMIT,
> +			WLED3_CTRL_REG_ILIMIT_MASK, wled->cfg.boost_i_limit);
>  	if (rc)
>  		return rc;
>  
>  	rc = regmap_update_bits(wled->regmap,
> -			wled->addr + PM8941_WLED_REG_FREQ,
> -			PM8941_WLED_REG_FREQ_MASK, wled->cfg.switch_freq);
> +			wled->addr + WLED3_CTRL_REG_FREQ,
> +			WLED3_CTRL_REG_FREQ_MASK, wled->cfg.switch_freq);
>  	if (rc)
>  		return rc;
>  
>  	if (wled->cfg.cs_out_en) {
>  		u8 all = (BIT(wled->cfg.num_strings) - 1)
> -				<< PM8941_WLED_REG_SINK_SHFT;
> +				<< WLED3_SINK_REG_CURR_SINK_SHFT;
>  
>  		rc = regmap_update_bits(wled->regmap,
> -				wled->addr + PM8941_WLED_REG_SINK,
> -				PM8941_WLED_REG_SINK_MASK, all);
> +				wled->addr + WLED3_SINK_REG_CURR_SINK,
> +				WLED3_SINK_REG_CURR_SINK_MASK, all);
>  		if (rc)
>  			return rc;
>  	}
>  
>  	for (i = 0; i < wled->cfg.num_strings; ++i) {
> -		u16 addr = wled->addr + PM8941_WLED_REG_STR_OFFSET * i;
> +		u16 addr = wled->addr + WLED3_SINK_REG_STR_OFFSET * i;
>  
>  		rc = regmap_update_bits(wled->regmap,
> -				addr + PM8941_WLED_REG_STR_MOD_EN_BASE,
> -				PM8941_WLED_REG_STR_MOD_MASK,
> -				PM8941_WLED_REG_STR_MOD_EN);
> +				addr + WLED3_SINK_REG_STR_MOD_EN_BASE,
> +				WLED3_SINK_REG_STR_MOD_MASK,
> +				WLED3_SINK_REG_STR_MOD_EN);
>  		if (rc)
>  			return rc;
>  
>  		if (wled->cfg.ext_gen) {
>  			rc = regmap_update_bits(wled->regmap,
> -					addr + PM8941_WLED_REG_STR_MOD_SRC_BASE,
> -					PM8941_WLED_REG_STR_MOD_SRC_MASK,
> -					PM8941_WLED_REG_STR_MOD_SRC_EXT);
> +					addr + WLED3_SINK_REG_STR_MOD_SRC_BASE,
> +					WLED3_SINK_REG_STR_MOD_SRC_MASK,
> +					WLED3_SINK_REG_STR_MOD_SRC_EXT);
>  			if (rc)
>  				return rc;
>  		}
>  
>  		rc = regmap_update_bits(wled->regmap,
> -				addr + PM8941_WLED_REG_STR_SCALE_BASE,
> -				PM8941_WLED_REG_STR_SCALE_MASK,
> -				wled->cfg.i_limit);
> +				addr + WLED3_SINK_REG_STR_FULL_SCALE_CURR,
> +				WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK,
> +				wled->cfg.string_i_limit);
>  		if (rc)
>  			return rc;
>  
>  		rc = regmap_update_bits(wled->regmap,
> -				addr + PM8941_WLED_REG_STR_CABC_BASE,
> -				PM8941_WLED_REG_STR_CABC_MASK,
> +				addr + WLED3_SINK_REG_STR_CABC_BASE,
> +				WLED3_SINK_REG_STR_CABC_MASK,
>  				wled->cfg.cabc_en ?
> -					PM8941_WLED_REG_STR_CABC_EN : 0);
> +					WLED3_SINK_REG_STR_CABC_EN : 0);
>  		if (rc)
>  			return rc;
>  	}
> @@ -202,9 +204,9 @@ static int pm8941_wled_setup(struct pm8941_wled *wled)
>  	return 0;
>  }
>  
> -static const struct pm8941_wled_config pm8941_wled_config_defaults = {
> -	.i_boost_limit = 3,
> -	.i_limit = 20,
> +static const struct wled_config wled3_config_defaults = {
> +	.boost_i_limit = 3,
> +	.string_i_limit = 20,
>  	.ovp = 2,
>  	.switch_freq = 5,
>  	.num_strings = 0,
> @@ -213,55 +215,55 @@ static int pm8941_wled_setup(struct pm8941_wled *wled)
>  	.cabc_en = false,
>  };
>  
> -struct pm8941_wled_var_cfg {
> +struct wled_var_cfg {
>  	const u32 *values;
>  	u32 (*fn)(u32);
>  	int size;
>  };
>  
> -static const u32 pm8941_wled_i_boost_limit_values[] = {
> +static const u32 wled3_boost_i_limit_values[] = {
>  	105, 385, 525, 805, 980, 1260, 1400, 1680,
>  };
>  
> -static const struct pm8941_wled_var_cfg pm8941_wled_i_boost_limit_cfg = {
> -	.values = pm8941_wled_i_boost_limit_values,
> -	.size = ARRAY_SIZE(pm8941_wled_i_boost_limit_values),
> +static const struct wled_var_cfg wled3_boost_i_limit_cfg = {
> +	.values = wled3_boost_i_limit_values,
> +	.size = ARRAY_SIZE(wled3_boost_i_limit_values),
>  };
>  
> -static const u32 pm8941_wled_ovp_values[] = {
> +static const u32 wled3_ovp_values[] = {
>  	35, 32, 29, 27,
>  };
>  
> -static const struct pm8941_wled_var_cfg pm8941_wled_ovp_cfg = {
> -	.values = pm8941_wled_ovp_values,
> -	.size = ARRAY_SIZE(pm8941_wled_ovp_values),
> +static const struct wled_var_cfg wled3_ovp_cfg = {
> +	.values = wled3_ovp_values,
> +	.size = ARRAY_SIZE(wled3_ovp_values),
>  };
>  
> -static u32 pm8941_wled_num_strings_values_fn(u32 idx)
> +static u32 wled3_num_strings_values_fn(u32 idx)
>  {
>  	return idx + 1;
>  }
>  
> -static const struct pm8941_wled_var_cfg pm8941_wled_num_strings_cfg = {
> -	.fn = pm8941_wled_num_strings_values_fn,
> +static const struct wled_var_cfg wled3_num_strings_cfg = {
> +	.fn = wled3_num_strings_values_fn,
>  	.size = 3,
>  };
>  
> -static u32 pm8941_wled_switch_freq_values_fn(u32 idx)
> +static u32 wled3_switch_freq_values_fn(u32 idx)
>  {
>  	return 19200 / (2 * (1 + idx));
>  }
>  
> -static const struct pm8941_wled_var_cfg pm8941_wled_switch_freq_cfg = {
> -	.fn = pm8941_wled_switch_freq_values_fn,
> +static const struct wled_var_cfg wled3_switch_freq_cfg = {
> +	.fn = wled3_switch_freq_values_fn,
>  	.size = 16,
>  };
>  
> -static const struct pm8941_wled_var_cfg pm8941_wled_i_limit_cfg = {
> +static const struct wled_var_cfg wled3_string_i_limit_cfg = {
>  	.size = 26,
>  };
>  
> -static u32 pm8941_wled_values(const struct pm8941_wled_var_cfg *cfg, u32 idx)
> +static u32 wled3_values(const struct wled_var_cfg *cfg, u32 idx)
>  {
>  	if (idx >= cfg->size)
>  		return UINT_MAX;
> @@ -272,9 +274,9 @@ static u32 pm8941_wled_values(const struct pm8941_wled_var_cfg *cfg, u32 idx)
>  	return idx;
>  }
>  
> -static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev)
> +static int wled_configure(struct wled *wled, struct device *dev)
>  {
> -	struct pm8941_wled_config *cfg = &wled->cfg;
> +	struct wled_config *cfg = &wled->cfg;
>  	u32 val;
>  	int rc;
>  	u32 c;
> @@ -284,32 +286,32 @@ static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev)
>  	const struct {
>  		const char *name;
>  		u32 *val_ptr;
> -		const struct pm8941_wled_var_cfg *cfg;
> +		const struct wled_var_cfg *cfg;
>  	} u32_opts[] = {
>  		{
>  			"qcom,current-boost-limit",
> -			&cfg->i_boost_limit,
> -			.cfg = &pm8941_wled_i_boost_limit_cfg,
> +			&cfg->boost_i_limit,
> +			.cfg = &wled3_boost_i_limit_cfg,
>  		},
>  		{
>  			"qcom,current-limit",
> -			&cfg->i_limit,
> -			.cfg = &pm8941_wled_i_limit_cfg,
> +			&cfg->string_i_limit,
> +			.cfg = &wled3_string_i_limit_cfg,
>  		},
>  		{
>  			"qcom,ovp",
>  			&cfg->ovp,
> -			.cfg = &pm8941_wled_ovp_cfg,
> +			.cfg = &wled3_ovp_cfg,
>  		},
>  		{
>  			"qcom,switching-freq",
>  			&cfg->switch_freq,
> -			.cfg = &pm8941_wled_switch_freq_cfg,
> +			.cfg = &wled3_switch_freq_cfg,
>  		},
>  		{
>  			"qcom,num-strings",
>  			&cfg->num_strings,
> -			.cfg = &pm8941_wled_num_strings_cfg,
> +			.cfg = &wled3_num_strings_cfg,
>  		},
>  	};
>  	const struct {
> @@ -332,7 +334,7 @@ static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev)
>  	if (rc)
>  		wled->name = dev->of_node->name;
>  
> -	*cfg = pm8941_wled_config_defaults;
> +	*cfg = wled3_config_defaults;
>  	for (i = 0; i < ARRAY_SIZE(u32_opts); ++i) {
>  		rc = of_property_read_u32(dev->of_node, u32_opts[i].name, &val);
>  		if (rc == -EINVAL) {
> @@ -344,7 +346,7 @@ static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev)
>  
>  		c = UINT_MAX;
>  		for (j = 0; c != val; j++) {
> -			c = pm8941_wled_values(u32_opts[i].cfg, j);
> +			c = wled3_values(u32_opts[i].cfg, j);
>  			if (c == UINT_MAX) {
>  				dev_err(dev, "invalid value for '%s'\n",
>  					u32_opts[i].name);
> @@ -366,15 +368,15 @@ static int pm8941_wled_configure(struct pm8941_wled *wled, struct device *dev)
>  	return 0;
>  }
>  
> -static const struct backlight_ops pm8941_wled_ops = {
> -	.update_status = pm8941_wled_update_status,
> +static const struct backlight_ops wled_ops = {
> +	.update_status = wled_update_status,
>  };
>  
> -static int pm8941_wled_probe(struct platform_device *pdev)
> +static int wled_probe(struct platform_device *pdev)
>  {
>  	struct backlight_properties props;
>  	struct backlight_device *bl;
> -	struct pm8941_wled *wled;
> +	struct wled *wled;
>  	struct regmap *regmap;
>  	u32 val;
>  	int rc;
> @@ -391,42 +393,42 @@ static int pm8941_wled_probe(struct platform_device *pdev)
>  
>  	wled->regmap = regmap;
>  
> -	rc = pm8941_wled_configure(wled, &pdev->dev);
> +	rc = wled_configure(wled, &pdev->dev);
>  	if (rc)
>  		return rc;
>  
> -	rc = pm8941_wled_setup(wled);
> +	rc = wled_setup(wled);
>  	if (rc)
>  		return rc;
>  
> -	val = PM8941_WLED_DEFAULT_BRIGHTNESS;
> +	val = WLED_DEFAULT_BRIGHTNESS;
>  	of_property_read_u32(pdev->dev.of_node, "default-brightness", &val);
>  
>  	memset(&props, 0, sizeof(struct backlight_properties));
>  	props.type = BACKLIGHT_RAW;
>  	props.brightness = val;
> -	props.max_brightness = PM8941_WLED_REG_VAL_MAX;
> +	props.max_brightness = WLED3_SINK_REG_BRIGHT_MAX;
>  	bl = devm_backlight_device_register(&pdev->dev, wled->name,
>  					    &pdev->dev, wled,
> -					    &pm8941_wled_ops, &props);
> +					    &wled_ops, &props);
>  	return PTR_ERR_OR_ZERO(bl);
>  };
>  
> -static const struct of_device_id pm8941_wled_match_table[] = {
> +static const struct of_device_id wled_match_table[] = {
>  	{ .compatible = "qcom,pm8941-wled" },
>  	{}
>  };
> -MODULE_DEVICE_TABLE(of, pm8941_wled_match_table);
> +MODULE_DEVICE_TABLE(of, wled_match_table);
>  
> -static struct platform_driver pm8941_wled_driver = {
> -	.probe = pm8941_wled_probe,
> +static struct platform_driver wled_driver = {
> +	.probe = wled_probe,
>  	.driver	= {
> -		.name = "pm8941-wled",
> -		.of_match_table	= pm8941_wled_match_table,
> +		.name = "qcom,wled",
> +		.of_match_table	= wled_match_table,
>  	},
>  };
>  
> -module_platform_driver(pm8941_wled_driver);
> +module_platform_driver(wled_driver);
>  
> -MODULE_DESCRIPTION("pm8941 wled driver");
> +MODULE_DESCRIPTION("Qualcomm WLED driver");
>  MODULE_LICENSE("GPL v2");
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
>  a Linux Foundation Collaborative Project
> 

^ permalink raw reply	[flat|nested] 33+ messages in thread

* Re: [PATCH V4 4/8] backlight: qcom-wled: Rename PM8941* to WLED3
  2018-08-07  5:41   ` Bjorn Andersson
@ 2018-08-16  5:30     ` kgunda
  0 siblings, 0 replies; 33+ messages in thread
From: kgunda @ 2018-08-16  5:30 UTC (permalink / raw)
  To: Bjorn Andersson
  Cc: jingoohan1, lee.jones, b.zolnierkie, dri-devel, daniel.thompson,
	jacek.anaszewski, pavel, robh+dt, mark.rutland, linux-leds,
	devicetree, linux-kernel, linux-fbdev, linux-arm-msm,
	linux-arm-msm-owner

On 2018-08-07 11:11, Bjorn Andersson wrote:
> On Mon 09 Jul 03:22 PDT 2018, Kiran Gunda wrote:
> 
>> Rename the PM8941* references as WLED3 to make the
>> driver generic and have WLED support for other PMICs.
>> 
>> Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
> 
> I agree with Daniel, regarding the mentioning of the variable rename.
> 
Yes. As Daniel asked I will update the commit text.

> Apart from that:
> 
> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> 
> Regards,
> Bjorn
> 
>> ---
>> Changes from V3:
>> 	- Changed the MODULE_DESCRIPTION
>> 
>>  drivers/video/backlight/qcom-wled.c | 248 
>> ++++++++++++++++++------------------
>>  1 file changed, 125 insertions(+), 123 deletions(-)
>> 
>> diff --git a/drivers/video/backlight/qcom-wled.c 
>> b/drivers/video/backlight/qcom-wled.c
>> index 0b6d219..3cd6e75 100644
>> --- a/drivers/video/backlight/qcom-wled.c
>> +++ b/drivers/video/backlight/qcom-wled.c
>> @@ -18,77 +18,79 @@
>>  #include <linux/regmap.h>
>> 
>>  /* From DT binding */
>> -#define PM8941_WLED_DEFAULT_BRIGHTNESS		2048
>> +#define WLED_DEFAULT_BRIGHTNESS				2048
>> 
>> -#define PM8941_WLED_REG_VAL_BASE		0x40
>> -#define  PM8941_WLED_REG_VAL_MAX		0xFFF
>> +#define WLED3_SINK_REG_BRIGHT_MAX			0xFFF
>> +#define WLED3_CTRL_REG_VAL_BASE				0x40
>> 
>> -#define PM8941_WLED_REG_MOD_EN			0x46
>> -#define  PM8941_WLED_REG_MOD_EN_BIT		BIT(7)
>> -#define  PM8941_WLED_REG_MOD_EN_MASK		BIT(7)
>> +/* WLED3 control registers */
>> +#define WLED3_CTRL_REG_MOD_EN				0x46
>> +#define  WLED3_CTRL_REG_MOD_EN_BIT			BIT(7)
>> +#define  WLED3_CTRL_REG_MOD_EN_MASK			BIT(7)
>> 
>> -#define PM8941_WLED_REG_SYNC			0x47
>> -#define  PM8941_WLED_REG_SYNC_MASK		0x07
>> -#define  PM8941_WLED_REG_SYNC_LED1		BIT(0)
>> -#define  PM8941_WLED_REG_SYNC_LED2		BIT(1)
>> -#define  PM8941_WLED_REG_SYNC_LED3		BIT(2)
>> -#define  PM8941_WLED_REG_SYNC_ALL		0x07
>> -#define  PM8941_WLED_REG_SYNC_CLEAR		0x00
>> +#define WLED3_CTRL_REG_FREQ				0x4c
>> +#define  WLED3_CTRL_REG_FREQ_MASK			0x0f
>> 
>> -#define PM8941_WLED_REG_FREQ			0x4c
>> -#define  PM8941_WLED_REG_FREQ_MASK		0x0f
>> +#define WLED3_CTRL_REG_OVP				0x4d
>> +#define  WLED3_CTRL_REG_OVP_MASK			0x03
>> 
>> -#define PM8941_WLED_REG_OVP			0x4d
>> -#define  PM8941_WLED_REG_OVP_MASK		0x03
>> +#define WLED3_CTRL_REG_ILIMIT				0x4e
>> +#define  WLED3_CTRL_REG_ILIMIT_MASK			0x07
>> 
>> -#define PM8941_WLED_REG_BOOST			0x4e
>> -#define  PM8941_WLED_REG_BOOST_MASK		0x07
>> +/* WLED3 sink registers */
>> +#define WLED3_SINK_REG_SYNC				0x47
>> +#define  WLED3_SINK_REG_SYNC_MASK			0x07
>> +#define  WLED3_SINK_REG_SYNC_LED1			BIT(0)
>> +#define  WLED3_SINK_REG_SYNC_LED2			BIT(1)
>> +#define  WLED3_SINK_REG_SYNC_LED3			BIT(2)
>> +#define  WLED3_SINK_REG_SYNC_ALL			0x07
>> +#define  WLED3_SINK_REG_SYNC_CLEAR			0x00
>> 
>> -#define PM8941_WLED_REG_SINK			0x4f
>> -#define  PM8941_WLED_REG_SINK_MASK		0xe0
>> -#define  PM8941_WLED_REG_SINK_SHFT		0x05
>> +#define WLED3_SINK_REG_CURR_SINK			0x4f
>> +#define  WLED3_SINK_REG_CURR_SINK_MASK			0xe0
>> +#define  WLED3_SINK_REG_CURR_SINK_SHFT			0x05
>> 
>> -/* Per-'string' registers below */
>> -#define PM8941_WLED_REG_STR_OFFSET		0x10
>> +/* WLED3 per-'string' registers below */
>> +#define WLED3_SINK_REG_STR_OFFSET			0x10
>> 
>> -#define PM8941_WLED_REG_STR_MOD_EN_BASE		0x60
>> -#define  PM8941_WLED_REG_STR_MOD_MASK		BIT(7)
>> -#define  PM8941_WLED_REG_STR_MOD_EN		BIT(7)
>> +#define WLED3_SINK_REG_STR_MOD_EN_BASE			0x60
>> +#define  WLED3_SINK_REG_STR_MOD_MASK			BIT(7)
>> +#define  WLED3_SINK_REG_STR_MOD_EN			BIT(7)
>> 
>> -#define PM8941_WLED_REG_STR_SCALE_BASE		0x62
>> -#define  PM8941_WLED_REG_STR_SCALE_MASK		0x1f
>> +#define WLED3_SINK_REG_STR_FULL_SCALE_CURR		0x62
>> +#define  WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK	0x1f
>> 
>> -#define PM8941_WLED_REG_STR_MOD_SRC_BASE	0x63
>> -#define  PM8941_WLED_REG_STR_MOD_SRC_MASK	0x01
>> -#define  PM8941_WLED_REG_STR_MOD_SRC_INT	0x00
>> -#define  PM8941_WLED_REG_STR_MOD_SRC_EXT	0x01
>> +#define WLED3_SINK_REG_STR_MOD_SRC_BASE			0x63
>> +#define  WLED3_SINK_REG_STR_MOD_SRC_MASK		0x01
>> +#define  WLED3_SINK_REG_STR_MOD_SRC_INT			0x00
>> +#define  WLED3_SINK_REG_STR_MOD_SRC_EXT			0x01
>> 
>> -#define PM8941_WLED_REG_STR_CABC_BASE		0x66
>> -#define  PM8941_WLED_REG_STR_CABC_MASK		BIT(7)
>> -#define  PM8941_WLED_REG_STR_CABC_EN		BIT(7)
>> +#define WLED3_SINK_REG_STR_CABC_BASE			0x66
>> +#define  WLED3_SINK_REG_STR_CABC_MASK			BIT(7)
>> +#define  WLED3_SINK_REG_STR_CABC_EN			BIT(7)
>> 
>> -struct pm8941_wled_config {
>> -	u32 i_boost_limit;
>> +struct wled_config {
>> +	u32 boost_i_limit;
>>  	u32 ovp;
>>  	u32 switch_freq;
>>  	u32 num_strings;
>> -	u32 i_limit;
>> +	u32 string_i_limit;
>>  	bool cs_out_en;
>>  	bool ext_gen;
>>  	bool cabc_en;
>>  };
>> 
>> -struct pm8941_wled {
>> +struct wled {
>>  	const char *name;
>>  	struct regmap *regmap;
>>  	u16 addr;
>> 
>> -	struct pm8941_wled_config cfg;
>> +	struct wled_config cfg;
>>  };
>> 
>> -static int pm8941_wled_update_status(struct backlight_device *bl)
>> +static int wled_update_status(struct backlight_device *bl)
>>  {
>> -	struct pm8941_wled *wled = bl_get_data(bl);
>> +	struct wled *wled = bl_get_data(bl);
>>  	u16 val = bl->props.brightness;
>>  	u8 ctrl = 0;
>>  	int rc;
>> @@ -100,11 +102,11 @@ static int pm8941_wled_update_status(struct 
>> backlight_device *bl)
>>  		val = 0;
>> 
>>  	if (val != 0)
>> -		ctrl = PM8941_WLED_REG_MOD_EN_BIT;
>> +		ctrl = WLED3_CTRL_REG_MOD_EN_BIT;
>> 
>>  	rc = regmap_update_bits(wled->regmap,
>> -			wled->addr + PM8941_WLED_REG_MOD_EN,
>> -			PM8941_WLED_REG_MOD_EN_MASK, ctrl);
>> +			wled->addr + WLED3_CTRL_REG_MOD_EN,
>> +			WLED3_CTRL_REG_MOD_EN_MASK, ctrl);
>>  	if (rc)
>>  		return rc;
>> 
>> @@ -112,89 +114,89 @@ static int pm8941_wled_update_status(struct 
>> backlight_device *bl)
>>  		u8 v[2] = { val & 0xff, (val >> 8) & 0xf };
>> 
>>  		rc = regmap_bulk_write(wled->regmap,
>> -				wled->addr + PM8941_WLED_REG_VAL_BASE + 2 * i,
>> +				wled->addr + WLED3_CTRL_REG_VAL_BASE + 2 * i,
>>  				v, 2);
>>  		if (rc)
>>  			return rc;
>>  	}
>> 
>>  	rc = regmap_update_bits(wled->regmap,
>> -			wled->addr + PM8941_WLED_REG_SYNC,
>> -			PM8941_WLED_REG_SYNC_MASK, PM8941_WLED_REG_SYNC_ALL);
>> +			wled->addr + WLED3_SINK_REG_SYNC,
>> +			WLED3_SINK_REG_SYNC_MASK, WLED3_SINK_REG_SYNC_ALL);
>>  	if (rc)
>>  		return rc;
>> 
>>  	rc = regmap_update_bits(wled->regmap,
>> -			wled->addr + PM8941_WLED_REG_SYNC,
>> -			PM8941_WLED_REG_SYNC_MASK, PM8941_WLED_REG_SYNC_CLEAR);
>> +			wled->addr + WLED3_SINK_REG_SYNC,
>> +			WLED3_SINK_REG_SYNC_MASK, WLED3_SINK_REG_SYNC_CLEAR);
>>  	return rc;
>>  }
>> 
>> -static int pm8941_wled_setup(struct pm8941_wled *wled)
>> +static int wled_setup(struct wled *wled)
>>  {
>>  	int rc;
>>  	int i;
>> 
>>  	rc = regmap_update_bits(wled->regmap,
>> -			wled->addr + PM8941_WLED_REG_OVP,
>> -			PM8941_WLED_REG_OVP_MASK, wled->cfg.ovp);
>> +			wled->addr + WLED3_CTRL_REG_OVP,
>> +			WLED3_CTRL_REG_OVP_MASK, wled->cfg.ovp);
>>  	if (rc)
>>  		return rc;
>> 
>>  	rc = regmap_update_bits(wled->regmap,
>> -			wled->addr + PM8941_WLED_REG_BOOST,
>> -			PM8941_WLED_REG_BOOST_MASK, wled->cfg.i_boost_limit);
>> +			wled->addr + WLED3_CTRL_REG_ILIMIT,
>> +			WLED3_CTRL_REG_ILIMIT_MASK, wled->cfg.boost_i_limit);
>>  	if (rc)
>>  		return rc;
>> 
>>  	rc = regmap_update_bits(wled->regmap,
>> -			wled->addr + PM8941_WLED_REG_FREQ,
>> -			PM8941_WLED_REG_FREQ_MASK, wled->cfg.switch_freq);
>> +			wled->addr + WLED3_CTRL_REG_FREQ,
>> +			WLED3_CTRL_REG_FREQ_MASK, wled->cfg.switch_freq);
>>  	if (rc)
>>  		return rc;
>> 
>>  	if (wled->cfg.cs_out_en) {
>>  		u8 all = (BIT(wled->cfg.num_strings) - 1)
>> -				<< PM8941_WLED_REG_SINK_SHFT;
>> +				<< WLED3_SINK_REG_CURR_SINK_SHFT;
>> 
>>  		rc = regmap_update_bits(wled->regmap,
>> -				wled->addr + PM8941_WLED_REG_SINK,
>> -				PM8941_WLED_REG_SINK_MASK, all);
>> +				wled->addr + WLED3_SINK_REG_CURR_SINK,
>> +				WLED3_SINK_REG_CURR_SINK_MASK, all);
>>  		if (rc)
>>  			return rc;
>>  	}
>> 
>>  	for (i = 0; i < wled->cfg.num_strings; ++i) {
>> -		u16 addr = wled->addr + PM8941_WLED_REG_STR_OFFSET * i;
>> +		u16 addr = wled->addr + WLED3_SINK_REG_STR_OFFSET * i;
>> 
>>  		rc = regmap_update_bits(wled->regmap,
>> -				addr + PM8941_WLED_REG_STR_MOD_EN_BASE,
>> -				PM8941_WLED_REG_STR_MOD_MASK,
>> -				PM8941_WLED_REG_STR_MOD_EN);
>> +				addr + WLED3_SINK_REG_STR_MOD_EN_BASE,
>> +				WLED3_SINK_REG_STR_MOD_MASK,
>> +				WLED3_SINK_REG_STR_MOD_EN);
>>  		if (rc)
>>  			return rc;
>> 
>>  		if (wled->cfg.ext_gen) {
>>  			rc = regmap_update_bits(wled->regmap,
>> -					addr + PM8941_WLED_REG_STR_MOD_SRC_BASE,
>> -					PM8941_WLED_REG_STR_MOD_SRC_MASK,
>> -					PM8941_WLED_REG_STR_MOD_SRC_EXT);
>> +					addr + WLED3_SINK_REG_STR_MOD_SRC_BASE,
>> +					WLED3_SINK_REG_STR_MOD_SRC_MASK,
>> +					WLED3_SINK_REG_STR_MOD_SRC_EXT);
>>  			if (rc)
>>  				return rc;
>>  		}
>> 
>>  		rc = regmap_update_bits(wled->regmap,
>> -				addr + PM8941_WLED_REG_STR_SCALE_BASE,
>> -				PM8941_WLED_REG_STR_SCALE_MASK,
>> -				wled->cfg.i_limit);
>> +				addr + WLED3_SINK_REG_STR_FULL_SCALE_CURR,
>> +				WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK,
>> +				wled->cfg.string_i_limit);
>>  		if (rc)
>>  			return rc;
>> 
>>  		rc = regmap_update_bits(wled->regmap,
>> -				addr + PM8941_WLED_REG_STR_CABC_BASE,
>> -				PM8941_WLED_REG_STR_CABC_MASK,
>> +				addr + WLED3_SINK_REG_STR_CABC_BASE,
>> +				WLED3_SINK_REG_STR_CABC_MASK,
>>  				wled->cfg.cabc_en ?
>> -					PM8941_WLED_REG_STR_CABC_EN : 0);
>> +					WLED3_SINK_REG_STR_CABC_EN : 0);
>>  		if (rc)
>>  			return rc;
>>  	}
>> @@ -202,9 +204,9 @@ static int pm8941_wled_setup(struct pm8941_wled 
>> *wled)
>>  	return 0;
>>  }
>> 
>> -static const struct pm8941_wled_config pm8941_wled_config_defaults = 
>> {
>> -	.i_boost_limit = 3,
>> -	.i_limit = 20,
>> +static const struct wled_config wled3_config_defaults = {
>> +	.boost_i_limit = 3,
>> +	.string_i_limit = 20,
>>  	.ovp = 2,
>>  	.switch_freq = 5,
>>  	.num_strings = 0,
>> @@ -213,55 +215,55 @@ static int pm8941_wled_setup(struct pm8941_wled 
>> *wled)
>>  	.cabc_en = false,
>>  };
>> 
>> -struct pm8941_wled_var_cfg {
>> +struct wled_var_cfg {
>>  	const u32 *values;
>>  	u32 (*fn)(u32);
>>  	int size;
>>  };
>> 
>> -static const u32 pm8941_wled_i_boost_limit_values[] = {
>> +static const u32 wled3_boost_i_limit_values[] = {
>>  	105, 385, 525, 805, 980, 1260, 1400, 1680,
>>  };
>> 
>> -static const struct pm8941_wled_var_cfg pm8941_wled_i_boost_limit_cfg 
>> = {
>> -	.values = pm8941_wled_i_boost_limit_values,
>> -	.size = ARRAY_SIZE(pm8941_wled_i_boost_limit_values),
>> +static const struct wled_var_cfg wled3_boost_i_limit_cfg = {
>> +	.values = wled3_boost_i_limit_values,
>> +	.size = ARRAY_SIZE(wled3_boost_i_limit_values),
>>  };
>> 
>> -static const u32 pm8941_wled_ovp_values[] = {
>> +static const u32 wled3_ovp_values[] = {
>>  	35, 32, 29, 27,
>>  };
>> 
>> -static const struct pm8941_wled_var_cfg pm8941_wled_ovp_cfg = {
>> -	.values = pm8941_wled_ovp_values,
>> -	.size = ARRAY_SIZE(pm8941_wled_ovp_values),
>> +static const struct wled_var_cfg wled3_ovp_cfg = {
>> +	.values = wled3_ovp_values,
>> +	.size = ARRAY_SIZE(wled3_ovp_values),
>>  };
>> 
>> -static u32 pm8941_wled_num_strings_values_fn(u32 idx)
>> +static u32 wled3_num_strings_values_fn(u32 idx)
>>  {
>>  	return idx + 1;
>>  }
>> 
>> -static const struct pm8941_wled_var_cfg pm8941_wled_num_strings_cfg = 
>> {
>> -	.fn = pm8941_wled_num_strings_values_fn,
>> +static const struct wled_var_cfg wled3_num_strings_cfg = {
>> +	.fn = wled3_num_strings_values_fn,
>>  	.size = 3,
>>  };
>> 
>> -static u32 pm8941_wled_switch_freq_values_fn(u32 idx)
>> +static u32 wled3_switch_freq_values_fn(u32 idx)
>>  {
>>  	return 19200 / (2 * (1 + idx));
>>  }
>> 
>> -static const struct pm8941_wled_var_cfg pm8941_wled_switch_freq_cfg = 
>> {
>> -	.fn = pm8941_wled_switch_freq_values_fn,
>> +static const struct wled_var_cfg wled3_switch_freq_cfg = {
>> +	.fn = wled3_switch_freq_values_fn,
>>  	.size = 16,
>>  };
>> 
>> -static const struct pm8941_wled_var_cfg pm8941_wled_i_limit_cfg = {
>> +static const struct wled_var_cfg wled3_string_i_limit_cfg = {
>>  	.size = 26,
>>  };
>> 
>> -static u32 pm8941_wled_values(const struct pm8941_wled_var_cfg *cfg, 
>> u32 idx)
>> +static u32 wled3_values(const struct wled_var_cfg *cfg, u32 idx)
>>  {
>>  	if (idx >= cfg->size)
>>  		return UINT_MAX;
>> @@ -272,9 +274,9 @@ static u32 pm8941_wled_values(const struct 
>> pm8941_wled_var_cfg *cfg, u32 idx)
>>  	return idx;
>>  }
>> 
>> -static int pm8941_wled_configure(struct pm8941_wled *wled, struct 
>> device *dev)
>> +static int wled_configure(struct wled *wled, struct device *dev)
>>  {
>> -	struct pm8941_wled_config *cfg = &wled->cfg;
>> +	struct wled_config *cfg = &wled->cfg;
>>  	u32 val;
>>  	int rc;
>>  	u32 c;
>> @@ -284,32 +286,32 @@ static int pm8941_wled_configure(struct 
>> pm8941_wled *wled, struct device *dev)
>>  	const struct {
>>  		const char *name;
>>  		u32 *val_ptr;
>> -		const struct pm8941_wled_var_cfg *cfg;
>> +		const struct wled_var_cfg *cfg;
>>  	} u32_opts[] = {
>>  		{
>>  			"qcom,current-boost-limit",
>> -			&cfg->i_boost_limit,
>> -			.cfg = &pm8941_wled_i_boost_limit_cfg,
>> +			&cfg->boost_i_limit,
>> +			.cfg = &wled3_boost_i_limit_cfg,
>>  		},
>>  		{
>>  			"qcom,current-limit",
>> -			&cfg->i_limit,
>> -			.cfg = &pm8941_wled_i_limit_cfg,
>> +			&cfg->string_i_limit,
>> +			.cfg = &wled3_string_i_limit_cfg,
>>  		},
>>  		{
>>  			"qcom,ovp",
>>  			&cfg->ovp,
>> -			.cfg = &pm8941_wled_ovp_cfg,
>> +			.cfg = &wled3_ovp_cfg,
>>  		},
>>  		{
>>  			"qcom,switching-freq",
>>  			&cfg->switch_freq,
>> -			.cfg = &pm8941_wled_switch_freq_cfg,
>> +			.cfg = &wled3_switch_freq_cfg,
>>  		},
>>  		{
>>  			"qcom,num-strings",
>>  			&cfg->num_strings,
>> -			.cfg = &pm8941_wled_num_strings_cfg,
>> +			.cfg = &wled3_num_strings_cfg,
>>  		},
>>  	};
>>  	const struct {
>> @@ -332,7 +334,7 @@ static int pm8941_wled_configure(struct 
>> pm8941_wled *wled, struct device *dev)
>>  	if (rc)
>>  		wled->name = dev->of_node->name;
>> 
>> -	*cfg = pm8941_wled_config_defaults;
>> +	*cfg = wled3_config_defaults;
>>  	for (i = 0; i < ARRAY_SIZE(u32_opts); ++i) {
>>  		rc = of_property_read_u32(dev->of_node, u32_opts[i].name, &val);
>>  		if (rc == -EINVAL) {
>> @@ -344,7 +346,7 @@ static int pm8941_wled_configure(struct 
>> pm8941_wled *wled, struct device *dev)
>> 
>>  		c = UINT_MAX;
>>  		for (j = 0; c != val; j++) {
>> -			c = pm8941_wled_values(u32_opts[i].cfg, j);
>> +			c = wled3_values(u32_opts[i].cfg, j);
>>  			if (c == UINT_MAX) {
>>  				dev_err(dev, "invalid value for '%s'\n",
>>  					u32_opts[i].name);
>> @@ -366,15 +368,15 @@ static int pm8941_wled_configure(struct 
>> pm8941_wled *wled, struct device *dev)
>>  	return 0;
>>  }
>> 
>> -static const struct backlight_ops pm8941_wled_ops = {
>> -	.update_status = pm8941_wled_update_status,
>> +static const struct backlight_ops wled_ops = {
>> +	.update_status = wled_update_status,
>>  };
>> 
>> -static int pm8941_wled_probe(struct platform_device *pdev)
>> +static int wled_probe(struct platform_device *pdev)
>>  {
>>  	struct backlight_properties props;
>>  	struct backlight_device *bl;
>> -	struct pm8941_wled *wled;
>> +	struct wled *wled;
>>  	struct regmap *regmap;
>>  	u32 val;
>>  	int rc;
>> @@ -391,42 +393,42 @@ static int pm8941_wled_probe(struct 
>> platform_device *pdev)
>> 
>>  	wled->regmap = regmap;
>> 
>> -	rc = pm8941_wled_configure(wled, &pdev->dev);
>> +	rc = wled_configure(wled, &pdev->dev);
>>  	if (rc)
>>  		return rc;
>> 
>> -	rc = pm8941_wled_setup(wled);
>> +	rc = wled_setup(wled);
>>  	if (rc)
>>  		return rc;
>> 
>> -	val = PM8941_WLED_DEFAULT_BRIGHTNESS;
>> +	val = WLED_DEFAULT_BRIGHTNESS;
>>  	of_property_read_u32(pdev->dev.of_node, "default-brightness", &val);
>> 
>>  	memset(&props, 0, sizeof(struct backlight_properties));
>>  	props.type = BACKLIGHT_RAW;
>>  	props.brightness = val;
>> -	props.max_brightness = PM8941_WLED_REG_VAL_MAX;
>> +	props.max_brightness = WLED3_SINK_REG_BRIGHT_MAX;
>>  	bl = devm_backlight_device_register(&pdev->dev, wled->name,
>>  					    &pdev->dev, wled,
>> -					    &pm8941_wled_ops, &props);
>> +					    &wled_ops, &props);
>>  	return PTR_ERR_OR_ZERO(bl);
>>  };
>> 
>> -static const struct of_device_id pm8941_wled_match_table[] = {
>> +static const struct of_device_id wled_match_table[] = {
>>  	{ .compatible = "qcom,pm8941-wled" },
>>  	{}
>>  };
>> -MODULE_DEVICE_TABLE(of, pm8941_wled_match_table);
>> +MODULE_DEVICE_TABLE(of, wled_match_table);
>> 
>> -static struct platform_driver pm8941_wled_driver = {
>> -	.probe = pm8941_wled_probe,
>> +static struct platform_driver wled_driver = {
>> +	.probe = wled_probe,
>>  	.driver	= {
>> -		.name = "pm8941-wled",
>> -		.of_match_table	= pm8941_wled_match_table,
>> +		.name = "qcom,wled",
>> +		.of_match_table	= wled_match_table,
>>  	},
>>  };
>> 
>> -module_platform_driver(pm8941_wled_driver);
>> +module_platform_driver(wled_driver);
>> 
>> -MODULE_DESCRIPTION("pm8941 wled driver");
>> +MODULE_DESCRIPTION("Qualcomm WLED driver");
>>  MODULE_LICENSE("GPL v2");
>> --
>> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora 
>> Forum,
>>  a Linux Foundation Collaborative Project
>> 
> --
> To unsubscribe from this list: send the line "unsubscribe 
> linux-arm-msm" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

^ permalink raw reply	[flat|nested] 33+ messages in thread

* [PATCH V4 5/8] backlight: qcom-wled: Restructure the driver for WLED3
  2018-07-09 10:22 [PATCH V4 0/8] backlight: qcom-wled: Support for QCOM wled driver Kiran Gunda
                   ` (3 preceding siblings ...)
  2018-07-09 10:22 ` [PATCH V4 4/8] backlight: qcom-wled: Rename PM8941* to WLED3 Kiran Gunda
@ 2018-07-09 10:22 ` Kiran Gunda
  2018-07-20 13:40   ` Daniel Thompson
  2018-08-07  5:37   ` Bjorn Andersson
  2018-07-09 10:22 ` [PATCH V4 6/8] backlight: qcom-wled: Add support for WLED4 peripheral Kiran Gunda
                   ` (3 subsequent siblings)
  8 siblings, 2 replies; 33+ messages in thread
From: Kiran Gunda @ 2018-07-09 10:22 UTC (permalink / raw)
  To: bjorn.andersson, jingoohan1, lee.jones, b.zolnierkie, dri-devel,
	daniel.thompson, jacek.anaszewski, pavel, robh+dt, mark.rutland,
	linux-leds, devicetree, linux-kernel, linux-fbdev
  Cc: linux-arm-msm, Kiran Gunda

Restructure the driver to add the support for new WLED
peripherals.

Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
---
Changes from V3:
	- This is the new patch after splitting the 
	  "backlight: qcom-wled: Add support for WLED4 peripheral" patch
	  to seperate the WLED3 specific restructure.
		
 drivers/video/backlight/qcom-wled.c | 396 ++++++++++++++++++++++--------------
 1 file changed, 246 insertions(+), 150 deletions(-)

diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
index 3cd6e75..87fc1d0 100644
--- a/drivers/video/backlight/qcom-wled.c
+++ b/drivers/video/backlight/qcom-wled.c
@@ -15,59 +15,71 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/of_address.h>
 #include <linux/regmap.h>
 
 /* From DT binding */
+#define WLED_MAX_STRINGS				4
+
 #define WLED_DEFAULT_BRIGHTNESS				2048
 
-#define WLED3_SINK_REG_BRIGHT_MAX			0xFFF
-#define WLED3_CTRL_REG_VAL_BASE				0x40
+#define WLED_SINK_REG_BRIGHT_MAX			0xFFF
 
-/* WLED3 control registers */
-#define WLED3_CTRL_REG_MOD_EN				0x46
-#define  WLED3_CTRL_REG_MOD_EN_BIT			BIT(7)
-#define  WLED3_CTRL_REG_MOD_EN_MASK			BIT(7)
+/* WLED control registers */
+#define WLED_CTRL_REG_MOD_EN				0x46
+#define  WLED_CTRL_REG_MOD_EN_MASK			BIT(7)
+#define  WLED_CTRL_REG_MOD_EN_SHIFT			7
 
-#define WLED3_CTRL_REG_FREQ				0x4c
-#define  WLED3_CTRL_REG_FREQ_MASK			0x0f
+#define WLED_CTRL_REG_FREQ				0x4c
+#define  WLED_CTRL_REG_FREQ_MASK			GENMASK(3, 0)
 
-#define WLED3_CTRL_REG_OVP				0x4d
-#define  WLED3_CTRL_REG_OVP_MASK			0x03
+#define WLED_CTRL_REG_OVP				0x4d
+#define  WLED_CTRL_REG_OVP_MASK				GENMASK(1, 0)
 
-#define WLED3_CTRL_REG_ILIMIT				0x4e
-#define  WLED3_CTRL_REG_ILIMIT_MASK			0x07
+#define WLED_CTRL_REG_ILIMIT				0x4e
+#define  WLED_CTRL_REG_ILIMIT_MASK			GENMASK(2, 0)
 
-/* WLED3 sink registers */
-#define WLED3_SINK_REG_SYNC				0x47
-#define  WLED3_SINK_REG_SYNC_MASK			0x07
-#define  WLED3_SINK_REG_SYNC_LED1			BIT(0)
-#define  WLED3_SINK_REG_SYNC_LED2			BIT(1)
-#define  WLED3_SINK_REG_SYNC_LED3			BIT(2)
-#define  WLED3_SINK_REG_SYNC_ALL			0x07
-#define  WLED3_SINK_REG_SYNC_CLEAR			0x00
+/* WLED sink registers */
+#define WLED_SINK_REG_SYNC				0x47
+#define  WLED_SINK_REG_SYNC_CLEAR			0x00
 
 #define WLED3_SINK_REG_CURR_SINK			0x4f
-#define  WLED3_SINK_REG_CURR_SINK_MASK			0xe0
-#define  WLED3_SINK_REG_CURR_SINK_SHFT			0x05
+#define  WLED3_SINK_REG_CURR_SINK_MASK			GENMASK(7, 5)
+#define  WLED3_SINK_REG_CURR_SINK_SHFT			5
 
-/* WLED3 per-'string' registers below */
-#define WLED3_SINK_REG_STR_OFFSET			0x10
+/* WLED3 specific per-'string' registers below */
+#define WLED3_SINK_REG_BRIGHT(n)			(0x40 + n)
 
-#define WLED3_SINK_REG_STR_MOD_EN_BASE			0x60
+#define WLED3_SINK_REG_STR_MOD_EN(n)			(0x60 + (n * 0x10))
 #define  WLED3_SINK_REG_STR_MOD_MASK			BIT(7)
-#define  WLED3_SINK_REG_STR_MOD_EN			BIT(7)
 
-#define WLED3_SINK_REG_STR_FULL_SCALE_CURR		0x62
-#define  WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK	0x1f
+#define WLED3_SINK_REG_STR_FULL_SCALE_CURR(n)		(0x62 + (n * 0x10))
+#define  WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK	GENMASK(4, 0)
 
-#define WLED3_SINK_REG_STR_MOD_SRC_BASE			0x63
-#define  WLED3_SINK_REG_STR_MOD_SRC_MASK		0x01
+#define WLED3_SINK_REG_STR_MOD_SRC(n)			(0x63 + (n * 0x10))
+#define  WLED3_SINK_REG_STR_MOD_SRC_MASK		BIT(0)
 #define  WLED3_SINK_REG_STR_MOD_SRC_INT			0x00
 #define  WLED3_SINK_REG_STR_MOD_SRC_EXT			0x01
 
-#define WLED3_SINK_REG_STR_CABC_BASE			0x66
+#define WLED3_SINK_REG_STR_CABC(n)			(0x66 + (n * 0x10))
 #define  WLED3_SINK_REG_STR_CABC_MASK			BIT(7)
-#define  WLED3_SINK_REG_STR_CABC_EN			BIT(7)
+
+struct wled_var_cfg {
+	const u32 *values;
+	u32 (*fn)(u32);
+	int size;
+};
+
+struct wled_u32_opts {
+	const char *name;
+	u32 *val_ptr;
+	const struct wled_var_cfg *cfg;
+};
+
+struct wled_bool_opts {
+	const char *name;
+	bool *val_ptr;
+};
 
 struct wled_config {
 	u32 boost_i_limit;
@@ -75,132 +87,179 @@ struct wled_config {
 	u32 switch_freq;
 	u32 num_strings;
 	u32 string_i_limit;
+	u32 enabled_strings[WLED_MAX_STRINGS];
 	bool cs_out_en;
 	bool ext_gen;
-	bool cabc_en;
+	bool cabc;
 };
 
 struct wled {
 	const char *name;
+	struct device *dev;
 	struct regmap *regmap;
-	u16 addr;
+	u16 ctrl_addr;
+	u16 max_string_count;
+	u32 brightness;
+	u32 max_brightness;
 
 	struct wled_config cfg;
+	int (*wled_set_brightness)(struct wled *wled, u16 brightness);
 };
 
+static int wled3_set_brightness(struct wled *wled, u16 brightness)
+{
+	int rc, i;
+	u8 v[2];
+
+	v[0] = brightness & 0xff;
+	v[1] = (brightness >> 8) & 0xf;
+
+	for (i = 0;  i < wled->cfg.num_strings; ++i) {
+		rc = regmap_bulk_write(wled->regmap, wled->ctrl_addr +
+				       WLED3_SINK_REG_BRIGHT(i), v, 2);
+		if (rc < 0)
+			return rc;
+	}
+
+	return 0;
+}
+
+static int wled_module_enable(struct wled *wled, int val)
+{
+	int rc;
+
+	rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
+				WLED_CTRL_REG_MOD_EN,
+				WLED_CTRL_REG_MOD_EN_MASK,
+				val << WLED_CTRL_REG_MOD_EN_SHIFT);
+	return rc;
+}
+
+static int wled_sync_toggle(struct wled *wled)
+{
+	int rc;
+	unsigned int mask = GENMASK(wled->max_string_count - 1, 0);
+
+	rc = regmap_update_bits(wled->regmap,
+				wled->ctrl_addr + WLED_SINK_REG_SYNC,
+				mask, mask);
+	if (rc < 0)
+		return rc;
+
+	rc = regmap_update_bits(wled->regmap,
+				wled->ctrl_addr + WLED_SINK_REG_SYNC,
+				mask, WLED_SINK_REG_SYNC_CLEAR);
+
+	return rc;
+}
+
 static int wled_update_status(struct backlight_device *bl)
 {
 	struct wled *wled = bl_get_data(bl);
-	u16 val = bl->props.brightness;
-	u8 ctrl = 0;
-	int rc;
-	int i;
+	u16 brightness = bl->props.brightness;
+	int rc = 0;
 
 	if (bl->props.power != FB_BLANK_UNBLANK ||
 	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
 	    bl->props.state & BL_CORE_FBBLANK)
-		val = 0;
-
-	if (val != 0)
-		ctrl = WLED3_CTRL_REG_MOD_EN_BIT;
+		brightness = 0;
 
-	rc = regmap_update_bits(wled->regmap,
-			wled->addr + WLED3_CTRL_REG_MOD_EN,
-			WLED3_CTRL_REG_MOD_EN_MASK, ctrl);
-	if (rc)
-		return rc;
+	if (brightness) {
+		rc = wled->wled_set_brightness(wled, brightness);
+		if (rc < 0) {
+			dev_err(wled->dev, "wled failed to set brightness rc:%d\n",
+				rc);
+			return rc;
+		}
 
-	for (i = 0; i < wled->cfg.num_strings; ++i) {
-		u8 v[2] = { val & 0xff, (val >> 8) & 0xf };
+		rc = wled_sync_toggle(wled);
+		if (rc < 0) {
+			dev_err(wled->dev, "wled sync failed rc:%d\n", rc);
+			return rc;
+		}
+	}
 
-		rc = regmap_bulk_write(wled->regmap,
-				wled->addr + WLED3_CTRL_REG_VAL_BASE + 2 * i,
-				v, 2);
-		if (rc)
+	if (!!brightness != !!wled->brightness) {
+		rc = wled_module_enable(wled, !!brightness);
+		if (rc < 0) {
+			dev_err(wled->dev, "wled enable failed rc:%d\n", rc);
 			return rc;
+		}
 	}
 
-	rc = regmap_update_bits(wled->regmap,
-			wled->addr + WLED3_SINK_REG_SYNC,
-			WLED3_SINK_REG_SYNC_MASK, WLED3_SINK_REG_SYNC_ALL);
-	if (rc)
-		return rc;
+	wled->brightness = brightness;
 
-	rc = regmap_update_bits(wled->regmap,
-			wled->addr + WLED3_SINK_REG_SYNC,
-			WLED3_SINK_REG_SYNC_MASK, WLED3_SINK_REG_SYNC_CLEAR);
 	return rc;
 }
 
-static int wled_setup(struct wled *wled)
+static int wled3_setup(struct wled *wled)
 {
-	int rc;
-	int i;
+	u16 addr;
+	u8 sink_en = 0;
+	int rc, i, j;
 
 	rc = regmap_update_bits(wled->regmap,
-			wled->addr + WLED3_CTRL_REG_OVP,
-			WLED3_CTRL_REG_OVP_MASK, wled->cfg.ovp);
+				wled->ctrl_addr + WLED_CTRL_REG_OVP,
+				WLED_CTRL_REG_OVP_MASK, wled->cfg.ovp);
 	if (rc)
 		return rc;
 
 	rc = regmap_update_bits(wled->regmap,
-			wled->addr + WLED3_CTRL_REG_ILIMIT,
-			WLED3_CTRL_REG_ILIMIT_MASK, wled->cfg.boost_i_limit);
+				wled->ctrl_addr + WLED_CTRL_REG_ILIMIT,
+				WLED_CTRL_REG_ILIMIT_MASK,
+				wled->cfg.boost_i_limit);
 	if (rc)
 		return rc;
 
 	rc = regmap_update_bits(wled->regmap,
-			wled->addr + WLED3_CTRL_REG_FREQ,
-			WLED3_CTRL_REG_FREQ_MASK, wled->cfg.switch_freq);
+				wled->ctrl_addr + WLED_CTRL_REG_FREQ,
+				WLED_CTRL_REG_FREQ_MASK,
+				wled->cfg.switch_freq);
 	if (rc)
 		return rc;
 
-	if (wled->cfg.cs_out_en) {
-		u8 all = (BIT(wled->cfg.num_strings) - 1)
-				<< WLED3_SINK_REG_CURR_SINK_SHFT;
-
-		rc = regmap_update_bits(wled->regmap,
-				wled->addr + WLED3_SINK_REG_CURR_SINK,
-				WLED3_SINK_REG_CURR_SINK_MASK, all);
-		if (rc)
-			return rc;
-	}
-
 	for (i = 0; i < wled->cfg.num_strings; ++i) {
-		u16 addr = wled->addr + WLED3_SINK_REG_STR_OFFSET * i;
-
-		rc = regmap_update_bits(wled->regmap,
-				addr + WLED3_SINK_REG_STR_MOD_EN_BASE,
-				WLED3_SINK_REG_STR_MOD_MASK,
-				WLED3_SINK_REG_STR_MOD_EN);
+		j = wled->cfg.enabled_strings[i];
+		addr = wled->ctrl_addr + WLED3_SINK_REG_STR_MOD_EN(j);
+		rc = regmap_update_bits(wled->regmap, addr,
+					WLED3_SINK_REG_STR_MOD_MASK,
+					WLED3_SINK_REG_STR_MOD_MASK);
 		if (rc)
 			return rc;
 
 		if (wled->cfg.ext_gen) {
-			rc = regmap_update_bits(wled->regmap,
-					addr + WLED3_SINK_REG_STR_MOD_SRC_BASE,
-					WLED3_SINK_REG_STR_MOD_SRC_MASK,
-					WLED3_SINK_REG_STR_MOD_SRC_EXT);
+			addr = wled->ctrl_addr + WLED3_SINK_REG_STR_MOD_SRC(j);
+			rc = regmap_update_bits(wled->regmap, addr,
+						WLED3_SINK_REG_STR_MOD_SRC_MASK,
+						WLED3_SINK_REG_STR_MOD_SRC_EXT);
 			if (rc)
 				return rc;
 		}
 
-		rc = regmap_update_bits(wled->regmap,
-				addr + WLED3_SINK_REG_STR_FULL_SCALE_CURR,
-				WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK,
-				wled->cfg.string_i_limit);
+		addr = wled->ctrl_addr + WLED3_SINK_REG_STR_FULL_SCALE_CURR(j);
+		rc = regmap_update_bits(wled->regmap, addr,
+					WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK,
+					wled->cfg.string_i_limit);
 		if (rc)
 			return rc;
 
-		rc = regmap_update_bits(wled->regmap,
-				addr + WLED3_SINK_REG_STR_CABC_BASE,
-				WLED3_SINK_REG_STR_CABC_MASK,
-				wled->cfg.cabc_en ?
-					WLED3_SINK_REG_STR_CABC_EN : 0);
+		addr = wled->ctrl_addr + WLED3_SINK_REG_STR_CABC(j);
+		rc = regmap_update_bits(wled->regmap, addr,
+					WLED3_SINK_REG_STR_CABC_MASK,
+					wled->cfg.cabc ?
+					WLED3_SINK_REG_STR_CABC_MASK : 0);
 		if (rc)
 			return rc;
+
+		sink_en |= BIT(j + WLED3_SINK_REG_CURR_SINK_SHFT);
 	}
 
+	rc = regmap_update_bits(wled->regmap,
+				wled->ctrl_addr + WLED3_SINK_REG_CURR_SINK,
+				WLED3_SINK_REG_CURR_SINK_MASK, sink_en);
+	if (rc)
+		return rc;
+
 	return 0;
 }
 
@@ -208,17 +267,11 @@ static int wled_setup(struct wled *wled)
 	.boost_i_limit = 3,
 	.string_i_limit = 20,
 	.ovp = 2,
+	.num_strings = 3,
 	.switch_freq = 5,
-	.num_strings = 0,
 	.cs_out_en = false,
 	.ext_gen = false,
-	.cabc_en = false,
-};
-
-struct wled_var_cfg {
-	const u32 *values;
-	u32 (*fn)(u32);
-	int size;
+	.cabc = false,
 };
 
 static const u32 wled3_boost_i_limit_values[] = {
@@ -263,7 +316,11 @@ static u32 wled3_switch_freq_values_fn(u32 idx)
 	.size = 26,
 };
 
-static u32 wled3_values(const struct wled_var_cfg *cfg, u32 idx)
+static const struct wled_var_cfg wled3_string_cfg = {
+	.size = 8,
+};
+
+static u32 wled_values(const struct wled_var_cfg *cfg, u32 idx)
 {
 	if (idx >= cfg->size)
 		return UINT_MAX;
@@ -274,68 +331,77 @@ static u32 wled3_values(const struct wled_var_cfg *cfg, u32 idx)
 	return idx;
 }
 
-static int wled_configure(struct wled *wled, struct device *dev)
+#define	WLED3	3
+
+static int wled_configure(struct wled *wled, int version)
 {
 	struct wled_config *cfg = &wled->cfg;
-	u32 val;
-	int rc;
-	u32 c;
-	int i;
-	int j;
-
-	const struct {
-		const char *name;
-		u32 *val_ptr;
-		const struct wled_var_cfg *cfg;
-	} u32_opts[] = {
+	struct device *dev = wled->dev;
+	const __be32 *prop_addr;
+	u32 size, val, c, string_len;
+	int rc, i, j;
+
+	const struct wled_u32_opts *u32_opts = NULL;
+	const struct wled_u32_opts wled3_opts[] = {
 		{
-			"qcom,current-boost-limit",
-			&cfg->boost_i_limit,
+			.name = "qcom,current-boost-limit",
+			.val_ptr = &cfg->boost_i_limit,
 			.cfg = &wled3_boost_i_limit_cfg,
 		},
 		{
-			"qcom,current-limit",
-			&cfg->string_i_limit,
+			.name = "qcom,current-limit",
+			.val_ptr = &cfg->string_i_limit,
 			.cfg = &wled3_string_i_limit_cfg,
 		},
 		{
-			"qcom,ovp",
-			&cfg->ovp,
+			.name = "qcom,ovp",
+			.val_ptr = &cfg->ovp,
 			.cfg = &wled3_ovp_cfg,
 		},
 		{
-			"qcom,switching-freq",
-			&cfg->switch_freq,
+			.name = "qcom,switching-freq",
+			.val_ptr = &cfg->switch_freq,
 			.cfg = &wled3_switch_freq_cfg,
 		},
 		{
-			"qcom,num-strings",
-			&cfg->num_strings,
+			.name = "qcom,num-strings",
+			.val_ptr = &cfg->num_strings,
 			.cfg = &wled3_num_strings_cfg,
 		},
 	};
-	const struct {
-		const char *name;
-		bool *val_ptr;
-	} bool_opts[] = {
+
+	const struct wled_bool_opts bool_opts[] = {
 		{ "qcom,cs-out", &cfg->cs_out_en, },
 		{ "qcom,ext-gen", &cfg->ext_gen, },
-		{ "qcom,cabc", &cfg->cabc_en, },
+		{ "qcom,cabc", &cfg->cabc, },
 	};
 
-	rc = of_property_read_u32(dev->of_node, "reg", &val);
-	if (rc || val > 0xffff) {
-		dev_err(dev, "invalid IO resources\n");
-		return rc ? rc : -EINVAL;
+	prop_addr = of_get_address(dev->of_node, 0, NULL, NULL);
+	if (!prop_addr) {
+		dev_err(wled->dev, "invalid IO resources\n");
+		return -EINVAL;
 	}
-	wled->addr = val;
+	wled->ctrl_addr = be32_to_cpu(*prop_addr);
 
 	rc = of_property_read_string(dev->of_node, "label", &wled->name);
 	if (rc)
 		wled->name = dev->of_node->name;
 
-	*cfg = wled3_config_defaults;
-	for (i = 0; i < ARRAY_SIZE(u32_opts); ++i) {
+	switch (version) {
+	case WLED3:
+		u32_opts = wled3_opts;
+		size = ARRAY_SIZE(wled3_opts);
+		*cfg = wled3_config_defaults;
+		wled->wled_set_brightness = wled3_set_brightness;
+		wled->max_string_count = 3;
+		break;
+
+	default:
+		dev_err(wled->dev, "Invalid WLED version\n");
+		break;
+	}
+
+	for (i = 0; i < size; ++i) {
 		rc = of_property_read_u32(dev->of_node, u32_opts[i].name, &val);
 		if (rc == -EINVAL) {
 			continue;
@@ -346,12 +412,15 @@ static int wled_configure(struct wled *wled, struct device *dev)
 
 		c = UINT_MAX;
 		for (j = 0; c != val; j++) {
-			c = wled3_values(u32_opts[i].cfg, j);
+			c = wled_values(u32_opts[i].cfg, j);
 			if (c == UINT_MAX) {
 				dev_err(dev, "invalid value for '%s'\n",
 					u32_opts[i].name);
 				return -EINVAL;
 			}
+
+			if (c == val)
+				break;
 		}
 
 		dev_dbg(dev, "'%s' = %u\n", u32_opts[i].name, c);
@@ -365,6 +434,15 @@ static int wled_configure(struct wled *wled, struct device *dev)
 
 	cfg->num_strings = cfg->num_strings + 1;
 
+	string_len = of_property_count_elems_of_size(dev->of_node,
+						     "qcom,enabled-strings",
+						     sizeof(u32));
+	if (string_len > 0)
+		rc = of_property_read_u32_array(dev->of_node,
+						"qcom,enabled-strings",
+						wled->cfg.enabled_strings,
+						sizeof(u32));
+
 	return 0;
 }
 
@@ -378,6 +456,7 @@ static int wled_probe(struct platform_device *pdev)
 	struct backlight_device *bl;
 	struct wled *wled;
 	struct regmap *regmap;
+	int version;
 	u32 val;
 	int rc;
 
@@ -392,22 +471,39 @@ static int wled_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	wled->regmap = regmap;
+	wled->dev = &pdev->dev;
 
-	rc = wled_configure(wled, &pdev->dev);
-	if (rc)
-		return rc;
+	version = (uintptr_t)of_device_get_match_data(&pdev->dev);
+	if (!version) {
+		dev_err(&pdev->dev, "Unknown device version\n");
+		return -ENODEV;
+	}
 
-	rc = wled_setup(wled);
+	rc = wled_configure(wled, version);
 	if (rc)
 		return rc;
 
+	switch (version) {
+	case WLED3:
+		rc = wled3_setup(wled);
+		if (rc) {
+			dev_err(&pdev->dev, "wled3_setup failed\n");
+			return rc;
+		}
+		break;
+
+	default:
+		dev_err(wled->dev, "Invalid WLED version\n");
+		break;
+	}
+
 	val = WLED_DEFAULT_BRIGHTNESS;
 	of_property_read_u32(pdev->dev.of_node, "default-brightness", &val);
 
 	memset(&props, 0, sizeof(struct backlight_properties));
 	props.type = BACKLIGHT_RAW;
 	props.brightness = val;
-	props.max_brightness = WLED3_SINK_REG_BRIGHT_MAX;
+	props.max_brightness = WLED_SINK_REG_BRIGHT_MAX;
 	bl = devm_backlight_device_register(&pdev->dev, wled->name,
 					    &pdev->dev, wled,
 					    &wled_ops, &props);
@@ -415,7 +511,7 @@ static int wled_probe(struct platform_device *pdev)
 };
 
 static const struct of_device_id wled_match_table[] = {
-	{ .compatible = "qcom,pm8941-wled" },
+	{ .compatible = "qcom,pm8941-wled", .data = (void *)3 },
 	{}
 };
 MODULE_DEVICE_TABLE(of, wled_match_table);
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
 a Linux Foundation Collaborative Project


^ permalink raw reply related	[flat|nested] 33+ messages in thread

* Re: [PATCH V4 5/8] backlight: qcom-wled: Restructure the driver for WLED3
  2018-07-09 10:22 ` [PATCH V4 5/8] backlight: qcom-wled: Restructure the driver for WLED3 Kiran Gunda
@ 2018-07-20 13:40   ` Daniel Thompson
  2018-08-07  5:37   ` Bjorn Andersson
  1 sibling, 0 replies; 33+ messages in thread
From: Daniel Thompson @ 2018-07-20 13:40 UTC (permalink / raw)
  To: Kiran Gunda, bjorn.andersson, jingoohan1, lee.jones,
	b.zolnierkie, dri-devel, jacek.anaszewski, pavel, robh+dt,
	mark.rutland, linux-leds, devicetree, linux-kernel, linux-fbdev
  Cc: linux-arm-msm

On 09/07/18 11:22, Kiran Gunda wrote:
> Restructure the driver to add the support for new WLED
> peripherals.
> 
> Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>

Acked-by: Daniel Thompson <daniel.thompson@linaro.org>


> ---
> Changes from V3:
> 	- This is the new patch after splitting the
> 	  "backlight: qcom-wled: Add support for WLED4 peripheral" patch
> 	  to seperate the WLED3 specific restructure.
> 		
>   drivers/video/backlight/qcom-wled.c | 396 ++++++++++++++++++++++--------------
>   1 file changed, 246 insertions(+), 150 deletions(-)
> 
> diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
> index 3cd6e75..87fc1d0 100644
> --- a/drivers/video/backlight/qcom-wled.c
> +++ b/drivers/video/backlight/qcom-wled.c
> @@ -15,59 +15,71 @@
>   #include <linux/module.h>
>   #include <linux/of.h>
>   #include <linux/of_device.h>
> +#include <linux/of_address.h>
>   #include <linux/regmap.h>
>   
>   /* From DT binding */
> +#define WLED_MAX_STRINGS				4
> +
>   #define WLED_DEFAULT_BRIGHTNESS				2048
>   
> -#define WLED3_SINK_REG_BRIGHT_MAX			0xFFF
> -#define WLED3_CTRL_REG_VAL_BASE				0x40
> +#define WLED_SINK_REG_BRIGHT_MAX			0xFFF
>   
> -/* WLED3 control registers */
> -#define WLED3_CTRL_REG_MOD_EN				0x46
> -#define  WLED3_CTRL_REG_MOD_EN_BIT			BIT(7)
> -#define  WLED3_CTRL_REG_MOD_EN_MASK			BIT(7)
> +/* WLED control registers */
> +#define WLED_CTRL_REG_MOD_EN				0x46
> +#define  WLED_CTRL_REG_MOD_EN_MASK			BIT(7)
> +#define  WLED_CTRL_REG_MOD_EN_SHIFT			7
>   
> -#define WLED3_CTRL_REG_FREQ				0x4c
> -#define  WLED3_CTRL_REG_FREQ_MASK			0x0f
> +#define WLED_CTRL_REG_FREQ				0x4c
> +#define  WLED_CTRL_REG_FREQ_MASK			GENMASK(3, 0)
>   
> -#define WLED3_CTRL_REG_OVP				0x4d
> -#define  WLED3_CTRL_REG_OVP_MASK			0x03
> +#define WLED_CTRL_REG_OVP				0x4d
> +#define  WLED_CTRL_REG_OVP_MASK				GENMASK(1, 0)
>   
> -#define WLED3_CTRL_REG_ILIMIT				0x4e
> -#define  WLED3_CTRL_REG_ILIMIT_MASK			0x07
> +#define WLED_CTRL_REG_ILIMIT				0x4e
> +#define  WLED_CTRL_REG_ILIMIT_MASK			GENMASK(2, 0)
>   
> -/* WLED3 sink registers */
> -#define WLED3_SINK_REG_SYNC				0x47
> -#define  WLED3_SINK_REG_SYNC_MASK			0x07
> -#define  WLED3_SINK_REG_SYNC_LED1			BIT(0)
> -#define  WLED3_SINK_REG_SYNC_LED2			BIT(1)
> -#define  WLED3_SINK_REG_SYNC_LED3			BIT(2)
> -#define  WLED3_SINK_REG_SYNC_ALL			0x07
> -#define  WLED3_SINK_REG_SYNC_CLEAR			0x00
> +/* WLED sink registers */
> +#define WLED_SINK_REG_SYNC				0x47
> +#define  WLED_SINK_REG_SYNC_CLEAR			0x00
>   
>   #define WLED3_SINK_REG_CURR_SINK			0x4f
> -#define  WLED3_SINK_REG_CURR_SINK_MASK			0xe0
> -#define  WLED3_SINK_REG_CURR_SINK_SHFT			0x05
> +#define  WLED3_SINK_REG_CURR_SINK_MASK			GENMASK(7, 5)
> +#define  WLED3_SINK_REG_CURR_SINK_SHFT			5
>   
> -/* WLED3 per-'string' registers below */
> -#define WLED3_SINK_REG_STR_OFFSET			0x10
> +/* WLED3 specific per-'string' registers below */
> +#define WLED3_SINK_REG_BRIGHT(n)			(0x40 + n)
>   
> -#define WLED3_SINK_REG_STR_MOD_EN_BASE			0x60
> +#define WLED3_SINK_REG_STR_MOD_EN(n)			(0x60 + (n * 0x10))
>   #define  WLED3_SINK_REG_STR_MOD_MASK			BIT(7)
> -#define  WLED3_SINK_REG_STR_MOD_EN			BIT(7)
>   
> -#define WLED3_SINK_REG_STR_FULL_SCALE_CURR		0x62
> -#define  WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK	0x1f
> +#define WLED3_SINK_REG_STR_FULL_SCALE_CURR(n)		(0x62 + (n * 0x10))
> +#define  WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK	GENMASK(4, 0)
>   
> -#define WLED3_SINK_REG_STR_MOD_SRC_BASE			0x63
> -#define  WLED3_SINK_REG_STR_MOD_SRC_MASK		0x01
> +#define WLED3_SINK_REG_STR_MOD_SRC(n)			(0x63 + (n * 0x10))
> +#define  WLED3_SINK_REG_STR_MOD_SRC_MASK		BIT(0)
>   #define  WLED3_SINK_REG_STR_MOD_SRC_INT			0x00
>   #define  WLED3_SINK_REG_STR_MOD_SRC_EXT			0x01
>   
> -#define WLED3_SINK_REG_STR_CABC_BASE			0x66
> +#define WLED3_SINK_REG_STR_CABC(n)			(0x66 + (n * 0x10))
>   #define  WLED3_SINK_REG_STR_CABC_MASK			BIT(7)
> -#define  WLED3_SINK_REG_STR_CABC_EN			BIT(7)
> +
> +struct wled_var_cfg {
> +	const u32 *values;
> +	u32 (*fn)(u32);
> +	int size;
> +};
> +
> +struct wled_u32_opts {
> +	const char *name;
> +	u32 *val_ptr;
> +	const struct wled_var_cfg *cfg;
> +};
> +
> +struct wled_bool_opts {
> +	const char *name;
> +	bool *val_ptr;
> +};
>   
>   struct wled_config {
>   	u32 boost_i_limit;
> @@ -75,132 +87,179 @@ struct wled_config {
>   	u32 switch_freq;
>   	u32 num_strings;
>   	u32 string_i_limit;
> +	u32 enabled_strings[WLED_MAX_STRINGS];
>   	bool cs_out_en;
>   	bool ext_gen;
> -	bool cabc_en;
> +	bool cabc;
>   };
>   
>   struct wled {
>   	const char *name;
> +	struct device *dev;
>   	struct regmap *regmap;
> -	u16 addr;
> +	u16 ctrl_addr;
> +	u16 max_string_count;
> +	u32 brightness;
> +	u32 max_brightness;
>   
>   	struct wled_config cfg;
> +	int (*wled_set_brightness)(struct wled *wled, u16 brightness);
>   };
>   
> +static int wled3_set_brightness(struct wled *wled, u16 brightness)
> +{
> +	int rc, i;
> +	u8 v[2];
> +
> +	v[0] = brightness & 0xff;
> +	v[1] = (brightness >> 8) & 0xf;
> +
> +	for (i = 0;  i < wled->cfg.num_strings; ++i) {
> +		rc = regmap_bulk_write(wled->regmap, wled->ctrl_addr +
> +				       WLED3_SINK_REG_BRIGHT(i), v, 2);
> +		if (rc < 0)
> +			return rc;
> +	}
> +
> +	return 0;
> +}
> +
> +static int wled_module_enable(struct wled *wled, int val)
> +{
> +	int rc;
> +
> +	rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
> +				WLED_CTRL_REG_MOD_EN,
> +				WLED_CTRL_REG_MOD_EN_MASK,
> +				val << WLED_CTRL_REG_MOD_EN_SHIFT);
> +	return rc;
> +}
> +
> +static int wled_sync_toggle(struct wled *wled)
> +{
> +	int rc;
> +	unsigned int mask = GENMASK(wled->max_string_count - 1, 0);
> +
> +	rc = regmap_update_bits(wled->regmap,
> +				wled->ctrl_addr + WLED_SINK_REG_SYNC,
> +				mask, mask);
> +	if (rc < 0)
> +		return rc;
> +
> +	rc = regmap_update_bits(wled->regmap,
> +				wled->ctrl_addr + WLED_SINK_REG_SYNC,
> +				mask, WLED_SINK_REG_SYNC_CLEAR);
> +
> +	return rc;
> +}
> +
>   static int wled_update_status(struct backlight_device *bl)
>   {
>   	struct wled *wled = bl_get_data(bl);
> -	u16 val = bl->props.brightness;
> -	u8 ctrl = 0;
> -	int rc;
> -	int i;
> +	u16 brightness = bl->props.brightness;
> +	int rc = 0;
>   
>   	if (bl->props.power != FB_BLANK_UNBLANK ||
>   	    bl->props.fb_blank != FB_BLANK_UNBLANK ||
>   	    bl->props.state & BL_CORE_FBBLANK)
> -		val = 0;
> -
> -	if (val != 0)
> -		ctrl = WLED3_CTRL_REG_MOD_EN_BIT;
> +		brightness = 0;
>   
> -	rc = regmap_update_bits(wled->regmap,
> -			wled->addr + WLED3_CTRL_REG_MOD_EN,
> -			WLED3_CTRL_REG_MOD_EN_MASK, ctrl);
> -	if (rc)
> -		return rc;
> +	if (brightness) {
> +		rc = wled->wled_set_brightness(wled, brightness);
> +		if (rc < 0) {
> +			dev_err(wled->dev, "wled failed to set brightness rc:%d\n",
> +				rc);
> +			return rc;
> +		}
>   
> -	for (i = 0; i < wled->cfg.num_strings; ++i) {
> -		u8 v[2] = { val & 0xff, (val >> 8) & 0xf };
> +		rc = wled_sync_toggle(wled);
> +		if (rc < 0) {
> +			dev_err(wled->dev, "wled sync failed rc:%d\n", rc);
> +			return rc;
> +		}
> +	}
>   
> -		rc = regmap_bulk_write(wled->regmap,
> -				wled->addr + WLED3_CTRL_REG_VAL_BASE + 2 * i,
> -				v, 2);
> -		if (rc)
> +	if (!!brightness != !!wled->brightness) {
> +		rc = wled_module_enable(wled, !!brightness);
> +		if (rc < 0) {
> +			dev_err(wled->dev, "wled enable failed rc:%d\n", rc);
>   			return rc;
> +		}
>   	}
>   
> -	rc = regmap_update_bits(wled->regmap,
> -			wled->addr + WLED3_SINK_REG_SYNC,
> -			WLED3_SINK_REG_SYNC_MASK, WLED3_SINK_REG_SYNC_ALL);
> -	if (rc)
> -		return rc;
> +	wled->brightness = brightness;
>   
> -	rc = regmap_update_bits(wled->regmap,
> -			wled->addr + WLED3_SINK_REG_SYNC,
> -			WLED3_SINK_REG_SYNC_MASK, WLED3_SINK_REG_SYNC_CLEAR);
>   	return rc;
>   }
>   
> -static int wled_setup(struct wled *wled)
> +static int wled3_setup(struct wled *wled)
>   {
> -	int rc;
> -	int i;
> +	u16 addr;
> +	u8 sink_en = 0;
> +	int rc, i, j;
>   
>   	rc = regmap_update_bits(wled->regmap,
> -			wled->addr + WLED3_CTRL_REG_OVP,
> -			WLED3_CTRL_REG_OVP_MASK, wled->cfg.ovp);
> +				wled->ctrl_addr + WLED_CTRL_REG_OVP,
> +				WLED_CTRL_REG_OVP_MASK, wled->cfg.ovp);
>   	if (rc)
>   		return rc;
>   
>   	rc = regmap_update_bits(wled->regmap,
> -			wled->addr + WLED3_CTRL_REG_ILIMIT,
> -			WLED3_CTRL_REG_ILIMIT_MASK, wled->cfg.boost_i_limit);
> +				wled->ctrl_addr + WLED_CTRL_REG_ILIMIT,
> +				WLED_CTRL_REG_ILIMIT_MASK,
> +				wled->cfg.boost_i_limit);
>   	if (rc)
>   		return rc;
>   
>   	rc = regmap_update_bits(wled->regmap,
> -			wled->addr + WLED3_CTRL_REG_FREQ,
> -			WLED3_CTRL_REG_FREQ_MASK, wled->cfg.switch_freq);
> +				wled->ctrl_addr + WLED_CTRL_REG_FREQ,
> +				WLED_CTRL_REG_FREQ_MASK,
> +				wled->cfg.switch_freq);
>   	if (rc)
>   		return rc;
>   
> -	if (wled->cfg.cs_out_en) {
> -		u8 all = (BIT(wled->cfg.num_strings) - 1)
> -				<< WLED3_SINK_REG_CURR_SINK_SHFT;
> -
> -		rc = regmap_update_bits(wled->regmap,
> -				wled->addr + WLED3_SINK_REG_CURR_SINK,
> -				WLED3_SINK_REG_CURR_SINK_MASK, all);
> -		if (rc)
> -			return rc;
> -	}
> -
>   	for (i = 0; i < wled->cfg.num_strings; ++i) {
> -		u16 addr = wled->addr + WLED3_SINK_REG_STR_OFFSET * i;
> -
> -		rc = regmap_update_bits(wled->regmap,
> -				addr + WLED3_SINK_REG_STR_MOD_EN_BASE,
> -				WLED3_SINK_REG_STR_MOD_MASK,
> -				WLED3_SINK_REG_STR_MOD_EN);
> +		j = wled->cfg.enabled_strings[i];
> +		addr = wled->ctrl_addr + WLED3_SINK_REG_STR_MOD_EN(j);
> +		rc = regmap_update_bits(wled->regmap, addr,
> +					WLED3_SINK_REG_STR_MOD_MASK,
> +					WLED3_SINK_REG_STR_MOD_MASK);
>   		if (rc)
>   			return rc;
>   
>   		if (wled->cfg.ext_gen) {
> -			rc = regmap_update_bits(wled->regmap,
> -					addr + WLED3_SINK_REG_STR_MOD_SRC_BASE,
> -					WLED3_SINK_REG_STR_MOD_SRC_MASK,
> -					WLED3_SINK_REG_STR_MOD_SRC_EXT);
> +			addr = wled->ctrl_addr + WLED3_SINK_REG_STR_MOD_SRC(j);
> +			rc = regmap_update_bits(wled->regmap, addr,
> +						WLED3_SINK_REG_STR_MOD_SRC_MASK,
> +						WLED3_SINK_REG_STR_MOD_SRC_EXT);
>   			if (rc)
>   				return rc;
>   		}
>   
> -		rc = regmap_update_bits(wled->regmap,
> -				addr + WLED3_SINK_REG_STR_FULL_SCALE_CURR,
> -				WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK,
> -				wled->cfg.string_i_limit);
> +		addr = wled->ctrl_addr + WLED3_SINK_REG_STR_FULL_SCALE_CURR(j);
> +		rc = regmap_update_bits(wled->regmap, addr,
> +					WLED3_SINK_REG_STR_FULL_SCALE_CURR_MASK,
> +					wled->cfg.string_i_limit);
>   		if (rc)
>   			return rc;
>   
> -		rc = regmap_update_bits(wled->regmap,
> -				addr + WLED3_SINK_REG_STR_CABC_BASE,
> -				WLED3_SINK_REG_STR_CABC_MASK,
> -				wled->cfg.cabc_en ?
> -					WLED3_SINK_REG_STR_CABC_EN : 0);
> +		addr = wled->ctrl_addr + WLED3_SINK_REG_STR_CABC(j);
> +		rc = regmap_update_bits(wled->regmap, addr,
> +					WLED3_SINK_REG_STR_CABC_MASK,
> +					wled->cfg.cabc ?
> +					WLED3_SINK_REG_STR_CABC_MASK : 0);
>   		if (rc)
>   			return rc;
> +
> +		sink_en |= BIT(j + WLED3_SINK_REG_CURR_SINK_SHFT);
>   	}
>   
> +	rc = regmap_update_bits(wled->regmap,
> +				wled->ctrl_addr + WLED3_SINK_REG_CURR_SINK,
> +				WLED3_SINK_REG_CURR_SINK_MASK, sink_en);
> +	if (rc)
> +		return rc;
> +
>   	return 0;
>   }
>   
> @@ -208,17 +267,11 @@ static int wled_setup(struct wled *wled)
>   	.boost_i_limit = 3,
>   	.string_i_limit = 20,
>   	.ovp = 2,
> +	.num_strings = 3,
>   	.switch_freq = 5,
> -	.num_strings = 0,
>   	.cs_out_en = false,
>   	.ext_gen = false,
> -	.cabc_en = false,
> -};
> -
> -struct wled_var_cfg {
> -	const u32 *values;
> -	u32 (*fn)(u32);
> -	int size;
> +	.cabc = false,
>   };
>   
>   static const u32 wled3_boost_i_limit_values[] = {
> @@ -263,7 +316,11 @@ static u32 wled3_switch_freq_values_fn(u32 idx)
>   	.size = 26,
>   };
>   
> -static u32 wled3_values(const struct wled_var_cfg *cfg, u32 idx)
> +static const struct wled_var_cfg wled3_string_cfg = {
> +	.size = 8,
> +};
> +
> +static u32 wled_values(const struct wled_var_cfg *cfg, u32 idx)
>   {
>   	if (idx >= cfg->size)
>   		return UINT_MAX;
> @@ -274,68 +331,77 @@ static u32 wled3_values(const struct wled_var_cfg *cfg, u32 idx)
>   	return idx;
>   }
>   
> -static int wled_configure(struct wled *wled, struct device *dev)
> +#define	WLED3	3
> +
> +static int wled_configure(struct wled *wled, int version)
>   {
>   	struct wled_config *cfg = &wled->cfg;
> -	u32 val;
> -	int rc;
> -	u32 c;
> -	int i;
> -	int j;
> -
> -	const struct {
> -		const char *name;
> -		u32 *val_ptr;
> -		const struct wled_var_cfg *cfg;
> -	} u32_opts[] = {
> +	struct device *dev = wled->dev;
> +	const __be32 *prop_addr;
> +	u32 size, val, c, string_len;
> +	int rc, i, j;
> +
> +	const struct wled_u32_opts *u32_opts = NULL;
> +	const struct wled_u32_opts wled3_opts[] = {
>   		{
> -			"qcom,current-boost-limit",
> -			&cfg->boost_i_limit,
> +			.name = "qcom,current-boost-limit",
> +			.val_ptr = &cfg->boost_i_limit,
>   			.cfg = &wled3_boost_i_limit_cfg,
>   		},
>   		{
> -			"qcom,current-limit",
> -			&cfg->string_i_limit,
> +			.name = "qcom,current-limit",
> +			.val_ptr = &cfg->string_i_limit,
>   			.cfg = &wled3_string_i_limit_cfg,
>   		},
>   		{
> -			"qcom,ovp",
> -			&cfg->ovp,
> +			.name = "qcom,ovp",
> +			.val_ptr = &cfg->ovp,
>   			.cfg = &wled3_ovp_cfg,
>   		},
>   		{
> -			"qcom,switching-freq",
> -			&cfg->switch_freq,
> +			.name = "qcom,switching-freq",
> +			.val_ptr = &cfg->switch_freq,
>   			.cfg = &wled3_switch_freq_cfg,
>   		},
>   		{
> -			"qcom,num-strings",
> -			&cfg->num_strings,
> +			.name = "qcom,num-strings",
> +			.val_ptr = &cfg->num_strings,
>   			.cfg = &wled3_num_strings_cfg,
>   		},
>   	};
> -	const struct {
> -		const char *name;
> -		bool *val_ptr;
> -	} bool_opts[] = {
> +
> +	const struct wled_bool_opts bool_opts[] = {
>   		{ "qcom,cs-out", &cfg->cs_out_en, },
>   		{ "qcom,ext-gen", &cfg->ext_gen, },
> -		{ "qcom,cabc", &cfg->cabc_en, },
> +		{ "qcom,cabc", &cfg->cabc, },
>   	};
>   
> -	rc = of_property_read_u32(dev->of_node, "reg", &val);
> -	if (rc || val > 0xffff) {
> -		dev_err(dev, "invalid IO resources\n");
> -		return rc ? rc : -EINVAL;
> +	prop_addr = of_get_address(dev->of_node, 0, NULL, NULL);
> +	if (!prop_addr) {
> +		dev_err(wled->dev, "invalid IO resources\n");
> +		return -EINVAL;
>   	}
> -	wled->addr = val;
> +	wled->ctrl_addr = be32_to_cpu(*prop_addr);
>   
>   	rc = of_property_read_string(dev->of_node, "label", &wled->name);
>   	if (rc)
>   		wled->name = dev->of_node->name;
>   
> -	*cfg = wled3_config_defaults;
> -	for (i = 0; i < ARRAY_SIZE(u32_opts); ++i) {
> +	switch (version) {
> +	case WLED3:
> +		u32_opts = wled3_opts;
> +		size = ARRAY_SIZE(wled3_opts);
> +		*cfg = wled3_config_defaults;
> +		wled->wled_set_brightness = wled3_set_brightness;
> +		wled->max_string_count = 3;
> +		break;
> +
> +	default:
> +		dev_err(wled->dev, "Invalid WLED version\n");
> +		break;
> +	}
> +
> +	for (i = 0; i < size; ++i) {
>   		rc = of_property_read_u32(dev->of_node, u32_opts[i].name, &val);
>   		if (rc == -EINVAL) {
>   			continue;
> @@ -346,12 +412,15 @@ static int wled_configure(struct wled *wled, struct device *dev)
>   
>   		c = UINT_MAX;
>   		for (j = 0; c != val; j++) {
> -			c = wled3_values(u32_opts[i].cfg, j);
> +			c = wled_values(u32_opts[i].cfg, j);
>   			if (c == UINT_MAX) {
>   				dev_err(dev, "invalid value for '%s'\n",
>   					u32_opts[i].name);
>   				return -EINVAL;
>   			}
> +
> +			if (c == val)
> +				break;
>   		}
>   
>   		dev_dbg(dev, "'%s' = %u\n", u32_opts[i].name, c);
> @@ -365,6 +434,15 @@ static int wled_configure(struct wled *wled, struct device *dev)
>   
>   	cfg->num_strings = cfg->num_strings + 1;
>   
> +	string_len = of_property_count_elems_of_size(dev->of_node,
> +						     "qcom,enabled-strings",
> +						     sizeof(u32));
> +	if (string_len > 0)
> +		rc = of_property_read_u32_array(dev->of_node,
> +						"qcom,enabled-strings",
> +						wled->cfg.enabled_strings,
> +						sizeof(u32));
> +
>   	return 0;
>   }
>   
> @@ -378,6 +456,7 @@ static int wled_probe(struct platform_device *pdev)
>   	struct backlight_device *bl;
>   	struct wled *wled;
>   	struct regmap *regmap;
> +	int version;
>   	u32 val;
>   	int rc;
>   
> @@ -392,22 +471,39 @@ static int wled_probe(struct platform_device *pdev)
>   		return -ENOMEM;
>   
>   	wled->regmap = regmap;
> +	wled->dev = &pdev->dev;
>   
> -	rc = wled_configure(wled, &pdev->dev);
> -	if (rc)
> -		return rc;
> +	version = (uintptr_t)of_device_get_match_data(&pdev->dev);
> +	if (!version) {
> +		dev_err(&pdev->dev, "Unknown device version\n");
> +		return -ENODEV;
> +	}
>   
> -	rc = wled_setup(wled);
> +	rc = wled_configure(wled, version);
>   	if (rc)
>   		return rc;
>   
> +	switch (version) {
> +	case WLED3:
> +		rc = wled3_setup(wled);
> +		if (rc) {
> +			dev_err(&pdev->dev, "wled3_setup failed\n");
> +			return rc;
> +		}
> +		break;
> +
> +	default:
> +		dev_err(wled->dev, "Invalid WLED version\n");
> +		break;
> +	}
> +
>   	val = WLED_DEFAULT_BRIGHTNESS;
>   	of_property_read_u32(pdev->dev.of_node, "default-brightness", &val);
>   
>   	memset(&props, 0, sizeof(struct backlight_properties));
>   	props.type = BACKLIGHT_RAW;
>   	props.brightness = val;
> -	props.max_brightness = WLED3_SINK_REG_BRIGHT_MAX;
> +	props.max_brightness = WLED_SINK_REG_BRIGHT_MAX;
>   	bl = devm_backlight_device_register(&pdev->dev, wled->name,
>   					    &pdev->dev, wled,
>   					    &wled_ops, &props);
> @@ -415,7 +511,7 @@ static int wled_probe(struct platform_device *pdev)
>   };
>   
>   static const struct of_device_id wled_match_table[] = {
> -	{ .compatible = "qcom,pm8941-wled" },
> +	{ .compatible = "qcom,pm8941-wled", .data = (void *)3 },
>   	{}
>   };
>   MODULE_DEVICE_TABLE(of, wled_match_table);
> 


^ permalink raw reply	[flat|nested] 33+ messages in thread

* Re: [PATCH V4 5/8] backlight: qcom-wled: Restructure the driver for WLED3
  2018-07-09 10:22 ` [PATCH V4 5/8] backlight: qcom-wled: Restructure the driver for WLED3 Kiran Gunda
  2018-07-20 13:40   ` Daniel Thompson
@ 2018-08-07  5:37   ` Bjorn Andersson
  2018-08-16  5:28     ` kgunda
  1 sibling, 1 reply; 33+ messages in thread
From: Bjorn Andersson @ 2018-08-07  5:37 UTC (permalink / raw)
  To: Kiran Gunda
  Cc: jingoohan1, lee.jones, b.zolnierkie, dri-devel, daniel.thompson,
	jacek.anaszewski, pavel, robh+dt, mark.rutland, linux-leds,
	devicetree, linux-kernel, linux-fbdev, linux-arm-msm

On Mon 09 Jul 03:22 PDT 2018, Kiran Gunda wrote:
> diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
[..]
> @@ -365,6 +434,15 @@ static int wled_configure(struct wled *wled, struct device *dev)
>  
>  	cfg->num_strings = cfg->num_strings + 1;
>  
> +	string_len = of_property_count_elems_of_size(dev->of_node,
> +						     "qcom,enabled-strings",
> +						     sizeof(u32));
> +	if (string_len > 0)
> +		rc = of_property_read_u32_array(dev->of_node,
> +						"qcom,enabled-strings",
> +						wled->cfg.enabled_strings,

qcom,enabled-strings is listed as optional, but without it we will end
up with qcom,num-strings zeros in an array.  Initialize
wled->cfg.enabled_strings to 0,1,2,3 and the driver will be backwards
compatible.

I also think that if you do qcom,enabled-strings = <0, 1, 2>; there's no
need to also specify qcom,num-strings = <3>; and we can just use
string_len for num_strings.

> +						sizeof(u32));
> +
>  	return 0;
>  }

Regards,
Bjorn

^ permalink raw reply	[flat|nested] 33+ messages in thread

* Re: [PATCH V4 5/8] backlight: qcom-wled: Restructure the driver for WLED3
  2018-08-07  5:37   ` Bjorn Andersson
@ 2018-08-16  5:28     ` kgunda
  0 siblings, 0 replies; 33+ messages in thread
From: kgunda @ 2018-08-16  5:28 UTC (permalink / raw)
  To: Bjorn Andersson
  Cc: jingoohan1, lee.jones, b.zolnierkie, dri-devel, daniel.thompson,
	jacek.anaszewski, pavel, robh+dt, mark.rutland, linux-leds,
	devicetree, linux-kernel, linux-fbdev, linux-arm-msm,
	linux-arm-msm-owner

On 2018-08-07 11:07, Bjorn Andersson wrote:
> On Mon 09 Jul 03:22 PDT 2018, Kiran Gunda wrote:
>> diff --git a/drivers/video/backlight/qcom-wled.c 
>> b/drivers/video/backlight/qcom-wled.c
> [..]
>> @@ -365,6 +434,15 @@ static int wled_configure(struct wled *wled, 
>> struct device *dev)
>> 
>>  	cfg->num_strings = cfg->num_strings + 1;
>> 
>> +	string_len = of_property_count_elems_of_size(dev->of_node,
>> +						     "qcom,enabled-strings",
>> +						     sizeof(u32));
>> +	if (string_len > 0)
>> +		rc = of_property_read_u32_array(dev->of_node,
>> +						"qcom,enabled-strings",
>> +						wled->cfg.enabled_strings,
> 
> qcom,enabled-strings is listed as optional, but without it we will end
> up with qcom,num-strings zeros in an array.  Initialize
> wled->cfg.enabled_strings to 0,1,2,3 and the driver will be backwards
> compatible.
> 
Correct. I will initialize the array in the next series.
> I also think that if you do qcom,enabled-strings = <0, 1, 2>; there's 
> no
> need to also specify qcom,num-strings = <3>; and we can just use
> string_len for num_strings.
Correct. But I have kept this property to have the backward 
compatibility with the
old driver (WLED3).
> 
>> +						sizeof(u32));
>> +
>>  	return 0;
>>  }
> 
> Regards,
> Bjorn
> --
> To unsubscribe from this list: send the line "unsubscribe 
> linux-arm-msm" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

^ permalink raw reply	[flat|nested] 33+ messages in thread

* [PATCH V4 6/8] backlight: qcom-wled: Add support for WLED4 peripheral
  2018-07-09 10:22 [PATCH V4 0/8] backlight: qcom-wled: Support for QCOM wled driver Kiran Gunda
                   ` (4 preceding siblings ...)
  2018-07-09 10:22 ` [PATCH V4 5/8] backlight: qcom-wled: Restructure the driver for WLED3 Kiran Gunda
@ 2018-07-09 10:22 ` Kiran Gunda
  2018-07-20 13:47   ` Daniel Thompson
  2018-08-07  5:45   ` Bjorn Andersson
  2018-07-09 10:22 ` [PATCH V4 7/8] backlight: qcom-wled: add support for short circuit handling Kiran Gunda
                   ` (2 subsequent siblings)
  8 siblings, 2 replies; 33+ messages in thread
From: Kiran Gunda @ 2018-07-09 10:22 UTC (permalink / raw)
  To: bjorn.andersson, jingoohan1, lee.jones, b.zolnierkie, dri-devel,
	daniel.thompson, jacek.anaszewski, pavel, robh+dt, mark.rutland,
	linux-leds, devicetree, linux-kernel, linux-fbdev
  Cc: linux-arm-msm, Kiran Gunda

WLED4 peripheral is present on some PMICs like pmi8998 and
pm660l. It has a different register map and configurations
are also different. Add support for it.

Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
---
Changes from V3:
	- The WLED3 specific changes are splitted out
	- Merged the wled3_sync_toggle and wled4_syn_toggle functions
	- Modified the compatible .data
	- Moved from if/else to switch/case to select the version specific data
	- Addressed few more minor comments from Bjorn

 drivers/video/backlight/qcom-wled.c | 264 +++++++++++++++++++++++++++++++++++-
 1 file changed, 258 insertions(+), 6 deletions(-)

diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
index 87fc1d0..362d254 100644
--- a/drivers/video/backlight/qcom-wled.c
+++ b/drivers/video/backlight/qcom-wled.c
@@ -64,6 +64,28 @@
 #define WLED3_SINK_REG_STR_CABC(n)			(0x66 + (n * 0x10))
 #define  WLED3_SINK_REG_STR_CABC_MASK			BIT(7)
 
+/* WLED4 specific sink registers */
+#define WLED4_SINK_REG_CURR_SINK			0x46
+#define  WLED4_SINK_REG_CURR_SINK_MASK			GENMASK(7, 4)
+#define  WLED4_SINK_REG_CURR_SINK_SHFT			4
+
+/* WLED4 specific per-'string' registers below */
+#define WLED4_SINK_REG_STR_MOD_EN(n)			(0x50 + (n * 0x10))
+#define  WLED4_SINK_REG_STR_MOD_MASK			BIT(7)
+
+#define WLED4_SINK_REG_STR_FULL_SCALE_CURR(n)		(0x52 + (n * 0x10))
+#define  WLED4_SINK_REG_STR_FULL_SCALE_CURR_MASK	GENMASK(3, 0)
+
+#define WLED4_SINK_REG_STR_MOD_SRC(n)			(0x53 + (n * 0x10))
+#define  WLED4_SINK_REG_STR_MOD_SRC_MASK		BIT(0)
+#define  WLED4_SINK_REG_STR_MOD_SRC_INT			0x00
+#define  WLED4_SINK_REG_STR_MOD_SRC_EXT			0x01
+
+#define WLED4_SINK_REG_STR_CABC(n)			(0x56 + (n * 0x10))
+#define  WLED4_SINK_REG_STR_CABC_MASK			BIT(7)
+
+#define WLED4_SINK_REG_BRIGHT(n)			(0x57 + (n * 0x10))
+
 struct wled_var_cfg {
 	const u32 *values;
 	u32 (*fn)(u32);
@@ -98,6 +120,7 @@ struct wled {
 	struct device *dev;
 	struct regmap *regmap;
 	u16 ctrl_addr;
+	u16 sink_addr;
 	u16 max_string_count;
 	u32 brightness;
 	u32 max_brightness;
@@ -124,6 +147,29 @@ static int wled3_set_brightness(struct wled *wled, u16 brightness)
 	return 0;
 }
 
+static int wled4_set_brightness(struct wled *wled, u16 brightness)
+{
+	int rc, i;
+	u16 low_limit = wled->max_brightness * 4 / 1000;
+	u8 v[2];
+
+	/* WLED4's lower limit of operation is 0.4% */
+	if (brightness > 0 && brightness < low_limit)
+		brightness = low_limit;
+
+	v[0] = brightness & 0xff;
+	v[1] = (brightness >> 8) & 0xf;
+
+	for (i = 0;  i < wled->cfg.num_strings; ++i) {
+		rc = regmap_bulk_write(wled->regmap, wled->sink_addr +
+				       WLED4_SINK_REG_BRIGHT(i), v, 2);
+		if (rc < 0)
+			return rc;
+	}
+
+	return 0;
+}
+
 static int wled_module_enable(struct wled *wled, int val)
 {
 	int rc;
@@ -141,13 +187,13 @@ static int wled_sync_toggle(struct wled *wled)
 	unsigned int mask = GENMASK(wled->max_string_count - 1, 0);
 
 	rc = regmap_update_bits(wled->regmap,
-				wled->ctrl_addr + WLED_SINK_REG_SYNC,
+				wled->sink_addr + WLED_SINK_REG_SYNC,
 				mask, mask);
 	if (rc < 0)
 		return rc;
 
 	rc = regmap_update_bits(wled->regmap,
-				wled->ctrl_addr + WLED_SINK_REG_SYNC,
+				wled->sink_addr + WLED_SINK_REG_SYNC,
 				mask, WLED_SINK_REG_SYNC_CLEAR);
 
 	return rc;
@@ -274,6 +320,120 @@ static int wled3_setup(struct wled *wled)
 	.cabc = false,
 };
 
+static int wled4_setup(struct wled *wled)
+{
+	int rc, temp, i, j;
+	u16 addr;
+	u8 sink_en = 0;
+	u32 sink_cfg = 0;
+
+	rc = regmap_update_bits(wled->regmap,
+				wled->ctrl_addr + WLED_CTRL_REG_OVP,
+				WLED_CTRL_REG_OVP_MASK, wled->cfg.ovp);
+	if (rc < 0)
+		return rc;
+
+	rc = regmap_update_bits(wled->regmap,
+				wled->ctrl_addr + WLED_CTRL_REG_ILIMIT,
+				WLED_CTRL_REG_ILIMIT_MASK,
+				wled->cfg.boost_i_limit);
+	if (rc < 0)
+		return rc;
+
+	rc = regmap_update_bits(wled->regmap,
+				wled->ctrl_addr + WLED_CTRL_REG_FREQ,
+				WLED_CTRL_REG_FREQ_MASK,
+				wled->cfg.switch_freq);
+	if (rc < 0)
+		return rc;
+
+	rc = regmap_read(wled->regmap, wled->sink_addr +
+			 WLED4_SINK_REG_CURR_SINK, &sink_cfg);
+	if (rc < 0)
+		return rc;
+
+	for (i = 0; i < wled->cfg.num_strings; i++) {
+		j = wled->cfg.enabled_strings[i];
+		temp = j + WLED4_SINK_REG_CURR_SINK_SHFT;
+		sink_en |= 1 << temp;
+	}
+
+	if (sink_cfg == sink_en)
+		return 0;
+
+	rc = regmap_update_bits(wled->regmap,
+				wled->sink_addr + WLED4_SINK_REG_CURR_SINK,
+				WLED4_SINK_REG_CURR_SINK_MASK, 0);
+	if (rc < 0)
+		return rc;
+
+	rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
+				WLED_CTRL_REG_MOD_EN,
+				WLED_CTRL_REG_MOD_EN_MASK, 0);
+	if (rc < 0)
+		return rc;
+
+	/* Per sink/string configuration */
+	for (i = 0; i < wled->cfg.num_strings; i++) {
+		j = wled->cfg.enabled_strings[i];
+
+		addr = wled->sink_addr +
+				WLED4_SINK_REG_STR_MOD_EN(j);
+		rc = regmap_update_bits(wled->regmap, addr,
+					WLED4_SINK_REG_STR_MOD_MASK,
+					WLED4_SINK_REG_STR_MOD_MASK);
+		if (rc < 0)
+			return rc;
+
+		addr = wled->sink_addr +
+				WLED4_SINK_REG_STR_FULL_SCALE_CURR(j);
+		rc = regmap_update_bits(wled->regmap, addr,
+					WLED4_SINK_REG_STR_FULL_SCALE_CURR_MASK,
+					wled->cfg.string_i_limit);
+		if (rc < 0)
+			return rc;
+
+		addr = wled->sink_addr +
+				WLED4_SINK_REG_STR_CABC(j);
+		rc = regmap_update_bits(wled->regmap, addr,
+					WLED4_SINK_REG_STR_CABC_MASK,
+					wled->cfg.cabc ?
+					WLED4_SINK_REG_STR_CABC_MASK : 0);
+		if (rc < 0)
+			return rc;
+	}
+
+	rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
+				WLED_CTRL_REG_MOD_EN,
+				WLED_CTRL_REG_MOD_EN_MASK,
+				WLED_CTRL_REG_MOD_EN_MASK);
+	if (rc < 0)
+		return rc;
+
+	rc = regmap_update_bits(wled->regmap,
+				wled->sink_addr + WLED4_SINK_REG_CURR_SINK,
+				WLED4_SINK_REG_CURR_SINK_MASK, sink_en);
+	if (rc < 0)
+		return rc;
+
+	rc = wled_sync_toggle(wled);
+	if (rc < 0) {
+		dev_err(wled->dev, "Failed to toggle sync reg rc:%d\n", rc);
+		return rc;
+	}
+
+	return 0;
+}
+
+static const struct wled_config wled4_config_defaults = {
+	.boost_i_limit = 4,
+	.string_i_limit = 10,
+	.ovp = 1,
+	.num_strings = 4,
+	.switch_freq = 11,
+	.cabc = false,
+};
+
 static const u32 wled3_boost_i_limit_values[] = {
 	105, 385, 525, 805, 980, 1260, 1400, 1680,
 };
@@ -283,6 +443,15 @@ static int wled3_setup(struct wled *wled)
 	.size = ARRAY_SIZE(wled3_boost_i_limit_values),
 };
 
+static const u32 wled4_boost_i_limit_values[] = {
+	105, 280, 450, 620, 970, 1150, 1300, 1500,
+};
+
+static const struct wled_var_cfg wled4_boost_i_limit_cfg = {
+	.values = wled4_boost_i_limit_values,
+	.size = ARRAY_SIZE(wled4_boost_i_limit_values),
+};
+
 static const u32 wled3_ovp_values[] = {
 	35, 32, 29, 27,
 };
@@ -292,6 +461,15 @@ static int wled3_setup(struct wled *wled)
 	.size = ARRAY_SIZE(wled3_ovp_values),
 };
 
+static const u32 wled4_ovp_values[] = {
+	31100, 29600, 19600, 18100,
+};
+
+static const struct wled_var_cfg wled4_ovp_cfg = {
+	.values = wled4_ovp_values,
+	.size = ARRAY_SIZE(wled4_ovp_values),
+};
+
 static u32 wled3_num_strings_values_fn(u32 idx)
 {
 	return idx + 1;
@@ -302,6 +480,11 @@ static u32 wled3_num_strings_values_fn(u32 idx)
 	.size = 3,
 };
 
+static const struct wled_var_cfg wled4_num_strings_cfg = {
+	.fn = wled3_num_strings_values_fn,
+	.size = 4,
+};
+
 static u32 wled3_switch_freq_values_fn(u32 idx)
 {
 	return 19200 / (2 * (1 + idx));
@@ -316,10 +499,24 @@ static u32 wled3_switch_freq_values_fn(u32 idx)
 	.size = 26,
 };
 
+static const u32 wled4_string_i_limit_values[] = {
+	0, 2500, 5000, 7500, 10000, 12500, 15000, 17500, 20000,
+	22500, 25000, 27500, 30000,
+};
+
+static const struct wled_var_cfg wled4_string_i_limit_cfg = {
+	.values = wled4_string_i_limit_values,
+	.size = ARRAY_SIZE(wled4_string_i_limit_values),
+};
+
 static const struct wled_var_cfg wled3_string_cfg = {
 	.size = 8,
 };
 
+static const struct wled_var_cfg wled4_string_cfg = {
+	.size = 16,
+};
+
 static u32 wled_values(const struct wled_var_cfg *cfg, u32 idx)
 {
 	if (idx >= cfg->size)
@@ -332,6 +529,7 @@ static u32 wled_values(const struct wled_var_cfg *cfg, u32 idx)
 }
 
 #define	WLED3	3
+#define	WLED4	4
 
 static int wled_configure(struct wled *wled, int version)
 {
@@ -370,6 +568,34 @@ static int wled_configure(struct wled *wled, int version)
 		},
 	};
 
+	const struct wled_u32_opts wled4_opts[] = {
+		{
+			.name = "qcom,current-boost-limit",
+			.val_ptr = &cfg->boost_i_limit,
+			.cfg = &wled4_boost_i_limit_cfg,
+		},
+		{
+			.name = "qcom,current-limit-microamp",
+			.val_ptr = &cfg->string_i_limit,
+			.cfg = &wled4_string_i_limit_cfg,
+		},
+		{
+			.name = "qcom,ovp-millivolt",
+			.val_ptr = &cfg->ovp,
+			.cfg = &wled4_ovp_cfg,
+		},
+		{
+			.name = "qcom,switching-freq",
+			.val_ptr = &cfg->switch_freq,
+			.cfg = &wled3_switch_freq_cfg,
+		},
+		{
+			.name = "qcom,num-strings",
+			.val_ptr = &cfg->num_strings,
+			.cfg = &wled4_num_strings_cfg,
+		},
+	};
+
 	const struct wled_bool_opts bool_opts[] = {
 		{ "qcom,cs-out", &cfg->cs_out_en, },
 		{ "qcom,ext-gen", &cfg->ext_gen, },
@@ -383,10 +609,6 @@ static int wled_configure(struct wled *wled, int version)
 	}
 	wled->ctrl_addr = be32_to_cpu(*prop_addr);
 
-	rc = of_property_read_string(dev->of_node, "label", &wled->name);
-	if (rc)
-		wled->name = dev->of_node->name;
-
 	switch (version) {
 	case WLED3:
 		u32_opts = wled3_opts;
@@ -394,6 +616,22 @@ static int wled_configure(struct wled *wled, int version)
 		*cfg = wled3_config_defaults;
 		wled->wled_set_brightness = wled3_set_brightness;
 		wled->max_string_count = 3;
+		wled->sink_addr = wled->ctrl_addr;
+		break;
+
+	case WLED4:
+		u32_opts = wled4_opts;
+		size = ARRAY_SIZE(wled4_opts);
+		*cfg = wled4_config_defaults;
+		wled->wled_set_brightness = wled4_set_brightness;
+		wled->max_string_count = 4;
+
+		prop_addr = of_get_address(dev->of_node, 1, NULL, NULL);
+		if (!prop_addr) {
+			dev_err(wled->dev, "invalid IO resources\n");
+			return -EINVAL;
+		}
+		wled->sink_addr = be32_to_cpu(*prop_addr);
 		break;
 
 	default:
@@ -401,6 +639,10 @@ static int wled_configure(struct wled *wled, int version)
 		break;
 	}
 
+	rc = of_property_read_string(dev->of_node, "label", &wled->name);
+	if (rc)
+		wled->name = dev->of_node->name;
+
 	for (i = 0; i < size; ++i) {
 		rc = of_property_read_u32(dev->of_node, u32_opts[i].name, &val);
 		if (rc == -EINVAL) {
@@ -492,6 +734,14 @@ static int wled_probe(struct platform_device *pdev)
 		}
 		break;
 
+	case WLED4:
+		rc = wled4_setup(wled);
+		if (rc) {
+			dev_err(&pdev->dev, "wled4_setup failed\n");
+			return rc;
+		}
+		break;
+
 	default:
 		dev_err(wled->dev, "Invalid WLED version\n");
 		break;
@@ -512,6 +762,8 @@ static int wled_probe(struct platform_device *pdev)
 
 static const struct of_device_id wled_match_table[] = {
 	{ .compatible = "qcom,pm8941-wled", .data = (void *)3 },
+	{ .compatible = "qcom,pmi8998-wled", .data = (void *)4 },
+	{ .compatible = "qcom,pm660l-wled", .data = (void *)4 },
 	{}
 };
 MODULE_DEVICE_TABLE(of, wled_match_table);
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
 a Linux Foundation Collaborative Project


^ permalink raw reply related	[flat|nested] 33+ messages in thread

* Re: [PATCH V4 6/8] backlight: qcom-wled: Add support for WLED4 peripheral
  2018-07-09 10:22 ` [PATCH V4 6/8] backlight: qcom-wled: Add support for WLED4 peripheral Kiran Gunda
@ 2018-07-20 13:47   ` Daniel Thompson
  2018-07-20 21:21     ` Pavel Machek
  2018-08-07  5:45   ` Bjorn Andersson
  1 sibling, 1 reply; 33+ messages in thread
From: Daniel Thompson @ 2018-07-20 13:47 UTC (permalink / raw)
  To: Kiran Gunda, bjorn.andersson, jingoohan1, lee.jones,
	b.zolnierkie, dri-devel, jacek.anaszewski, pavel, robh+dt,
	mark.rutland, linux-leds, devicetree, linux-kernel, linux-fbdev
  Cc: linux-arm-msm

On 09/07/18 11:22, Kiran Gunda wrote:
> WLED4 peripheral is present on some PMICs like pmi8998 and
> pm660l. It has a different register map and configurations
> are also different. Add support for it.
> 
> Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
> ---
> Changes from V3:
> 	- The WLED3 specific changes are splitted out
> 	- Merged the wled3_sync_toggle and wled4_syn_toggle functions
> 	- Modified the compatible .data
> 	- Moved from if/else to switch/case to select the version specific data
> 	- Addressed few more minor comments from Bjorn
> 
>   drivers/video/backlight/qcom-wled.c | 264 +++++++++++++++++++++++++++++++++++-
>   1 file changed, 258 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
> index 87fc1d0..362d254 100644
> --- a/drivers/video/backlight/qcom-wled.c
> +++ b/drivers/video/backlight/qcom-wled.c
> @@ -64,6 +64,28 @@
>   #define WLED3_SINK_REG_STR_CABC(n)			(0x66 + (n * 0x10))
>   #define  WLED3_SINK_REG_STR_CABC_MASK			BIT(7)
>   
> +/* WLED4 specific sink registers */
> +#define WLED4_SINK_REG_CURR_SINK			0x46
> +#define  WLED4_SINK_REG_CURR_SINK_MASK			GENMASK(7, 4)
> +#define  WLED4_SINK_REG_CURR_SINK_SHFT			4
> +
> +/* WLED4 specific per-'string' registers below */
> +#define WLED4_SINK_REG_STR_MOD_EN(n)			(0x50 + (n * 0x10))
> +#define  WLED4_SINK_REG_STR_MOD_MASK			BIT(7)
> +
> +#define WLED4_SINK_REG_STR_FULL_SCALE_CURR(n)		(0x52 + (n * 0x10))
> +#define  WLED4_SINK_REG_STR_FULL_SCALE_CURR_MASK	GENMASK(3, 0)
> +
> +#define WLED4_SINK_REG_STR_MOD_SRC(n)			(0x53 + (n * 0x10))
> +#define  WLED4_SINK_REG_STR_MOD_SRC_MASK		BIT(0)
> +#define  WLED4_SINK_REG_STR_MOD_SRC_INT			0x00
> +#define  WLED4_SINK_REG_STR_MOD_SRC_EXT			0x01
> +
> +#define WLED4_SINK_REG_STR_CABC(n)			(0x56 + (n * 0x10))
> +#define  WLED4_SINK_REG_STR_CABC_MASK			BIT(7)
> +
> +#define WLED4_SINK_REG_BRIGHT(n)			(0x57 + (n * 0x10))
> +
>   struct wled_var_cfg {
>   	const u32 *values;
>   	u32 (*fn)(u32);
> @@ -98,6 +120,7 @@ struct wled {
>   	struct device *dev;
>   	struct regmap *regmap;
>   	u16 ctrl_addr;
> +	u16 sink_addr;
>   	u16 max_string_count;
>   	u32 brightness;
>   	u32 max_brightness;
> @@ -124,6 +147,29 @@ static int wled3_set_brightness(struct wled *wled, u16 brightness)
>   	return 0;
>   }
>   
> +static int wled4_set_brightness(struct wled *wled, u16 brightness)
> +{
> +	int rc, i;
> +	u16 low_limit = wled->max_brightness * 4 / 1000;
> +	u8 v[2];
> +
> +	/* WLED4's lower limit of operation is 0.4% */
> +	if (brightness > 0 && brightness < low_limit)
> +		brightness = low_limit;
> +
> +	v[0] = brightness & 0xff;
> +	v[1] = (brightness >> 8) & 0xf;
> +
> +	for (i = 0;  i < wled->cfg.num_strings; ++i) {
> +		rc = regmap_bulk_write(wled->regmap, wled->sink_addr +
> +				       WLED4_SINK_REG_BRIGHT(i), v, 2);
> +		if (rc < 0)
> +			return rc;
> +	}
> +
> +	return 0;
> +}
> +
>   static int wled_module_enable(struct wled *wled, int val)
>   {
>   	int rc;
> @@ -141,13 +187,13 @@ static int wled_sync_toggle(struct wled *wled)
>   	unsigned int mask = GENMASK(wled->max_string_count - 1, 0);
>   
>   	rc = regmap_update_bits(wled->regmap,
> -				wled->ctrl_addr + WLED_SINK_REG_SYNC,
> +				wled->sink_addr + WLED_SINK_REG_SYNC,
>   				mask, mask);
>   	if (rc < 0)
>   		return rc;
>   
>   	rc = regmap_update_bits(wled->regmap,
> -				wled->ctrl_addr + WLED_SINK_REG_SYNC,
> +				wled->sink_addr + WLED_SINK_REG_SYNC,
>   				mask, WLED_SINK_REG_SYNC_CLEAR);
>   
>   	return rc;
> @@ -274,6 +320,120 @@ static int wled3_setup(struct wled *wled)
>   	.cabc = false,
>   };
>   
> +static int wled4_setup(struct wled *wled)
> +{
> +	int rc, temp, i, j;
> +	u16 addr;
> +	u8 sink_en = 0;
> +	u32 sink_cfg = 0;
> +
> +	rc = regmap_update_bits(wled->regmap,
> +				wled->ctrl_addr + WLED_CTRL_REG_OVP,
> +				WLED_CTRL_REG_OVP_MASK, wled->cfg.ovp);
> +	if (rc < 0)
> +		return rc;
> +
> +	rc = regmap_update_bits(wled->regmap,
> +				wled->ctrl_addr + WLED_CTRL_REG_ILIMIT,
> +				WLED_CTRL_REG_ILIMIT_MASK,
> +				wled->cfg.boost_i_limit);
> +	if (rc < 0)
> +		return rc;
> +
> +	rc = regmap_update_bits(wled->regmap,
> +				wled->ctrl_addr + WLED_CTRL_REG_FREQ,
> +				WLED_CTRL_REG_FREQ_MASK,
> +				wled->cfg.switch_freq);
> +	if (rc < 0)
> +		return rc;
> +
> +	rc = regmap_read(wled->regmap, wled->sink_addr +
> +			 WLED4_SINK_REG_CURR_SINK, &sink_cfg);
> +	if (rc < 0)
> +		return rc;
> +
> +	for (i = 0; i < wled->cfg.num_strings; i++) {
> +		j = wled->cfg.enabled_strings[i];
> +		temp = j + WLED4_SINK_REG_CURR_SINK_SHFT;
> +		sink_en |= 1 << temp;
> +	}
> +
> +	if (sink_cfg == sink_en)
> +		return 0;
> +
> +	rc = regmap_update_bits(wled->regmap,
> +				wled->sink_addr + WLED4_SINK_REG_CURR_SINK,
> +				WLED4_SINK_REG_CURR_SINK_MASK, 0);
> +	if (rc < 0)
> +		return rc;
> +
> +	rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
> +				WLED_CTRL_REG_MOD_EN,
> +				WLED_CTRL_REG_MOD_EN_MASK, 0);
> +	if (rc < 0)
> +		return rc;
> +
> +	/* Per sink/string configuration */
> +	for (i = 0; i < wled->cfg.num_strings; i++) {
> +		j = wled->cfg.enabled_strings[i];
> +
> +		addr = wled->sink_addr +
> +				WLED4_SINK_REG_STR_MOD_EN(j);
> +		rc = regmap_update_bits(wled->regmap, addr,
> +					WLED4_SINK_REG_STR_MOD_MASK,
> +					WLED4_SINK_REG_STR_MOD_MASK);
> +		if (rc < 0)
> +			return rc;
> +
> +		addr = wled->sink_addr +
> +				WLED4_SINK_REG_STR_FULL_SCALE_CURR(j);
> +		rc = regmap_update_bits(wled->regmap, addr,
> +					WLED4_SINK_REG_STR_FULL_SCALE_CURR_MASK,
> +					wled->cfg.string_i_limit);
> +		if (rc < 0)
> +			return rc;
> +
> +		addr = wled->sink_addr +
> +				WLED4_SINK_REG_STR_CABC(j);
> +		rc = regmap_update_bits(wled->regmap, addr,
> +					WLED4_SINK_REG_STR_CABC_MASK,
> +					wled->cfg.cabc ?
> +					WLED4_SINK_REG_STR_CABC_MASK : 0);
> +		if (rc < 0)
> +			return rc;
> +	}
> +
> +	rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
> +				WLED_CTRL_REG_MOD_EN,
> +				WLED_CTRL_REG_MOD_EN_MASK,
> +				WLED_CTRL_REG_MOD_EN_MASK);
> +	if (rc < 0)
> +		return rc;
> +
> +	rc = regmap_update_bits(wled->regmap,
> +				wled->sink_addr + WLED4_SINK_REG_CURR_SINK,
> +				WLED4_SINK_REG_CURR_SINK_MASK, sink_en);
> +	if (rc < 0)
> +		return rc;
> +
> +	rc = wled_sync_toggle(wled);
> +	if (rc < 0) {
> +		dev_err(wled->dev, "Failed to toggle sync reg rc:%d\n", rc);
> +		return rc;
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct wled_config wled4_config_defaults = {
> +	.boost_i_limit = 4,
> +	.string_i_limit = 10,
> +	.ovp = 1,
> +	.num_strings = 4,
> +	.switch_freq = 11,
> +	.cabc = false,
> +};
> +
>   static const u32 wled3_boost_i_limit_values[] = {
>   	105, 385, 525, 805, 980, 1260, 1400, 1680,
>   };
> @@ -283,6 +443,15 @@ static int wled3_setup(struct wled *wled)
>   	.size = ARRAY_SIZE(wled3_boost_i_limit_values),
>   };
>   
> +static const u32 wled4_boost_i_limit_values[] = {
> +	105, 280, 450, 620, 970, 1150, 1300, 1500,
> +};
> +
> +static const struct wled_var_cfg wled4_boost_i_limit_cfg = {
> +	.values = wled4_boost_i_limit_values,
> +	.size = ARRAY_SIZE(wled4_boost_i_limit_values),
> +};
> +
>   static const u32 wled3_ovp_values[] = {
>   	35, 32, 29, 27,
>   };
> @@ -292,6 +461,15 @@ static int wled3_setup(struct wled *wled)
>   	.size = ARRAY_SIZE(wled3_ovp_values),
>   };
>   
> +static const u32 wled4_ovp_values[] = {
> +	31100, 29600, 19600, 18100,
> +};
> +
> +static const struct wled_var_cfg wled4_ovp_cfg = {
> +	.values = wled4_ovp_values,
> +	.size = ARRAY_SIZE(wled4_ovp_values),
> +};
> +
>   static u32 wled3_num_strings_values_fn(u32 idx)
>   {
>   	return idx + 1;
> @@ -302,6 +480,11 @@ static u32 wled3_num_strings_values_fn(u32 idx)
>   	.size = 3,
>   };
>   
> +static const struct wled_var_cfg wled4_num_strings_cfg = {
> +	.fn = wled3_num_strings_values_fn,
> +	.size = 4,
> +};
> +
>   static u32 wled3_switch_freq_values_fn(u32 idx)
>   {
>   	return 19200 / (2 * (1 + idx));
> @@ -316,10 +499,24 @@ static u32 wled3_switch_freq_values_fn(u32 idx)
>   	.size = 26,
>   };
>   
> +static const u32 wled4_string_i_limit_values[] = {
> +	0, 2500, 5000, 7500, 10000, 12500, 15000, 17500, 20000,
> +	22500, 25000, 27500, 30000,
> +};
> +
> +static const struct wled_var_cfg wled4_string_i_limit_cfg = {
> +	.values = wled4_string_i_limit_values,
> +	.size = ARRAY_SIZE(wled4_string_i_limit_values),
> +};
> +
>   static const struct wled_var_cfg wled3_string_cfg = {
>   	.size = 8,
>   };
>   
> +static const struct wled_var_cfg wled4_string_cfg = {
> +	.size = 16,
> +};
> +
>   static u32 wled_values(const struct wled_var_cfg *cfg, u32 idx)
>   {
>   	if (idx >= cfg->size)
> @@ -332,6 +529,7 @@ static u32 wled_values(const struct wled_var_cfg *cfg, u32 idx)
>   }
>   
>   #define	WLED3	3
> +#define	WLED4	4

Are these macros always going to define 3 to be 3 and 4 to be 4. If so 
we probably don't need them (and they should be removed from patch 5/8 too).

There is a degree of nitpicking here however. The rest looks OK to me.


Daniel.

^ permalink raw reply	[flat|nested] 33+ messages in thread

* Re: [PATCH V4 6/8] backlight: qcom-wled: Add support for WLED4 peripheral
  2018-07-20 13:47   ` Daniel Thompson
@ 2018-07-20 21:21     ` Pavel Machek
  2018-07-23  6:16       ` kgunda
  0 siblings, 1 reply; 33+ messages in thread
From: Pavel Machek @ 2018-07-20 21:21 UTC (permalink / raw)
  To: Daniel Thompson
  Cc: Kiran Gunda, bjorn.andersson, jingoohan1, lee.jones,
	b.zolnierkie, dri-devel, jacek.anaszewski, robh+dt, mark.rutland,
	linux-leds, devicetree, linux-kernel, linux-fbdev, linux-arm-msm

[-- Attachment #1: Type: text/plain, Size: 659 bytes --]

Hi!

> >@@ -332,6 +529,7 @@ static u32 wled_values(const struct wled_var_cfg *cfg, u32 idx)
> >  }
> >  #define	WLED3	3
> >+#define	WLED4	4
> 
> Are these macros always going to define 3 to be 3 and 4 to be 4. If so we
> probably don't need them (and they should be removed from patch 5/8 too).
> 
> There is a degree of nitpicking here however. The rest looks OK to me.

Really nitpicking, and I don't care much either way, but as natural
numbering would be 0-based, I'd keep the defines.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 181 bytes --]

^ permalink raw reply	[flat|nested] 33+ messages in thread

* Re: [PATCH V4 6/8] backlight: qcom-wled: Add support for WLED4 peripheral
  2018-07-20 21:21     ` Pavel Machek
@ 2018-07-23  6:16       ` kgunda
  0 siblings, 0 replies; 33+ messages in thread
From: kgunda @ 2018-07-23  6:16 UTC (permalink / raw)
  To: Pavel Machek
  Cc: Daniel Thompson, bjorn.andersson, jingoohan1, lee.jones,
	b.zolnierkie, dri-devel, jacek.anaszewski, robh+dt, mark.rutland,
	linux-leds, devicetree, linux-kernel, linux-fbdev, linux-arm-msm

On 2018-07-21 02:51, Pavel Machek wrote:
> Hi!
> 
>> >@@ -332,6 +529,7 @@ static u32 wled_values(const struct wled_var_cfg *cfg, u32 idx)
>> >  }
>> >  #define	WLED3	3
>> >+#define	WLED4	4
>> 
>> Are these macros always going to define 3 to be 3 and 4 to be 4. If so 
>> we
>> probably don't need them (and they should be removed from patch 5/8 
>> too).
>> 
>> There is a degree of nitpicking here however. The rest looks OK to me.
> 
> Really nitpicking, and I don't care much either way, but as natural
> numbering would be 0-based, I'd keep the defines.
> 									Pavel
Thanks Pavale/Daniel! I will remove the macros and use the number 3 and 
4 instead.

^ permalink raw reply	[flat|nested] 33+ messages in thread

* Re: [PATCH V4 6/8] backlight: qcom-wled: Add support for WLED4 peripheral
  2018-07-09 10:22 ` [PATCH V4 6/8] backlight: qcom-wled: Add support for WLED4 peripheral Kiran Gunda
  2018-07-20 13:47   ` Daniel Thompson
@ 2018-08-07  5:45   ` Bjorn Andersson
  1 sibling, 0 replies; 33+ messages in thread
From: Bjorn Andersson @ 2018-08-07  5:45 UTC (permalink / raw)
  To: Kiran Gunda
  Cc: jingoohan1, lee.jones, b.zolnierkie, dri-devel, daniel.thompson,
	jacek.anaszewski, pavel, robh+dt, mark.rutland, linux-leds,
	devicetree, linux-kernel, linux-fbdev, linux-arm-msm

On Mon 09 Jul 03:22 PDT 2018, Kiran Gunda wrote:

> WLED4 peripheral is present on some PMICs like pmi8998 and
> pm660l. It has a different register map and configurations
> are also different. Add support for it.
> 
> Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>

Regards,
Bjorn

> ---
> Changes from V3:
> 	- The WLED3 specific changes are splitted out
> 	- Merged the wled3_sync_toggle and wled4_syn_toggle functions
> 	- Modified the compatible .data
> 	- Moved from if/else to switch/case to select the version specific data
> 	- Addressed few more minor comments from Bjorn
> 
>  drivers/video/backlight/qcom-wled.c | 264 +++++++++++++++++++++++++++++++++++-
>  1 file changed, 258 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
> index 87fc1d0..362d254 100644
> --- a/drivers/video/backlight/qcom-wled.c
> +++ b/drivers/video/backlight/qcom-wled.c
> @@ -64,6 +64,28 @@
>  #define WLED3_SINK_REG_STR_CABC(n)			(0x66 + (n * 0x10))
>  #define  WLED3_SINK_REG_STR_CABC_MASK			BIT(7)
>  
> +/* WLED4 specific sink registers */
> +#define WLED4_SINK_REG_CURR_SINK			0x46
> +#define  WLED4_SINK_REG_CURR_SINK_MASK			GENMASK(7, 4)
> +#define  WLED4_SINK_REG_CURR_SINK_SHFT			4
> +
> +/* WLED4 specific per-'string' registers below */
> +#define WLED4_SINK_REG_STR_MOD_EN(n)			(0x50 + (n * 0x10))
> +#define  WLED4_SINK_REG_STR_MOD_MASK			BIT(7)
> +
> +#define WLED4_SINK_REG_STR_FULL_SCALE_CURR(n)		(0x52 + (n * 0x10))
> +#define  WLED4_SINK_REG_STR_FULL_SCALE_CURR_MASK	GENMASK(3, 0)
> +
> +#define WLED4_SINK_REG_STR_MOD_SRC(n)			(0x53 + (n * 0x10))
> +#define  WLED4_SINK_REG_STR_MOD_SRC_MASK		BIT(0)
> +#define  WLED4_SINK_REG_STR_MOD_SRC_INT			0x00
> +#define  WLED4_SINK_REG_STR_MOD_SRC_EXT			0x01
> +
> +#define WLED4_SINK_REG_STR_CABC(n)			(0x56 + (n * 0x10))
> +#define  WLED4_SINK_REG_STR_CABC_MASK			BIT(7)
> +
> +#define WLED4_SINK_REG_BRIGHT(n)			(0x57 + (n * 0x10))
> +
>  struct wled_var_cfg {
>  	const u32 *values;
>  	u32 (*fn)(u32);
> @@ -98,6 +120,7 @@ struct wled {
>  	struct device *dev;
>  	struct regmap *regmap;
>  	u16 ctrl_addr;
> +	u16 sink_addr;
>  	u16 max_string_count;
>  	u32 brightness;
>  	u32 max_brightness;
> @@ -124,6 +147,29 @@ static int wled3_set_brightness(struct wled *wled, u16 brightness)
>  	return 0;
>  }
>  
> +static int wled4_set_brightness(struct wled *wled, u16 brightness)
> +{
> +	int rc, i;
> +	u16 low_limit = wled->max_brightness * 4 / 1000;
> +	u8 v[2];
> +
> +	/* WLED4's lower limit of operation is 0.4% */
> +	if (brightness > 0 && brightness < low_limit)
> +		brightness = low_limit;
> +
> +	v[0] = brightness & 0xff;
> +	v[1] = (brightness >> 8) & 0xf;
> +
> +	for (i = 0;  i < wled->cfg.num_strings; ++i) {
> +		rc = regmap_bulk_write(wled->regmap, wled->sink_addr +
> +				       WLED4_SINK_REG_BRIGHT(i), v, 2);
> +		if (rc < 0)
> +			return rc;
> +	}
> +
> +	return 0;
> +}
> +
>  static int wled_module_enable(struct wled *wled, int val)
>  {
>  	int rc;
> @@ -141,13 +187,13 @@ static int wled_sync_toggle(struct wled *wled)
>  	unsigned int mask = GENMASK(wled->max_string_count - 1, 0);
>  
>  	rc = regmap_update_bits(wled->regmap,
> -				wled->ctrl_addr + WLED_SINK_REG_SYNC,
> +				wled->sink_addr + WLED_SINK_REG_SYNC,
>  				mask, mask);
>  	if (rc < 0)
>  		return rc;
>  
>  	rc = regmap_update_bits(wled->regmap,
> -				wled->ctrl_addr + WLED_SINK_REG_SYNC,
> +				wled->sink_addr + WLED_SINK_REG_SYNC,
>  				mask, WLED_SINK_REG_SYNC_CLEAR);
>  
>  	return rc;
> @@ -274,6 +320,120 @@ static int wled3_setup(struct wled *wled)
>  	.cabc = false,
>  };
>  
> +static int wled4_setup(struct wled *wled)
> +{
> +	int rc, temp, i, j;
> +	u16 addr;
> +	u8 sink_en = 0;
> +	u32 sink_cfg = 0;
> +
> +	rc = regmap_update_bits(wled->regmap,
> +				wled->ctrl_addr + WLED_CTRL_REG_OVP,
> +				WLED_CTRL_REG_OVP_MASK, wled->cfg.ovp);
> +	if (rc < 0)
> +		return rc;
> +
> +	rc = regmap_update_bits(wled->regmap,
> +				wled->ctrl_addr + WLED_CTRL_REG_ILIMIT,
> +				WLED_CTRL_REG_ILIMIT_MASK,
> +				wled->cfg.boost_i_limit);
> +	if (rc < 0)
> +		return rc;
> +
> +	rc = regmap_update_bits(wled->regmap,
> +				wled->ctrl_addr + WLED_CTRL_REG_FREQ,
> +				WLED_CTRL_REG_FREQ_MASK,
> +				wled->cfg.switch_freq);
> +	if (rc < 0)
> +		return rc;
> +
> +	rc = regmap_read(wled->regmap, wled->sink_addr +
> +			 WLED4_SINK_REG_CURR_SINK, &sink_cfg);
> +	if (rc < 0)
> +		return rc;
> +
> +	for (i = 0; i < wled->cfg.num_strings; i++) {
> +		j = wled->cfg.enabled_strings[i];
> +		temp = j + WLED4_SINK_REG_CURR_SINK_SHFT;
> +		sink_en |= 1 << temp;
> +	}
> +
> +	if (sink_cfg == sink_en)
> +		return 0;
> +
> +	rc = regmap_update_bits(wled->regmap,
> +				wled->sink_addr + WLED4_SINK_REG_CURR_SINK,
> +				WLED4_SINK_REG_CURR_SINK_MASK, 0);
> +	if (rc < 0)
> +		return rc;
> +
> +	rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
> +				WLED_CTRL_REG_MOD_EN,
> +				WLED_CTRL_REG_MOD_EN_MASK, 0);
> +	if (rc < 0)
> +		return rc;
> +
> +	/* Per sink/string configuration */
> +	for (i = 0; i < wled->cfg.num_strings; i++) {
> +		j = wled->cfg.enabled_strings[i];
> +
> +		addr = wled->sink_addr +
> +				WLED4_SINK_REG_STR_MOD_EN(j);
> +		rc = regmap_update_bits(wled->regmap, addr,
> +					WLED4_SINK_REG_STR_MOD_MASK,
> +					WLED4_SINK_REG_STR_MOD_MASK);
> +		if (rc < 0)
> +			return rc;
> +
> +		addr = wled->sink_addr +
> +				WLED4_SINK_REG_STR_FULL_SCALE_CURR(j);
> +		rc = regmap_update_bits(wled->regmap, addr,
> +					WLED4_SINK_REG_STR_FULL_SCALE_CURR_MASK,
> +					wled->cfg.string_i_limit);
> +		if (rc < 0)
> +			return rc;
> +
> +		addr = wled->sink_addr +
> +				WLED4_SINK_REG_STR_CABC(j);
> +		rc = regmap_update_bits(wled->regmap, addr,
> +					WLED4_SINK_REG_STR_CABC_MASK,
> +					wled->cfg.cabc ?
> +					WLED4_SINK_REG_STR_CABC_MASK : 0);
> +		if (rc < 0)
> +			return rc;
> +	}
> +
> +	rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
> +				WLED_CTRL_REG_MOD_EN,
> +				WLED_CTRL_REG_MOD_EN_MASK,
> +				WLED_CTRL_REG_MOD_EN_MASK);
> +	if (rc < 0)
> +		return rc;
> +
> +	rc = regmap_update_bits(wled->regmap,
> +				wled->sink_addr + WLED4_SINK_REG_CURR_SINK,
> +				WLED4_SINK_REG_CURR_SINK_MASK, sink_en);
> +	if (rc < 0)
> +		return rc;
> +
> +	rc = wled_sync_toggle(wled);
> +	if (rc < 0) {
> +		dev_err(wled->dev, "Failed to toggle sync reg rc:%d\n", rc);
> +		return rc;
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct wled_config wled4_config_defaults = {
> +	.boost_i_limit = 4,
> +	.string_i_limit = 10,
> +	.ovp = 1,
> +	.num_strings = 4,
> +	.switch_freq = 11,
> +	.cabc = false,
> +};
> +
>  static const u32 wled3_boost_i_limit_values[] = {
>  	105, 385, 525, 805, 980, 1260, 1400, 1680,
>  };
> @@ -283,6 +443,15 @@ static int wled3_setup(struct wled *wled)
>  	.size = ARRAY_SIZE(wled3_boost_i_limit_values),
>  };
>  
> +static const u32 wled4_boost_i_limit_values[] = {
> +	105, 280, 450, 620, 970, 1150, 1300, 1500,
> +};
> +
> +static const struct wled_var_cfg wled4_boost_i_limit_cfg = {
> +	.values = wled4_boost_i_limit_values,
> +	.size = ARRAY_SIZE(wled4_boost_i_limit_values),
> +};
> +
>  static const u32 wled3_ovp_values[] = {
>  	35, 32, 29, 27,
>  };
> @@ -292,6 +461,15 @@ static int wled3_setup(struct wled *wled)
>  	.size = ARRAY_SIZE(wled3_ovp_values),
>  };
>  
> +static const u32 wled4_ovp_values[] = {
> +	31100, 29600, 19600, 18100,
> +};
> +
> +static const struct wled_var_cfg wled4_ovp_cfg = {
> +	.values = wled4_ovp_values,
> +	.size = ARRAY_SIZE(wled4_ovp_values),
> +};
> +
>  static u32 wled3_num_strings_values_fn(u32 idx)
>  {
>  	return idx + 1;
> @@ -302,6 +480,11 @@ static u32 wled3_num_strings_values_fn(u32 idx)
>  	.size = 3,
>  };
>  
> +static const struct wled_var_cfg wled4_num_strings_cfg = {
> +	.fn = wled3_num_strings_values_fn,
> +	.size = 4,
> +};
> +
>  static u32 wled3_switch_freq_values_fn(u32 idx)
>  {
>  	return 19200 / (2 * (1 + idx));
> @@ -316,10 +499,24 @@ static u32 wled3_switch_freq_values_fn(u32 idx)
>  	.size = 26,
>  };
>  
> +static const u32 wled4_string_i_limit_values[] = {
> +	0, 2500, 5000, 7500, 10000, 12500, 15000, 17500, 20000,
> +	22500, 25000, 27500, 30000,
> +};
> +
> +static const struct wled_var_cfg wled4_string_i_limit_cfg = {
> +	.values = wled4_string_i_limit_values,
> +	.size = ARRAY_SIZE(wled4_string_i_limit_values),
> +};
> +
>  static const struct wled_var_cfg wled3_string_cfg = {
>  	.size = 8,
>  };
>  
> +static const struct wled_var_cfg wled4_string_cfg = {
> +	.size = 16,
> +};
> +
>  static u32 wled_values(const struct wled_var_cfg *cfg, u32 idx)
>  {
>  	if (idx >= cfg->size)
> @@ -332,6 +529,7 @@ static u32 wled_values(const struct wled_var_cfg *cfg, u32 idx)
>  }
>  
>  #define	WLED3	3
> +#define	WLED4	4
>  
>  static int wled_configure(struct wled *wled, int version)
>  {
> @@ -370,6 +568,34 @@ static int wled_configure(struct wled *wled, int version)
>  		},
>  	};
>  
> +	const struct wled_u32_opts wled4_opts[] = {
> +		{
> +			.name = "qcom,current-boost-limit",
> +			.val_ptr = &cfg->boost_i_limit,
> +			.cfg = &wled4_boost_i_limit_cfg,
> +		},
> +		{
> +			.name = "qcom,current-limit-microamp",
> +			.val_ptr = &cfg->string_i_limit,
> +			.cfg = &wled4_string_i_limit_cfg,
> +		},
> +		{
> +			.name = "qcom,ovp-millivolt",
> +			.val_ptr = &cfg->ovp,
> +			.cfg = &wled4_ovp_cfg,
> +		},
> +		{
> +			.name = "qcom,switching-freq",
> +			.val_ptr = &cfg->switch_freq,
> +			.cfg = &wled3_switch_freq_cfg,
> +		},
> +		{
> +			.name = "qcom,num-strings",
> +			.val_ptr = &cfg->num_strings,
> +			.cfg = &wled4_num_strings_cfg,
> +		},
> +	};
> +
>  	const struct wled_bool_opts bool_opts[] = {
>  		{ "qcom,cs-out", &cfg->cs_out_en, },
>  		{ "qcom,ext-gen", &cfg->ext_gen, },
> @@ -383,10 +609,6 @@ static int wled_configure(struct wled *wled, int version)
>  	}
>  	wled->ctrl_addr = be32_to_cpu(*prop_addr);
>  
> -	rc = of_property_read_string(dev->of_node, "label", &wled->name);
> -	if (rc)
> -		wled->name = dev->of_node->name;
> -
>  	switch (version) {
>  	case WLED3:
>  		u32_opts = wled3_opts;
> @@ -394,6 +616,22 @@ static int wled_configure(struct wled *wled, int version)
>  		*cfg = wled3_config_defaults;
>  		wled->wled_set_brightness = wled3_set_brightness;
>  		wled->max_string_count = 3;
> +		wled->sink_addr = wled->ctrl_addr;
> +		break;
> +
> +	case WLED4:
> +		u32_opts = wled4_opts;
> +		size = ARRAY_SIZE(wled4_opts);
> +		*cfg = wled4_config_defaults;
> +		wled->wled_set_brightness = wled4_set_brightness;
> +		wled->max_string_count = 4;
> +
> +		prop_addr = of_get_address(dev->of_node, 1, NULL, NULL);
> +		if (!prop_addr) {
> +			dev_err(wled->dev, "invalid IO resources\n");
> +			return -EINVAL;
> +		}
> +		wled->sink_addr = be32_to_cpu(*prop_addr);
>  		break;
>  
>  	default:
> @@ -401,6 +639,10 @@ static int wled_configure(struct wled *wled, int version)
>  		break;
>  	}
>  
> +	rc = of_property_read_string(dev->of_node, "label", &wled->name);
> +	if (rc)
> +		wled->name = dev->of_node->name;
> +
>  	for (i = 0; i < size; ++i) {
>  		rc = of_property_read_u32(dev->of_node, u32_opts[i].name, &val);
>  		if (rc == -EINVAL) {
> @@ -492,6 +734,14 @@ static int wled_probe(struct platform_device *pdev)
>  		}
>  		break;
>  
> +	case WLED4:
> +		rc = wled4_setup(wled);
> +		if (rc) {
> +			dev_err(&pdev->dev, "wled4_setup failed\n");
> +			return rc;
> +		}
> +		break;
> +
>  	default:
>  		dev_err(wled->dev, "Invalid WLED version\n");
>  		break;
> @@ -512,6 +762,8 @@ static int wled_probe(struct platform_device *pdev)
>  
>  static const struct of_device_id wled_match_table[] = {
>  	{ .compatible = "qcom,pm8941-wled", .data = (void *)3 },
> +	{ .compatible = "qcom,pmi8998-wled", .data = (void *)4 },
> +	{ .compatible = "qcom,pm660l-wled", .data = (void *)4 },
>  	{}
>  };
>  MODULE_DEVICE_TABLE(of, wled_match_table);
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
>  a Linux Foundation Collaborative Project
> 

^ permalink raw reply	[flat|nested] 33+ messages in thread

* [PATCH V4 7/8] backlight: qcom-wled: add support for short circuit handling
  2018-07-09 10:22 [PATCH V4 0/8] backlight: qcom-wled: Support for QCOM wled driver Kiran Gunda
                   ` (5 preceding siblings ...)
  2018-07-09 10:22 ` [PATCH V4 6/8] backlight: qcom-wled: Add support for WLED4 peripheral Kiran Gunda
@ 2018-07-09 10:22 ` Kiran Gunda
  2018-07-20 14:07   ` Daniel Thompson
  2018-07-09 10:22 ` [PATCH V4 8/8] backlight: qcom-wled: Add auto string detection logic Kiran Gunda
  2018-08-03  7:19 ` [PATCH V4 0/8] backlight: qcom-wled: Support for QCOM wled driver kgunda
  8 siblings, 1 reply; 33+ messages in thread
From: Kiran Gunda @ 2018-07-09 10:22 UTC (permalink / raw)
  To: bjorn.andersson, jingoohan1, lee.jones, b.zolnierkie, dri-devel,
	daniel.thompson, jacek.anaszewski, pavel, robh+dt, mark.rutland,
	linux-leds, devicetree, linux-kernel, linux-fbdev
  Cc: linux-arm-msm, Kiran Gunda

Handle the short circuit interrupt and check if the short circuit
interrupt is valid. Re-enable the module to check if it goes
away. Disable the module altogether if the short circuit event
persists.

Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
Changes from V3:
	- Added Reviewed by tag.
	- Addressed minor comments from Vinod

 drivers/video/backlight/qcom-wled.c | 132 ++++++++++++++++++++++++++++++++++--
 1 file changed, 128 insertions(+), 4 deletions(-)

diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
index 362d254..a14f1a6 100644
--- a/drivers/video/backlight/qcom-wled.c
+++ b/drivers/video/backlight/qcom-wled.c
@@ -10,6 +10,9 @@
  * GNU General Public License for more details.
  */
 
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/ktime.h>
 #include <linux/kernel.h>
 #include <linux/backlight.h>
 #include <linux/module.h>
@@ -64,6 +67,16 @@
 #define WLED3_SINK_REG_STR_CABC(n)			(0x66 + (n * 0x10))
 #define  WLED3_SINK_REG_STR_CABC_MASK			BIT(7)
 
+/* WLED4 specific control registers */
+#define WLED4_CTRL_REG_SHORT_PROTECT			0x5e
+#define  WLED4_CTRL_REG_SHORT_EN_MASK			BIT(7)
+
+#define WLED4_CTRL_REG_SEC_ACCESS			0xd0
+#define  WLED4_CTRL_REG_SEC_UNLOCK			0xa5
+
+#define WLED4_CTRL_REG_TEST1				0xe2
+#define  WLED4_CTRL_REG_TEST1_EXT_FET_DTEST2		0x09
+
 /* WLED4 specific sink registers */
 #define WLED4_SINK_REG_CURR_SINK			0x46
 #define  WLED4_SINK_REG_CURR_SINK_MASK			GENMASK(7, 4)
@@ -113,17 +126,23 @@ struct wled_config {
 	bool cs_out_en;
 	bool ext_gen;
 	bool cabc;
+	bool external_pfet;
 };
 
 struct wled {
 	const char *name;
 	struct device *dev;
 	struct regmap *regmap;
+	struct mutex lock;	/* Lock to avoid race from thread irq handler */
+	ktime_t last_short_event;
 	u16 ctrl_addr;
 	u16 sink_addr;
 	u16 max_string_count;
 	u32 brightness;
 	u32 max_brightness;
+	u32 short_count;
+	bool disabled_by_short;
+	bool has_short_detect;
 
 	struct wled_config cfg;
 	int (*wled_set_brightness)(struct wled *wled, u16 brightness);
@@ -174,6 +193,9 @@ static int wled_module_enable(struct wled *wled, int val)
 {
 	int rc;
 
+	if (wled->disabled_by_short)
+		return -EFAULT;
+
 	rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
 				WLED_CTRL_REG_MOD_EN,
 				WLED_CTRL_REG_MOD_EN_MASK,
@@ -210,18 +232,19 @@ static int wled_update_status(struct backlight_device *bl)
 	    bl->props.state & BL_CORE_FBBLANK)
 		brightness = 0;
 
+	mutex_lock(&wled->lock);
 	if (brightness) {
 		rc = wled->wled_set_brightness(wled, brightness);
 		if (rc < 0) {
 			dev_err(wled->dev, "wled failed to set brightness rc:%d\n",
 				rc);
-			return rc;
+			goto unlock_mutex;
 		}
 
 		rc = wled_sync_toggle(wled);
 		if (rc < 0) {
 			dev_err(wled->dev, "wled sync failed rc:%d\n", rc);
-			return rc;
+			goto unlock_mutex;
 		}
 	}
 
@@ -229,15 +252,61 @@ static int wled_update_status(struct backlight_device *bl)
 		rc = wled_module_enable(wled, !!brightness);
 		if (rc < 0) {
 			dev_err(wled->dev, "wled enable failed rc:%d\n", rc);
-			return rc;
+			goto unlock_mutex;
 		}
 	}
 
 	wled->brightness = brightness;
 
+unlock_mutex:
+	mutex_unlock(&wled->lock);
+
 	return rc;
 }
 
+#define WLED_SHORT_DLY_MS			20
+#define WLED_SHORT_CNT_MAX			5
+#define WLED_SHORT_RESET_CNT_DLY_US		USEC_PER_SEC
+
+static irqreturn_t wled_short_irq_handler(int irq, void *_wled)
+{
+	struct wled *wled = _wled;
+	int rc;
+	s64 elapsed_time;
+
+	wled->short_count++;
+	mutex_lock(&wled->lock);
+	rc = wled_module_enable(wled, false);
+	if (rc < 0) {
+		dev_err(wled->dev, "wled disable failed rc:%d\n", rc);
+		goto unlock_mutex;
+	}
+
+	elapsed_time = ktime_us_delta(ktime_get(),
+				      wled->last_short_event);
+	if (elapsed_time > WLED_SHORT_RESET_CNT_DLY_US)
+		wled->short_count = 0;
+
+	if (wled->short_count > WLED_SHORT_CNT_MAX) {
+		dev_err(wled->dev, "Short trigged %d times, disabling WLED forever!\n",
+			wled->short_count);
+		wled->disabled_by_short = true;
+		goto unlock_mutex;
+	}
+
+	wled->last_short_event = ktime_get();
+
+	msleep(WLED_SHORT_DLY_MS);
+	rc = wled_module_enable(wled, true);
+	if (rc < 0)
+		dev_err(wled->dev, "wled enable failed rc:%d\n", rc);
+
+unlock_mutex:
+	mutex_unlock(&wled->lock);
+
+	return IRQ_HANDLED;
+}
+
 static int wled3_setup(struct wled *wled)
 {
 	u16 addr;
@@ -325,7 +394,7 @@ static int wled4_setup(struct wled *wled)
 	int rc, temp, i, j;
 	u16 addr;
 	u8 sink_en = 0;
-	u32 sink_cfg = 0;
+	u32 sink_cfg;
 
 	rc = regmap_update_bits(wled->regmap,
 				wled->ctrl_addr + WLED_CTRL_REG_OVP,
@@ -347,6 +416,21 @@ static int wled4_setup(struct wled *wled)
 	if (rc < 0)
 		return rc;
 
+	if (wled->cfg.external_pfet) {
+		/* Unlock the secure register access */
+		rc = regmap_write(wled->regmap, wled->ctrl_addr +
+				  WLED4_CTRL_REG_SEC_ACCESS,
+				  WLED4_CTRL_REG_SEC_UNLOCK);
+		if (rc < 0)
+			return rc;
+
+		rc = regmap_write(wled->regmap,
+				  wled->ctrl_addr + WLED4_CTRL_REG_TEST1,
+				  WLED4_CTRL_REG_TEST1_EXT_FET_DTEST2);
+		if (rc < 0)
+			return rc;
+	}
+
 	rc = regmap_read(wled->regmap, wled->sink_addr +
 			 WLED4_SINK_REG_CURR_SINK, &sink_cfg);
 	if (rc < 0)
@@ -432,6 +516,7 @@ static int wled4_setup(struct wled *wled)
 	.num_strings = 4,
 	.switch_freq = 11,
 	.cabc = false,
+	.external_pfet = false,
 };
 
 static const u32 wled3_boost_i_limit_values[] = {
@@ -600,6 +685,7 @@ static int wled_configure(struct wled *wled, int version)
 		{ "qcom,cs-out", &cfg->cs_out_en, },
 		{ "qcom,ext-gen", &cfg->ext_gen, },
 		{ "qcom,cabc", &cfg->cabc, },
+		{ "qcom,external-pfet", &cfg->external_pfet, },
 	};
 
 	prop_addr = of_get_address(dev->of_node, 0, NULL, NULL);
@@ -688,6 +774,38 @@ static int wled_configure(struct wled *wled, int version)
 	return 0;
 }
 
+static int wled_configure_short_irq(struct wled *wled,
+				    struct platform_device *pdev)
+{
+	int rc, short_irq;
+
+	if (!wled->has_short_detect)
+		return 0;
+
+	rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
+				WLED4_CTRL_REG_SHORT_PROTECT,
+				WLED4_CTRL_REG_SHORT_EN_MASK,
+				WLED4_CTRL_REG_SHORT_EN_MASK);
+	if (rc < 0)
+		return rc;
+
+	short_irq = platform_get_irq_byname(pdev, "short");
+	if (short_irq < 0) {
+		dev_dbg(&pdev->dev, "short irq is not used\n");
+		return 0;
+	}
+
+	rc = devm_request_threaded_irq(wled->dev, short_irq,
+				       NULL, wled_short_irq_handler,
+				       IRQF_ONESHOT,
+				       "wled_short_irq", wled);
+	if (rc < 0)
+		dev_err(wled->dev, "Unable to request short_irq (err:%d)\n",
+			rc);
+
+	return rc;
+}
+
 static const struct backlight_ops wled_ops = {
 	.update_status = wled_update_status,
 };
@@ -721,6 +839,7 @@ static int wled_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
+	mutex_init(&wled->lock);
 	rc = wled_configure(wled, version);
 	if (rc)
 		return rc;
@@ -735,6 +854,7 @@ static int wled_probe(struct platform_device *pdev)
 		break;
 
 	case WLED4:
+		wled->has_short_detect = true;
 		rc = wled4_setup(wled);
 		if (rc) {
 			dev_err(&pdev->dev, "wled4_setup failed\n");
@@ -747,6 +867,10 @@ static int wled_probe(struct platform_device *pdev)
 		break;
 	}
 
+	rc = wled_configure_short_irq(wled, pdev);
+	if (rc < 0)
+		return rc;
+
 	val = WLED_DEFAULT_BRIGHTNESS;
 	of_property_read_u32(pdev->dev.of_node, "default-brightness", &val);
 
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
 a Linux Foundation Collaborative Project


^ permalink raw reply related	[flat|nested] 33+ messages in thread

* Re: [PATCH V4 7/8] backlight: qcom-wled: add support for short circuit handling
  2018-07-09 10:22 ` [PATCH V4 7/8] backlight: qcom-wled: add support for short circuit handling Kiran Gunda
@ 2018-07-20 14:07   ` Daniel Thompson
  2018-07-23  6:05     ` kgunda
  0 siblings, 1 reply; 33+ messages in thread
From: Daniel Thompson @ 2018-07-20 14:07 UTC (permalink / raw)
  To: Kiran Gunda, bjorn.andersson, jingoohan1, lee.jones,
	b.zolnierkie, dri-devel, jacek.anaszewski, pavel, robh+dt,
	mark.rutland, linux-leds, devicetree, linux-kernel, linux-fbdev
  Cc: linux-arm-msm

On 09/07/18 11:22, Kiran Gunda wrote:
> Handle the short circuit interrupt and check if the short circuit
> interrupt is valid. Re-enable the module to check if it goes
> away. Disable the module altogether if the short circuit event
> persists.
> 
> Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---
> Changes from V3:
> 	- Added Reviewed by tag.
> 	- Addressed minor comments from Vinod
> 
>   drivers/video/backlight/qcom-wled.c | 132 ++++++++++++++++++++++++++++++++++--
>   1 file changed, 128 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
> index 362d254..a14f1a6 100644
> --- a/drivers/video/backlight/qcom-wled.c
> +++ b/drivers/video/backlight/qcom-wled.c
> @@ -10,6 +10,9 @@
>    * GNU General Public License for more details.
>    */
>   
> +#include <linux/delay.h>
> +#include <linux/interrupt.h>
> +#include <linux/ktime.h>
>   #include <linux/kernel.h>
>   #include <linux/backlight.h>
>   #include <linux/module.h>
> @@ -64,6 +67,16 @@
>   #define WLED3_SINK_REG_STR_CABC(n)			(0x66 + (n * 0x10))
>   #define  WLED3_SINK_REG_STR_CABC_MASK			BIT(7)
>   
> +/* WLED4 specific control registers */
> +#define WLED4_CTRL_REG_SHORT_PROTECT			0x5e
> +#define  WLED4_CTRL_REG_SHORT_EN_MASK			BIT(7)
> +
> +#define WLED4_CTRL_REG_SEC_ACCESS			0xd0
> +#define  WLED4_CTRL_REG_SEC_UNLOCK			0xa5
> +
> +#define WLED4_CTRL_REG_TEST1				0xe2
> +#define  WLED4_CTRL_REG_TEST1_EXT_FET_DTEST2		0x09
> +
>   /* WLED4 specific sink registers */
>   #define WLED4_SINK_REG_CURR_SINK			0x46
>   #define  WLED4_SINK_REG_CURR_SINK_MASK			GENMASK(7, 4)
> @@ -113,17 +126,23 @@ struct wled_config {
>   	bool cs_out_en;
>   	bool ext_gen;
>   	bool cabc;
> +	bool external_pfet;
>   };
>   
>   struct wled {
>   	const char *name;
>   	struct device *dev;
>   	struct regmap *regmap;
> +	struct mutex lock;	/* Lock to avoid race from thread irq handler */
> +	ktime_t last_short_event;
>   	u16 ctrl_addr;
>   	u16 sink_addr;
>   	u16 max_string_count;
>   	u32 brightness;
>   	u32 max_brightness;
> +	u32 short_count;
> +	bool disabled_by_short;
> +	bool has_short_detect;
>   
>   	struct wled_config cfg;
>   	int (*wled_set_brightness)(struct wled *wled, u16 brightness);
> @@ -174,6 +193,9 @@ static int wled_module_enable(struct wled *wled, int val)
>   {
>   	int rc;
>   
> +	if (wled->disabled_by_short)
> +		return -EFAULT;

EFAULT means bad address (memory fault). Perhaps EIO or maybe even 
something more exotic like ENXIO might be more appropriate?


> +
>   	rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
>   				WLED_CTRL_REG_MOD_EN,
>   				WLED_CTRL_REG_MOD_EN_MASK,
> @@ -210,18 +232,19 @@ static int wled_update_status(struct backlight_device *bl)
>   	    bl->props.state & BL_CORE_FBBLANK)
>   		brightness = 0;
>   
> +	mutex_lock(&wled->lock);
>   	if (brightness) {
>   		rc = wled->wled_set_brightness(wled, brightness);
>   		if (rc < 0) {
>   			dev_err(wled->dev, "wled failed to set brightness rc:%d\n",
>   				rc);
> -			return rc;
> +			goto unlock_mutex;
>   		}
>   
>   		rc = wled_sync_toggle(wled);
>   		if (rc < 0) {
>   			dev_err(wled->dev, "wled sync failed rc:%d\n", rc);
> -			return rc;
> +			goto unlock_mutex;
>   		}
>   	}
>   
> @@ -229,15 +252,61 @@ static int wled_update_status(struct backlight_device *bl)
>   		rc = wled_module_enable(wled, !!brightness);
>   		if (rc < 0) {
>   			dev_err(wled->dev, "wled enable failed rc:%d\n", rc);
> -			return rc;
> +			goto unlock_mutex;
>   		}
>   	}
>   
>   	wled->brightness = brightness;
>   
> +unlock_mutex:
> +	mutex_unlock(&wled->lock);
> +
>   	return rc;
>   }
>   
> +#define WLED_SHORT_DLY_MS			20
> +#define WLED_SHORT_CNT_MAX			5
> +#define WLED_SHORT_RESET_CNT_DLY_US		USEC_PER_SEC
> +
> +static irqreturn_t wled_short_irq_handler(int irq, void *_wled)
> +{
> +	struct wled *wled = _wled;
> +	int rc;
> +	s64 elapsed_time;
> +
> +	wled->short_count++;
> +	mutex_lock(&wled->lock);
> +	rc = wled_module_enable(wled, false);
> +	if (rc < 0) {
> +		dev_err(wled->dev, "wled disable failed rc:%d\n", rc);
> +		goto unlock_mutex;
> +	}
> +
> +	elapsed_time = ktime_us_delta(ktime_get(),
> +				      wled->last_short_event);
> +	if (elapsed_time > WLED_SHORT_RESET_CNT_DLY_US)
> +		wled->short_count = 0;

Shouldn't this reset to 1 (e.g. we have just seen a short).


Daniel.

^ permalink raw reply	[flat|nested] 33+ messages in thread

* Re: [PATCH V4 7/8] backlight: qcom-wled: add support for short circuit handling
  2018-07-20 14:07   ` Daniel Thompson
@ 2018-07-23  6:05     ` kgunda
  0 siblings, 0 replies; 33+ messages in thread
From: kgunda @ 2018-07-23  6:05 UTC (permalink / raw)
  To: Daniel Thompson
  Cc: bjorn.andersson, jingoohan1, lee.jones, b.zolnierkie, dri-devel,
	jacek.anaszewski, pavel, robh+dt, mark.rutland, linux-leds,
	devicetree, linux-kernel, linux-fbdev, linux-arm-msm

On 2018-07-20 19:37, Daniel Thompson wrote:
> On 09/07/18 11:22, Kiran Gunda wrote:
>> Handle the short circuit interrupt and check if the short circuit
>> interrupt is valid. Re-enable the module to check if it goes
>> away. Disable the module altogether if the short circuit event
>> persists.
>> 
>> Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
>> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
>> ---
>> Changes from V3:
>> 	- Added Reviewed by tag.
>> 	- Addressed minor comments from Vinod
>> 
>>   drivers/video/backlight/qcom-wled.c | 132 
>> ++++++++++++++++++++++++++++++++++--
>>   1 file changed, 128 insertions(+), 4 deletions(-)
>> 
>> diff --git a/drivers/video/backlight/qcom-wled.c 
>> b/drivers/video/backlight/qcom-wled.c
>> index 362d254..a14f1a6 100644
>> --- a/drivers/video/backlight/qcom-wled.c
>> +++ b/drivers/video/backlight/qcom-wled.c
>> @@ -10,6 +10,9 @@
>>    * GNU General Public License for more details.
>>    */
>>   +#include <linux/delay.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/ktime.h>
>>   #include <linux/kernel.h>
>>   #include <linux/backlight.h>
>>   #include <linux/module.h>
>> @@ -64,6 +67,16 @@
>>   #define WLED3_SINK_REG_STR_CABC(n)			(0x66 + (n * 0x10))
>>   #define  WLED3_SINK_REG_STR_CABC_MASK			BIT(7)
>>   +/* WLED4 specific control registers */
>> +#define WLED4_CTRL_REG_SHORT_PROTECT			0x5e
>> +#define  WLED4_CTRL_REG_SHORT_EN_MASK			BIT(7)
>> +
>> +#define WLED4_CTRL_REG_SEC_ACCESS			0xd0
>> +#define  WLED4_CTRL_REG_SEC_UNLOCK			0xa5
>> +
>> +#define WLED4_CTRL_REG_TEST1				0xe2
>> +#define  WLED4_CTRL_REG_TEST1_EXT_FET_DTEST2		0x09
>> +
>>   /* WLED4 specific sink registers */
>>   #define WLED4_SINK_REG_CURR_SINK			0x46
>>   #define  WLED4_SINK_REG_CURR_SINK_MASK			GENMASK(7, 4)
>> @@ -113,17 +126,23 @@ struct wled_config {
>>   	bool cs_out_en;
>>   	bool ext_gen;
>>   	bool cabc;
>> +	bool external_pfet;
>>   };
>>     struct wled {
>>   	const char *name;
>>   	struct device *dev;
>>   	struct regmap *regmap;
>> +	struct mutex lock;	/* Lock to avoid race from thread irq handler */
>> +	ktime_t last_short_event;
>>   	u16 ctrl_addr;
>>   	u16 sink_addr;
>>   	u16 max_string_count;
>>   	u32 brightness;
>>   	u32 max_brightness;
>> +	u32 short_count;
>> +	bool disabled_by_short;
>> +	bool has_short_detect;
>>     	struct wled_config cfg;
>>   	int (*wled_set_brightness)(struct wled *wled, u16 brightness);
>> @@ -174,6 +193,9 @@ static int wled_module_enable(struct wled *wled, 
>> int val)
>>   {
>>   	int rc;
>>   +	if (wled->disabled_by_short)
>> +		return -EFAULT;
> 
> EFAULT means bad address (memory fault). Perhaps EIO or maybe even
> something more exotic like ENXIO might be more appropriate?
> 
> 
>> +
>>   	rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
>>   				WLED_CTRL_REG_MOD_EN,
>>   				WLED_CTRL_REG_MOD_EN_MASK,
>> @@ -210,18 +232,19 @@ static int wled_update_status(struct 
>> backlight_device *bl)
>>   	    bl->props.state & BL_CORE_FBBLANK)
>>   		brightness = 0;
>>   +	mutex_lock(&wled->lock);
>>   	if (brightness) {
>>   		rc = wled->wled_set_brightness(wled, brightness);
>>   		if (rc < 0) {
>>   			dev_err(wled->dev, "wled failed to set brightness rc:%d\n",
>>   				rc);
>> -			return rc;
>> +			goto unlock_mutex;
>>   		}
>>     		rc = wled_sync_toggle(wled);
>>   		if (rc < 0) {
>>   			dev_err(wled->dev, "wled sync failed rc:%d\n", rc);
>> -			return rc;
>> +			goto unlock_mutex;
>>   		}
>>   	}
>>   @@ -229,15 +252,61 @@ static int wled_update_status(struct 
>> backlight_device *bl)
>>   		rc = wled_module_enable(wled, !!brightness);
>>   		if (rc < 0) {
>>   			dev_err(wled->dev, "wled enable failed rc:%d\n", rc);
>> -			return rc;
>> +			goto unlock_mutex;
>>   		}
>>   	}
>>     	wled->brightness = brightness;
>>   +unlock_mutex:
>> +	mutex_unlock(&wled->lock);
>> +
>>   	return rc;
>>   }
>>   +#define WLED_SHORT_DLY_MS			20
>> +#define WLED_SHORT_CNT_MAX			5
>> +#define WLED_SHORT_RESET_CNT_DLY_US		USEC_PER_SEC
>> +
>> +static irqreturn_t wled_short_irq_handler(int irq, void *_wled)
>> +{
>> +	struct wled *wled = _wled;
>> +	int rc;
>> +	s64 elapsed_time;
>> +
>> +	wled->short_count++;
>> +	mutex_lock(&wled->lock);
>> +	rc = wled_module_enable(wled, false);
>> +	if (rc < 0) {
>> +		dev_err(wled->dev, "wled disable failed rc:%d\n", rc);
>> +		goto unlock_mutex;
>> +	}
>> +
>> +	elapsed_time = ktime_us_delta(ktime_get(),
>> +				      wled->last_short_event);
>> +	if (elapsed_time > WLED_SHORT_RESET_CNT_DLY_US)
>> +		wled->short_count = 0;
> 
> Shouldn't this reset to 1 (e.g. we have just seen a short).
> 
> 
> Daniel.
Ok. I will change it in the next series.

^ permalink raw reply	[flat|nested] 33+ messages in thread

* [PATCH V4 8/8] backlight: qcom-wled: Add auto string detection logic
  2018-07-09 10:22 [PATCH V4 0/8] backlight: qcom-wled: Support for QCOM wled driver Kiran Gunda
                   ` (6 preceding siblings ...)
  2018-07-09 10:22 ` [PATCH V4 7/8] backlight: qcom-wled: add support for short circuit handling Kiran Gunda
@ 2018-07-09 10:22 ` Kiran Gunda
  2018-08-07  6:32   ` Bjorn Andersson
  2018-08-03  7:19 ` [PATCH V4 0/8] backlight: qcom-wled: Support for QCOM wled driver kgunda
  8 siblings, 1 reply; 33+ messages in thread
From: Kiran Gunda @ 2018-07-09 10:22 UTC (permalink / raw)
  To: bjorn.andersson, jingoohan1, lee.jones, b.zolnierkie, dri-devel,
	daniel.thompson, jacek.anaszewski, pavel, robh+dt, mark.rutland,
	linux-leds, devicetree, linux-kernel, linux-fbdev
  Cc: linux-arm-msm, Kiran Gunda

The auto string detection algorithm checks if the current WLED
sink configuration is valid. It tries enabling every sink and
checks if the OVP fault is observed. Based on this information
it detects and enables the valid sink configuration.
Auto calibration will be triggered when the OVP fault interrupts
are seen frequently thereby it tries to fix the sink configuration.

The auto-detection also kicks in when the connected LED string
of the display-backlight malfunctions (because of damage) and
requires the damaged string to be turned off to prevent the
complete panel and/or board from being damaged.

Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
---
Changes from V3:
	- Optimized the wled_ovp_work
	- pr_err/pr_dbg to dev_err/dev_dbg
	- removed un-necessary variable initializations
	- Addressed few other comments from Bjorn 

 drivers/video/backlight/qcom-wled.c | 402 +++++++++++++++++++++++++++++++++++-
 1 file changed, 397 insertions(+), 5 deletions(-)

diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
index a14f1a6..b7d4fae 100644
--- a/drivers/video/backlight/qcom-wled.c
+++ b/drivers/video/backlight/qcom-wled.c
@@ -25,10 +25,18 @@
 #define WLED_MAX_STRINGS				4
 
 #define WLED_DEFAULT_BRIGHTNESS				2048
-
+#define WLED_SOFT_START_DLY_US				10000
 #define WLED_SINK_REG_BRIGHT_MAX			0xFFF
 
 /* WLED control registers */
+#define WLED_CTRL_REG_FAULT_STATUS			0x08
+#define  WLED_CTRL_REG_ILIM_FAULT_BIT			BIT(0)
+#define  WLED_CTRL_REG_OVP_FAULT_BIT			BIT(1)
+#define  WLED4_CTRL_REG_SC_FAULT_BIT			BIT(2)
+
+#define WLED_CTRL_REG_INT_RT_STS			0x10
+#define  WLED_CTRL_REG_OVP_FAULT_STATUS			BIT(1)
+
 #define WLED_CTRL_REG_MOD_EN				0x46
 #define  WLED_CTRL_REG_MOD_EN_MASK			BIT(7)
 #define  WLED_CTRL_REG_MOD_EN_SHIFT			7
@@ -36,6 +44,8 @@
 #define WLED_CTRL_REG_FREQ				0x4c
 #define  WLED_CTRL_REG_FREQ_MASK			GENMASK(3, 0)
 
+#define WLED_CTRL_REG_FEEDBACK_CONTROL			0x48
+
 #define WLED_CTRL_REG_OVP				0x4d
 #define  WLED_CTRL_REG_OVP_MASK				GENMASK(1, 0)
 
@@ -127,6 +137,7 @@ struct wled_config {
 	bool ext_gen;
 	bool cabc;
 	bool external_pfet;
+	bool auto_detection_enabled;
 };
 
 struct wled {
@@ -135,16 +146,22 @@ struct wled {
 	struct regmap *regmap;
 	struct mutex lock;	/* Lock to avoid race from thread irq handler */
 	ktime_t last_short_event;
+	ktime_t start_ovp_fault_time;
 	u16 ctrl_addr;
 	u16 sink_addr;
 	u16 max_string_count;
+	u16 auto_detection_ovp_count;
 	u32 brightness;
 	u32 max_brightness;
 	u32 short_count;
+	u32 auto_detect_count;
 	bool disabled_by_short;
 	bool has_short_detect;
+	int ovp_irq;
+	bool ovp_irq_disabled;
 
 	struct wled_config cfg;
+	struct delayed_work ovp_work;
 	int (*wled_set_brightness)(struct wled *wled, u16 brightness);
 };
 
@@ -189,6 +206,15 @@ static int wled4_set_brightness(struct wled *wled, u16 brightness)
 	return 0;
 }
 
+static void wled_ovp_work(struct work_struct *work)
+{
+	struct wled *wled = container_of(work,
+					 struct wled, ovp_work.work);
+
+	if (wled->ovp_irq > 0)
+		enable_irq(wled->ovp_irq);
+}
+
 static int wled_module_enable(struct wled *wled, int val)
 {
 	int rc;
@@ -200,7 +226,18 @@ static int wled_module_enable(struct wled *wled, int val)
 				WLED_CTRL_REG_MOD_EN,
 				WLED_CTRL_REG_MOD_EN_MASK,
 				val << WLED_CTRL_REG_MOD_EN_SHIFT);
-	return rc;
+	if (rc < 0)
+		return rc;
+
+	if (val) {
+		schedule_delayed_work(&wled->ovp_work, WLED_SOFT_START_DLY_US);
+	} else {
+		cancel_delayed_work_sync(&wled->ovp_work);
+		if (wled->ovp_irq > 0)
+			disable_irq(wled->ovp_irq);
+	}
+
+	return 0;
 }
 
 static int wled_sync_toggle(struct wled *wled)
@@ -307,6 +344,312 @@ static irqreturn_t wled_short_irq_handler(int irq, void *_wled)
 	return IRQ_HANDLED;
 }
 
+#define AUTO_DETECT_BRIGHTNESS		200
+
+static void wled_auto_string_detection(struct wled *wled)
+{
+	int rc = 0, i;
+	u32 sink_config = 0, int_sts;
+	u8 sink_test = 0, sink_valid = 0, val;
+
+	/* read configured sink configuration */
+	rc = regmap_read(wled->regmap, wled->sink_addr +
+			 WLED4_SINK_REG_CURR_SINK, &sink_config);
+	if (rc < 0) {
+		dev_err(wled->dev, "Failed to read SINK configuration rc=%d\n",
+			rc);
+		goto failed_detect;
+	}
+
+	/* disable the module before starting detection */
+	rc = regmap_update_bits(wled->regmap,
+				wled->ctrl_addr + WLED_CTRL_REG_MOD_EN,
+				WLED_CTRL_REG_MOD_EN_MASK, 0);
+	if (rc < 0) {
+		dev_err(wled->dev, "Failed to disable WLED module rc=%d\n", rc);
+		goto failed_detect;
+	}
+
+	/* set low brightness across all sinks */
+	rc = wled4_set_brightness(wled, AUTO_DETECT_BRIGHTNESS);
+	if (rc < 0) {
+		dev_err(wled->dev, "Failed to set brightness for auto detection rc=%d\n",
+			rc);
+		goto failed_detect;
+	}
+
+	if (wled->cfg.cabc) {
+		for (i = 0; i < wled->cfg.num_strings; i++) {
+			rc = regmap_update_bits(wled->regmap, wled->sink_addr +
+						WLED4_SINK_REG_STR_CABC(i),
+						WLED4_SINK_REG_STR_CABC_MASK,
+						0);
+			if (rc < 0)
+				goto failed_detect;
+		}
+	}
+
+	/* disable all sinks */
+	rc = regmap_write(wled->regmap,
+			  wled->sink_addr + WLED4_SINK_REG_CURR_SINK, 0);
+	if (rc < 0) {
+		dev_err(wled->dev, "Failed to disable all sinks rc=%d\n", rc);
+		goto failed_detect;
+	}
+
+	/* iterate through the strings one by one */
+	for (i = 0; i < wled->cfg.num_strings; i++) {
+		sink_test = BIT((WLED4_SINK_REG_CURR_SINK_SHFT + i));
+
+		/* Enable feedback control */
+		rc = regmap_write(wled->regmap, wled->ctrl_addr +
+				  WLED_CTRL_REG_FEEDBACK_CONTROL, i + 1);
+		if (rc < 0) {
+			dev_err(wled->dev, "Failed to enable feedback for SINK %d rc = %d\n",
+				i + 1, rc);
+			goto failed_detect;
+		}
+
+		/* enable the sink */
+		rc = regmap_write(wled->regmap, wled->sink_addr +
+				  WLED4_SINK_REG_CURR_SINK, sink_test);
+		if (rc < 0) {
+			dev_err(wled->dev, "Failed to configure SINK %d rc=%d\n",
+				i + 1, rc);
+			goto failed_detect;
+		}
+
+		/* Enable the module */
+		rc = regmap_update_bits(wled->regmap, wled->ctrl_addr +
+					WLED_CTRL_REG_MOD_EN,
+					WLED_CTRL_REG_MOD_EN_MASK,
+					WLED_CTRL_REG_MOD_EN_MASK);
+		if (rc < 0) {
+			dev_err(wled->dev, "Failed to enable WLED module rc=%d\n",
+				rc);
+			goto failed_detect;
+		}
+
+		usleep_range(WLED_SOFT_START_DLY_US,
+			     WLED_SOFT_START_DLY_US + 1000);
+
+		rc = regmap_read(wled->regmap, wled->ctrl_addr +
+				 WLED_CTRL_REG_INT_RT_STS, &int_sts);
+		if (rc < 0) {
+			dev_err(wled->dev, "Error in reading WLED3_CTRL_INT_RT_STS rc=%d\n",
+				rc);
+			goto failed_detect;
+		}
+
+		if (int_sts & WLED_CTRL_REG_OVP_FAULT_STATUS)
+			dev_dbg(wled->dev, "WLED OVP fault detected with SINK %d\n",
+				i + 1);
+		else
+			sink_valid |= sink_test;
+
+		/* Disable the module */
+		rc = regmap_update_bits(wled->regmap,
+					wled->ctrl_addr + WLED_CTRL_REG_MOD_EN,
+					WLED_CTRL_REG_MOD_EN_MASK, 0);
+		if (rc < 0) {
+			dev_err(wled->dev, "Failed to disable WLED module rc=%d\n",
+				rc);
+			goto failed_detect;
+		}
+	}
+
+	if (!sink_valid) {
+		dev_err(wled->dev, "No valid WLED sinks found\n");
+		wled->disabled_by_short = true;
+		goto failed_detect;
+	}
+
+	if (sink_valid == sink_config) {
+		dev_dbg(wled->dev, "WLED auto-detection complete, sink-config=%x OK!\n",
+			sink_config);
+	} else {
+		dev_warn(wled->dev, "New WLED string configuration found %x\n",
+			 sink_valid);
+		sink_config = sink_valid;
+	}
+
+	/* write the new sink configuration */
+	rc = regmap_write(wled->regmap,
+			  wled->sink_addr + WLED4_SINK_REG_CURR_SINK,
+			  sink_config);
+	if (rc < 0) {
+		dev_err(wled->dev, "Failed to reconfigure the default sink rc=%d\n",
+			rc);
+		goto failed_detect;
+	}
+
+	/* Enable valid sinks */
+	for (i = 0; i < wled->cfg.num_strings; i++) {
+		if (wled->cfg.cabc) {
+			rc = regmap_update_bits(wled->regmap, wled->sink_addr +
+						WLED4_SINK_REG_STR_CABC(i),
+						WLED4_SINK_REG_STR_CABC_MASK,
+						WLED4_SINK_REG_STR_CABC_MASK);
+			if (rc < 0)
+				goto failed_detect;
+		}
+
+		if (sink_config & BIT(WLED4_SINK_REG_CURR_SINK_SHFT + i))
+			val = WLED4_SINK_REG_STR_MOD_MASK;
+		else
+			val = 0x0; /* disable modulator_en for unused sink */
+
+		rc = regmap_write(wled->regmap, wled->sink_addr +
+				  WLED4_SINK_REG_STR_MOD_EN(i), val);
+		if (rc < 0) {
+			dev_err(wled->dev, "Failed to configure MODULATOR_EN rc=%d\n",
+				rc);
+			goto failed_detect;
+		}
+	}
+
+	/* restore the feedback setting */
+	rc = regmap_write(wled->regmap,
+			  wled->ctrl_addr + WLED_CTRL_REG_FEEDBACK_CONTROL, 0);
+	if (rc < 0) {
+		dev_err(wled->dev, "Failed to restore feedback setting rc=%d\n",
+			rc);
+		goto failed_detect;
+	}
+
+	/* restore brightness */
+	rc = wled4_set_brightness(wled, wled->brightness);
+	if (rc < 0) {
+		dev_err(wled->dev, "Failed to set brightness after auto detection rc=%d\n",
+			rc);
+		goto failed_detect;
+	}
+
+	rc = regmap_update_bits(wled->regmap,
+				wled->ctrl_addr + WLED_CTRL_REG_MOD_EN,
+				WLED_CTRL_REG_MOD_EN_MASK,
+				WLED_CTRL_REG_MOD_EN_MASK);
+	if (rc < 0) {
+		dev_err(wled->dev, "Failed to enable WLED module rc=%d\n", rc);
+		goto failed_detect;
+	}
+
+failed_detect:
+	return;
+}
+
+#define WLED_AUTO_DETECT_OVP_COUNT		5
+#define WLED_AUTO_DETECT_CNT_DLY_US		USEC_PER_SEC
+static bool wled_auto_detection_required(struct wled *wled)
+{
+	s64 elapsed_time_us;
+
+	if (!wled->cfg.auto_detection_enabled)
+		return false;
+
+	/*
+	 * Check if the OVP fault was an occasional one
+	 * or if it's firing continuously, the latter qualifies
+	 * for an auto-detection check.
+	 */
+	if (!wled->auto_detection_ovp_count) {
+		wled->start_ovp_fault_time = ktime_get();
+		wled->auto_detection_ovp_count++;
+	} else {
+		elapsed_time_us = ktime_us_delta(ktime_get(),
+						 wled->start_ovp_fault_time);
+		if (elapsed_time_us > WLED_AUTO_DETECT_CNT_DLY_US)
+			wled->auto_detection_ovp_count = 0;
+		else
+			wled->auto_detection_ovp_count++;
+
+		if (wled->auto_detection_ovp_count >=
+				WLED_AUTO_DETECT_OVP_COUNT) {
+			wled->auto_detection_ovp_count = 0;
+			return true;
+		}
+	}
+
+	return false;
+}
+
+static int wled_auto_detection_at_init(struct wled *wled)
+{
+	int rc;
+	u32 fault_status, rt_status;
+
+	if (!wled->cfg.auto_detection_enabled)
+		return 0;
+
+	rc = regmap_read(wled->regmap,
+			 wled->ctrl_addr + WLED_CTRL_REG_INT_RT_STS,
+			 &rt_status);
+	if (rc < 0) {
+		dev_err(wled->dev, "Failed to read RT status rc=%d\n", rc);
+		return rc;
+	}
+
+	rc = regmap_read(wled->regmap,
+			 wled->ctrl_addr + WLED_CTRL_REG_FAULT_STATUS,
+			 &fault_status);
+	if (rc < 0) {
+		dev_err(wled->dev, "Failed to read fault status rc=%d\n", rc);
+		return rc;
+	}
+
+	if ((rt_status & WLED_CTRL_REG_OVP_FAULT_STATUS) ||
+	    (fault_status & WLED_CTRL_REG_OVP_FAULT_BIT)) {
+		mutex_lock(&wled->lock);
+		wled_auto_string_detection(wled);
+		mutex_unlock(&wled->lock);
+	}
+
+	return rc;
+}
+
+static irqreturn_t wled_ovp_irq_handler(int irq, void *_wled)
+{
+	struct wled *wled = _wled;
+	int rc;
+	u32 int_sts, fault_sts;
+
+	rc = regmap_read(wled->regmap,
+			 wled->ctrl_addr + WLED_CTRL_REG_INT_RT_STS, &int_sts);
+	if (rc < 0) {
+		dev_err(wled->dev, "Error in reading WLED3_INT_RT_STS rc=%d\n",
+			rc);
+		return IRQ_HANDLED;
+	}
+
+	rc = regmap_read(wled->regmap, wled->ctrl_addr +
+			 WLED_CTRL_REG_FAULT_STATUS, &fault_sts);
+	if (rc < 0) {
+		dev_err(wled->dev, "Error in reading WLED_FAULT_STATUS rc=%d\n",
+			rc);
+		return IRQ_HANDLED;
+	}
+
+	if (fault_sts &
+		(WLED_CTRL_REG_OVP_FAULT_BIT | WLED_CTRL_REG_ILIM_FAULT_BIT))
+		dev_dbg(wled->dev, "WLED OVP fault detected, int_sts=%x fault_sts= %x\n",
+			int_sts, fault_sts);
+
+	if (fault_sts & WLED_CTRL_REG_OVP_FAULT_BIT) {
+		mutex_lock(&wled->lock);
+		disable_irq_nosync(wled->ovp_irq);
+
+		if (wled_auto_detection_required(wled))
+			wled_auto_string_detection(wled);
+
+		enable_irq(wled->ovp_irq);
+		wled->ovp_irq_disabled = false;
+
+		mutex_unlock(&wled->lock);
+	}
+
+	return IRQ_HANDLED;
+}
+
 static int wled3_setup(struct wled *wled)
 {
 	u16 addr;
@@ -442,8 +785,10 @@ static int wled4_setup(struct wled *wled)
 		sink_en |= 1 << temp;
 	}
 
-	if (sink_cfg == sink_en)
-		return 0;
+	if (sink_cfg == sink_en) {
+		rc = wled_auto_detection_at_init(wled);
+		return rc;
+	}
 
 	rc = regmap_update_bits(wled->regmap,
 				wled->sink_addr + WLED4_SINK_REG_CURR_SINK,
@@ -506,7 +851,9 @@ static int wled4_setup(struct wled *wled)
 		return rc;
 	}
 
-	return 0;
+	rc = wled_auto_detection_at_init(wled);
+
+	return rc;
 }
 
 static const struct wled_config wled4_config_defaults = {
@@ -517,6 +864,7 @@ static int wled4_setup(struct wled *wled)
 	.switch_freq = 11,
 	.cabc = false,
 	.external_pfet = false,
+	.auto_detection_enabled = false,
 };
 
 static const u32 wled3_boost_i_limit_values[] = {
@@ -686,6 +1034,7 @@ static int wled_configure(struct wled *wled, int version)
 		{ "qcom,ext-gen", &cfg->ext_gen, },
 		{ "qcom,cabc", &cfg->cabc, },
 		{ "qcom,external-pfet", &cfg->external_pfet, },
+		{ "qcom,auto-string-detection", &cfg->auto_detection_enabled, },
 	};
 
 	prop_addr = of_get_address(dev->of_node, 0, NULL, NULL);
@@ -806,6 +1155,42 @@ static int wled_configure_short_irq(struct wled *wled,
 	return rc;
 }
 
+static int wled_configure_ovp_irq(struct wled *wled,
+				  struct platform_device *pdev)
+{
+	int rc;
+	u32 val;
+
+	wled->ovp_irq = platform_get_irq_byname(pdev, "ovp");
+	if (wled->ovp_irq < 0) {
+		dev_dbg(&pdev->dev, "ovp irq is not used\n");
+		return 0;
+	}
+
+	rc = devm_request_threaded_irq(wled->dev, wled->ovp_irq, NULL,
+				       wled_ovp_irq_handler, IRQF_ONESHOT,
+				       "wled_ovp_irq", wled);
+	if (rc < 0) {
+		dev_err(wled->dev, "Unable to request ovp_irq (err:%d)\n",
+			rc);
+		wled->ovp_irq = 0;
+		return 0;
+	}
+
+	rc = regmap_read(wled->regmap, wled->ctrl_addr +
+			 WLED_CTRL_REG_MOD_EN, &val);
+	if (rc < 0)
+		return rc;
+
+	/* Keep OVP irq disabled until module is enabled */
+	if (!(val & WLED_CTRL_REG_MOD_EN_MASK)) {
+		disable_irq(wled->ovp_irq);
+		wled->ovp_irq_disabled = true;
+	}
+
+	return 0;
+}
+
 static const struct backlight_ops wled_ops = {
 	.update_status = wled_update_status,
 };
@@ -846,6 +1231,7 @@ static int wled_probe(struct platform_device *pdev)
 
 	switch (version) {
 	case WLED3:
+		wled->cfg.auto_detection_enabled = false;
 		rc = wled3_setup(wled);
 		if (rc) {
 			dev_err(&pdev->dev, "wled3_setup failed\n");
@@ -867,10 +1253,16 @@ static int wled_probe(struct platform_device *pdev)
 		break;
 	}
 
+	INIT_DELAYED_WORK(&wled->ovp_work, wled_ovp_work);
+
 	rc = wled_configure_short_irq(wled, pdev);
 	if (rc < 0)
 		return rc;
 
+	rc = wled_configure_ovp_irq(wled, pdev);
+	if (rc < 0)
+		return rc;
+
 	val = WLED_DEFAULT_BRIGHTNESS;
 	of_property_read_u32(pdev->dev.of_node, "default-brightness", &val);
 
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
 a Linux Foundation Collaborative Project


^ permalink raw reply related	[flat|nested] 33+ messages in thread

* Re: [PATCH V4 8/8] backlight: qcom-wled: Add auto string detection logic
  2018-07-09 10:22 ` [PATCH V4 8/8] backlight: qcom-wled: Add auto string detection logic Kiran Gunda
@ 2018-08-07  6:32   ` Bjorn Andersson
  2018-08-16  5:33     ` kgunda
  0 siblings, 1 reply; 33+ messages in thread
From: Bjorn Andersson @ 2018-08-07  6:32 UTC (permalink / raw)
  To: Kiran Gunda
  Cc: jingoohan1, lee.jones, b.zolnierkie, dri-devel, daniel.thompson,
	jacek.anaszewski, pavel, robh+dt, mark.rutland, linux-leds,
	devicetree, linux-kernel, linux-fbdev, linux-arm-msm

On Mon 09 Jul 03:22 PDT 2018, Kiran Gunda wrote:
> diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
[..]
> @@ -189,6 +206,15 @@ static int wled4_set_brightness(struct wled *wled, u16 brightness)
>  	return 0;
>  }
>  
> +static void wled_ovp_work(struct work_struct *work)
> +{
> +	struct wled *wled = container_of(work,
> +					 struct wled, ovp_work.work);
> +
> +	if (wled->ovp_irq > 0)
> +		enable_irq(wled->ovp_irq);
> +}
> +
>  static int wled_module_enable(struct wled *wled, int val)
>  {
>  	int rc;
> @@ -200,7 +226,18 @@ static int wled_module_enable(struct wled *wled, int val)
>  				WLED_CTRL_REG_MOD_EN,
>  				WLED_CTRL_REG_MOD_EN_MASK,
>  				val << WLED_CTRL_REG_MOD_EN_SHIFT);
> -	return rc;
> +	if (rc < 0)
> +		return rc;
> +
> +	if (val) {
> +		schedule_delayed_work(&wled->ovp_work, WLED_SOFT_START_DLY_US);

schedule_delayed_work() takes a delay in jiffies, not micro seconds.

> +	} else {
> +		cancel_delayed_work_sync(&wled->ovp_work);

If we get here within WLED_SOFT_START_DLY_US of a module enable we have
yet to execute the enable_irq() in the delayed worker, which should mean
that the irq is unbalanced from then on.

I believe you can check the return value of cancel_delayed_work_sync()
being true to know if wled_ovp_work() was yet to execute.

> +		if (wled->ovp_irq > 0)
> +			disable_irq(wled->ovp_irq);
> +	}
> +
> +	return 0;
>  }
>  

Regards,
Bjorn

^ permalink raw reply	[flat|nested] 33+ messages in thread

* Re: [PATCH V4 8/8] backlight: qcom-wled: Add auto string detection logic
  2018-08-07  6:32   ` Bjorn Andersson
@ 2018-08-16  5:33     ` kgunda
  0 siblings, 0 replies; 33+ messages in thread
From: kgunda @ 2018-08-16  5:33 UTC (permalink / raw)
  To: Bjorn Andersson
  Cc: jingoohan1, lee.jones, b.zolnierkie, dri-devel, daniel.thompson,
	jacek.anaszewski, pavel, robh+dt, mark.rutland, linux-leds,
	devicetree, linux-kernel, linux-fbdev, linux-arm-msm,
	linux-arm-msm-owner

On 2018-08-07 12:02, Bjorn Andersson wrote:
> On Mon 09 Jul 03:22 PDT 2018, Kiran Gunda wrote:
>> diff --git a/drivers/video/backlight/qcom-wled.c 
>> b/drivers/video/backlight/qcom-wled.c
> [..]
>> @@ -189,6 +206,15 @@ static int wled4_set_brightness(struct wled 
>> *wled, u16 brightness)
>>  	return 0;
>>  }
>> 
>> +static void wled_ovp_work(struct work_struct *work)
>> +{
>> +	struct wled *wled = container_of(work,
>> +					 struct wled, ovp_work.work);
>> +
>> +	if (wled->ovp_irq > 0)
>> +		enable_irq(wled->ovp_irq);
>> +}
>> +
>>  static int wled_module_enable(struct wled *wled, int val)
>>  {
>>  	int rc;
>> @@ -200,7 +226,18 @@ static int wled_module_enable(struct wled *wled, 
>> int val)
>>  				WLED_CTRL_REG_MOD_EN,
>>  				WLED_CTRL_REG_MOD_EN_MASK,
>>  				val << WLED_CTRL_REG_MOD_EN_SHIFT);
>> -	return rc;
>> +	if (rc < 0)
>> +		return rc;
>> +
>> +	if (val) {
>> +		schedule_delayed_work(&wled->ovp_work, WLED_SOFT_START_DLY_US);
> 
> schedule_delayed_work() takes a delay in jiffies, not micro seconds.
> 
I will address it in the next series.
>> +	} else {
>> +		cancel_delayed_work_sync(&wled->ovp_work);
> 
> If we get here within WLED_SOFT_START_DLY_US of a module enable we have
> yet to execute the enable_irq() in the delayed worker, which should 
> mean
> that the irq is unbalanced from then on.
> 
> I believe you can check the return value of cancel_delayed_work_sync()
> being true to know if wled_ovp_work() was yet to execute.
> 
Ok. I will address it in next series.
>> +		if (wled->ovp_irq > 0)
>> +			disable_irq(wled->ovp_irq);
>> +	}
>> +
>> +	return 0;
>>  }
>> 
> 
> Regards,
> Bjorn
> --
> To unsubscribe from this list: send the line "unsubscribe 
> linux-arm-msm" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

^ permalink raw reply	[flat|nested] 33+ messages in thread

* Re: [PATCH V4 0/8] backlight: qcom-wled: Support for QCOM wled driver
  2018-07-09 10:22 [PATCH V4 0/8] backlight: qcom-wled: Support for QCOM wled driver Kiran Gunda
                   ` (7 preceding siblings ...)
  2018-07-09 10:22 ` [PATCH V4 8/8] backlight: qcom-wled: Add auto string detection logic Kiran Gunda
@ 2018-08-03  7:19 ` kgunda
  2018-08-03  7:45   ` Daniel Thompson
  8 siblings, 1 reply; 33+ messages in thread
From: kgunda @ 2018-08-03  7:19 UTC (permalink / raw)
  To: bjorn.andersson, jingoohan1, lee.jones, b.zolnierkie, dri-devel,
	daniel.thompson, jacek.anaszewski, pavel, robh+dt, mark.rutland,
	linux-leds, devicetree, linux-kernel
  Cc: linux-arm-msm, linux-arm-msm-owner

Hi Bjorn,
Can you please help review this patch series ?

Pavel, Rob, Daniel reviewed the series except the "auto string 
detection" patch.

Thanks,
Kiran

On 2018-07-09 15:52, Kiran Gunda wrote:
> This patch series renames the pm8941-wled.c driver to qcom-wled.c to 
> add
> the support for multiple PMICs supported by qualcomm. This patch series
> supports both PM8941 and PMI8998 WLED. The PMI8998 WLED has the support
> to handle the OVP (over voltage protection) and the SC (short circuit
> protection)
> interrupts. It also has the auto string detection algorithm support to
> configure the right strings if the user specified string configuration
> is in-correct. These three features are added in this series for 
> PMI8998.
> 
> changes from v1:
>    - Fixed the commit message for
>    - backlight: qcom-wled: Rename pm8941-wled.c to qcom-wled.c
> 
> Changes from v2:
>    - Fixed bjorn and other reviewer's comments
>    - Seperated the device tree bindings
>    - Splitted out the WLED4 changes in seperate patch
>    - Merged OVP and auto string detection patch
> 
> Changes from v3:
>   - Added Reviewed-by/Acked-by tags
>   - Fixed comments from Bjorn/Vinod/Rob
>   - Splitting the "backlight: qcom-wled: Add support for WLED4 
> peripheral" patch
>     to seperate the WLED3 specific restructure.
> 
> Kiran Gunda (8):
>   backlight: qcom-wled: Rename pm8941-wled.c to qcom-wled.c
>   backlight: qcom-wled: restructure the qcom-wled bindings
>   backlight: qcom-wled: Add new properties for PMI8998
>   backlight: qcom-wled: Rename PM8941* to WLED3
>   backlight: qcom-wled: Restructure the driver for WLED3
>   backlight: qcom-wled: Add support for WLED4 peripheral
>   backlight: qcom-wled: add support for short circuit handling
>   backlight: qcom-wled: Add auto string detection logic
> 
>  .../bindings/leds/backlight/pm8941-wled.txt        |   42 -
>  .../bindings/leds/backlight/qcom-wled.txt          |  150 +++
>  drivers/video/backlight/Kconfig                    |    8 +-
>  drivers/video/backlight/Makefile                   |    2 +-
>  drivers/video/backlight/pm8941-wled.c              |  432 -------
>  drivers/video/backlight/qcom-wled.c                | 1298 
> ++++++++++++++++++++
>  6 files changed, 1453 insertions(+), 479 deletions(-)
>  delete mode 100644
> Documentation/devicetree/bindings/leds/backlight/pm8941-wled.txt
>  create mode 100644
> Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt
>  delete mode 100644 drivers/video/backlight/pm8941-wled.c
>  create mode 100644 drivers/video/backlight/qcom-wled.c

^ permalink raw reply	[flat|nested] 33+ messages in thread

* Re: [PATCH V4 0/8] backlight: qcom-wled: Support for QCOM wled driver
  2018-08-03  7:19 ` [PATCH V4 0/8] backlight: qcom-wled: Support for QCOM wled driver kgunda
@ 2018-08-03  7:45   ` Daniel Thompson
  2018-08-06 10:58     ` kgunda
  0 siblings, 1 reply; 33+ messages in thread
From: Daniel Thompson @ 2018-08-03  7:45 UTC (permalink / raw)
  To: kgunda
  Cc: bjorn.andersson, jingoohan1, lee.jones, b.zolnierkie, dri-devel,
	jacek.anaszewski, pavel, robh+dt, mark.rutland, linux-leds,
	devicetree, linux-kernel, linux-arm-msm, linux-arm-msm-owner

On Fri, Aug 03, 2018 at 12:49:34PM +0530, kgunda@codeaurora.org wrote:
> Hi Bjorn,
> Can you please help review this patch series ?
> 
> Pavel, Rob, Daniel reviewed the series except the "auto string detection"
> patch.

I did take a glance at the last patch... but in the end decided to wait
for v5 to look in depth.


Daniel.


> 
> Thanks,
> Kiran
> 
> On 2018-07-09 15:52, Kiran Gunda wrote:
> > This patch series renames the pm8941-wled.c driver to qcom-wled.c to add
> > the support for multiple PMICs supported by qualcomm. This patch series
> > supports both PM8941 and PMI8998 WLED. The PMI8998 WLED has the support
> > to handle the OVP (over voltage protection) and the SC (short circuit
> > protection)
> > interrupts. It also has the auto string detection algorithm support to
> > configure the right strings if the user specified string configuration
> > is in-correct. These three features are added in this series for
> > PMI8998.
> > 
> > changes from v1:
> >    - Fixed the commit message for
> >    - backlight: qcom-wled: Rename pm8941-wled.c to qcom-wled.c
> > 
> > Changes from v2:
> >    - Fixed bjorn and other reviewer's comments
> >    - Seperated the device tree bindings
> >    - Splitted out the WLED4 changes in seperate patch
> >    - Merged OVP and auto string detection patch
> > 
> > Changes from v3:
> >   - Added Reviewed-by/Acked-by tags
> >   - Fixed comments from Bjorn/Vinod/Rob
> >   - Splitting the "backlight: qcom-wled: Add support for WLED4
> > peripheral" patch
> >     to seperate the WLED3 specific restructure.
> > 
> > Kiran Gunda (8):
> >   backlight: qcom-wled: Rename pm8941-wled.c to qcom-wled.c
> >   backlight: qcom-wled: restructure the qcom-wled bindings
> >   backlight: qcom-wled: Add new properties for PMI8998
> >   backlight: qcom-wled: Rename PM8941* to WLED3
> >   backlight: qcom-wled: Restructure the driver for WLED3
> >   backlight: qcom-wled: Add support for WLED4 peripheral
> >   backlight: qcom-wled: add support for short circuit handling
> >   backlight: qcom-wled: Add auto string detection logic
> > 
> >  .../bindings/leds/backlight/pm8941-wled.txt        |   42 -
> >  .../bindings/leds/backlight/qcom-wled.txt          |  150 +++
> >  drivers/video/backlight/Kconfig                    |    8 +-
> >  drivers/video/backlight/Makefile                   |    2 +-
> >  drivers/video/backlight/pm8941-wled.c              |  432 -------
> >  drivers/video/backlight/qcom-wled.c                | 1298
> > ++++++++++++++++++++
> >  6 files changed, 1453 insertions(+), 479 deletions(-)
> >  delete mode 100644
> > Documentation/devicetree/bindings/leds/backlight/pm8941-wled.txt
> >  create mode 100644
> > Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt
> >  delete mode 100644 drivers/video/backlight/pm8941-wled.c
> >  create mode 100644 drivers/video/backlight/qcom-wled.c

^ permalink raw reply	[flat|nested] 33+ messages in thread

* Re: [PATCH V4 0/8] backlight: qcom-wled: Support for QCOM wled driver
  2018-08-03  7:45   ` Daniel Thompson
@ 2018-08-06 10:58     ` kgunda
  0 siblings, 0 replies; 33+ messages in thread
From: kgunda @ 2018-08-06 10:58 UTC (permalink / raw)
  To: Daniel Thompson
  Cc: bjorn.andersson, jingoohan1, lee.jones, b.zolnierkie, dri-devel,
	jacek.anaszewski, pavel, robh+dt, mark.rutland, linux-leds,
	devicetree, linux-kernel, linux-arm-msm, linux-arm-msm-owner

On 2018-08-03 13:15, Daniel Thompson wrote:
> On Fri, Aug 03, 2018 at 12:49:34PM +0530, kgunda@codeaurora.org wrote:
>> Hi Bjorn,
>> Can you please help review this patch series ?
>> 
>> Pavel, Rob, Daniel reviewed the series except the "auto string 
>> detection"
>> patch.
> 
> I did take a glance at the last patch... but in the end decided to wait
> for v5 to look in depth.
> 
> 
> Daniel.
> 
> 
>> 
Thanks Daniel! I will push the V5 series then.

>> Thanks,
>> Kiran
>> 
>> On 2018-07-09 15:52, Kiran Gunda wrote:
>> > This patch series renames the pm8941-wled.c driver to qcom-wled.c to add
>> > the support for multiple PMICs supported by qualcomm. This patch series
>> > supports both PM8941 and PMI8998 WLED. The PMI8998 WLED has the support
>> > to handle the OVP (over voltage protection) and the SC (short circuit
>> > protection)
>> > interrupts. It also has the auto string detection algorithm support to
>> > configure the right strings if the user specified string configuration
>> > is in-correct. These three features are added in this series for
>> > PMI8998.
>> >
>> > changes from v1:
>> >    - Fixed the commit message for
>> >    - backlight: qcom-wled: Rename pm8941-wled.c to qcom-wled.c
>> >
>> > Changes from v2:
>> >    - Fixed bjorn and other reviewer's comments
>> >    - Seperated the device tree bindings
>> >    - Splitted out the WLED4 changes in seperate patch
>> >    - Merged OVP and auto string detection patch
>> >
>> > Changes from v3:
>> >   - Added Reviewed-by/Acked-by tags
>> >   - Fixed comments from Bjorn/Vinod/Rob
>> >   - Splitting the "backlight: qcom-wled: Add support for WLED4
>> > peripheral" patch
>> >     to seperate the WLED3 specific restructure.
>> >
>> > Kiran Gunda (8):
>> >   backlight: qcom-wled: Rename pm8941-wled.c to qcom-wled.c
>> >   backlight: qcom-wled: restructure the qcom-wled bindings
>> >   backlight: qcom-wled: Add new properties for PMI8998
>> >   backlight: qcom-wled: Rename PM8941* to WLED3
>> >   backlight: qcom-wled: Restructure the driver for WLED3
>> >   backlight: qcom-wled: Add support for WLED4 peripheral
>> >   backlight: qcom-wled: add support for short circuit handling
>> >   backlight: qcom-wled: Add auto string detection logic
>> >
>> >  .../bindings/leds/backlight/pm8941-wled.txt        |   42 -
>> >  .../bindings/leds/backlight/qcom-wled.txt          |  150 +++
>> >  drivers/video/backlight/Kconfig                    |    8 +-
>> >  drivers/video/backlight/Makefile                   |    2 +-
>> >  drivers/video/backlight/pm8941-wled.c              |  432 -------
>> >  drivers/video/backlight/qcom-wled.c                | 1298
>> > ++++++++++++++++++++
>> >  6 files changed, 1453 insertions(+), 479 deletions(-)
>> >  delete mode 100644
>> > Documentation/devicetree/bindings/leds/backlight/pm8941-wled.txt
>> >  create mode 100644
>> > Documentation/devicetree/bindings/leds/backlight/qcom-wled.txt
>> >  delete mode 100644 drivers/video/backlight/pm8941-wled.c
>> >  create mode 100644 drivers/video/backlight/qcom-wled.c
> --
> To unsubscribe from this list: send the line "unsubscribe 
> linux-arm-msm" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

^ permalink raw reply	[flat|nested] 33+ messages in thread

end of thread, other threads:[~2018-09-26  5:31 UTC | newest]

Thread overview: 33+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-07-09 10:22 [PATCH V4 0/8] backlight: qcom-wled: Support for QCOM wled driver Kiran Gunda
2018-07-09 10:22 ` [PATCH V4 1/8] backlight: qcom-wled: Rename pm8941-wled.c to qcom-wled.c Kiran Gunda
2018-07-09 10:22 ` [PATCH V4 2/8] backlight: qcom-wled: restructure the qcom-wled bindings Kiran Gunda
2018-07-09 10:22 ` [PATCH V4 3/8] backlight: qcom-wled: Add new properties for PMI8998 Kiran Gunda
2018-07-11 15:12   ` Rob Herring
2018-07-20 13:15   ` Daniel Thompson
2018-08-07  5:23   ` Bjorn Andersson
2018-08-16  5:23     ` kgunda
2018-09-03 18:55       ` Bjorn Andersson
2018-09-26  5:31         ` kgunda
2018-07-09 10:22 ` [PATCH V4 4/8] backlight: qcom-wled: Rename PM8941* to WLED3 Kiran Gunda
2018-07-20 13:23   ` Daniel Thompson
2018-07-23  5:55     ` kgunda
2018-08-07  5:41   ` Bjorn Andersson
2018-08-16  5:30     ` kgunda
2018-07-09 10:22 ` [PATCH V4 5/8] backlight: qcom-wled: Restructure the driver for WLED3 Kiran Gunda
2018-07-20 13:40   ` Daniel Thompson
2018-08-07  5:37   ` Bjorn Andersson
2018-08-16  5:28     ` kgunda
2018-07-09 10:22 ` [PATCH V4 6/8] backlight: qcom-wled: Add support for WLED4 peripheral Kiran Gunda
2018-07-20 13:47   ` Daniel Thompson
2018-07-20 21:21     ` Pavel Machek
2018-07-23  6:16       ` kgunda
2018-08-07  5:45   ` Bjorn Andersson
2018-07-09 10:22 ` [PATCH V4 7/8] backlight: qcom-wled: add support for short circuit handling Kiran Gunda
2018-07-20 14:07   ` Daniel Thompson
2018-07-23  6:05     ` kgunda
2018-07-09 10:22 ` [PATCH V4 8/8] backlight: qcom-wled: Add auto string detection logic Kiran Gunda
2018-08-07  6:32   ` Bjorn Andersson
2018-08-16  5:33     ` kgunda
2018-08-03  7:19 ` [PATCH V4 0/8] backlight: qcom-wled: Support for QCOM wled driver kgunda
2018-08-03  7:45   ` Daniel Thompson
2018-08-06 10:58     ` kgunda

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