[PATCH v7 0/6] Qualcomm Light Pulse Generator

[PATCH v7 0/6] Qualcomm Light Pulse Generator

[Bjorn Andersson]

This introduces support for the Qualcomm Light Pulse Generator block found in a
wide range of Qualcomm PMICs.

Bjorn Andersson (6):
  dt-bindings: leds: Add Qualcomm Light Pulse Generator binding
  leds: Add driver for Qualcomm LPG
  arm64: dts: qcom: Add LPG to pm8916, pm8994, pmi8994 and pmi8998
  arm64: dts: qcom: sdm845: Enable user LEDs on DB845c
  arm64: dts: qcom: pmi8994: Define MPP block
  arm64: dts: qcom: db820c: Add user LEDs

 .../bindings/leds/leds-qcom-lpg.yaml          |  158 ++
 arch/arm64/boot/dts/qcom/apq8096-db820c.dtsi  |   49 +
 arch/arm64/boot/dts/qcom/pm8916.dtsi          |    8 +
 arch/arm64/boot/dts/qcom/pm8994.dtsi          |   10 +
 arch/arm64/boot/dts/qcom/pmi8994.dtsi         |   22 +
 arch/arm64/boot/dts/qcom/pmi8998.dtsi         |   10 +
 arch/arm64/boot/dts/qcom/sdm845-db845c.dts    |   24 +
 drivers/leds/Kconfig                          |    3 +
 drivers/leds/Makefile                         |    3 +
 drivers/leds/rgb/leds-qcom-lpg.c              | 1286 +++++++++++++++++
 10 files changed, 1573 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml
 create mode 100644 drivers/leds/rgb/leds-qcom-lpg.c

-- 
2.29.2

[PATCH v7 1/6] dt-bindings: leds: Add Qualcomm Light Pulse Generator binding

[Bjorn Andersson]

This adds the binding document describing the three hardware blocks
related to the Light Pulse Generator found in a wide range of Qualcomm
PMICs.

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

Changes since v6:
- Backed qcom,dtest out of the child nodes again, as it's useful to be able to
  route pwm signals through dtest lines as well (and pwm channels aren't
  described as children).
- Added pm8150[bl] compatibles
- Dropped quotes around qcom,dtest
- Fixed indentation errors in subnode definition

 .../bindings/leds/leds-qcom-lpg.yaml          | 158 ++++++++++++++++++
 1 file changed, 158 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml

diff --git a/Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml b/Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml
new file mode 100644
index 000000000000..2998598e8785
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml
@@ -0,0 +1,158 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/leds-qcom-lpg.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Light Pulse Generator
+
+maintainers:
+  - Bjorn Andersson <bjorn.andersson@linaro.org>
+
+description: >
+  The Qualcomm Light Pulse Generator consists of three different hardware blocks;
+  a ramp generator with lookup table, the light pulse generator and a three
+  channel current sink. These blocks are found in a wide range of Qualcomm PMICs.
+
+properties:
+  compatible:
+    enum:
+      - qcom,pm8150b-lpg
+      - qcom,pm8150l-lpg
+      - qcom,pm8916-pwm
+      - qcom,pm8941-lpg
+      - qcom,pm8994-lpg
+      - qcom,pmi8994-lpg
+      - qcom,pmi8998-lpg
+
+  "#pwm-cells":
+    const: 2
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+  qcom,power-source:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      power-source used to drive the output, as defined in the datasheet.
+      Should be specified if the TRILED block is present
+
+  qcom,dtest:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    description: >
+      A list of integer pairs, where each pair represent the dtest line the
+      particular channel should be connected to and the flags denoting how the
+      value should be outputed, as defined in the datasheet. The number of
+      pairs should be the same as the number of channels.
+
+  multi-led:
+    type: object
+    $ref: leds-class-multicolor.yaml#
+    properties:
+      "#address-cells":
+        const: 1
+
+      "#size-cells":
+        const: 0
+
+      "^led@[0-9a-f]$":
+        type: object
+        $ref: common.yaml#
+
+patternProperties:
+  "^led@[0-9a-f]$":
+    type: object
+    $ref: common.yaml#
+
+    properties:
+      reg: true
+
+    required:
+      - reg
+
+required:
+  - compatible
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/leds/common.h>
+
+    lpg {
+      compatible = "qcom,pmi8994-lpg";
+
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      qcom,power-source = <1>;
+
+      qcom,dtest = <0 0
+                    0 0
+                    0 0
+                    4 1>;
+
+      led@1 {
+        reg = <1>;
+        label = "green:user1";
+      };
+
+      led@2 {
+        reg = <2>;
+        label = "green:user0";
+        default-state = "on";
+      };
+
+      led@3 {
+        reg = <3>;
+        label = "green:user2";
+      };
+
+      led@4 {
+        reg = <4>;
+        label = "green:user3";
+      };
+    };
+  - |
+    #include <dt-bindings/leds/common.h>
+
+    lpg {
+      compatible = "qcom,pmi8994-lpg";
+
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      qcom,power-source = <1>;
+
+      multi-led {
+        color = <LED_COLOR_ID_MULTI>;
+        label = "rgb:notification";
+
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        led@1 {
+          reg = <1>;
+          color = <LED_COLOR_ID_RED>;
+        };
+
+        led@2 {
+          reg = <2>;
+          color = <LED_COLOR_ID_GREEN>;
+        };
+
+        led@3 {
+          reg = <3>;
+          color = <LED_COLOR_ID_BLUE>;
+        };
+      };
+    };
+  - |
+    lpg {
+      compatible = "qcom,pm8916-pwm";
+      #pwm-cells = <2>;
+    };
+...
-- 
2.29.2

Re: [PATCH v7 1/6] dt-bindings: leds: Add Qualcomm Light Pulse Generator binding

[Rob Herring]

On Thu, Apr 29, 2021 at 02:15:12PM -0700, Bjorn Andersson wrote:
> This adds the binding document describing the three hardware blocks
> related to the Light Pulse Generator found in a wide range of Qualcomm
> PMICs.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---
> 
> Changes since v6:
> - Backed qcom,dtest out of the child nodes again, as it's useful to be able to
>   route pwm signals through dtest lines as well (and pwm channels aren't
>   described as children).
> - Added pm8150[bl] compatibles
> - Dropped quotes around qcom,dtest
> - Fixed indentation errors in subnode definition
> 
>  .../bindings/leds/leds-qcom-lpg.yaml          | 158 ++++++++++++++++++
>  1 file changed, 158 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml
> 
> diff --git a/Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml b/Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml
> new file mode 100644
> index 000000000000..2998598e8785
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml
> @@ -0,0 +1,158 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/leds/leds-qcom-lpg.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm Light Pulse Generator
> +
> +maintainers:
> +  - Bjorn Andersson <bjorn.andersson@linaro.org>
> +
> +description: >
> +  The Qualcomm Light Pulse Generator consists of three different hardware blocks;
> +  a ramp generator with lookup table, the light pulse generator and a three
> +  channel current sink. These blocks are found in a wide range of Qualcomm PMICs.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - qcom,pm8150b-lpg
> +      - qcom,pm8150l-lpg
> +      - qcom,pm8916-pwm
> +      - qcom,pm8941-lpg
> +      - qcom,pm8994-lpg
> +      - qcom,pmi8994-lpg
> +      - qcom,pmi8998-lpg
> +
> +  "#pwm-cells":
> +    const: 2
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +  qcom,power-source:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      power-source used to drive the output, as defined in the datasheet.
> +      Should be specified if the TRILED block is present

constraints?

> +
> +  qcom,dtest:
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    description: >
> +      A list of integer pairs, where each pair represent the dtest line the
> +      particular channel should be connected to and the flags denoting how the
> +      value should be outputed, as defined in the datasheet. The number of
> +      pairs should be the same as the number of channels.

Sounds like a matrix rather than array. Constraints on the values?

> +
> +  multi-led:
> +    type: object
> +    $ref: leds-class-multicolor.yaml#
> +    properties:
> +      "#address-cells":
> +        const: 1
> +
> +      "#size-cells":
> +        const: 0
> +
> +      "^led@[0-9a-f]$":
> +        type: object
> +        $ref: common.yaml#
> +
> +patternProperties:
> +  "^led@[0-9a-f]$":
> +    type: object
> +    $ref: common.yaml#
> +
> +    properties:
> +      reg: true
> +
> +    required:
> +      - reg
> +
> +required:
> +  - compatible
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/leds/common.h>
> +
> +    lpg {
> +      compatible = "qcom,pmi8994-lpg";
> +
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      qcom,power-source = <1>;
> +
> +      qcom,dtest = <0 0
> +                    0 0
> +                    0 0
> +                    4 1>;
> +
> +      led@1 {
> +        reg = <1>;
> +        label = "green:user1";
> +      };
> +
> +      led@2 {
> +        reg = <2>;
> +        label = "green:user0";
> +        default-state = "on";
> +      };
> +
> +      led@3 {
> +        reg = <3>;
> +        label = "green:user2";
> +      };
> +
> +      led@4 {
> +        reg = <4>;
> +        label = "green:user3";
> +      };
> +    };
> +  - |
> +    #include <dt-bindings/leds/common.h>
> +
> +    lpg {
> +      compatible = "qcom,pmi8994-lpg";
> +
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      qcom,power-source = <1>;
> +
> +      multi-led {
> +        color = <LED_COLOR_ID_MULTI>;
> +        label = "rgb:notification";
> +
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        led@1 {
> +          reg = <1>;
> +          color = <LED_COLOR_ID_RED>;
> +        };
> +
> +        led@2 {
> +          reg = <2>;
> +          color = <LED_COLOR_ID_GREEN>;
> +        };
> +
> +        led@3 {
> +          reg = <3>;
> +          color = <LED_COLOR_ID_BLUE>;
> +        };
> +      };
> +    };
> +  - |
> +    lpg {
> +      compatible = "qcom,pm8916-pwm";
> +      #pwm-cells = <2>;
> +    };
> +...
> -- 
> 2.29.2
> 

Re: [PATCH v7 1/6] dt-bindings: leds: Add Qualcomm Light Pulse Generator binding

[Bjorn Andersson]

On Fri 30 Apr 15:05 CDT 2021, Rob Herring wrote:
> > diff --git a/Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml b/Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml
[..]
> > +  qcom,power-source:
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +    description:
> > +      power-source used to drive the output, as defined in the datasheet.
> > +      Should be specified if the TRILED block is present
> 
> constraints?
> 

Yes, we should be able to constrain this a little bit.

> > +
> > +  qcom,dtest:
> > +    $ref: /schemas/types.yaml#/definitions/uint32-array
> > +    description: >
> > +      A list of integer pairs, where each pair represent the dtest line the
> > +      particular channel should be connected to and the flags denoting how the
> > +      value should be outputed, as defined in the datasheet. The number of
> > +      pairs should be the same as the number of channels.
> 
> Sounds like a matrix rather than array. Constraints on the values?
> 

I wasn't aware of uint32-matrix and that I can describe the constraints
of the values in the matrix. I'll familiarize myself with it and see if
I can tighten this up a little bit.

Thanks,
Bjorn

Re: [PATCH v7 1/6] dt-bindings: leds: Add Qualcomm Light Pulse Generator binding

[Subbaraman Narayanamurthy]

On 4/29/21 2:15 PM, Bjorn Andersson wrote:
> This adds the binding document describing the three hardware blocks
> related to the Light Pulse Generator found in a wide range of Qualcomm
> PMICs.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---
>
> Changes since v6:
> - Backed qcom,dtest out of the child nodes again, as it's useful to be able to
>   route pwm signals through dtest lines as well (and pwm channels aren't
>   described as children).
> - Added pm8150[bl] compatibles
> - Dropped quotes around qcom,dtest
> - Fixed indentation errors in subnode definition
>
>  .../bindings/leds/leds-qcom-lpg.yaml          | 158 ++++++++++++++++++
>  1 file changed, 158 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml
>
> diff --git a/Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml b/Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml
> new file mode 100644
> index 000000000000..2998598e8785
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml
> @@ -0,0 +1,158 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/leds/leds-qcom-lpg.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm Light Pulse Generator
> +
> +maintainers:
> +  - Bjorn Andersson <bjorn.andersson@linaro.org>
> +
> +description: >
> +  The Qualcomm Light Pulse Generator consists of three different hardware blocks;
> +  a ramp generator with lookup table, the light pulse generator and a three
> +  channel current sink. These blocks are found in a wide range of Qualcomm PMICs.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - qcom,pm8150b-lpg
> +      - qcom,pm8150l-lpg
> +      - qcom,pm8916-pwm
> +      - qcom,pm8941-lpg
> +      - qcom,pm8994-lpg
> +      - qcom,pmi8994-lpg
> +      - qcom,pmi8998-lpg
> +
> +  "#pwm-cells":
> +    const: 2
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +  qcom,power-source:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description:
> +      power-source used to drive the output, as defined in the datasheet.
> +      Should be specified if the TRILED block is present
> +
> +  qcom,dtest:
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    description: >
> +      A list of integer pairs, where each pair represent the dtest line the
> +      particular channel should be connected to and the flags denoting how the
> +      value should be outputed, as defined in the datasheet. The number of
> +      pairs should be the same as the number of channels.
> +
> +  multi-led:
> +    type: object
> +    $ref: leds-class-multicolor.yaml#
> +    properties:
> +      "#address-cells":
> +        const: 1
> +
> +      "#size-cells":
> +        const: 0
> +
> +      "^led@[0-9a-f]$":
> +        type: object
> +        $ref: common.yaml#
> +


Just a question more than a comment. From what I can see, when this device is specified as a multi-color device or an individual device (e.g. "red", "green" and "blue"), the user can only set "pattern" and "repeat" under the corresponding device after setting "pattern" to "trigger". Would you be planning to add a way (e.g. another set of DT properties) for the user to specify such patterns via the devicetree itself?


> +patternProperties:
> +  "^led@[0-9a-f]$":
> +    type: object
> +    $ref: common.yaml#
> +
> +    properties:
> +      reg: true
> +
> +    required:
> +      - reg
> +
> +required:
> +  - compatible
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/leds/common.h>
> +
> +    lpg {
> +      compatible = "qcom,pmi8994-lpg";
> +
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      qcom,power-source = <1>;
> +
> +      qcom,dtest = <0 0
> +                    0 0
> +                    0 0
> +                    4 1>;
> +
> +      led@1 {
> +        reg = <1>;
> +        label = "green:user1";
> +      };
> +
> +      led@2 {
> +        reg = <2>;
> +        label = "green:user0";
> +        default-state = "on";
> +      };
> +
> +      led@3 {
> +        reg = <3>;
> +        label = "green:user2";
> +      };
> +
> +      led@4 {
> +        reg = <4>;
> +        label = "green:user3";
> +      };
> +    };
> +  - |
> +    #include <dt-bindings/leds/common.h>
> +
> +    lpg {
> +      compatible = "qcom,pmi8994-lpg";
> +
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      qcom,power-source = <1>;
> +
> +      multi-led {
> +        color = <LED_COLOR_ID_MULTI>;
> +        label = "rgb:notification";
> +
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        led@1 {
> +          reg = <1>;
> +          color = <LED_COLOR_ID_RED>;
> +        };
> +
> +        led@2 {
> +          reg = <2>;
> +          color = <LED_COLOR_ID_GREEN>;
> +        };
> +
> +        led@3 {
> +          reg = <3>;
> +          color = <LED_COLOR_ID_BLUE>;
> +        };
> +      };
> +    };
> +  - |
> +    lpg {
> +      compatible = "qcom,pm8916-pwm";
> +      #pwm-cells = <2>;
> +    };
> +...


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

Re: [PATCH v7 1/6] dt-bindings: leds: Add Qualcomm Light Pulse Generator binding

[Pavel Machek]

Hi!
On Mon 2021-05-03 18:01:09, Subbaraman Narayanamurthy wrote:
> On 4/29/21 2:15 PM, Bjorn Andersson wrote:
> > This adds the binding document describing the three hardware blocks
> > related to the Light Pulse Generator found in a wide range of Qualcomm
> > PMICs.
> >
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
...
> > +      "^led@[0-9a-f]$":
> > +        type: object
> > +        $ref: common.yaml#
> > +
> 
> 
> Just a question more than a comment. From what I can see, when this device is specified as a multi-color device or an individual device (e.g. "red", "green" and "blue"), the user can only set "pattern" and "repeat" under the corresponding device after setting "pattern" to "trigger". Would you be planning to add a way (e.g. another set of DT properties) for the user to specify such patterns via the devicetree itself?
>

Please trim your replies and format emails to 72 columns or so.

If you need patterns in DTS that can be discussed, but it should be
generic functionality not tied to one driver.

Best regards,

       	    	 	     	    	      	 	 Pavel
-- 

Re: [PATCH v7 1/6] dt-bindings: leds: Add Qualcomm Light Pulse Generator binding

[Subbaraman Narayanamurthy]

On 5/4/21 7:39 AM, Pavel Machek wrote:
> Hi!
> On Mon 2021-05-03 18:01:09, Subbaraman Narayanamurthy wrote:
>> On 4/29/21 2:15 PM, Bjorn Andersson wrote:
>>> This adds the binding document describing the three hardware blocks
>>> related to the Light Pulse Generator found in a wide range of Qualcomm
>>> PMICs.
>>>
>>> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ...
>>> +      "^led@[0-9a-f]$":
>>> +        type: object
>>> +        $ref: common.yaml#
>>> +
>>
>> Just a question more than a comment. From what I can see, when this device is specified as a multi-color device or an individual device (e.g. "red", "green" and "blue"), the user can only set "pattern" and "repeat" under the corresponding device after setting "pattern" to "trigger". Would you be planning to add a way (e.g. another set of DT properties) for the user to specify such patterns via the devicetree itself?
>>
> Please trim your replies and format emails to 72 columns or so.

Sure noted.

> If you need patterns in DTS that can be discussed, but it should be
> generic functionality not tied to one driver.

I agree. It's not tied up just with this driver but wanted to see whether
it's feasible/acceptable.

>
> Best regards,
>
>        	    	 	     	    	      	 	 Pavel

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

[PATCH v7 2/6] leds: Add driver for Qualcomm LPG

[Bjorn Andersson]

The Light Pulse Generator (LPG) is a PWM-block found in a wide range of
PMICs from Qualcomm. It can operate on fixed parameters or based on a
lookup-table, altering the duty cycle over time - which provides the
means for e.g. hardware assisted transitions of LED brightness.

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

Changes since v6:
- Moved code into drivers/leds/rgb/
- Reverted to earlier qcom,dtest handling to support routing pwm signals
  through dtest lines.
- Remember the duration of each step of the pattern, rather than adding up and
  then dividing when the value is used.
- Added missing error prints on DT parse errors.
- Added sm8150[lb] and made led source and atc presence optional
- Added missing parenthesis around (len + 1) / 2 in search for hi_pause in the
  pattern.

 drivers/leds/Kconfig             |    3 +
 drivers/leds/Makefile            |    3 +
 drivers/leds/rgb/leds-qcom-lpg.c | 1286 ++++++++++++++++++++++++++++++
 3 files changed, 1292 insertions(+)
 create mode 100644 drivers/leds/rgb/leds-qcom-lpg.c

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 49d99cb084db..8ab06b3f162d 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -933,6 +933,9 @@ source "drivers/leds/blink/Kconfig"
 comment "Flash and Torch LED drivers"
 source "drivers/leds/flash/Kconfig"
 
+comment "RGB LED drivers"
+source "drivers/leds/rgb/Kconfig"
+
 comment "LED Triggers"
 source "drivers/leds/trigger/Kconfig"
 
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 7e604d3028c8..8cad0465aae0 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -106,6 +106,9 @@ obj-$(CONFIG_LEDS_USER)			+= uleds.o
 # Flash and Torch LED Drivers
 obj-$(CONFIG_LEDS_CLASS_FLASH)		+= flash/
 
+# RGB LED Drivers
+obj-$(CONFIG_LEDS_CLASS_MULTICOLOR)	+= rgb/
+
 # LED Triggers
 obj-$(CONFIG_LEDS_TRIGGERS)		+= trigger/
 
diff --git a/drivers/leds/rgb/leds-qcom-lpg.c b/drivers/leds/rgb/leds-qcom-lpg.c
new file mode 100644
index 000000000000..c68233b43c2c
--- /dev/null
+++ b/drivers/leds/rgb/leds-qcom-lpg.c
@@ -0,0 +1,1286 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2017-2021 Linaro Ltd
+ * Copyright (c) 2010-2012, The Linux Foundation. All rights reserved.
+ */
+#include <linux/bits.h>
+#include <linux/led-class-multicolor.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#define LPG_PATTERN_CONFIG_REG	0x40
+#define LPG_SIZE_CLK_REG	0x41
+#define LPG_PREDIV_CLK_REG	0x42
+#define PWM_TYPE_CONFIG_REG	0x43
+#define PWM_VALUE_REG		0x44
+#define PWM_ENABLE_CONTROL_REG	0x46
+#define PWM_SYNC_REG		0x47
+#define LPG_RAMP_DURATION_REG	0x50
+#define LPG_HI_PAUSE_REG	0x52
+#define LPG_LO_PAUSE_REG	0x54
+#define LPG_HI_IDX_REG		0x56
+#define LPG_LO_IDX_REG		0x57
+#define PWM_SEC_ACCESS_REG	0xd0
+#define PWM_DTEST_REG(x)	(0xe2 + (x) - 1)
+
+#define TRI_LED_SRC_SEL		0x45
+#define TRI_LED_EN_CTL		0x46
+#define TRI_LED_ATC_CTL		0x47
+
+#define LPG_LUT_REG(x)		(0x40 + (x) * 2)
+#define RAMP_CONTROL_REG	0xc8
+
+struct lpg_channel;
+struct lpg_data;
+
+/**
+ * struct lpg - LPG device context
+ * @dev:	struct device for LPG device
+ * @map:	regmap for register access
+ * @pwm:	PWM-chip object, if operating in PWM mode
+ * @lut_base:	base address of the LUT block (optional)
+ * @lut_size:	number of entries in the LUT block
+ * @lut_bitmap:	allocation bitmap for LUT entries
+ * @triled_base: base address of the TRILED block (optional)
+ * @triled_src:	power-source for the TRILED
+ * @triled_has_atc_ctl:	true if there is TRI_LED_ATC_CTL register
+ * @triled_has_src_sel:	true if there is TRI_LED_SRC_SEL register
+ * @channels:	list of PWM channels
+ * @num_channels: number of @channels
+ */
+struct lpg {
+	struct device *dev;
+	struct regmap *map;
+
+	struct pwm_chip pwm;
+
+	const struct lpg_data *data;
+
+	u32 lut_base;
+	u32 lut_size;
+	unsigned long *lut_bitmap;
+
+	u32 triled_base;
+	u32 triled_src;
+	bool triled_has_atc_ctl;
+	bool triled_has_src_sel;
+
+	struct lpg_channel *channels;
+	unsigned int num_channels;
+};
+
+/**
+ * struct lpg_channel - per channel data
+ * @lpg:	reference to parent lpg
+ * @base:	base address of the PWM channel
+ * @triled_mask: mask in TRILED to enable this channel
+ * @lut_mask:	mask in LUT to start pattern generator for this channel
+ * @in_use:	channel is exposed to LED framework
+ * @color:	color of the LED attached to this channel
+ * @dtest_line:	DTEST line for output, or 0 if disabled
+ * @dtest_value: DTEST line configuration
+ * @pwm_value:	duty (in microseconds) of the generated pulses, overridden by LUT
+ * @enabled:	output enabled?
+ * @period_us:	period (in microseconds) of the generated pulses
+ * @pwm_size:	resolution of the @pwm_value, 6 or 9 bits
+ * @clk:	base frequency of the clock generator
+ * @pre_div:	divider of @clk
+ * @pre_div_exp: exponential divider of @clk
+ * @ramp_enabled: duty cycle is driven by iterating over lookup table
+ * @ramp_ping_pong: reverse through pattern, rather than wrapping to start
+ * @ramp_oneshot: perform only a single pass over the pattern
+ * @ramp_reverse: iterate over pattern backwards
+ * @ramp_tick_ms: length (in milliseconds) of one step in the pattern
+ * @ramp_lo_pause_ms: pause (in milliseconds) before iterating over pattern
+ * @ramp_hi_pause_ms: pause (in milliseconds) after iterating over pattern
+ * @pattern_lo_idx: start index of associated pattern
+ * @pattern_hi_idx: last index of associated pattern
+ */
+struct lpg_channel {
+	struct lpg *lpg;
+
+	u32 base;
+	unsigned int triled_mask;
+	unsigned int lut_mask;
+
+	bool in_use;
+
+	int color;
+
+	u32 dtest_line;
+	u32 dtest_value;
+
+	u16 pwm_value;
+	bool enabled;
+
+	unsigned int period_us;
+	unsigned int pwm_size;
+	unsigned int clk;
+	unsigned int pre_div;
+	unsigned int pre_div_exp;
+
+	bool ramp_enabled;
+	bool ramp_ping_pong;
+	bool ramp_oneshot;
+	bool ramp_reverse;
+	unsigned long ramp_tick_ms;
+	unsigned long ramp_lo_pause_ms;
+	unsigned long ramp_hi_pause_ms;
+
+	unsigned int pattern_lo_idx;
+	unsigned int pattern_hi_idx;
+};
+
+/**
+ * struct lpg_led - logical LED object
+ * @lpg:		lpg context reference
+ * @cdev:		LED class device
+ * @mcdev:		Multicolor LED class device
+ * @num_channels:	number of @channels
+ * @channels:		list of channels associated with the LED
+ */
+struct lpg_led {
+	struct lpg *lpg;
+
+	struct led_classdev cdev;
+	struct led_classdev_mc mcdev;
+
+	unsigned int num_channels;
+	struct lpg_channel *channels[];
+};
+
+/**
+ * struct lpg_channel_data - per channel initialization data
+ * @base:		base address for PWM channel registers
+ * @triled_mask:	bitmask for controlling this channel in TRILED
+ */
+struct lpg_channel_data {
+	unsigned int base;
+	u8 triled_mask;
+};
+
+/**
+ * struct lpg_data - initialization data
+ * @lut_base:		base address of LUT block
+ * @lut_size:		number of entries in LUT
+ * @triled_base:	base address of TRILED
+ * @triled_has_atc_ctl:	true if there is TRI_LED_ATC_CTL register
+ * @triled_has_src_sel:	true if there is TRI_LED_SRC_SEL register
+ * @pwm_9bit_mask:	bitmask for switching from 6bit to 9bit pwm
+ * @num_channels:	number of channels in LPG
+ * @channels:		list of channel initialization data
+ */
+struct lpg_data {
+	unsigned int lut_base;
+	unsigned int lut_size;
+	unsigned int triled_base;
+	bool triled_has_atc_ctl;
+	bool triled_has_src_sel;
+	unsigned int pwm_9bit_mask;
+	int num_channels;
+	struct lpg_channel_data *channels;
+};
+
+static int triled_set(struct lpg *lpg, unsigned int mask, unsigned int enable)
+{
+	/* Skip if we don't have a triled block */
+	if (!lpg->triled_base)
+		return 0;
+
+	return regmap_update_bits(lpg->map, lpg->triled_base + TRI_LED_EN_CTL,
+				  mask, enable);
+}
+
+static int lpg_lut_store(struct lpg *lpg, struct led_pattern *pattern,
+			 size_t len, unsigned int *lo_idx, unsigned int *hi_idx)
+{
+	unsigned int idx;
+	u16 val;
+	int i;
+
+	/* Hardware does not behave when LO_IDX == HI_IDX */
+	if (len == 1)
+		return -EINVAL;
+
+	idx = bitmap_find_next_zero_area(lpg->lut_bitmap, lpg->lut_size,
+					 0, len, 0);
+	if (idx >= lpg->lut_size)
+		return -ENOMEM;
+
+	for (i = 0; i < len; i++) {
+		val = pattern[i].brightness;
+
+		regmap_bulk_write(lpg->map, lpg->lut_base + LPG_LUT_REG(idx + i), &val, 1);
+	}
+
+	bitmap_set(lpg->lut_bitmap, idx, len);
+
+	*lo_idx = idx;
+	*hi_idx = idx + len - 1;
+
+	return 0;
+}
+
+static void lpg_lut_free(struct lpg *lpg, unsigned int lo_idx, unsigned int hi_idx)
+{
+	int len;
+
+	if (lo_idx == hi_idx)
+		return;
+
+	len = hi_idx - lo_idx + 1;
+	bitmap_clear(lpg->lut_bitmap, lo_idx, len);
+}
+
+static int lpg_lut_sync(struct lpg *lpg, unsigned int mask)
+{
+	return regmap_write(lpg->map, lpg->lut_base + RAMP_CONTROL_REG, mask);
+}
+
+#define NUM_PWM_PREDIV	4
+#define NUM_PWM_CLK	3
+#define NUM_EXP		7
+
+static const unsigned int lpg_clk_table[NUM_PWM_PREDIV][NUM_PWM_CLK] = {
+	{
+		1 * (NSEC_PER_SEC / 1024),
+		1 * (NSEC_PER_SEC / 32768),
+		1 * (NSEC_PER_SEC / 19200000),
+	},
+	{
+		3 * (NSEC_PER_SEC / 1024),
+		3 * (NSEC_PER_SEC / 32768),
+		3 * (NSEC_PER_SEC / 19200000),
+	},
+	{
+		5 * (NSEC_PER_SEC / 1024),
+		5 * (NSEC_PER_SEC / 32768),
+		5 * (NSEC_PER_SEC / 19200000),
+	},
+	{
+		6 * (NSEC_PER_SEC / 1024),
+		6 * (NSEC_PER_SEC / 32768),
+		6 * (NSEC_PER_SEC / 19200000),
+	},
+};
+
+/*
+ * PWM Frequency = Clock Frequency / (N * T)
+ *      or
+ * PWM Period = Clock Period * (N * T)
+ *      where
+ * N = 2^9 or 2^6 for 9-bit or 6-bit PWM size
+ * T = Pre-divide * 2^m, where m = 0..7 (exponent)
+ *
+ * This is the formula to figure out m for the best pre-divide and clock:
+ * (PWM Period / N) = (Pre-divide * Clock Period) * 2^m
+ */
+static void lpg_calc_freq(struct lpg_channel *chan, unsigned int period_us)
+{
+	int             n, m, clk, div;
+	int             best_m, best_div, best_clk;
+	unsigned int    last_err, cur_err, min_err;
+	unsigned int    tmp_p, period_n;
+
+	if (period_us == chan->period_us)
+		return;
+
+	/* PWM Period / N */
+	if (period_us < UINT_MAX / NSEC_PER_USEC)
+		n = 6;
+	else
+		n = 9;
+
+	period_n = ((u64)period_us * NSEC_PER_USEC) >> n;
+
+	min_err = UINT_MAX;
+	last_err = UINT_MAX;
+	best_m = 0;
+	best_clk = 0;
+	best_div = 0;
+	for (clk = 0; clk < NUM_PWM_CLK; clk++) {
+		for (div = 0; div < NUM_PWM_PREDIV; div++) {
+			/* period_n = (PWM Period / N) */
+			/* tmp_p = (Pre-divide * Clock Period) * 2^m */
+			tmp_p = lpg_clk_table[div][clk];
+			for (m = 0; m <= NUM_EXP; m++) {
+				cur_err = abs(period_n - tmp_p);
+				if (cur_err < min_err) {
+					min_err = cur_err;
+					best_m = m;
+					best_clk = clk;
+					best_div = div;
+				}
+
+				if (m && cur_err > last_err)
+					/* Break for bigger cur_err */
+					break;
+
+				last_err = cur_err;
+				tmp_p <<= 1;
+			}
+		}
+	}
+
+	/* Use higher resolution */
+	if (best_m >= 3 && n == 6) {
+		n += 3;
+		best_m -= 3;
+	}
+
+	chan->clk = best_clk;
+	chan->pre_div = best_div;
+	chan->pre_div_exp = best_m;
+	chan->pwm_size = n;
+
+	chan->period_us = period_us;
+}
+
+static void lpg_calc_duty(struct lpg_channel *chan, unsigned int duty_us)
+{
+	unsigned int max = (1 << chan->pwm_size) - 1;
+	unsigned int val = div_u64((u64)duty_us << chan->pwm_size, chan->period_us);
+
+	chan->pwm_value = min(val, max);
+}
+
+static void lpg_apply_freq(struct lpg_channel *chan)
+{
+	unsigned long val;
+	struct lpg *lpg = chan->lpg;
+
+	if (!chan->enabled)
+		return;
+
+	/* Clock register values are off-by-one from lpg_clk_table */
+	val = chan->clk + 1;
+
+	if (chan->pwm_size == 9)
+		val |= lpg->data->pwm_9bit_mask;
+
+	regmap_write(lpg->map, chan->base + LPG_SIZE_CLK_REG, val);
+
+	val = chan->pre_div << 5 | chan->pre_div_exp;
+	regmap_write(lpg->map, chan->base + LPG_PREDIV_CLK_REG, val);
+}
+
+#define LPG_ENABLE_GLITCH_REMOVAL	BIT(5)
+
+static void lpg_enable_glitch(struct lpg_channel *chan)
+{
+	struct lpg *lpg = chan->lpg;
+
+	regmap_update_bits(lpg->map, chan->base + PWM_TYPE_CONFIG_REG,
+			   LPG_ENABLE_GLITCH_REMOVAL, 0);
+}
+
+static void lpg_disable_glitch(struct lpg_channel *chan)
+{
+	struct lpg *lpg = chan->lpg;
+
+	regmap_update_bits(lpg->map, chan->base + PWM_TYPE_CONFIG_REG,
+			   LPG_ENABLE_GLITCH_REMOVAL,
+			   LPG_ENABLE_GLITCH_REMOVAL);
+}
+
+static void lpg_apply_pwm_value(struct lpg_channel *chan)
+{
+	struct lpg *lpg = chan->lpg;
+	u16 val = chan->pwm_value;
+
+	if (!chan->enabled)
+		return;
+
+	regmap_bulk_write(lpg->map, chan->base + PWM_VALUE_REG, &val, 1);
+}
+
+#define LPG_PATTERN_CONFIG_LO_TO_HI	BIT(4)
+#define LPG_PATTERN_CONFIG_REPEAT	BIT(3)
+#define LPG_PATTERN_CONFIG_TOGGLE	BIT(2)
+#define LPG_PATTERN_CONFIG_PAUSE_HI	BIT(1)
+#define LPG_PATTERN_CONFIG_PAUSE_LO	BIT(0)
+
+static void lpg_apply_lut_control(struct lpg_channel *chan)
+{
+	struct lpg *lpg = chan->lpg;
+	unsigned int hi_pause;
+	unsigned int lo_pause;
+	unsigned int step;
+	unsigned int conf = 0;
+	unsigned int lo_idx = chan->pattern_lo_idx;
+	unsigned int hi_idx = chan->pattern_hi_idx;
+	int pattern_len;
+
+	if (!chan->ramp_enabled || chan->pattern_lo_idx == chan->pattern_hi_idx)
+		return;
+
+	pattern_len = hi_idx - lo_idx + 1;
+
+	step = chan->ramp_tick_ms;
+	hi_pause = DIV_ROUND_UP(chan->ramp_hi_pause_ms, step);
+	lo_pause = DIV_ROUND_UP(chan->ramp_lo_pause_ms, step);
+
+	if (!chan->ramp_reverse)
+		conf |= LPG_PATTERN_CONFIG_LO_TO_HI;
+	if (!chan->ramp_oneshot)
+		conf |= LPG_PATTERN_CONFIG_REPEAT;
+	if (chan->ramp_ping_pong)
+		conf |= LPG_PATTERN_CONFIG_TOGGLE;
+	if (chan->ramp_hi_pause_ms)
+		conf |= LPG_PATTERN_CONFIG_PAUSE_HI;
+	if (chan->ramp_lo_pause_ms)
+		conf |= LPG_PATTERN_CONFIG_PAUSE_LO;
+
+	regmap_write(lpg->map, chan->base + LPG_PATTERN_CONFIG_REG, conf);
+	regmap_write(lpg->map, chan->base + LPG_HI_IDX_REG, hi_idx);
+	regmap_write(lpg->map, chan->base + LPG_LO_IDX_REG, lo_idx);
+
+	regmap_write(lpg->map, chan->base + LPG_RAMP_DURATION_REG, step);
+	regmap_write(lpg->map, chan->base + LPG_HI_PAUSE_REG, hi_pause);
+	regmap_write(lpg->map, chan->base + LPG_LO_PAUSE_REG, lo_pause);
+}
+
+#define LPG_ENABLE_CONTROL_OUTPUT		BIT(7)
+#define LPG_ENABLE_CONTROL_BUFFER_TRISTATE	BIT(5)
+#define LPG_ENABLE_CONTROL_SRC_PWM		BIT(2)
+#define LPG_ENABLE_CONTROL_RAMP_GEN		BIT(1)
+
+static void lpg_apply_control(struct lpg_channel *chan)
+{
+	unsigned int ctrl;
+	struct lpg *lpg = chan->lpg;
+
+	ctrl = LPG_ENABLE_CONTROL_BUFFER_TRISTATE;
+
+	if (chan->enabled)
+		ctrl |= LPG_ENABLE_CONTROL_OUTPUT;
+
+	if (chan->pattern_lo_idx != chan->pattern_hi_idx)
+		ctrl |= LPG_ENABLE_CONTROL_RAMP_GEN;
+	else
+		ctrl |= LPG_ENABLE_CONTROL_SRC_PWM;
+
+	regmap_write(lpg->map, chan->base + PWM_ENABLE_CONTROL_REG, ctrl);
+
+	/*
+	 * Due to LPG hardware bug, in the PWM mode, having enabled PWM,
+	 * We have to write PWM values one more time.
+	 */
+	if (chan->enabled)
+		lpg_apply_pwm_value(chan);
+}
+
+#define LPG_SYNC_PWM	BIT(0)
+
+static void lpg_apply_sync(struct lpg_channel *chan)
+{
+	struct lpg *lpg = chan->lpg;
+
+	regmap_write(lpg->map, chan->base + PWM_SYNC_REG, LPG_SYNC_PWM);
+}
+
+static int lpg_parse_dtest(struct lpg *lpg)
+{
+	struct lpg_channel *chan;
+	struct device_node *np = lpg->dev->of_node;
+	int count;
+	int ret;
+	int i;
+
+	count = of_property_count_u32_elems(np, "qcom,dtest");
+	if (count == -EINVAL) {
+		return 0;
+	} else if (count < 0) {
+		ret = count;
+		goto err_malformed;
+	} else if (count != lpg->data->num_channels * 2) {
+		dev_err(lpg->dev, "qcom,dtest needs to be %d items\n",
+			lpg->data->num_channels * 2);
+		return -EINVAL;
+	}
+
+	for (i = 0; i < lpg->data->num_channels; i++) {
+		chan = &lpg->channels[i];
+
+		ret = of_property_read_u32_index(np, "qcom,dtest", i * 2,
+						 &chan->dtest_line);
+		if (ret)
+			goto err_malformed;
+
+		ret = of_property_read_u32_index(np, "qcom,dtest", i * 2 + 1,
+						 &chan->dtest_value);
+		if (ret)
+			goto err_malformed;
+	}
+
+	return 0;
+
+err_malformed:
+	dev_err(lpg->dev, "malformed qcom,dtest\n");
+	return ret;
+}
+
+static void lpg_apply_dtest(struct lpg_channel *chan)
+{
+	struct lpg *lpg = chan->lpg;
+
+	if (!chan->dtest_line)
+		return;
+
+	regmap_write(lpg->map, chan->base + PWM_SEC_ACCESS_REG, 0xa5);
+	regmap_write(lpg->map, chan->base + PWM_DTEST_REG(chan->dtest_line),
+		     chan->dtest_value);
+}
+
+static void lpg_apply(struct lpg_channel *chan)
+{
+	lpg_disable_glitch(chan);
+	lpg_apply_freq(chan);
+	lpg_apply_pwm_value(chan);
+	lpg_apply_control(chan);
+	lpg_apply_sync(chan);
+	lpg_apply_lut_control(chan);
+	lpg_enable_glitch(chan);
+}
+
+static void lpg_brightness_set(struct lpg_led *led, struct led_classdev *cdev,
+			       struct mc_subled *subleds)
+{
+	enum led_brightness brightness;
+	struct lpg_channel *chan;
+	unsigned int triled_enabled = 0;
+	unsigned int triled_mask = 0;
+	unsigned int lut_mask = 0;
+	unsigned int duty_us;
+	struct lpg *lpg = led->lpg;
+	int i;
+
+	for (i = 0; i < led->num_channels; i++) {
+		chan = led->channels[i];
+		brightness = subleds[i].brightness;
+
+		if (brightness == LED_OFF) {
+			chan->enabled = false;
+			chan->ramp_enabled = false;
+		} else if (chan->pattern_lo_idx != chan->pattern_hi_idx) {
+			lpg_calc_freq(chan, NSEC_PER_USEC);
+
+			chan->enabled = true;
+			chan->ramp_enabled = true;
+
+			lut_mask |= chan->lut_mask;
+			triled_enabled |= chan->triled_mask;
+		} else {
+			lpg_calc_freq(chan, NSEC_PER_USEC);
+
+			duty_us = brightness * chan->period_us / cdev->max_brightness;
+			lpg_calc_duty(chan, duty_us);
+			chan->enabled = true;
+			chan->ramp_enabled = false;
+
+			triled_enabled |= chan->triled_mask;
+		}
+
+		triled_mask |= chan->triled_mask;
+
+		lpg_apply(chan);
+	}
+
+	/* Toggle triled lines */
+	if (triled_mask)
+		triled_set(lpg, triled_mask, triled_enabled);
+
+	/* Trigger start of ramp generator(s) */
+	if (lut_mask)
+		lpg_lut_sync(lpg, lut_mask);
+}
+
+static void lpg_brightness_single_set(struct led_classdev *cdev,
+				      enum led_brightness value)
+{
+	struct lpg_led *led = container_of(cdev, struct lpg_led, cdev);
+	struct mc_subled info;
+
+	info.brightness = value;
+	lpg_brightness_set(led, cdev, &info);
+}
+
+static void lpg_brightness_mc_set(struct led_classdev *cdev,
+				  enum led_brightness value)
+{
+	struct led_classdev_mc *mc = lcdev_to_mccdev(cdev);
+	struct lpg_led *led = container_of(mc, struct lpg_led, mcdev);
+
+	led_mc_calc_color_components(mc, value);
+	lpg_brightness_set(led, cdev, mc->subled_info);
+}
+
+static int lpg_blink_set(struct lpg_led *led,
+			 unsigned long *delay_on, unsigned long *delay_off)
+{
+	struct lpg_channel *chan;
+	unsigned int period_us;
+	unsigned int duty_us;
+	int i;
+
+	if (!*delay_on && !*delay_off) {
+		*delay_on = 500;
+		*delay_off = 500;
+	}
+
+	duty_us = *delay_on * USEC_PER_MSEC;
+	period_us = (*delay_on + *delay_off) * USEC_PER_MSEC;
+
+	for (i = 0; i < led->num_channels; i++) {
+		chan = led->channels[i];
+
+		lpg_calc_freq(chan, period_us);
+		lpg_calc_duty(chan, duty_us);
+
+		chan->enabled = true;
+		chan->ramp_enabled = false;
+
+		lpg_apply(chan);
+	}
+
+	return 0;
+}
+
+static int lpg_blink_single_set(struct led_classdev *cdev,
+				unsigned long *delay_on, unsigned long *delay_off)
+{
+	struct lpg_led *led = container_of(cdev, struct lpg_led, cdev);
+
+	return lpg_blink_set(led, delay_on, delay_off);
+}
+
+static int lpg_blink_mc_set(struct led_classdev *cdev,
+			    unsigned long *delay_on, unsigned long *delay_off)
+{
+	struct led_classdev_mc *mc = lcdev_to_mccdev(cdev);
+	struct lpg_led *led = container_of(mc, struct lpg_led, mcdev);
+
+	return lpg_blink_set(led, delay_on, delay_off);
+}
+
+static int lpg_pattern_set(struct lpg_led *led, struct led_pattern *pattern,
+			   u32 len, int repeat)
+{
+	struct lpg_channel *chan;
+	struct lpg *lpg = led->lpg;
+	unsigned int hi_pause;
+	unsigned int lo_pause;
+	unsigned int lo_idx;
+	unsigned int hi_idx;
+	bool ping_pong = true;
+	int brightness_a;
+	int brightness_b;
+	int ret;
+	int i;
+
+	/* Only support oneshot or indefinite loops, due to limited pattern space */
+	if (repeat != -1 && repeat != 1)
+		return -EINVAL;
+
+	/*
+	 * The LPG plays patterns with at a fixed pace, a "low pause" can be
+	 * performed before the pattern and a "high pause" after. In order to
+	 * save space the pattern can be played in "ping pong" mode, in which
+	 * the pattern is first played forward, then "high pause" is applied,
+	 * then the pattern is played backwards and finally the "low pause" is
+	 * applied.
+	 *
+	 * The delta_t of the first entry is used to determine the pace of the
+	 * pattern.
+	 *
+	 * If the specified pattern is a palindrome the ping pong mode is
+	 * enabled. In this scenario the delta_t of the last entry determines
+	 * the "low pause" time and the delta_t of the middle entry (i.e. the
+	 * last in the programmed pattern) determines the "high pause". If the
+	 * pattern consists of an odd number of values, no "high pause" is
+	 * used.
+	 *
+	 * When ping pong mode is not selected, the delta_t of the last entry
+	 * is used as "high pause". No "low pause" is used.
+	 *
+	 * delta_t of any other members of the pattern is ignored.
+	 */
+
+	/* Detect palindromes and use "ping pong" to reduce LUT usage */
+	for (i = 0; i < len / 2; i++) {
+		brightness_a = pattern[i].brightness;
+		brightness_b = pattern[len - i - 1].brightness;
+
+		if (brightness_a != brightness_b) {
+			ping_pong = false;
+			break;
+		}
+	}
+
+	if (ping_pong) {
+		if (len % 2)
+			hi_pause = 0;
+		else
+			hi_pause = pattern[(len + 1) / 2].delta_t;
+		lo_pause = pattern[len - 1].delta_t;
+
+		len = (len + 1) / 2;
+	} else {
+		hi_pause = pattern[len - 1].delta_t;
+		lo_pause = 0;
+	}
+
+	ret = lpg_lut_store(lpg, pattern, len, &lo_idx, &hi_idx);
+	if (ret < 0)
+		return ret;
+
+	for (i = 0; i < led->num_channels; i++) {
+		chan = led->channels[i];
+
+		chan->ramp_tick_ms = pattern[0].delta_t;
+		chan->ramp_ping_pong = ping_pong;
+		chan->ramp_oneshot = repeat != -1;
+
+		chan->ramp_lo_pause_ms = lo_pause;
+		chan->ramp_hi_pause_ms = hi_pause;
+
+		chan->pattern_lo_idx = lo_idx;
+		chan->pattern_hi_idx = hi_idx;
+	}
+
+	return 0;
+}
+
+static int lpg_pattern_single_set(struct led_classdev *cdev,
+				  struct led_pattern *pattern, u32 len,
+				  int repeat)
+{
+	struct lpg_led *led = container_of(cdev, struct lpg_led, cdev);
+	int ret;
+
+	ret = lpg_pattern_set(led, pattern, len, repeat);
+	if (ret < 0)
+		return ret;
+
+	lpg_brightness_single_set(cdev, LED_FULL);
+
+	return 0;
+}
+
+static int lpg_pattern_mc_set(struct led_classdev *cdev,
+			      struct led_pattern *pattern, u32 len,
+			      int repeat)
+{
+	struct led_classdev_mc *mc = lcdev_to_mccdev(cdev);
+	struct lpg_led *led = container_of(mc, struct lpg_led, mcdev);
+	int ret;
+
+	ret = lpg_pattern_set(led, pattern, len, repeat);
+	if (ret < 0)
+		return ret;
+
+	led_mc_calc_color_components(mc, LED_FULL);
+	lpg_brightness_set(led, cdev, mc->subled_info);
+
+	return 0;
+}
+
+static int lpg_pattern_clear(struct lpg_led *led)
+{
+	struct lpg_channel *chan;
+	struct lpg *lpg = led->lpg;
+	int i;
+
+	chan = led->channels[0];
+	lpg_lut_free(lpg, chan->pattern_lo_idx, chan->pattern_hi_idx);
+
+	for (i = 0; i < led->num_channels; i++) {
+		chan = led->channels[i];
+		chan->pattern_lo_idx = 0;
+		chan->pattern_hi_idx = 0;
+	}
+
+	return 0;
+}
+
+static int lpg_pattern_single_clear(struct led_classdev *cdev)
+{
+	struct lpg_led *led = container_of(cdev, struct lpg_led, cdev);
+
+	return lpg_pattern_clear(led);
+}
+
+static int lpg_pattern_mc_clear(struct led_classdev *cdev)
+{
+	struct led_classdev_mc *mc = lcdev_to_mccdev(cdev);
+	struct lpg_led *led = container_of(mc, struct lpg_led, mcdev);
+
+	return lpg_pattern_clear(led);
+}
+
+static int lpg_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+	struct lpg *lpg = container_of(chip, struct lpg, pwm);
+	struct lpg_channel *chan = &lpg->channels[pwm->hwpwm];
+
+	return chan->in_use ? -EBUSY : 0;
+}
+
+static int lpg_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
+			 const struct pwm_state *state)
+{
+	struct lpg *lpg = container_of(chip, struct lpg, pwm);
+	struct lpg_channel *chan = &lpg->channels[pwm->hwpwm];
+
+	lpg_calc_freq(chan, div_u64(state->period, NSEC_PER_USEC));
+	lpg_calc_duty(chan, div_u64(state->duty_cycle, NSEC_PER_USEC));
+	chan->enabled = state->enabled;
+
+	lpg_apply(chan);
+
+	triled_set(lpg, chan->triled_mask, chan->enabled ? chan->triled_mask : 0);
+
+	return 0;
+}
+
+static const struct pwm_ops lpg_pwm_ops = {
+	.request = lpg_pwm_request,
+	.apply = lpg_pwm_apply,
+	.owner = THIS_MODULE,
+};
+
+static int lpg_add_pwm(struct lpg *lpg)
+{
+	int ret;
+
+	lpg->pwm.base = -1;
+	lpg->pwm.dev = lpg->dev;
+	lpg->pwm.npwm = lpg->num_channels;
+	lpg->pwm.ops = &lpg_pwm_ops;
+
+	ret = pwmchip_add(&lpg->pwm);
+	if (ret)
+		dev_err(lpg->dev, "failed to add PWM chip: ret %d\n", ret);
+
+	return ret;
+}
+
+static int lpg_parse_channel(struct lpg *lpg, struct device_node *np,
+			     struct lpg_channel **channel)
+{
+	struct lpg_channel *chan;
+	u32 color = LED_COLOR_ID_GREEN;
+	u32 reg;
+	int ret;
+
+	ret = of_property_read_u32(np, "reg", &reg);
+	if (ret || !reg || reg > lpg->num_channels) {
+		dev_err(lpg->dev, "invalid reg of %pOFn\n", np);
+		return -EINVAL;
+	}
+
+	chan = &lpg->channels[reg - 1];
+	chan->in_use = true;
+
+	ret = of_property_read_u32(np, "color", &color);
+	if (ret < 0 && ret != -EINVAL) {
+		dev_err(lpg->dev, "failed to parse \"color\" of %pOF\n", np);
+		return ret;
+	}
+
+	chan->color = color;
+
+	*channel = chan;
+
+	return 0;
+}
+
+static int lpg_add_led(struct lpg *lpg, struct device_node *np)
+{
+	struct led_classdev *cdev;
+	struct device_node *child;
+	struct mc_subled *info;
+	struct lpg_led *led;
+	const char *state;
+	int num_channels;
+	u32 color = 0;
+	int ret;
+	int i;
+
+	ret = of_property_read_u32(np, "color", &color);
+	if (ret < 0 && ret != -EINVAL) {
+		dev_err(lpg->dev, "failed to parse \"color\" of %pOF\n", np);
+		return ret;
+	}
+
+	if (color == LED_COLOR_ID_MULTI)
+		num_channels = of_get_available_child_count(np);
+	else
+		num_channels = 1;
+
+	led = devm_kzalloc(lpg->dev, struct_size(led, channels, num_channels), GFP_KERNEL);
+	if (!led)
+		return -ENOMEM;
+
+	led->lpg = lpg;
+	led->num_channels = num_channels;
+
+	if (color == LED_COLOR_ID_MULTI) {
+		info = devm_kcalloc(lpg->dev, num_channels, sizeof(*info), GFP_KERNEL);
+		if (!info)
+			return -ENOMEM;
+		i = 0;
+		for_each_available_child_of_node(np, child) {
+			ret = lpg_parse_channel(lpg, child, &led->channels[i]);
+			if (ret < 0)
+				return ret;
+
+			info[i].color_index = led->channels[i]->color;
+			info[i].intensity = LED_FULL;
+			i++;
+		}
+
+		led->mcdev.subled_info = info;
+		led->mcdev.num_colors = num_channels;
+
+		cdev = &led->mcdev.led_cdev;
+		cdev->brightness_set = lpg_brightness_mc_set;
+		cdev->blink_set = lpg_blink_mc_set;
+
+		/* Register pattern accessors only if we have a LUT block */
+		if (lpg->lut_base) {
+			cdev->pattern_set = lpg_pattern_mc_set;
+			cdev->pattern_clear = lpg_pattern_mc_clear;
+		}
+	} else {
+		ret = lpg_parse_channel(lpg, np, &led->channels[0]);
+		if (ret < 0)
+			return ret;
+
+		cdev = &led->cdev;
+		cdev->brightness_set = lpg_brightness_single_set;
+		cdev->blink_set = lpg_blink_single_set;
+
+		/* Register pattern accessors only if we have a LUT block */
+		if (lpg->lut_base) {
+			cdev->pattern_set = lpg_pattern_single_set;
+			cdev->pattern_clear = lpg_pattern_single_clear;
+		}
+	}
+
+	/* Use label else node name */
+	cdev->name = of_get_property(np, "label", NULL) ? : np->name;
+	cdev->default_trigger = of_get_property(np, "linux,default-trigger", NULL);
+	cdev->max_brightness = 255;
+
+	if (!of_property_read_string(np, "default-state", &state) &&
+	    !strcmp(state, "on"))
+		cdev->brightness = LED_FULL;
+	else
+		cdev->brightness = LED_OFF;
+
+	cdev->brightness_set(cdev, cdev->brightness);
+
+	if (color == LED_COLOR_ID_MULTI)
+		ret = devm_led_classdev_multicolor_register(lpg->dev, &led->mcdev);
+	else
+		ret = devm_led_classdev_register(lpg->dev, &led->cdev);
+	if (ret)
+		dev_err(lpg->dev, "unable to register %s\n", cdev->name);
+
+	return ret;
+}
+
+static int lpg_init_channels(struct lpg *lpg)
+{
+	const struct lpg_data *data = lpg->data;
+	int i;
+
+	lpg->num_channels = data->num_channels;
+	lpg->channels = devm_kcalloc(lpg->dev, data->num_channels,
+				     sizeof(struct lpg_channel), GFP_KERNEL);
+	if (!lpg->channels)
+		return -ENOMEM;
+
+	for (i = 0; i < data->num_channels; i++) {
+		lpg->channels[i].lpg = lpg;
+		lpg->channels[i].base = data->channels[i].base;
+		lpg->channels[i].triled_mask = data->channels[i].triled_mask;
+		lpg->channels[i].lut_mask = BIT(i);
+	}
+
+	return 0;
+}
+
+static int lpg_init_triled(struct lpg *lpg)
+{
+	struct device_node *np = lpg->dev->of_node;
+	int ret;
+
+	/* Skip initialization if we don't have a triled block */
+	if (!lpg->data->triled_base)
+		return 0;
+
+	lpg->triled_base = lpg->data->triled_base;
+	lpg->triled_has_atc_ctl = lpg->data->triled_has_atc_ctl;
+	lpg->triled_has_src_sel = lpg->data->triled_has_src_sel;
+
+	if (lpg->triled_has_src_sel) {
+		ret = of_property_read_u32(np, "qcom,power-source", &lpg->triled_src);
+		if (ret || lpg->triled_src == 2 || lpg->triled_src > 3) {
+			dev_err(lpg->dev, "invalid power source\n");
+			return -EINVAL;
+		}
+	}
+
+	/* Disable automatic trickle charge LED */
+	if (lpg->triled_has_atc_ctl)
+		regmap_write(lpg->map, lpg->triled_base + TRI_LED_ATC_CTL, 0);
+
+	/* Configure power source */
+	if (lpg->triled_has_src_sel)
+		regmap_write(lpg->map, lpg->triled_base + TRI_LED_SRC_SEL, lpg->triled_src);
+
+	/* Default all outputs to off */
+	regmap_write(lpg->map, lpg->triled_base + TRI_LED_EN_CTL, 0);
+
+	return 0;
+}
+
+static int lpg_init_lut(struct lpg *lpg)
+{
+	const struct lpg_data *data = lpg->data;
+	size_t bitmap_size;
+
+	if (!data->lut_base)
+		return 0;
+
+	lpg->lut_base = data->lut_base;
+	lpg->lut_size = data->lut_size;
+
+	bitmap_size = BITS_TO_BYTES(lpg->lut_size);
+	lpg->lut_bitmap = devm_kzalloc(lpg->dev, bitmap_size, GFP_KERNEL);
+	if (!lpg->lut_bitmap)
+		return -ENOMEM;
+
+	bitmap_clear(lpg->lut_bitmap, 0, lpg->lut_size);
+
+	return 0;
+}
+
+static int lpg_probe(struct platform_device *pdev)
+{
+	struct device_node *np;
+	struct lpg *lpg;
+	int ret;
+	int i;
+
+	lpg = devm_kzalloc(&pdev->dev, sizeof(*lpg), GFP_KERNEL);
+	if (!lpg)
+		return -ENOMEM;
+
+	lpg->data = of_device_get_match_data(&pdev->dev);
+	if (!lpg->data)
+		return -EINVAL;
+
+	lpg->dev = &pdev->dev;
+
+	lpg->map = dev_get_regmap(pdev->dev.parent, NULL);
+	if (!lpg->map) {
+		dev_err(&pdev->dev, "parent regmap unavailable\n");
+		return -ENXIO;
+	}
+
+	ret = lpg_init_channels(lpg);
+	if (ret < 0)
+		return ret;
+
+	ret = lpg_parse_dtest(lpg);
+	if (ret < 0)
+		return ret;
+
+	ret = lpg_init_triled(lpg);
+	if (ret < 0)
+		return ret;
+
+	ret = lpg_init_lut(lpg);
+	if (ret < 0)
+		return ret;
+
+	for_each_available_child_of_node(pdev->dev.of_node, np) {
+		ret = lpg_add_led(lpg, np);
+		if (ret)
+			return ret;
+	}
+
+	for (i = 0; i < lpg->num_channels; i++)
+		lpg_apply_dtest(&lpg->channels[i]);
+
+	ret = lpg_add_pwm(lpg);
+	if (ret)
+		return ret;
+
+	platform_set_drvdata(pdev, lpg);
+
+	return 0;
+}
+
+static int lpg_remove(struct platform_device *pdev)
+{
+	struct lpg *lpg = platform_get_drvdata(pdev);
+
+	pwmchip_remove(&lpg->pwm);
+
+	return 0;
+}
+
+static const struct lpg_data pm8916_pwm_data = {
+	.pwm_9bit_mask = BIT(2),
+
+	.num_channels = 1,
+	.channels = (struct lpg_channel_data[]) {
+		{ .base = 0xbc00 },
+	},
+};
+
+static const struct lpg_data pm8941_lpg_data = {
+	.lut_base = 0xb000,
+	.lut_size = 64,
+
+	.triled_base = 0xd000,
+	.triled_has_atc_ctl = true,
+	.triled_has_src_sel = true,
+
+	.pwm_9bit_mask = 3 << 4,
+
+	.num_channels = 8,
+	.channels = (struct lpg_channel_data[]) {
+		{ .base = 0xb100 },
+		{ .base = 0xb200 },
+		{ .base = 0xb300 },
+		{ .base = 0xb400 },
+		{ .base = 0xb500, .triled_mask = BIT(5) },
+		{ .base = 0xb600, .triled_mask = BIT(6) },
+		{ .base = 0xb700, .triled_mask = BIT(7) },
+		{ .base = 0xb800 },
+	},
+};
+
+static const struct lpg_data pm8994_lpg_data = {
+	.lut_base = 0xb000,
+	.lut_size = 64,
+
+	.pwm_9bit_mask = 3 << 4,
+
+	.num_channels = 6,
+	.channels = (struct lpg_channel_data[]) {
+		{ .base = 0xb100 },
+		{ .base = 0xb200 },
+		{ .base = 0xb300 },
+		{ .base = 0xb400 },
+		{ .base = 0xb500 },
+		{ .base = 0xb600 },
+	},
+};
+
+static const struct lpg_data pmi8994_lpg_data = {
+	.lut_base = 0xb000,
+	.lut_size = 24,
+
+	.triled_base = 0xd000,
+	.triled_has_atc_ctl = true,
+	.triled_has_src_sel = true,
+
+	.pwm_9bit_mask = BIT(4),
+
+	.num_channels = 4,
+	.channels = (struct lpg_channel_data[]) {
+		{ .base = 0xb100, .triled_mask = BIT(5) },
+		{ .base = 0xb200, .triled_mask = BIT(6) },
+		{ .base = 0xb300, .triled_mask = BIT(7) },
+		{ .base = 0xb400 },
+	},
+};
+
+static const struct lpg_data pmi8998_lpg_data = {
+	.lut_base = 0xb000,
+	.lut_size = 49,
+
+	.triled_base = 0xd000,
+
+	.pwm_9bit_mask = BIT(4),
+
+	.num_channels = 6,
+	.channels = (struct lpg_channel_data[]) {
+		{ .base = 0xb100 },
+		{ .base = 0xb200 },
+		{ .base = 0xb300, .triled_mask = BIT(5) },
+		{ .base = 0xb400, .triled_mask = BIT(6) },
+		{ .base = 0xb500, .triled_mask = BIT(7) },
+		{ .base = 0xb600 },
+	},
+};
+
+static const struct lpg_data pm8150b_lpg_data = {
+	.lut_base = 0xb000,
+	.lut_size = 49,
+
+	.triled_base = 0xd000,
+
+	.pwm_9bit_mask = BIT(4),
+
+	.num_channels = 2,
+	.channels = (struct lpg_channel_data[]) {
+		{ .base = 0xb100, .triled_mask = BIT(7) },
+		{ .base = 0xb200, .triled_mask = BIT(6) },
+	},
+};
+
+static const struct lpg_data pm8150l_lpg_data = {
+	.lut_base = 0xb000,
+	.lut_size = 49,
+
+	.triled_base = 0xd000,
+
+	.pwm_9bit_mask = BIT(4),
+
+	.num_channels = 5,
+	.channels = (struct lpg_channel_data[]) {
+		{ .base = 0xb100, .triled_mask = BIT(7) },
+		{ .base = 0xb200, .triled_mask = BIT(6) },
+		{ .base = 0xb300, .triled_mask = BIT(5) },
+		{ .base = 0xbc00 },
+		{ .base = 0xbd00 },
+
+	},
+};
+
+static const struct of_device_id lpg_of_table[] = {
+	{ .compatible = "qcom,pm8150b-lpg", .data = &pm8150b_lpg_data },
+	{ .compatible = "qcom,pm8150l-lpg", .data = &pm8150l_lpg_data },
+	{ .compatible = "qcom,pm8916-pwm", .data = &pm8916_pwm_data },
+	{ .compatible = "qcom,pm8941-lpg", .data = &pm8941_lpg_data },
+	{ .compatible = "qcom,pm8994-lpg", .data = &pm8994_lpg_data },
+	{ .compatible = "qcom,pmi8994-lpg", .data = &pmi8994_lpg_data },
+	{ .compatible = "qcom,pmi8998-lpg", .data = &pmi8998_lpg_data },
+	{}
+};
+MODULE_DEVICE_TABLE(of, lpg_of_table);
+
+static struct platform_driver lpg_driver = {
+	.probe = lpg_probe,
+	.remove = lpg_remove,
+	.driver = {
+		.name = "qcom-spmi-lpg",
+		.of_match_table = lpg_of_table,
+	},
+};
+module_platform_driver(lpg_driver);
+
+MODULE_DESCRIPTION("Qualcomm LPG LED driver");
+MODULE_LICENSE("GPL v2");
-- 
2.29.2

Re: [PATCH v7 2/6] leds: Add driver for Qualcomm LPG

[Marijn Suijten]

Hi Bjorn,

On 4/29/21 11:15 PM, Bjorn Andersson wrote:
> The Light Pulse Generator (LPG) is a PWM-block found in a wide range of
> PMICs from Qualcomm. It can operate on fixed parameters or based on a
> lookup-table, altering the duty cycle over time - which provides the
> means for e.g. hardware assisted transitions of LED brightness.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---
> 
> Changes since v6:
> - Moved code into drivers/leds/rgb/
> - Reverted to earlier qcom,dtest handling to support routing pwm signals
>    through dtest lines.
> - Remember the duration of each step of the pattern, rather than adding up and
>    then dividing when the value is used.
> - Added missing error prints on DT parse errors.
> - Added sm8150[lb] and made led source and atc presence optional
> - Added missing parenthesis around (len + 1) / 2 in search for hi_pause in the
>    pattern.
> 
>   drivers/leds/Kconfig             |    3 +
>   drivers/leds/Makefile            |    3 +
>   drivers/leds/rgb/leds-qcom-lpg.c | 1286 ++++++++++++++++++++++++++++++
>   3 files changed, 1292 insertions(+)
>   create mode 100644 drivers/leds/rgb/leds-qcom-lpg.c
> 
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index 49d99cb084db..8ab06b3f162d 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -933,6 +933,9 @@ source "drivers/leds/blink/Kconfig"
>   comment "Flash and Torch LED drivers"
>   source "drivers/leds/flash/Kconfig"
>   
> +comment "RGB LED drivers"
> +source "drivers/leds/rgb/Kconfig"


It looks like this file is not included in any of the patches.

> +
>   comment "LED Triggers"
>   source "drivers/leds/trigger/Kconfig"
>   
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index 7e604d3028c8..8cad0465aae0 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -106,6 +106,9 @@ obj-$(CONFIG_LEDS_USER)			+= uleds.o
>   # Flash and Torch LED Drivers
>   obj-$(CONFIG_LEDS_CLASS_FLASH)		+= flash/
>   
> +# RGB LED Drivers
> +obj-$(CONFIG_LEDS_CLASS_MULTICOLOR)	+= rgb/


This file appears to be missing from this patch(set), too.

> +static int lpg_lut_store(struct lpg *lpg, struct led_pattern *pattern,
> +			 size_t len, unsigned int *lo_idx, unsigned int *hi_idx)
> +{
> +	unsigned int idx;
> +	u16 val;
> +	int i;
> +
> +	/* Hardware does not behave when LO_IDX == HI_IDX */
> +	if (len == 1)
> +		return -EINVAL;
> +
> +	idx = bitmap_find_next_zero_area(lpg->lut_bitmap, lpg->lut_size,
> +					 0, len, 0);
> +	if (idx >= lpg->lut_size)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < len; i++) {
> +		val = pattern[i].brightness;
> +
> +		regmap_bulk_write(lpg->map, lpg->lut_base + LPG_LUT_REG(idx + i), &val, 1);


This and the other regmap_bulk_write in lpg_apply_pwm_value used 
sizeof(val) before.  As far as I'm aware qcom-spmi-pmic specifies 16-bit 
addresses (.reg_bits) but 8-bit register sizes (.val_bits).  Writing one 
register means only 8 out of 16 bits in u16 val are written?

> +static void lpg_apply_lut_control(struct lpg_channel *chan)
> +{
> +	struct lpg *lpg = chan->lpg;
> +	unsigned int hi_pause;
> +	unsigned int lo_pause;
> +	unsigned int step;
> +	unsigned int conf = 0;
> +	unsigned int lo_idx = chan->pattern_lo_idx;
> +	unsigned int hi_idx = chan->pattern_hi_idx;
> +	int pattern_len;
> +
> +	if (!chan->ramp_enabled || chan->pattern_lo_idx == chan->pattern_hi_idx)
> +		return;
> +
> +	pattern_len = hi_idx - lo_idx + 1 > +
> +	step = chan->ramp_tick_ms;


Since this is not dividing a full pattern duration by pattern_len 
anymore, that variable is now never read and best removed.

> +static int lpg_parse_channel(struct lpg *lpg, struct device_node *np,
> +			     struct lpg_channel **channel)
> +{
> +	struct lpg_channel *chan;
> +	u32 color = LED_COLOR_ID_GREEN;
> +	u32 reg;
> +	int ret;
> +
> +	ret = of_property_read_u32(np, "reg", &reg);
> +	if (ret || !reg || reg > lpg->num_channels) {
> +		dev_err(lpg->dev, "invalid reg of %pOFn\n", np);


Like \"color\" below, escape reg with \"reg\"?

> +static int lpg_add_led(struct lpg *lpg, struct device_node *np)
> +{
> +	struct led_classdev *cdev;
> +	struct device_node *child;
> +	struct mc_subled *info;
> +	struct lpg_led *led;
> +	const char *state;
> +	int num_channels;
> +	u32 color = 0;
> +	int ret;
> +	int i;
> +
> +	ret = of_property_read_u32(np, "color", &color);
> +	if (ret < 0 && ret != -EINVAL) {
> +		dev_err(lpg->dev, "failed to parse \"color\" of %pOF\n", np);
> +		return ret;
> +	}
> +
> +	if (color == LED_COLOR_ID_MULTI)


Since this driver now lives under rgb/, and is specifically for RGB leds 
(afaik), should this and the rest of the code use LED_COLOR_ID_RGB 
instead?  There was a patch floating around on (if I remember correctly) 
##linux-msm by Luca Weiss that performs the conversion, with some 
related changes.

> +static int lpg_init_lut(struct lpg *lpg)
> +{
> +	const struct lpg_data *data = lpg->data;
> +	size_t bitmap_size;
> +
> +	if (!data->lut_base)
> +		return 0;
> +
> +	lpg->lut_base = data->lut_base;
> +	lpg->lut_size = data->lut_size;
> +
> +	bitmap_size = BITS_TO_BYTES(lpg->lut_size);
> +	lpg->lut_bitmap = devm_kzalloc(lpg->dev, bitmap_size, GFP_KERNEL);
> +	if (!lpg->lut_bitmap)
> +		return -ENOMEM;
> +
> +	bitmap_clear(lpg->lut_bitmap, 0, lpg->lut_size);


devm_kzalloc already zeroes the bitmap.  Is it necessary to clear it 
again (assuming a "cleared" bitmap is implementation-dependent and does 
not imply zeroed memory) or could the memory be allocated with 
devm_kalloc instead?

Thanks!
Marijn

Re: [PATCH v7 2/6] leds: Add driver for Qualcomm LPG

[Bjorn Andersson]

On Sat 01 May 16:09 CDT 2021, Marijn Suijten wrote:

> Hi Bjorn,
> 
> On 4/29/21 11:15 PM, Bjorn Andersson wrote:
> > The Light Pulse Generator (LPG) is a PWM-block found in a wide range of
> > PMICs from Qualcomm. It can operate on fixed parameters or based on a
> > lookup-table, altering the duty cycle over time - which provides the
> > means for e.g. hardware assisted transitions of LED brightness.
> > 
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> > ---
> > 
> > Changes since v6:
> > - Moved code into drivers/leds/rgb/
> > - Reverted to earlier qcom,dtest handling to support routing pwm signals
> >    through dtest lines.
> > - Remember the duration of each step of the pattern, rather than adding up and
> >    then dividing when the value is used.
> > - Added missing error prints on DT parse errors.
> > - Added sm8150[lb] and made led source and atc presence optional
> > - Added missing parenthesis around (len + 1) / 2 in search for hi_pause in the
> >    pattern.
> > 
> >   drivers/leds/Kconfig             |    3 +
> >   drivers/leds/Makefile            |    3 +
> >   drivers/leds/rgb/leds-qcom-lpg.c | 1286 ++++++++++++++++++++++++++++++
> >   3 files changed, 1292 insertions(+)
> >   create mode 100644 drivers/leds/rgb/leds-qcom-lpg.c
> > 
> > diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> > index 49d99cb084db..8ab06b3f162d 100644
> > --- a/drivers/leds/Kconfig
> > +++ b/drivers/leds/Kconfig
> > @@ -933,6 +933,9 @@ source "drivers/leds/blink/Kconfig"
> >   comment "Flash and Torch LED drivers"
> >   source "drivers/leds/flash/Kconfig"
> > +comment "RGB LED drivers"
> > +source "drivers/leds/rgb/Kconfig"
> 
> 
> It looks like this file is not included in any of the patches.
> 

Sorry about that, seems like I missed adding them to the commit :(

> > +
> >   comment "LED Triggers"
> >   source "drivers/leds/trigger/Kconfig"
> > diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> > index 7e604d3028c8..8cad0465aae0 100644
> > --- a/drivers/leds/Makefile
> > +++ b/drivers/leds/Makefile
> > @@ -106,6 +106,9 @@ obj-$(CONFIG_LEDS_USER)			+= uleds.o
> >   # Flash and Torch LED Drivers
> >   obj-$(CONFIG_LEDS_CLASS_FLASH)		+= flash/
> > +# RGB LED Drivers
> > +obj-$(CONFIG_LEDS_CLASS_MULTICOLOR)	+= rgb/
> 
> 
> This file appears to be missing from this patch(set), too.
> 

Right, missed both the new files.

> > +static int lpg_lut_store(struct lpg *lpg, struct led_pattern *pattern,
> > +			 size_t len, unsigned int *lo_idx, unsigned int *hi_idx)
> > +{
> > +	unsigned int idx;
> > +	u16 val;
> > +	int i;
> > +
> > +	/* Hardware does not behave when LO_IDX == HI_IDX */
> > +	if (len == 1)
> > +		return -EINVAL;
> > +
> > +	idx = bitmap_find_next_zero_area(lpg->lut_bitmap, lpg->lut_size,
> > +					 0, len, 0);
> > +	if (idx >= lpg->lut_size)
> > +		return -ENOMEM;
> > +
> > +	for (i = 0; i < len; i++) {
> > +		val = pattern[i].brightness;
> > +
> > +		regmap_bulk_write(lpg->map, lpg->lut_base + LPG_LUT_REG(idx + i), &val, 1);
> 
> 
> This and the other regmap_bulk_write in lpg_apply_pwm_value used sizeof(val)
> before.  As far as I'm aware qcom-spmi-pmic specifies 16-bit addresses
> (.reg_bits) but 8-bit register sizes (.val_bits).  Writing one register
> means only 8 out of 16 bits in u16 val are written?
> 

You're right and I should have used test pattern that shown that I lost
that 9th bit...

I'll restore the sizeof()

> > +static void lpg_apply_lut_control(struct lpg_channel *chan)
> > +{
> > +	struct lpg *lpg = chan->lpg;
> > +	unsigned int hi_pause;
> > +	unsigned int lo_pause;
> > +	unsigned int step;
> > +	unsigned int conf = 0;
> > +	unsigned int lo_idx = chan->pattern_lo_idx;
> > +	unsigned int hi_idx = chan->pattern_hi_idx;
> > +	int pattern_len;
> > +
> > +	if (!chan->ramp_enabled || chan->pattern_lo_idx == chan->pattern_hi_idx)
> > +		return;
> > +
> > +	pattern_len = hi_idx - lo_idx + 1 > +
> > +	step = chan->ramp_tick_ms;
> 
> 
> Since this is not dividing a full pattern duration by pattern_len anymore,
> that variable is now never read and best removed.
> 

Ok

> > +static int lpg_parse_channel(struct lpg *lpg, struct device_node *np,
> > +			     struct lpg_channel **channel)
> > +{
> > +	struct lpg_channel *chan;
> > +	u32 color = LED_COLOR_ID_GREEN;
> > +	u32 reg;
> > +	int ret;
> > +
> > +	ret = of_property_read_u32(np, "reg", &reg);
> > +	if (ret || !reg || reg > lpg->num_channels) {
> > +		dev_err(lpg->dev, "invalid reg of %pOFn\n", np);
> 
> 
> Like \"color\" below, escape reg with \"reg\"?
> 

Sounds good.

> > +static int lpg_add_led(struct lpg *lpg, struct device_node *np)
> > +{
> > +	struct led_classdev *cdev;
> > +	struct device_node *child;
> > +	struct mc_subled *info;
> > +	struct lpg_led *led;
> > +	const char *state;
> > +	int num_channels;
> > +	u32 color = 0;
> > +	int ret;
> > +	int i;
> > +
> > +	ret = of_property_read_u32(np, "color", &color);
> > +	if (ret < 0 && ret != -EINVAL) {
> > +		dev_err(lpg->dev, "failed to parse \"color\" of %pOF\n", np);
> > +		return ret;
> > +	}
> > +
> > +	if (color == LED_COLOR_ID_MULTI)
> 
> 
> Since this driver now lives under rgb/, and is specifically for RGB leds
> (afaik), should this and the rest of the code use LED_COLOR_ID_RGB instead?
> There was a patch floating around on (if I remember correctly) ##linux-msm
> by Luca Weiss that performs the conversion, with some related changes.
> 

I thought MULTICOLOR was the right color, but reading the comment on the
defines it seems RGB is the color I actually want. Will check out
z3ntu's changes as well.

> > +static int lpg_init_lut(struct lpg *lpg)
> > +{
> > +	const struct lpg_data *data = lpg->data;
> > +	size_t bitmap_size;
> > +
> > +	if (!data->lut_base)
> > +		return 0;
> > +
> > +	lpg->lut_base = data->lut_base;
> > +	lpg->lut_size = data->lut_size;
> > +
> > +	bitmap_size = BITS_TO_BYTES(lpg->lut_size);
> > +	lpg->lut_bitmap = devm_kzalloc(lpg->dev, bitmap_size, GFP_KERNEL);
> > +	if (!lpg->lut_bitmap)
> > +		return -ENOMEM;
> > +
> > +	bitmap_clear(lpg->lut_bitmap, 0, lpg->lut_size);
> 
> 
> devm_kzalloc already zeroes the bitmap.  Is it necessary to clear it again
> (assuming a "cleared" bitmap is implementation-dependent and does not imply
> zeroed memory) or could the memory be allocated with devm_kalloc instead?
> 

You're right, I can drop the explicit clear of the bitmap.

Thanks,
Bjorn

Re: [PATCH v7 2/6] leds: Add driver for Qualcomm LPG

[Subbaraman Narayanamurthy]

On 4/29/21 2:15 PM, Bjorn Andersson wrote:
> The Light Pulse Generator (LPG) is a PWM-block found in a wide range of
> PMICs from Qualcomm. It can operate on fixed parameters or based on a
> lookup-table, altering the duty cycle over time - which provides the
> means for e.g. hardware assisted transitions of LED brightness.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---
>
> Changes since v6:
> - Moved code into drivers/leds/rgb/
> - Reverted to earlier qcom,dtest handling to support routing pwm signals
>   through dtest lines.
> - Remember the duration of each step of the pattern, rather than adding up and
>   then dividing when the value is used.
> - Added missing error prints on DT parse errors.
> - Added sm8150[lb] and made led source and atc presence optional
> - Added missing parenthesis around (len + 1) / 2 in search for hi_pause in the
>   pattern.
>
>  drivers/leds/Kconfig             |    3 +
>  drivers/leds/Makefile            |    3 +
>  drivers/leds/rgb/leds-qcom-lpg.c | 1286 ++++++++++++++++++++++++++++++
>  3 files changed, 1292 insertions(+)
>  create mode 100644 drivers/leds/rgb/leds-qcom-lpg.c
>
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index 49d99cb084db..8ab06b3f162d 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -933,6 +933,9 @@ source "drivers/leds/blink/Kconfig"
>  comment "Flash and Torch LED drivers"
>  source "drivers/leds/flash/Kconfig"
>  
> +comment "RGB LED drivers"
> +source "drivers/leds/rgb/Kconfig"


Are you planning to add "drivers/leds/rgb/Kconfig" and "drivers/leds/rgb/Makefile" as a separate change?


> +
>  comment "LED Triggers"
>  source "drivers/leds/trigger/Kconfig"
>  
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index 7e604d3028c8..8cad0465aae0 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -106,6 +106,9 @@ obj-$(CONFIG_LEDS_USER)			+= uleds.o
>  # Flash and Torch LED Drivers
>  obj-$(CONFIG_LEDS_CLASS_FLASH)		+= flash/
>  
> +# RGB LED Drivers
> +obj-$(CONFIG_LEDS_CLASS_MULTICOLOR)	+= rgb/
> +
>  # LED Triggers
>  obj-$(CONFIG_LEDS_TRIGGERS)		+= trigger/
>  
> diff --git a/drivers/leds/rgb/leds-qcom-lpg.c b/drivers/leds/rgb/leds-qcom-lpg.c
> new file mode 100644
> index 000000000000..c68233b43c2c
> --- /dev/null
> +++ b/drivers/leds/rgb/leds-qcom-lpg.c
> @@ -0,0 +1,1286 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2017-2021 Linaro Ltd
> + * Copyright (c) 2010-2012, The Linux Foundation. All rights reserved.
> + */
> +#include <linux/bits.h>
> +#include <linux/led-class-multicolor.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/pwm.h>
> +#include <linux/regmap.h>
> +#include <linux/slab.h>
> +
> +#define LPG_PATTERN_CONFIG_REG	0x40
> +#define LPG_SIZE_CLK_REG	0x41
> +#define LPG_PREDIV_CLK_REG	0x42
> +#define PWM_TYPE_CONFIG_REG	0x43
> +#define PWM_VALUE_REG		0x44
> +#define PWM_ENABLE_CONTROL_REG	0x46
> +#define PWM_SYNC_REG		0x47
> +#define LPG_RAMP_DURATION_REG	0x50
> +#define LPG_HI_PAUSE_REG	0x52
> +#define LPG_LO_PAUSE_REG	0x54
> +#define LPG_HI_IDX_REG		0x56
> +#define LPG_LO_IDX_REG		0x57
> +#define PWM_SEC_ACCESS_REG	0xd0
> +#define PWM_DTEST_REG(x)	(0xe2 + (x) - 1)
> +
> +#define TRI_LED_SRC_SEL		0x45
> +#define TRI_LED_EN_CTL		0x46
> +#define TRI_LED_ATC_CTL		0x47
> +
> +#define LPG_LUT_REG(x)		(0x40 + (x) * 2)
> +#define RAMP_CONTROL_REG	0xc8
> +
> +struct lpg_channel;
> +struct lpg_data;
> +
> +/**
> + * struct lpg - LPG device context
> + * @dev:	struct device for LPG device
> + * @map:	regmap for register access
> + * @pwm:	PWM-chip object, if operating in PWM mode
> + * @lut_base:	base address of the LUT block (optional)
> + * @lut_size:	number of entries in the LUT block
> + * @lut_bitmap:	allocation bitmap for LUT entries
> + * @triled_base: base address of the TRILED block (optional)
> + * @triled_src:	power-source for the TRILED
> + * @triled_has_atc_ctl:	true if there is TRI_LED_ATC_CTL register
> + * @triled_has_src_sel:	true if there is TRI_LED_SRC_SEL register
> + * @channels:	list of PWM channels
> + * @num_channels: number of @channels
> + */
> +struct lpg {
> +	struct device *dev;
> +	struct regmap *map;
> +
> +	struct pwm_chip pwm;
> +
> +	const struct lpg_data *data;
> +
> +	u32 lut_base;
> +	u32 lut_size;
> +	unsigned long *lut_bitmap;
> +
> +	u32 triled_base;
> +	u32 triled_src;
> +	bool triled_has_atc_ctl;
> +	bool triled_has_src_sel;
> +
> +	struct lpg_channel *channels;
> +	unsigned int num_channels;
> +};
> +
> +/**
> + * struct lpg_channel - per channel data
> + * @lpg:	reference to parent lpg
> + * @base:	base address of the PWM channel
> + * @triled_mask: mask in TRILED to enable this channel
> + * @lut_mask:	mask in LUT to start pattern generator for this channel
> + * @in_use:	channel is exposed to LED framework
> + * @color:	color of the LED attached to this channel
> + * @dtest_line:	DTEST line for output, or 0 if disabled
> + * @dtest_value: DTEST line configuration
> + * @pwm_value:	duty (in microseconds) of the generated pulses, overridden by LUT
> + * @enabled:	output enabled?
> + * @period_us:	period (in microseconds) of the generated pulses
> + * @pwm_size:	resolution of the @pwm_value, 6 or 9 bits
> + * @clk:	base frequency of the clock generator
> + * @pre_div:	divider of @clk
> + * @pre_div_exp: exponential divider of @clk
> + * @ramp_enabled: duty cycle is driven by iterating over lookup table
> + * @ramp_ping_pong: reverse through pattern, rather than wrapping to start
> + * @ramp_oneshot: perform only a single pass over the pattern
> + * @ramp_reverse: iterate over pattern backwards
> + * @ramp_tick_ms: length (in milliseconds) of one step in the pattern
> + * @ramp_lo_pause_ms: pause (in milliseconds) before iterating over pattern
> + * @ramp_hi_pause_ms: pause (in milliseconds) after iterating over pattern
> + * @pattern_lo_idx: start index of associated pattern
> + * @pattern_hi_idx: last index of associated pattern
> + */
> +struct lpg_channel {
> +	struct lpg *lpg;
> +
> +	u32 base;
> +	unsigned int triled_mask;
> +	unsigned int lut_mask;
> +
> +	bool in_use;
> +
> +	int color;
> +
> +	u32 dtest_line;
> +	u32 dtest_value;
> +
> +	u16 pwm_value;
> +	bool enabled;
> +
> +	unsigned int period_us;
> +	unsigned int pwm_size;
> +	unsigned int clk;
> +	unsigned int pre_div;
> +	unsigned int pre_div_exp;
> +
> +	bool ramp_enabled;
> +	bool ramp_ping_pong;
> +	bool ramp_oneshot;
> +	bool ramp_reverse;
> +	unsigned long ramp_tick_ms;
> +	unsigned long ramp_lo_pause_ms;
> +	unsigned long ramp_hi_pause_ms;
> +
> +	unsigned int pattern_lo_idx;
> +	unsigned int pattern_hi_idx;
> +};
> +
> +/**
> + * struct lpg_led - logical LED object
> + * @lpg:		lpg context reference
> + * @cdev:		LED class device
> + * @mcdev:		Multicolor LED class device
> + * @num_channels:	number of @channels
> + * @channels:		list of channels associated with the LED
> + */
> +struct lpg_led {
> +	struct lpg *lpg;
> +
> +	struct led_classdev cdev;
> +	struct led_classdev_mc mcdev;
> +
> +	unsigned int num_channels;
> +	struct lpg_channel *channels[];
> +};
> +
> +/**
> + * struct lpg_channel_data - per channel initialization data
> + * @base:		base address for PWM channel registers
> + * @triled_mask:	bitmask for controlling this channel in TRILED
> + */
> +struct lpg_channel_data {
> +	unsigned int base;
> +	u8 triled_mask;
> +};
> +
> +/**
> + * struct lpg_data - initialization data
> + * @lut_base:		base address of LUT block
> + * @lut_size:		number of entries in LUT
> + * @triled_base:	base address of TRILED
> + * @triled_has_atc_ctl:	true if there is TRI_LED_ATC_CTL register
> + * @triled_has_src_sel:	true if there is TRI_LED_SRC_SEL register
> + * @pwm_9bit_mask:	bitmask for switching from 6bit to 9bit pwm
> + * @num_channels:	number of channels in LPG
> + * @channels:		list of channel initialization data
> + */
> +struct lpg_data {
> +	unsigned int lut_base;
> +	unsigned int lut_size;
> +	unsigned int triled_base;
> +	bool triled_has_atc_ctl;
> +	bool triled_has_src_sel;
> +	unsigned int pwm_9bit_mask;
> +	int num_channels;
> +	struct lpg_channel_data *channels;
> +};
> +
> +static int triled_set(struct lpg *lpg, unsigned int mask, unsigned int enable)
> +{
> +	/* Skip if we don't have a triled block */
> +	if (!lpg->triled_base)
> +		return 0;
> +
> +	return regmap_update_bits(lpg->map, lpg->triled_base + TRI_LED_EN_CTL,
> +				  mask, enable);
> +}
> +
> +static int lpg_lut_store(struct lpg *lpg, struct led_pattern *pattern,
> +			 size_t len, unsigned int *lo_idx, unsigned int *hi_idx)
> +{
> +	unsigned int idx;
> +	u16 val;
> +	int i;
> +
> +	/* Hardware does not behave when LO_IDX == HI_IDX */
> +	if (len == 1)
> +		return -EINVAL;
> +
> +	idx = bitmap_find_next_zero_area(lpg->lut_bitmap, lpg->lut_size,
> +					 0, len, 0);
> +	if (idx >= lpg->lut_size)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < len; i++) {
> +		val = pattern[i].brightness;
> +
> +		regmap_bulk_write(lpg->map, lpg->lut_base + LPG_LUT_REG(idx + i), &val, 1);
> +	}
> +
> +	bitmap_set(lpg->lut_bitmap, idx, len);
> +
> +	*lo_idx = idx;
> +	*hi_idx = idx + len - 1;
> +
> +	return 0;
> +}
> +
> +static void lpg_lut_free(struct lpg *lpg, unsigned int lo_idx, unsigned int hi_idx)
> +{
> +	int len;
> +
> +	if (lo_idx == hi_idx)
> +		return;
> +
> +	len = hi_idx - lo_idx + 1;
> +	bitmap_clear(lpg->lut_bitmap, lo_idx, len);
> +}
> +
> +static int lpg_lut_sync(struct lpg *lpg, unsigned int mask)
> +{
> +	return regmap_write(lpg->map, lpg->lut_base + RAMP_CONTROL_REG, mask);
> +}
> +
> +#define NUM_PWM_PREDIV	4
> +#define NUM_PWM_CLK	3
> +#define NUM_EXP		7
> +
> +static const unsigned int lpg_clk_table[NUM_PWM_PREDIV][NUM_PWM_CLK] = {
> +	{
> +		1 * (NSEC_PER_SEC / 1024),
> +		1 * (NSEC_PER_SEC / 32768),
> +		1 * (NSEC_PER_SEC / 19200000),
> +	},
> +	{
> +		3 * (NSEC_PER_SEC / 1024),
> +		3 * (NSEC_PER_SEC / 32768),
> +		3 * (NSEC_PER_SEC / 19200000),
> +	},
> +	{
> +		5 * (NSEC_PER_SEC / 1024),
> +		5 * (NSEC_PER_SEC / 32768),
> +		5 * (NSEC_PER_SEC / 19200000),
> +	},
> +	{
> +		6 * (NSEC_PER_SEC / 1024),
> +		6 * (NSEC_PER_SEC / 32768),
> +		6 * (NSEC_PER_SEC / 19200000),
> +	},
> +};
> +
> +/*
> + * PWM Frequency = Clock Frequency / (N * T)
> + *      or
> + * PWM Period = Clock Period * (N * T)
> + *      where
> + * N = 2^9 or 2^6 for 9-bit or 6-bit PWM size
> + * T = Pre-divide * 2^m, where m = 0..7 (exponent)
> + *
> + * This is the formula to figure out m for the best pre-divide and clock:
> + * (PWM Period / N) = (Pre-divide * Clock Period) * 2^m
> + */
> +static void lpg_calc_freq(struct lpg_channel *chan, unsigned int period_us)
> +{
> +	int             n, m, clk, div;
> +	int             best_m, best_div, best_clk;
> +	unsigned int    last_err, cur_err, min_err;
> +	unsigned int    tmp_p, period_n;
> +
> +	if (period_us == chan->period_us)
> +		return;
> +
> +	/* PWM Period / N */
> +	if (period_us < UINT_MAX / NSEC_PER_USEC)
> +		n = 6;
> +	else
> +		n = 9;
> +
> +	period_n = ((u64)period_us * NSEC_PER_USEC) >> n;
> +
> +	min_err = UINT_MAX;
> +	last_err = UINT_MAX;
> +	best_m = 0;
> +	best_clk = 0;
> +	best_div = 0;
> +	for (clk = 0; clk < NUM_PWM_CLK; clk++) {
> +		for (div = 0; div < NUM_PWM_PREDIV; div++) {
> +			/* period_n = (PWM Period / N) */
> +			/* tmp_p = (Pre-divide * Clock Period) * 2^m */
> +			tmp_p = lpg_clk_table[div][clk];
> +			for (m = 0; m <= NUM_EXP; m++) {
> +				cur_err = abs(period_n - tmp_p);
> +				if (cur_err < min_err) {
> +					min_err = cur_err;
> +					best_m = m;
> +					best_clk = clk;
> +					best_div = div;
> +				}
> +
> +				if (m && cur_err > last_err)
> +					/* Break for bigger cur_err */
> +					break;
> +
> +				last_err = cur_err;
> +				tmp_p <<= 1;
> +			}
> +		}
> +	}
> +
> +	/* Use higher resolution */
> +	if (best_m >= 3 && n == 6) {
> +		n += 3;
> +		best_m -= 3;
> +	}
> +
> +	chan->clk = best_clk;
> +	chan->pre_div = best_div;
> +	chan->pre_div_exp = best_m;
> +	chan->pwm_size = n;
> +
> +	chan->period_us = period_us;
> +}
> +
> +static void lpg_calc_duty(struct lpg_channel *chan, unsigned int duty_us)
> +{
> +	unsigned int max = (1 << chan->pwm_size) - 1;
> +	unsigned int val = div_u64((u64)duty_us << chan->pwm_size, chan->period_us);
> +
> +	chan->pwm_value = min(val, max);
> +}
> +
> +static void lpg_apply_freq(struct lpg_channel *chan)
> +{
> +	unsigned long val;
> +	struct lpg *lpg = chan->lpg;
> +
> +	if (!chan->enabled)
> +		return;
> +
> +	/* Clock register values are off-by-one from lpg_clk_table */
> +	val = chan->clk + 1;
> +
> +	if (chan->pwm_size == 9)
> +		val |= lpg->data->pwm_9bit_mask;
> +
> +	regmap_write(lpg->map, chan->base + LPG_SIZE_CLK_REG, val);
> +
> +	val = chan->pre_div << 5 | chan->pre_div_exp;
> +	regmap_write(lpg->map, chan->base + LPG_PREDIV_CLK_REG, val);
> +}
> +
> +#define LPG_ENABLE_GLITCH_REMOVAL	BIT(5)
> +
> +static void lpg_enable_glitch(struct lpg_channel *chan)
> +{
> +	struct lpg *lpg = chan->lpg;
> +
> +	regmap_update_bits(lpg->map, chan->base + PWM_TYPE_CONFIG_REG,
> +			   LPG_ENABLE_GLITCH_REMOVAL, 0);
> +}
> +
> +static void lpg_disable_glitch(struct lpg_channel *chan)
> +{
> +	struct lpg *lpg = chan->lpg;
> +
> +	regmap_update_bits(lpg->map, chan->base + PWM_TYPE_CONFIG_REG,
> +			   LPG_ENABLE_GLITCH_REMOVAL,
> +			   LPG_ENABLE_GLITCH_REMOVAL);
> +}
> +
> +static void lpg_apply_pwm_value(struct lpg_channel *chan)
> +{
> +	struct lpg *lpg = chan->lpg;
> +	u16 val = chan->pwm_value;
> +
> +	if (!chan->enabled)
> +		return;
> +
> +	regmap_bulk_write(lpg->map, chan->base + PWM_VALUE_REG, &val, 1);
> +}
> +
> +#define LPG_PATTERN_CONFIG_LO_TO_HI	BIT(4)
> +#define LPG_PATTERN_CONFIG_REPEAT	BIT(3)
> +#define LPG_PATTERN_CONFIG_TOGGLE	BIT(2)
> +#define LPG_PATTERN_CONFIG_PAUSE_HI	BIT(1)
> +#define LPG_PATTERN_CONFIG_PAUSE_LO	BIT(0)
> +
> +static void lpg_apply_lut_control(struct lpg_channel *chan)
> +{
> +	struct lpg *lpg = chan->lpg;
> +	unsigned int hi_pause;
> +	unsigned int lo_pause;
> +	unsigned int step;
> +	unsigned int conf = 0;
> +	unsigned int lo_idx = chan->pattern_lo_idx;
> +	unsigned int hi_idx = chan->pattern_hi_idx;
> +	int pattern_len;
> +
> +	if (!chan->ramp_enabled || chan->pattern_lo_idx == chan->pattern_hi_idx)
> +		return;
> +
> +	pattern_len = hi_idx - lo_idx + 1;
> +
> +	step = chan->ramp_tick_ms;
> +	hi_pause = DIV_ROUND_UP(chan->ramp_hi_pause_ms, step);
> +	lo_pause = DIV_ROUND_UP(chan->ramp_lo_pause_ms, step);
> +
> +	if (!chan->ramp_reverse)
> +		conf |= LPG_PATTERN_CONFIG_LO_TO_HI;
> +	if (!chan->ramp_oneshot)
> +		conf |= LPG_PATTERN_CONFIG_REPEAT;
> +	if (chan->ramp_ping_pong)
> +		conf |= LPG_PATTERN_CONFIG_TOGGLE;
> +	if (chan->ramp_hi_pause_ms)
> +		conf |= LPG_PATTERN_CONFIG_PAUSE_HI;
> +	if (chan->ramp_lo_pause_ms)
> +		conf |= LPG_PATTERN_CONFIG_PAUSE_LO;
> +
> +	regmap_write(lpg->map, chan->base + LPG_PATTERN_CONFIG_REG, conf);
> +	regmap_write(lpg->map, chan->base + LPG_HI_IDX_REG, hi_idx);
> +	regmap_write(lpg->map, chan->base + LPG_LO_IDX_REG, lo_idx);
> +
> +	regmap_write(lpg->map, chan->base + LPG_RAMP_DURATION_REG, step);
> +	regmap_write(lpg->map, chan->base + LPG_HI_PAUSE_REG, hi_pause);
> +	regmap_write(lpg->map, chan->base + LPG_LO_PAUSE_REG, lo_pause);
> +}
> +
> +#define LPG_ENABLE_CONTROL_OUTPUT		BIT(7)
> +#define LPG_ENABLE_CONTROL_BUFFER_TRISTATE	BIT(5)
> +#define LPG_ENABLE_CONTROL_SRC_PWM		BIT(2)
> +#define LPG_ENABLE_CONTROL_RAMP_GEN		BIT(1)
> +
> +static void lpg_apply_control(struct lpg_channel *chan)
> +{
> +	unsigned int ctrl;
> +	struct lpg *lpg = chan->lpg;
> +
> +	ctrl = LPG_ENABLE_CONTROL_BUFFER_TRISTATE;
> +
> +	if (chan->enabled)
> +		ctrl |= LPG_ENABLE_CONTROL_OUTPUT;
> +
> +	if (chan->pattern_lo_idx != chan->pattern_hi_idx)
> +		ctrl |= LPG_ENABLE_CONTROL_RAMP_GEN;
> +	else
> +		ctrl |= LPG_ENABLE_CONTROL_SRC_PWM;
> +
> +	regmap_write(lpg->map, chan->base + PWM_ENABLE_CONTROL_REG, ctrl);
> +
> +	/*
> +	 * Due to LPG hardware bug, in the PWM mode, having enabled PWM,
> +	 * We have to write PWM values one more time.
> +	 */
> +	if (chan->enabled)
> +		lpg_apply_pwm_value(chan);
> +}
> +
> +#define LPG_SYNC_PWM	BIT(0)
> +
> +static void lpg_apply_sync(struct lpg_channel *chan)
> +{
> +	struct lpg *lpg = chan->lpg;
> +
> +	regmap_write(lpg->map, chan->base + PWM_SYNC_REG, LPG_SYNC_PWM);
> +}
> +
> +static int lpg_parse_dtest(struct lpg *lpg)
> +{
> +	struct lpg_channel *chan;
> +	struct device_node *np = lpg->dev->of_node;
> +	int count;
> +	int ret;
> +	int i;
> +
> +	count = of_property_count_u32_elems(np, "qcom,dtest");
> +	if (count == -EINVAL) {
> +		return 0;
> +	} else if (count < 0) {
> +		ret = count;
> +		goto err_malformed;
> +	} else if (count != lpg->data->num_channels * 2) {
> +		dev_err(lpg->dev, "qcom,dtest needs to be %d items\n",
> +			lpg->data->num_channels * 2);
> +		return -EINVAL;
> +	}
> +
> +	for (i = 0; i < lpg->data->num_channels; i++) {
> +		chan = &lpg->channels[i];
> +
> +		ret = of_property_read_u32_index(np, "qcom,dtest", i * 2,
> +						 &chan->dtest_line);
> +		if (ret)
> +			goto err_malformed;
> +
> +		ret = of_property_read_u32_index(np, "qcom,dtest", i * 2 + 1,
> +						 &chan->dtest_value);
> +		if (ret)
> +			goto err_malformed;
> +	}
> +
> +	return 0;
> +
> +err_malformed:
> +	dev_err(lpg->dev, "malformed qcom,dtest\n");
> +	return ret;
> +}
> +
> +static void lpg_apply_dtest(struct lpg_channel *chan)
> +{
> +	struct lpg *lpg = chan->lpg;
> +
> +	if (!chan->dtest_line)
> +		return;
> +
> +	regmap_write(lpg->map, chan->base + PWM_SEC_ACCESS_REG, 0xa5);
> +	regmap_write(lpg->map, chan->base + PWM_DTEST_REG(chan->dtest_line),
> +		     chan->dtest_value);
> +}
> +
> +static void lpg_apply(struct lpg_channel *chan)
> +{
> +	lpg_disable_glitch(chan);
> +	lpg_apply_freq(chan);
> +	lpg_apply_pwm_value(chan);
> +	lpg_apply_control(chan);
> +	lpg_apply_sync(chan);
> +	lpg_apply_lut_control(chan);
> +	lpg_enable_glitch(chan);
> +}
> +
> +static void lpg_brightness_set(struct lpg_led *led, struct led_classdev *cdev,
> +			       struct mc_subled *subleds)
> +{
> +	enum led_brightness brightness;
> +	struct lpg_channel *chan;
> +	unsigned int triled_enabled = 0;
> +	unsigned int triled_mask = 0;
> +	unsigned int lut_mask = 0;
> +	unsigned int duty_us;
> +	struct lpg *lpg = led->lpg;
> +	int i;
> +
> +	for (i = 0; i < led->num_channels; i++) {
> +		chan = led->channels[i];
> +		brightness = subleds[i].brightness;
> +
> +		if (brightness == LED_OFF) {
> +			chan->enabled = false;
> +			chan->ramp_enabled = false;
> +		} else if (chan->pattern_lo_idx != chan->pattern_hi_idx) {
> +			lpg_calc_freq(chan, NSEC_PER_USEC);
> +
> +			chan->enabled = true;
> +			chan->ramp_enabled = true;
> +
> +			lut_mask |= chan->lut_mask;
> +			triled_enabled |= chan->triled_mask;
> +		} else {
> +			lpg_calc_freq(chan, NSEC_PER_USEC);
> +
> +			duty_us = brightness * chan->period_us / cdev->max_brightness;
> +			lpg_calc_duty(chan, duty_us);
> +			chan->enabled = true;
> +			chan->ramp_enabled = false;
> +
> +			triled_enabled |= chan->triled_mask;
> +		}
> +
> +		triled_mask |= chan->triled_mask;
> +
> +		lpg_apply(chan);
> +	}
> +
> +	/* Toggle triled lines */
> +	if (triled_mask)
> +		triled_set(lpg, triled_mask, triled_enabled);
> +
> +	/* Trigger start of ramp generator(s) */
> +	if (lut_mask)
> +		lpg_lut_sync(lpg, lut_mask);
> +}
> +
> +static void lpg_brightness_single_set(struct led_classdev *cdev,
> +				      enum led_brightness value)
> +{
> +	struct lpg_led *led = container_of(cdev, struct lpg_led, cdev);
> +	struct mc_subled info;
> +
> +	info.brightness = value;
> +	lpg_brightness_set(led, cdev, &info);
> +}
> +
> +static void lpg_brightness_mc_set(struct led_classdev *cdev,
> +				  enum led_brightness value)
> +{
> +	struct led_classdev_mc *mc = lcdev_to_mccdev(cdev);
> +	struct lpg_led *led = container_of(mc, struct lpg_led, mcdev);
> +
> +	led_mc_calc_color_components(mc, value);
> +	lpg_brightness_set(led, cdev, mc->subled_info);
> +}
> +
> +static int lpg_blink_set(struct lpg_led *led,
> +			 unsigned long *delay_on, unsigned long *delay_off)
> +{
> +	struct lpg_channel *chan;
> +	unsigned int period_us;
> +	unsigned int duty_us;
> +	int i;
> +
> +	if (!*delay_on && !*delay_off) {
> +		*delay_on = 500;
> +		*delay_off = 500;
> +	}
> +
> +	duty_us = *delay_on * USEC_PER_MSEC;
> +	period_us = (*delay_on + *delay_off) * USEC_PER_MSEC;
> +
> +	for (i = 0; i < led->num_channels; i++) {
> +		chan = led->channels[i];
> +
> +		lpg_calc_freq(chan, period_us);
> +		lpg_calc_duty(chan, duty_us);
> +
> +		chan->enabled = true;
> +		chan->ramp_enabled = false;
> +
> +		lpg_apply(chan);
> +	}
> +
> +	return 0;
> +}
> +
> +static int lpg_blink_single_set(struct led_classdev *cdev,
> +				unsigned long *delay_on, unsigned long *delay_off)
> +{
> +	struct lpg_led *led = container_of(cdev, struct lpg_led, cdev);
> +
> +	return lpg_blink_set(led, delay_on, delay_off);
> +}
> +
> +static int lpg_blink_mc_set(struct led_classdev *cdev,
> +			    unsigned long *delay_on, unsigned long *delay_off)
> +{
> +	struct led_classdev_mc *mc = lcdev_to_mccdev(cdev);
> +	struct lpg_led *led = container_of(mc, struct lpg_led, mcdev);
> +
> +	return lpg_blink_set(led, delay_on, delay_off);
> +}
> +
> +static int lpg_pattern_set(struct lpg_led *led, struct led_pattern *pattern,
> +			   u32 len, int repeat)
> +{
> +	struct lpg_channel *chan;
> +	struct lpg *lpg = led->lpg;
> +	unsigned int hi_pause;
> +	unsigned int lo_pause;
> +	unsigned int lo_idx;
> +	unsigned int hi_idx;
> +	bool ping_pong = true;
> +	int brightness_a;
> +	int brightness_b;
> +	int ret;
> +	int i;
> +
> +	/* Only support oneshot or indefinite loops, due to limited pattern space */
> +	if (repeat != -1 && repeat != 1)
> +		return -EINVAL;
> +
> +	/*
> +	 * The LPG plays patterns with at a fixed pace, a "low pause" can be
> +	 * performed before the pattern and a "high pause" after. In order to
> +	 * save space the pattern can be played in "ping pong" mode, in which
> +	 * the pattern is first played forward, then "high pause" is applied,
> +	 * then the pattern is played backwards and finally the "low pause" is
> +	 * applied.
> +	 *
> +	 * The delta_t of the first entry is used to determine the pace of the
> +	 * pattern.
> +	 *
> +	 * If the specified pattern is a palindrome the ping pong mode is
> +	 * enabled. In this scenario the delta_t of the last entry determines
> +	 * the "low pause" time and the delta_t of the middle entry (i.e. the
> +	 * last in the programmed pattern) determines the "high pause". If the
> +	 * pattern consists of an odd number of values, no "high pause" is
> +	 * used.
> +	 *
> +	 * When ping pong mode is not selected, the delta_t of the last entry
> +	 * is used as "high pause". No "low pause" is used.
> +	 *
> +	 * delta_t of any other members of the pattern is ignored.
> +	 */
> +
> +	/* Detect palindromes and use "ping pong" to reduce LUT usage */
> +	for (i = 0; i < len / 2; i++) {
> +		brightness_a = pattern[i].brightness;
> +		brightness_b = pattern[len - i - 1].brightness;
> +
> +		if (brightness_a != brightness_b) {
> +			ping_pong = false;
> +			break;
> +		}
> +	}
> +
> +	if (ping_pong) {
> +		if (len % 2)
> +			hi_pause = 0;
> +		else
> +			hi_pause = pattern[(len + 1) / 2].delta_t;
> +		lo_pause = pattern[len - 1].delta_t;
> +
> +		len = (len + 1) / 2;
> +	} else {
> +		hi_pause = pattern[len - 1].delta_t;
> +		lo_pause = 0;
> +	}
> +
> +	ret = lpg_lut_store(lpg, pattern, len, &lo_idx, &hi_idx);
> +	if (ret < 0)
> +		return ret;
> +
> +	for (i = 0; i < led->num_channels; i++) {
> +		chan = led->channels[i];
> +
> +		chan->ramp_tick_ms = pattern[0].delta_t;
> +		chan->ramp_ping_pong = ping_pong;
> +		chan->ramp_oneshot = repeat != -1;
> +
> +		chan->ramp_lo_pause_ms = lo_pause;
> +		chan->ramp_hi_pause_ms = hi_pause;
> +
> +		chan->pattern_lo_idx = lo_idx;
> +		chan->pattern_hi_idx = hi_idx;
> +	}
> +
> +	return 0;
> +}
> +
> +static int lpg_pattern_single_set(struct led_classdev *cdev,
> +				  struct led_pattern *pattern, u32 len,
> +				  int repeat)
> +{
> +	struct lpg_led *led = container_of(cdev, struct lpg_led, cdev);
> +	int ret;
> +
> +	ret = lpg_pattern_set(led, pattern, len, repeat);
> +	if (ret < 0)
> +		return ret;
> +
> +	lpg_brightness_single_set(cdev, LED_FULL);
> +
> +	return 0;
> +}
> +
> +static int lpg_pattern_mc_set(struct led_classdev *cdev,
> +			      struct led_pattern *pattern, u32 len,
> +			      int repeat)
> +{
> +	struct led_classdev_mc *mc = lcdev_to_mccdev(cdev);
> +	struct lpg_led *led = container_of(mc, struct lpg_led, mcdev);
> +	int ret;
> +
> +	ret = lpg_pattern_set(led, pattern, len, repeat);
> +	if (ret < 0)
> +		return ret;
> +
> +	led_mc_calc_color_components(mc, LED_FULL);
> +	lpg_brightness_set(led, cdev, mc->subled_info);
> +
> +	return 0;
> +}
> +
> +static int lpg_pattern_clear(struct lpg_led *led)
> +{
> +	struct lpg_channel *chan;
> +	struct lpg *lpg = led->lpg;
> +	int i;
> +
> +	chan = led->channels[0];
> +	lpg_lut_free(lpg, chan->pattern_lo_idx, chan->pattern_hi_idx);
> +
> +	for (i = 0; i < led->num_channels; i++) {
> +		chan = led->channels[i];
> +		chan->pattern_lo_idx = 0;
> +		chan->pattern_hi_idx = 0;
> +	}
> +
> +	return 0;
> +}
> +
> +static int lpg_pattern_single_clear(struct led_classdev *cdev)
> +{
> +	struct lpg_led *led = container_of(cdev, struct lpg_led, cdev);
> +
> +	return lpg_pattern_clear(led);
> +}
> +
> +static int lpg_pattern_mc_clear(struct led_classdev *cdev)
> +{
> +	struct led_classdev_mc *mc = lcdev_to_mccdev(cdev);
> +	struct lpg_led *led = container_of(mc, struct lpg_led, mcdev);
> +
> +	return lpg_pattern_clear(led);
> +}
> +
> +static int lpg_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
> +{
> +	struct lpg *lpg = container_of(chip, struct lpg, pwm);
> +	struct lpg_channel *chan = &lpg->channels[pwm->hwpwm];
> +
> +	return chan->in_use ? -EBUSY : 0;
> +}
> +
> +static int lpg_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
> +			 const struct pwm_state *state)
> +{
> +	struct lpg *lpg = container_of(chip, struct lpg, pwm);
> +	struct lpg_channel *chan = &lpg->channels[pwm->hwpwm];
> +
> +	lpg_calc_freq(chan, div_u64(state->period, NSEC_PER_USEC));
> +	lpg_calc_duty(chan, div_u64(state->duty_cycle, NSEC_PER_USEC));
> +	chan->enabled = state->enabled;
> +
> +	lpg_apply(chan);
> +
> +	triled_set(lpg, chan->triled_mask, chan->enabled ? chan->triled_mask : 0);
> +
> +	return 0;
> +}
> +
> +static const struct pwm_ops lpg_pwm_ops = {
> +	.request = lpg_pwm_request,
> +	.apply = lpg_pwm_apply,
> +	.owner = THIS_MODULE,
> +};
> +
> +static int lpg_add_pwm(struct lpg *lpg)
> +{
> +	int ret;
> +
> +	lpg->pwm.base = -1;
> +	lpg->pwm.dev = lpg->dev;
> +	lpg->pwm.npwm = lpg->num_channels;
> +	lpg->pwm.ops = &lpg_pwm_ops;
> +
> +	ret = pwmchip_add(&lpg->pwm);
> +	if (ret)
> +		dev_err(lpg->dev, "failed to add PWM chip: ret %d\n", ret);
> +
> +	return ret;
> +}
> +
> +static int lpg_parse_channel(struct lpg *lpg, struct device_node *np,
> +			     struct lpg_channel **channel)
> +{
> +	struct lpg_channel *chan;
> +	u32 color = LED_COLOR_ID_GREEN;
> +	u32 reg;
> +	int ret;
> +
> +	ret = of_property_read_u32(np, "reg", &reg);
> +	if (ret || !reg || reg > lpg->num_channels) {
> +		dev_err(lpg->dev, "invalid reg of %pOFn\n", np);
> +		return -EINVAL;
> +	}
> +
> +	chan = &lpg->channels[reg - 1];
> +	chan->in_use = true;
> +
> +	ret = of_property_read_u32(np, "color", &color);
> +	if (ret < 0 && ret != -EINVAL) {
> +		dev_err(lpg->dev, "failed to parse \"color\" of %pOF\n", np);
> +		return ret;
> +	}
> +
> +	chan->color = color;
> +
> +	*channel = chan;
> +
> +	return 0;
> +}
> +
> +static int lpg_add_led(struct lpg *lpg, struct device_node *np)
> +{
> +	struct led_classdev *cdev;
> +	struct device_node *child;
> +	struct mc_subled *info;
> +	struct lpg_led *led;
> +	const char *state;
> +	int num_channels;
> +	u32 color = 0;
> +	int ret;
> +	int i;
> +
> +	ret = of_property_read_u32(np, "color", &color);
> +	if (ret < 0 && ret != -EINVAL) {
> +		dev_err(lpg->dev, "failed to parse \"color\" of %pOF\n", np);
> +		return ret;
> +	}
> +
> +	if (color == LED_COLOR_ID_MULTI)
> +		num_channels = of_get_available_child_count(np);
> +	else
> +		num_channels = 1;
> +
> +	led = devm_kzalloc(lpg->dev, struct_size(led, channels, num_channels), GFP_KERNEL);
> +	if (!led)
> +		return -ENOMEM;
> +
> +	led->lpg = lpg;
> +	led->num_channels = num_channels;
> +
> +	if (color == LED_COLOR_ID_MULTI) {
> +		info = devm_kcalloc(lpg->dev, num_channels, sizeof(*info), GFP_KERNEL);
> +		if (!info)
> +			return -ENOMEM;
> +		i = 0;
> +		for_each_available_child_of_node(np, child) {
> +			ret = lpg_parse_channel(lpg, child, &led->channels[i]);
> +			if (ret < 0)
> +				return ret;
> +
> +			info[i].color_index = led->channels[i]->color;
> +			info[i].intensity = LED_FULL;
> +			i++;
> +		}
> +
> +		led->mcdev.subled_info = info;
> +		led->mcdev.num_colors = num_channels;
> +
> +		cdev = &led->mcdev.led_cdev;
> +		cdev->brightness_set = lpg_brightness_mc_set;
> +		cdev->blink_set = lpg_blink_mc_set;
> +
> +		/* Register pattern accessors only if we have a LUT block */
> +		if (lpg->lut_base) {
> +			cdev->pattern_set = lpg_pattern_mc_set;
> +			cdev->pattern_clear = lpg_pattern_mc_clear;
> +		}
> +	} else {
> +		ret = lpg_parse_channel(lpg, np, &led->channels[0]);
> +		if (ret < 0)
> +			return ret;
> +
> +		cdev = &led->cdev;
> +		cdev->brightness_set = lpg_brightness_single_set;
> +		cdev->blink_set = lpg_blink_single_set;
> +
> +		/* Register pattern accessors only if we have a LUT block */
> +		if (lpg->lut_base) {
> +			cdev->pattern_set = lpg_pattern_single_set;
> +			cdev->pattern_clear = lpg_pattern_single_clear;
> +		}
> +	}
> +
> +	/* Use label else node name */
> +	cdev->name = of_get_property(np, "label", NULL) ? : np->name;
> +	cdev->default_trigger = of_get_property(np, "linux,default-trigger", NULL);
> +	cdev->max_brightness = 255;
> +
> +	if (!of_property_read_string(np, "default-state", &state) &&
> +	    !strcmp(state, "on"))
> +		cdev->brightness = LED_FULL;
> +	else
> +		cdev->brightness = LED_OFF;
> +
> +	cdev->brightness_set(cdev, cdev->brightness);
> +
> +	if (color == LED_COLOR_ID_MULTI)
> +		ret = devm_led_classdev_multicolor_register(lpg->dev, &led->mcdev);
> +	else
> +		ret = devm_led_classdev_register(lpg->dev, &led->cdev);
> +	if (ret)
> +		dev_err(lpg->dev, "unable to register %s\n", cdev->name);
> +
> +	return ret;
> +}
> +
> +static int lpg_init_channels(struct lpg *lpg)
> +{
> +	const struct lpg_data *data = lpg->data;
> +	int i;
> +
> +	lpg->num_channels = data->num_channels;
> +	lpg->channels = devm_kcalloc(lpg->dev, data->num_channels,
> +				     sizeof(struct lpg_channel), GFP_KERNEL);
> +	if (!lpg->channels)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < data->num_channels; i++) {
> +		lpg->channels[i].lpg = lpg;
> +		lpg->channels[i].base = data->channels[i].base;
> +		lpg->channels[i].triled_mask = data->channels[i].triled_mask;
> +		lpg->channels[i].lut_mask = BIT(i);
> +	}
> +
> +	return 0;
> +}
> +
> +static int lpg_init_triled(struct lpg *lpg)
> +{
> +	struct device_node *np = lpg->dev->of_node;
> +	int ret;
> +
> +	/* Skip initialization if we don't have a triled block */
> +	if (!lpg->data->triled_base)
> +		return 0;
> +
> +	lpg->triled_base = lpg->data->triled_base;
> +	lpg->triled_has_atc_ctl = lpg->data->triled_has_atc_ctl;
> +	lpg->triled_has_src_sel = lpg->data->triled_has_src_sel;
> +
> +	if (lpg->triled_has_src_sel) {
> +		ret = of_property_read_u32(np, "qcom,power-source", &lpg->triled_src);
> +		if (ret || lpg->triled_src == 2 || lpg->triled_src > 3) {
> +			dev_err(lpg->dev, "invalid power source\n");
> +			return -EINVAL;
> +		}
> +	}
> +
> +	/* Disable automatic trickle charge LED */
> +	if (lpg->triled_has_atc_ctl)
> +		regmap_write(lpg->map, lpg->triled_base + TRI_LED_ATC_CTL, 0);
> +
> +	/* Configure power source */
> +	if (lpg->triled_has_src_sel)
> +		regmap_write(lpg->map, lpg->triled_base + TRI_LED_SRC_SEL, lpg->triled_src);
> +
> +	/* Default all outputs to off */
> +	regmap_write(lpg->map, lpg->triled_base + TRI_LED_EN_CTL, 0);
> +
> +	return 0;
> +}
> +
> +static int lpg_init_lut(struct lpg *lpg)
> +{
> +	const struct lpg_data *data = lpg->data;
> +	size_t bitmap_size;
> +
> +	if (!data->lut_base)
> +		return 0;
> +
> +	lpg->lut_base = data->lut_base;
> +	lpg->lut_size = data->lut_size;
> +
> +	bitmap_size = BITS_TO_BYTES(lpg->lut_size);
> +	lpg->lut_bitmap = devm_kzalloc(lpg->dev, bitmap_size, GFP_KERNEL);
> +	if (!lpg->lut_bitmap)
> +		return -ENOMEM;
> +
> +	bitmap_clear(lpg->lut_bitmap, 0, lpg->lut_size);
> +
> +	return 0;
> +}
> +
> +static int lpg_probe(struct platform_device *pdev)
> +{
> +	struct device_node *np;
> +	struct lpg *lpg;
> +	int ret;
> +	int i;
> +
> +	lpg = devm_kzalloc(&pdev->dev, sizeof(*lpg), GFP_KERNEL);
> +	if (!lpg)
> +		return -ENOMEM;
> +
> +	lpg->data = of_device_get_match_data(&pdev->dev);
> +	if (!lpg->data)
> +		return -EINVAL;
> +
> +	lpg->dev = &pdev->dev;
> +
> +	lpg->map = dev_get_regmap(pdev->dev.parent, NULL);
> +	if (!lpg->map) {
> +		dev_err(&pdev->dev, "parent regmap unavailable\n");
> +		return -ENXIO;
> +	}
> +
> +	ret = lpg_init_channels(lpg);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = lpg_parse_dtest(lpg);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = lpg_init_triled(lpg);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = lpg_init_lut(lpg);
> +	if (ret < 0)
> +		return ret;
> +
> +	for_each_available_child_of_node(pdev->dev.of_node, np) {
> +		ret = lpg_add_led(lpg, np);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	for (i = 0; i < lpg->num_channels; i++)
> +		lpg_apply_dtest(&lpg->channels[i]);
> +
> +	ret = lpg_add_pwm(lpg);
> +	if (ret)
> +		return ret;
> +
> +	platform_set_drvdata(pdev, lpg);
> +
> +	return 0;
> +}
> +
> +static int lpg_remove(struct platform_device *pdev)
> +{
> +	struct lpg *lpg = platform_get_drvdata(pdev);
> +
> +	pwmchip_remove(&lpg->pwm);
> +
> +	return 0;
> +}
> +
> +static const struct lpg_data pm8916_pwm_data = {
> +	.pwm_9bit_mask = BIT(2),
> +
> +	.num_channels = 1,
> +	.channels = (struct lpg_channel_data[]) {
> +		{ .base = 0xbc00 },
> +	},
> +};
> +
> +static const struct lpg_data pm8941_lpg_data = {
> +	.lut_base = 0xb000,
> +	.lut_size = 64,
> +
> +	.triled_base = 0xd000,
> +	.triled_has_atc_ctl = true,
> +	.triled_has_src_sel = true,
> +
> +	.pwm_9bit_mask = 3 << 4,
> +
> +	.num_channels = 8,
> +	.channels = (struct lpg_channel_data[]) {
> +		{ .base = 0xb100 },
> +		{ .base = 0xb200 },
> +		{ .base = 0xb300 },
> +		{ .base = 0xb400 },
> +		{ .base = 0xb500, .triled_mask = BIT(5) },
> +		{ .base = 0xb600, .triled_mask = BIT(6) },
> +		{ .base = 0xb700, .triled_mask = BIT(7) },
> +		{ .base = 0xb800 },
> +	},
> +};
> +
> +static const struct lpg_data pm8994_lpg_data = {
> +	.lut_base = 0xb000,
> +	.lut_size = 64,
> +
> +	.pwm_9bit_mask = 3 << 4,
> +
> +	.num_channels = 6,
> +	.channels = (struct lpg_channel_data[]) {
> +		{ .base = 0xb100 },
> +		{ .base = 0xb200 },
> +		{ .base = 0xb300 },
> +		{ .base = 0xb400 },
> +		{ .base = 0xb500 },
> +		{ .base = 0xb600 },
> +	},
> +};
> +
> +static const struct lpg_data pmi8994_lpg_data = {
> +	.lut_base = 0xb000,
> +	.lut_size = 24,
> +
> +	.triled_base = 0xd000,
> +	.triled_has_atc_ctl = true,
> +	.triled_has_src_sel = true,
> +
> +	.pwm_9bit_mask = BIT(4),
> +
> +	.num_channels = 4,
> +	.channels = (struct lpg_channel_data[]) {
> +		{ .base = 0xb100, .triled_mask = BIT(5) },
> +		{ .base = 0xb200, .triled_mask = BIT(6) },
> +		{ .base = 0xb300, .triled_mask = BIT(7) },
> +		{ .base = 0xb400 },
> +	},
> +};
> +
> +static const struct lpg_data pmi8998_lpg_data = {
> +	.lut_base = 0xb000,
> +	.lut_size = 49,
> +
> +	.triled_base = 0xd000,
> +
> +	.pwm_9bit_mask = BIT(4),
> +
> +	.num_channels = 6,
> +	.channels = (struct lpg_channel_data[]) {
> +		{ .base = 0xb100 },
> +		{ .base = 0xb200 },
> +		{ .base = 0xb300, .triled_mask = BIT(5) },
> +		{ .base = 0xb400, .triled_mask = BIT(6) },
> +		{ .base = 0xb500, .triled_mask = BIT(7) },
> +		{ .base = 0xb600 },
> +	},
> +};
> +
> +static const struct lpg_data pm8150b_lpg_data = {
> +	.lut_base = 0xb000,
> +	.lut_size = 49,
> +
> +	.triled_base = 0xd000,


For the LED peripheral under PM8150B we've some quirks. If one of the channels is enabled, then we need to do an additional SDAM register write to trigger a PBS (programmable boot sequence).

This is required to set the headroom voltage of BOB peripheral that is on PM8150L PMIC. When both the LED channels are disabled, a similar register write has to be made

again to trigger the PBS again to unvote the headroom voltage request made before.


> +
> +	.pwm_9bit_mask = BIT(4),
> +
> +	.num_channels = 2,
> +	.channels = (struct lpg_channel_data[]) {
> +		{ .base = 0xb100, .triled_mask = BIT(7) },
> +		{ .base = 0xb200, .triled_mask = BIT(6) },
> +	},
> +};
> +
> +static const struct lpg_data pm8150l_lpg_data = {
> +	.lut_base = 0xb000,
> +	.lut_size = 49,
> +
> +	.triled_base = 0xd000,
> +
> +	.pwm_9bit_mask = BIT(4),
> +
> +	.num_channels = 5,


Not a big concern but I'm wondering how to represent 2 different blocks of HW from a PMIC here. First one is a LPG peripheral with 3 channels starting from 0xb100 which is consumed for TRI_LED.

Second one is a PWM peripheral with 2 channel starting from 0xbc00 which can never use LUT specified above. Looks like here you want to represent them as a whole. But in the case, if

an user wants to use the PWM channel (not a LPG channel) along with LUT, it shouldn't be supported. Can this be enforced by allowing LUT to be configured only for a peripheral of subtype LPG?


> +	.channels = (struct lpg_channel_data[]) {
> +		{ .base = 0xb100, .triled_mask = BIT(7) },
> +		{ .base = 0xb200, .triled_mask = BIT(6) },
> +		{ .base = 0xb300, .triled_mask = BIT(5) },
> +		{ .base = 0xbc00 },
> +		{ .base = 0xbd00 },
> +
> +	},
> +};
> +
> +static const struct of_device_id lpg_of_table[] = {
> +	{ .compatible = "qcom,pm8150b-lpg", .data = &pm8150b_lpg_data },
> +	{ .compatible = "qcom,pm8150l-lpg", .data = &pm8150l_lpg_data },
> +	{ .compatible = "qcom,pm8916-pwm", .data = &pm8916_pwm_data },
> +	{ .compatible = "qcom,pm8941-lpg", .data = &pm8941_lpg_data },
> +	{ .compatible = "qcom,pm8994-lpg", .data = &pm8994_lpg_data },
> +	{ .compatible = "qcom,pmi8994-lpg", .data = &pmi8994_lpg_data },
> +	{ .compatible = "qcom,pmi8998-lpg", .data = &pmi8998_lpg_data },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(of, lpg_of_table);
> +
> +static struct platform_driver lpg_driver = {
> +	.probe = lpg_probe,
> +	.remove = lpg_remove,
> +	.driver = {
> +		.name = "qcom-spmi-lpg",
> +		.of_match_table = lpg_of_table,
> +	},
> +};
> +module_platform_driver(lpg_driver);
> +
> +MODULE_DESCRIPTION("Qualcomm LPG LED driver");
> +MODULE_LICENSE("GPL v2");


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

[PATCH v7 3/6] arm64: dts: qcom: Add LPG to pm8916, pm8994, pmi8994 and pmi8998

[Bjorn Andersson]

Add PWM/LPG nodes to the PMICs currently supported by the binding.

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

Changes since v6:
- Extended patch to cover all the supported (arm64) PMICs

 arch/arm64/boot/dts/qcom/pm8916.dtsi  |  8 ++++++++
 arch/arm64/boot/dts/qcom/pm8994.dtsi  | 10 ++++++++++
 arch/arm64/boot/dts/qcom/pmi8994.dtsi | 10 ++++++++++
 arch/arm64/boot/dts/qcom/pmi8998.dtsi | 10 ++++++++++
 4 files changed, 38 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/pm8916.dtsi b/arch/arm64/boot/dts/qcom/pm8916.dtsi
index f931cb0de231..db973e4ef9d3 100644
--- a/arch/arm64/boot/dts/qcom/pm8916.dtsi
+++ b/arch/arm64/boot/dts/qcom/pm8916.dtsi
@@ -119,6 +119,14 @@ pm8916_1: pmic@1 {
 		#address-cells = <1>;
 		#size-cells = <0>;
 
+		pm8916_pwm: pwm {
+			compatible = "qcom,pm8916-pwm";
+
+			#pwm-cells = <2>;
+
+			status = "disabled";
+		};
+
 		pm8916_vib: vibrator@c000 {
 			compatible = "qcom,pm8916-vib";
 			reg = <0xc000>;
diff --git a/arch/arm64/boot/dts/qcom/pm8994.dtsi b/arch/arm64/boot/dts/qcom/pm8994.dtsi
index c3876c82c874..9386cf12867d 100644
--- a/arch/arm64/boot/dts/qcom/pm8994.dtsi
+++ b/arch/arm64/boot/dts/qcom/pm8994.dtsi
@@ -134,6 +134,16 @@ pmic@1 {
 		#address-cells = <1>;
 		#size-cells = <0>;
 
+		pm8994_lpg: lpg {
+			compatible = "qcom,pm8994-lpg";
+
+			#address-cells = <1>;
+			#size-cells = <0>;
+			#pwm-cells = <2>;
+
+			status = "disabled";
+		};
+
 		pm8994_spmi_regulators: regulators {
 			compatible = "qcom,pm8994-regulators";
 		};
diff --git a/arch/arm64/boot/dts/qcom/pmi8994.dtsi b/arch/arm64/boot/dts/qcom/pmi8994.dtsi
index e5ed28ab9b2d..b118e87ef59e 100644
--- a/arch/arm64/boot/dts/qcom/pmi8994.dtsi
+++ b/arch/arm64/boot/dts/qcom/pmi8994.dtsi
@@ -27,6 +27,16 @@ pmic@3 {
 		#address-cells = <1>;
 		#size-cells = <0>;
 
+		pmi8994_lpg: lpg {
+			compatible = "qcom,pmi8994-lpg";
+
+			#address-cells = <1>;
+			#size-cells = <0>;
+			#pwm-cells = <2>;
+
+			status = "disabled";
+		};
+
 		pmi8994_spmi_regulators: regulators {
 			compatible = "qcom,pmi8994-regulators";
 			#address-cells = <1>;
diff --git a/arch/arm64/boot/dts/qcom/pmi8998.dtsi b/arch/arm64/boot/dts/qcom/pmi8998.dtsi
index d230c510d4b7..a600c25d6667 100644
--- a/arch/arm64/boot/dts/qcom/pmi8998.dtsi
+++ b/arch/arm64/boot/dts/qcom/pmi8998.dtsi
@@ -41,5 +41,15 @@ lab: lab {
 				interrupt-names = "sc-err", "ocp";
 			};
 		};
+
+		pmi8998_lpg: lpg {
+			compatible = "qcom,pmi8998-lpg";
+
+			#address-cells = <1>;
+			#size-cells = <0>;
+			#pwm-cells = <2>;
+
+			status = "disabled";
+		};
 	};
 };
-- 
2.29.2

[PATCH v7 4/6] arm64: dts: qcom: sdm845: Enable user LEDs on DB845c

[Bjorn Andersson]

The DB845c has 4 "user LEDs", the last one is already supported as it's
just wired to a gpio. Now that the LPG binding is in place we can wire
up the other 3 LEDs as well.

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

Changes since v6:
- New patch

 arch/arm64/boot/dts/qcom/sdm845-db845c.dts | 24 ++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sdm845-db845c.dts b/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
index 2d5533dd4ec2..e00a8dca2c64 100644
--- a/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
+++ b/arch/arm64/boot/dts/qcom/sdm845-db845c.dts
@@ -593,6 +593,30 @@ resin {
 	};
 };
 
+&pmi8998_lpg {
+	status = "okay";
+
+	qcom,power-source = <1>;
+
+	led@3 {
+		reg = <3>;
+		label = "green:user3";
+
+		linux,default-trigger = "heartbeat";
+		default-state = "on";
+	};
+
+	led@4 {
+		reg = <4>;
+		label = "green:user2";
+	};
+
+	led@5 {
+		reg = <5>;
+		label = "green:user1";
+	};
+};
+
 /* QUAT I2S Uses 4 I2S SD Lines for audio on LT9611 HDMI Bridge */
 &q6afedai {
 	qi2s@22 {
-- 
2.29.2

[PATCH v7 5/6] arm64: dts: qcom: pmi8994: Define MPP block

[Bjorn Andersson]

The pmi8994 has 4 multi-purpose-pins, add these to the definition.

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

Changes since v6:
- Split from the previous patch that adds LPG/PWM nodes

 arch/arm64/boot/dts/qcom/pmi8994.dtsi | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/pmi8994.dtsi b/arch/arm64/boot/dts/qcom/pmi8994.dtsi
index b118e87ef59e..b60934ec4a9a 100644
--- a/arch/arm64/boot/dts/qcom/pmi8994.dtsi
+++ b/arch/arm64/boot/dts/qcom/pmi8994.dtsi
@@ -19,6 +19,18 @@ pmi8994_gpios: gpios@c000 {
 			interrupt-controller;
 			#interrupt-cells = <2>;
 		};
+
+		pmi8994_mpps: mpps@a000 {
+			compatible = "qcom,pmi8994-mpp";
+			reg = <0xa000>;
+			gpio-controller;
+			gpio-ranges = <&pmi8994_mpps 0 0 4>;
+			#gpio-cells = <2>;
+			interrupts = <0 0xa0 0 IRQ_TYPE_NONE>,
+				     <0 0xa1 0 IRQ_TYPE_NONE>,
+				     <0 0xa2 0 IRQ_TYPE_NONE>,
+				     <0 0xa3 0 IRQ_TYPE_NONE>;
+		};
 	};
 
 	pmic@3 {
-- 
2.29.2

[PATCH v7 6/6] arm64: dts: qcom: db820c: Add user LEDs

[Bjorn Andersson]

The db820c has 4 "user LEDs", all connected to the PMI8994. The first
three are connected to the three current sinks provided by the TRILED
and the fourth is connected to MPP2.

By utilizing the DTEST bus the MPP is fed the control signal from the
fourth LPG block, providing a consistent interface to the user.

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

Changes since v6:
- Changed sort order

 arch/arm64/boot/dts/qcom/apq8096-db820c.dtsi | 49 ++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/apq8096-db820c.dtsi b/arch/arm64/boot/dts/qcom/apq8096-db820c.dtsi
index defcbd15edf9..2b90ceb84f84 100644
--- a/arch/arm64/boot/dts/qcom/apq8096-db820c.dtsi
+++ b/arch/arm64/boot/dts/qcom/apq8096-db820c.dtsi
@@ -8,6 +8,7 @@
 #include "pmi8994.dtsi"
 #include <dt-bindings/input/input.h>
 #include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/leds/common.h>
 #include <dt-bindings/pinctrl/qcom,pmic-gpio.h>
 #include <dt-bindings/sound/qcom,q6afe.h>
 #include <dt-bindings/sound/qcom,q6asm.h>
@@ -682,6 +683,54 @@ pinconf {
 	};
 };
 
+&pmi8994_lpg {
+	qcom,power-source = <1>;
+
+	pinctrl-names = "default";
+	pinctrl-0 = <&pmi8994_mpp2_userled4>;
+
+	qcom,dtest = <0 0
+		      0 0
+		      0 0
+		      4 1>;
+
+	status = "okay";
+
+	led@1 {
+		reg = <1>;
+		label = "green:user1";
+
+		linux,default-trigger = "heartbeat";
+		default-state = "on";
+	};
+
+	led@2 {
+		reg = <2>;
+		label = "green:user0";
+		default-state = "on";
+	};
+
+	led@3 {
+		reg = <3>;
+		label = "green:user2";
+	};
+
+	led@4 {
+		reg = <4>;
+		label = "green:user3";
+	};
+};
+
+&pmi8994_mpps {
+	pmi8994_mpp2_userled4: mpp2-userled4-state {
+		pins = "mpp2";
+		function = "sink";
+
+		output-low;
+		qcom,dtest = <4>;
+	};
+};
+
 &pmi8994_spmi_regulators {
 	vdd_gfx: s2@1700 {
 		reg = <0x1700 0x100>;
-- 
2.29.2