[PATCH v5 00/21] Ingenic JZ47xx TCU patchset v5

[PATCH v5 00/21] Ingenic JZ47xx TCU patchset v5

[Paul Cercueil]

Hi,

This is the V5 of my patchset that adds support to the Timer/Counter
Unit (TCU) present on Ingenic JZ47xx SoCs.

Way too much has changed since V4, we went from 8 patches in V4 up to
21 patches in V5.
I did not know if I had to submit it as V5 or start a new series.
In doubt, I sent a V5.

Very succint description of the changes:

- The interrupt, clocks, clocksource drivers have been merged into one;
  ingenic-timer now inits the TCU clocks, handles the interrupts,
  provides a system timer and optionally also a clocksource and
  sched_clock. The TCU channel #0 will be used as system timer, unless
  another channel is specified from devicetree.

- The simple-mfd and syscon are gone. The ingenic-timer driver will
  probe the drivers registered as children in the devicetree.

- The watchdog driver was updated to use the WDT clock and regmap
  provided by ingenic-timer. This breaks the devicetree ABI, but as
  explained in the corresponding commit message, right now all Ingenic
  boards compile the devicetree into the kernel anyway - so it's better
  to update it now before it's too late.

- The PWM driver was updated to use the TCU timer clocks as well as the
  regmap provided by ingenic-timer. Unused devicetree compatible strings
  were removed (the driver was never probed from devicetree), and
  support for the JZ4725B has been added.

- A new ingenic-ost driver was added, which provides a clocksource and
  a sched_clock that are more accurate than the ones provided by
  ingenic-timer (32 or 64-bit vs. 16-bit). It is not available on every
  SoC.

- Mostly tested on the JZ4725B and JZ4770. It would be great if somebody
  could test on the JZ4780 and JZ4740.

Thanks,
-Paul

[PATCH v5 01/21] mfd: Add ingenic-tcu.h header

[Paul Cercueil]

This header contains macros for the registers that are present in the
regmap shared by all the drivers related to the TCU (Timer Counter Unit)
of the Ingenic JZ47xx SoCs.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Acked-by: Lee Jones <lee.jones@linaro.org>
---
 include/linux/mfd/ingenic-tcu.h | 56 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 include/linux/mfd/ingenic-tcu.h

 v2: Use SPDX identifier for the license

 v3: - Use macros instead of enum
     - Add 'TCU_' at the beginning of each macro
	 - Remove useless include <linux/regmap.h>

 v4: No change

 v5: No change

diff --git a/include/linux/mfd/ingenic-tcu.h b/include/linux/mfd/ingenic-tcu.h
new file mode 100644
index 000000000000..3d85f075d2db
--- /dev/null
+++ b/include/linux/mfd/ingenic-tcu.h
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Header file for the Ingenic JZ47xx TCU driver
+ */
+#ifndef __LINUX_CLK_INGENIC_TCU_H_
+#define __LINUX_CLK_INGENIC_TCU_H_
+
+#include <linux/bitops.h>
+
+#define TCU_REG_WDT_TDR		0x00
+#define TCU_REG_WDT_TCER	0x04
+#define TCU_REG_WDT_TCNT	0x08
+#define TCU_REG_WDT_TCSR	0x0c
+#define TCU_REG_TER		0x10
+#define TCU_REG_TESR		0x14
+#define TCU_REG_TECR		0x18
+#define TCU_REG_TSR		0x1c
+#define TCU_REG_TFR		0x20
+#define TCU_REG_TFSR		0x24
+#define TCU_REG_TFCR		0x28
+#define TCU_REG_TSSR		0x2c
+#define TCU_REG_TMR		0x30
+#define TCU_REG_TMSR		0x34
+#define TCU_REG_TMCR		0x38
+#define TCU_REG_TSCR		0x3c
+#define TCU_REG_TDFR0		0x40
+#define TCU_REG_TDHR0		0x44
+#define TCU_REG_TCNT0		0x48
+#define TCU_REG_TCSR0		0x4c
+#define TCU_REG_OST_DR		0xe0
+#define TCU_REG_OST_CNTL	0xe4
+#define TCU_REG_OST_CNTH	0xe8
+#define TCU_REG_OST_TCSR	0xec
+#define TCU_REG_TSTR		0xf0
+#define TCU_REG_TSTSR		0xf4
+#define TCU_REG_TSTCR		0xf8
+#define TCU_REG_OST_CNTHBUF	0xfc
+
+#define TCU_TCSR_RESERVED_BITS		0x3f
+#define TCU_TCSR_PARENT_CLOCK_MASK	0x07
+#define TCU_TCSR_PRESCALE_LSB		3
+#define TCU_TCSR_PRESCALE_MASK		0x38
+
+#define TCU_TCSR_PWM_SD		BIT(9)	/* 0: Shutdown abruptly 1: gracefully */
+#define TCU_TCSR_PWM_INITL_HIGH	BIT(8)	/* Sets the initial output level */
+#define TCU_TCSR_PWM_EN		BIT(7)	/* PWM pin output enable */
+
+#define TCU_WDT_TCER_TCEN	BIT(0)	/* Watchdog timer enable */
+
+#define TCU_CHANNEL_STRIDE	0x10
+#define TCU_REG_TDFRc(c)	(TCU_REG_TDFR0 + ((c) * TCU_CHANNEL_STRIDE))
+#define TCU_REG_TDHRc(c)	(TCU_REG_TDHR0 + ((c) * TCU_CHANNEL_STRIDE))
+#define TCU_REG_TCNTc(c)	(TCU_REG_TCNT0 + ((c) * TCU_CHANNEL_STRIDE))
+#define TCU_REG_TCSRc(c)	(TCU_REG_TCSR0 + ((c) * TCU_CHANNEL_STRIDE))
+
+#endif /* __LINUX_CLK_INGENIC_TCU_H_ */
-- 
2.11.0

[PATCH v5 02/21] dt-bindings: ingenic: Add DT bindings for TCU clocks

[Paul Cercueil]

This header provides clock numbers for the ingenic,tcu
DT binding.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Reviewed-by: Rob Herring <robh@kernel.org>
---
 include/dt-bindings/clock/ingenic,tcu.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 include/dt-bindings/clock/ingenic,tcu.h

 v2: Use SPDX identifier for the license

 v3: No change

 v4: No change

 v5: s/JZ47*_/TCU_/ and dropped *_CLK_LAST defines

diff --git a/include/dt-bindings/clock/ingenic,tcu.h b/include/dt-bindings/clock/ingenic,tcu.h
new file mode 100644
index 000000000000..d569650a7945
--- /dev/null
+++ b/include/dt-bindings/clock/ingenic,tcu.h
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * This header provides clock numbers for the ingenic,tcu DT binding.
+ */
+
+#ifndef __DT_BINDINGS_CLOCK_INGENIC_TCU_H__
+#define __DT_BINDINGS_CLOCK_INGENIC_TCU_H__
+
+#define TCU_CLK_TIMER0	0
+#define TCU_CLK_TIMER1	1
+#define TCU_CLK_TIMER2	2
+#define TCU_CLK_TIMER3	3
+#define TCU_CLK_TIMER4	4
+#define TCU_CLK_TIMER5	5
+#define TCU_CLK_TIMER6	6
+#define TCU_CLK_TIMER7	7
+#define TCU_CLK_WDT	8
+#define TCU_CLK_OST	9
+
+#endif /* __DT_BINDINGS_CLOCK_INGENIC_TCU_H__ */
-- 
2.11.0

[PATCH v5 03/21] doc: Add doc for the Ingenic TCU hardware

[Paul Cercueil]

Add a documentation file about the Timer/Counter Unit (TCU) present in
the Ingenic JZ47xx SoCs.

The Timer/Counter Unit (TCU) in Ingenic JZ47xx SoCs is a multi-function
hardware block. It features up to to eight channels, that can be used as
counters, timers, or PWM.

- JZ4725B, JZ4750, JZ4755 only have six TCU channels. The other SoCs all
  have eight channels.

- JZ4725B introduced a separate channel, called Operating System Timer
  (OST). It is a 64-bit programmable timer.

- Each one of the TCU channels has its own clock, which can be reparented
  to three different clocks (pclk, ext, rtc), gated, and reclocked, through
  their TCSR register.
  * The watchdog and OST hardware blocks also feature a TCSR register with
    the same format in their register space.
  * The TCU registers used to gate/ungate can also gate/ungate the watchdog
    and OST clocks.

- Each TCU channel works in one of two modes:
  * mode TCU1: channels cannot work in sleep mode, but are easier to
    operate.
  * mode TCU2: channels can work in sleep mode, but the operation is a bit
    more complicated than with TCU1 channels.

- The mode of each TCU channel depends on the SoC used:
  * On the oldest SoCs (up to JZ4740), all of the eight channels operate in
    TCU1 mode.
  * On JZ4725B, channel 5 operates as TCU2, the others operate as TCU1.
  * On newest SoCs (JZ4750 and above), channels 1-2 operate as TCU2, the
    others operate as TCU1.

- Each channel can generate an interrupt. Some channels share an interrupt
  line, some don't, and this changes between SoC versions:
  * on older SoCs (JZ4740 and below), channel 0 and channel 1 have their
    own interrupt line; channels 2-7 share the last interrupt line.
  * On JZ4725B, channel 0 has its own interrupt; channels 1-5 share one
    interrupt line; the OST uses the last interrupt line.
  * on newer SoCs (JZ4750 and above), channel 5 has its own interrupt;
    channels 0-4 and (if eight channels) 6-7 all share one interrupt line;
    the OST uses the last interrupt line.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 Documentation/mips/00-INDEX        |  3 ++
 Documentation/mips/ingenic-tcu.txt | 59 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 62 insertions(+)
 create mode 100644 Documentation/mips/ingenic-tcu.txt

 v4: New patch in this series

 v5: Added information about number of channels, and improved
     documentation about channel modes

diff --git a/Documentation/mips/00-INDEX b/Documentation/mips/00-INDEX
index 8ae9cffc2262..8ab8c3f83771 100644
--- a/Documentation/mips/00-INDEX
+++ b/Documentation/mips/00-INDEX
@@ -2,3 +2,6 @@
 	- this file.
 AU1xxx_IDE.README
 	- README for MIPS AU1XXX IDE driver.
+ingenic-tcu.txt
+	- Information file about the Timer/Counter Unit present
+	  in Ingenic JZ47xx SoCs.
diff --git a/Documentation/mips/ingenic-tcu.txt b/Documentation/mips/ingenic-tcu.txt
new file mode 100644
index 000000000000..dd044c40dbfe
--- /dev/null
+++ b/Documentation/mips/ingenic-tcu.txt
@@ -0,0 +1,59 @@
+Ingenic JZ47xx SoCs Timer/Counter Unit hardware
+-----------------------------------------------
+
+The Timer/Counter Unit (TCU) in Ingenic JZ47xx SoCs is a multi-function
+hardware block. It features up to to eight channels, that can be used as
+counters, timers, or PWM.
+
+- JZ4725B, JZ4750, JZ4755 only have six TCU channels. The other SoCs all
+  have eight channels.
+
+- JZ4725B introduced a separate channel, called Operating System Timer
+  (OST). It is a 64-bit programmable timer.
+
+- Each one of the TCU channels has its own clock, which can be reparented
+  to three different clocks (pclk, ext, rtc), gated, and reclocked, through
+  their TCSR register.
+  * The watchdog and OST hardware blocks also feature a TCSR register with
+    the same format in their register space.
+  * The TCU registers used to gate/ungate can also gate/ungate the watchdog
+    and OST clocks.
+
+- Each TCU channel works in one of two modes:
+  * mode TCU1: channels cannot work in sleep mode, but are easier to
+    operate.
+  * mode TCU2: channels can work in sleep mode, but the operation is a bit
+    more complicated than with TCU1 channels.
+
+- The mode of each TCU channel depends on the SoC used:
+  * On the oldest SoCs (up to JZ4740), all of the eight channels operate in
+    TCU1 mode.
+  * On JZ4725B, channel 5 operates as TCU2, the others operate as TCU1.
+  * On newest SoCs (JZ4750 and above), channels 1-2 operate as TCU2, the
+    others operate as TCU1.
+
+- Each channel can generate an interrupt. Some channels share an interrupt
+  line, some don't, and this changes between SoC versions:
+  * on older SoCs (JZ4740 and below), channel 0 and channel 1 have their
+    own interrupt line; channels 2-7 share the last interrupt line.
+  * On JZ4725B, channel 0 has its own interrupt; channels 1-5 share one
+    interrupt line; the OST uses the last interrupt line.
+  * on newer SoCs (JZ4750 and above), channel 5 has its own interrupt;
+    channels 0-4 and (if eight channels) 6-7 all share one interrupt line;
+    the OST uses the last interrupt line.
+
+Implementation
+--------------
+
+The functionalities of the TCU hardware are spread across multiple drivers:
+- clocks/irq/timer: drivers/clocksource/ingenic-timer.c
+- PWM:              drivers/pwm/pwm-jz4740.c
+- watchdog:         drivers/watchdog/jz4740_wdt.c
+- OST:              drivers/clocksource/ingenic-ost.c
+
+Because various functionalities of the TCU that belong to different drivers
+and frameworks can be controlled from the same registers, all of these
+drivers access their registers through the same regmap.
+
+For more information regarding the devicetree bindings of the TCU drivers,
+have a look at Documentation/devicetree/bindings/mfd/ingenic,tcu.txt.
-- 
2.11.0

[PATCH v5 04/21] dt-bindings: Add doc for the Ingenic TCU drivers

[Paul Cercueil]

Add documentation about how to properly use the Ingenic TCU
(Timer/Counter Unit) drivers from devicetree.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 .../devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt |  24 +---
 .../devicetree/bindings/timer/ingenic,tcu.txt      | 147 +++++++++++++++++++++
 .../bindings/watchdog/ingenic,jz4740-wdt.txt       |  17 +--
 3 files changed, 151 insertions(+), 37 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/timer/ingenic,tcu.txt

 v4: New patch in this series. Corresponds to V2 patches 3-4-5 with
     added content.

 v5: - Edited PWM/watchdog DT bindings documentation to point to the new
       document.
     - Moved main document to
       Documentation/devicetree/bindings/timer/ingenic,tcu.txt
     - Updated documentation to reflect the new devicetree bindings.

diff --git a/Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt b/Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt
index 7d9d3f90641b..a722cdde3aa7 100644
--- a/Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt
+++ b/Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt
@@ -1,25 +1,5 @@
 Ingenic JZ47xx PWM Controller
 =============================
 
-Required properties:
-- compatible: One of:
-  * "ingenic,jz4740-pwm"
-  * "ingenic,jz4770-pwm"
-  * "ingenic,jz4780-pwm"
-- #pwm-cells: Should be 3. See pwm.txt in this directory for a description
-  of the cells format.
-- clocks : phandle to the external clock.
-- clock-names : Should be "ext".
-
-
-Example:
-
-	pwm: pwm@10002000 {
-		compatible = "ingenic,jz4740-pwm";
-		reg = <0x10002000 0x1000>;
-
-		#pwm-cells = <3>;
-
-		clocks = <&ext>;
-		clock-names = "ext";
-	};
+This documentation has moved; for a description of the devicetree bindings of
+this driver, please refer to ../timer/ingenic,tcu.txt.
diff --git a/Documentation/devicetree/bindings/timer/ingenic,tcu.txt b/Documentation/devicetree/bindings/timer/ingenic,tcu.txt
new file mode 100644
index 000000000000..65d125b460aa
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/ingenic,tcu.txt
@@ -0,0 +1,147 @@
+Ingenic JZ47xx SoCs Timer/Counter Unit devicetree bindings
+==========================================================
+
+For a description of the TCU hardware and drivers, have a look at
+Documentation/mips/ingenic-tcu.txt.
+
+Required properties:
+
+- compatible: Must be one of:
+  * ingenic,jz4740-tcu
+  * ingenic,jz4725b-tcu
+  * ingenic,jz4770-tcu
+- reg: Should be the offset/length value corresponding to the TCU registers
+- #address-cells: Should be <1>;
+- #size-cells: Should be <1>;
+- ranges: Should be one range for the full TCU registers area
+- clocks: List of phandle & clock specifiers for clocks external to the TCU.
+  The "pclk", "rtc", "ext" and "tcu" clocks should be provided.
+- clock-names: List of name strings for the external clocks.
+- #clock-cells: Should be <1>;
+  Clock consumers specify this argument to identify a clock. The valid values
+  may be found in <dt-bindings/clock/ingenic,tcu.h>.
+- interrupt-controller : Identifies the node as an interrupt controller
+- #interrupt-cells : Specifies the number of cells needed to encode an
+  interrupt source. The value should be 1.
+- interrupt-parent : phandle of the interrupt controller.
+- interrupts : Specifies the interrupt the controller is connected to.
+
+Optional properties:
+
+- ingenic,timer-channel: Specifies the TCU channel that should be used as
+  system timer. If not provided, the TCU channel 0 is used for the system timer.
+
+- ingenic,clocksource-channel: Specifies the TCU channel that should be used
+  as clocksource and sched_clock. It must be a different channel than the one
+  used as system timer. If not provided, neither a clocksource nor a
+  sched_clock is instantiated.
+
+
+Children nodes
+==========================================================
+
+
+PWM node:
+---------
+
+Required properties:
+
+- compatible: Must be one of:
+  * ingenic,jz4740-pwm
+  * ingenic,jz4725b-pwm
+- #pwm-cells: Should be 3. See ../pwm/pwm.txt for a description of the cell
+  format.
+- clocks: List of phandle & clock specifiers for the TCU clocks.
+- clock-names: List of name strings for the TCU clocks.
+
+
+Watchdog node:
+--------------
+
+Required properties:
+
+- compatible: Must be one of:
+  * ingenic,jz4740-watchdog
+  * ingenic,jz4780-watchdog
+- clocks: phandle to the RTC clock
+- clock-names: should be "rtc"
+
+
+OST node:
+---------
+
+Required properties:
+
+- compatible: Must be one of:
+  * ingenic,jz4725b-ost
+  * ingenic,jz4770-ost
+- clocks: phandle to the OST clock
+- clock-names: should be "ost"
+- interrupts : Specifies the interrupt the OST is connected to.
+
+
+Example
+==========================================================
+
+#include <dt-bindings/clock/jz4770-cgu.h>
+#include <dt-bindings/clock/ingenic,tcu.h>
+
+/ {
+	tcu: timer@10002000 {
+		compatible = "ingenic,jz4770-tcu";
+		reg = <0x10002000 0x1000>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0x0 0x10002000 0x1000>;
+
+		#clock-cells = <1>;
+
+		clocks = <&cgu JZ4770_CLK_RTC
+			  &cgu JZ4770_CLK_EXT
+			  &cgu JZ4770_CLK_PCLK
+			  &cgu JZ4770_CLK_EXT>;
+		clock-names = "rtc", "ext", "pclk", "tcu";
+
+		interrupt-controller;
+		#interrupt-cells = <1>;
+
+		interrupt-parent = <&intc>;
+		interrupts = <27 26 25>;
+
+		watchdog: watchdog@0 {
+			compatible = "ingenic,jz4740-watchdog";
+			reg = <0x0 0x10>;
+
+			clocks = <&tcu TCU_CLK_WDT>;
+			clock-names = "wdt";
+		};
+
+		pwm: pwm@10 {
+			compatible = "ingenic,jz4740-pwm";
+			reg = <0x10 0xff0>;
+
+			#pwm-cells = <3>;
+
+			clocks = <&tcu TCU_CLK_TIMER0
+				  &tcu TCU_CLK_TIMER1
+				  &tcu TCU_CLK_TIMER2
+				  &tcu TCU_CLK_TIMER3
+				  &tcu TCU_CLK_TIMER4
+				  &tcu TCU_CLK_TIMER5
+				  &tcu TCU_CLK_TIMER6
+				  &tcu TCU_CLK_TIMER7>;
+			clock-names = "timer0", "timer1", "timer2", "timer3",
+				      "timer4", "timer5", "timer6", "timer7";
+		};
+
+		ost: timer@e0 {
+			compatible = "ingenic,jz4770-ost";
+			reg = <0xe0 0x20>;
+
+			clocks = <&tcu TCU_CLK_OST>;
+			clock-names = "ost";
+
+			interrupts = <15>;
+		};
+	};
+};
diff --git a/Documentation/devicetree/bindings/watchdog/ingenic,jz4740-wdt.txt b/Documentation/devicetree/bindings/watchdog/ingenic,jz4740-wdt.txt
index ce1cb72d5345..b12ddc0c2b00 100644
--- a/Documentation/devicetree/bindings/watchdog/ingenic,jz4740-wdt.txt
+++ b/Documentation/devicetree/bindings/watchdog/ingenic,jz4740-wdt.txt
@@ -1,17 +1,4 @@
 Ingenic Watchdog Timer (WDT) Controller for JZ4740 & JZ4780
 
-Required properties:
-compatible: "ingenic,jz4740-watchdog" or "ingenic,jz4780-watchdog"
-reg: Register address and length for watchdog registers
-clocks: phandle to the RTC clock
-clock-names: should be "rtc"
-
-Example:
-
-watchdog: jz4740-watchdog@10002000 {
-	compatible = "ingenic,jz4740-watchdog";
-	reg = <0x10002000 0x10>;
-
-	clocks = <&cgu JZ4740_CLK_RTC>;
-	clock-names = "rtc";
-};
+This documentation has moved; for a description of the devicetree bindings of
+this driver, please refer to ../timer/ingenic,tcu.txt.
-- 
2.11.0

[PATCH v5 05/21] clocksource: Add a new timer-ingenic driver

[Paul Cercueil]

This driver handles the TCU (Timer Counter Unit) present on the Ingenic
JZ47xx SoCs, and provides the kernel with a system timer, and optionally
with a clocksource and a sched_clock.

It also provides clocks and interrupt handling to client drivers.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 drivers/clocksource/Kconfig         |  10 +
 drivers/clocksource/Makefile        |   1 +
 drivers/clocksource/ingenic-timer.c | 862 ++++++++++++++++++++++++++++++++++++
 drivers/clocksource/ingenic-timer.h |  15 +
 4 files changed, 888 insertions(+)
 create mode 100644 drivers/clocksource/ingenic-timer.c
 create mode 100644 drivers/clocksource/ingenic-timer.h

 v2: Use SPDX identifier for the license

 v3: - Move documentation to its own patch
     - Search the devicetree for PWM clients, and use all the TCU
	   channels that won't be used for PWM

 v4: - Add documentation about why we search for PWM clients
     - Verify that the PWM clients are for the TCU PWM driver

 v5: Major overhaul. Too many changes to list. Consider it's a new
     patch.

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index dec0dd88ec15..98f708208a8d 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -609,4 +609,14 @@ config ATCPIT100_TIMER
 	help
 	  This option enables support for the Andestech ATCPIT100 timers.
 
+config INGENIC_TIMER
+	bool "Clocksource/timer using the TCU in Ingenic JZ SoCs"
+	depends on MIPS || COMPILE_TEST
+	depends on COMMON_CLK
+	select TIMER_OF
+	select IRQ_DOMAIN
+	select REGMAP
+	help
+	  Support for the timer/counter unit of the Ingenic JZ SoCs.
+
 endmenu
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index 00caf37e52f9..26877505d400 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -75,6 +75,7 @@ obj-$(CONFIG_ASM9260_TIMER)		+= asm9260_timer.o
 obj-$(CONFIG_H8300_TMR8)		+= h8300_timer8.o
 obj-$(CONFIG_H8300_TMR16)		+= h8300_timer16.o
 obj-$(CONFIG_H8300_TPU)			+= h8300_tpu.o
+obj-$(CONFIG_INGENIC_TIMER)		+= ingenic-timer.o
 obj-$(CONFIG_CLKSRC_ST_LPC)		+= clksrc_st_lpc.o
 obj-$(CONFIG_X86_NUMACHIP)		+= numachip.o
 obj-$(CONFIG_ATCPIT100_TIMER)		+= timer-atcpit100.o
diff --git a/drivers/clocksource/ingenic-timer.c b/drivers/clocksource/ingenic-timer.c
new file mode 100644
index 000000000000..09f3a3c4b97e
--- /dev/null
+++ b/drivers/clocksource/ingenic-timer.c
@@ -0,0 +1,862 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * JZ47xx SoCs TCU IRQ driver
+ * Copyright (C) 2018 Paul Cercueil <paul@crapouillou.net>
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
+#include <linux/clockchips.h>
+#include <linux/clocksource.h>
+#include <linux/interrupt.h>
+#include <linux/irqchip.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/mfd/ingenic-tcu.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/sched_clock.h>
+
+#include <dt-bindings/clock/ingenic,tcu.h>
+
+#include "ingenic-timer.h"
+
+/* 8 channels max + watchdog + OST */
+#define TCU_CLK_COUNT	10
+
+enum tcu_clk_parent {
+	TCU_PARENT_PCLK,
+	TCU_PARENT_RTC,
+	TCU_PARENT_EXT,
+};
+
+struct ingenic_soc_info {
+	unsigned char num_channels;
+	bool has_ost;
+};
+
+struct ingenic_tcu_clk_info {
+	struct clk_init_data init_data;
+	u8 gate_bit;
+	u8 tcsr_reg;
+};
+
+struct ingenic_tcu_clk {
+	struct clk_hw hw;
+
+	struct regmap *map;
+	const struct ingenic_tcu_clk_info *info;
+
+	unsigned int idx;
+};
+
+#define to_tcu_clk(_hw) container_of(_hw, struct ingenic_tcu_clk, hw)
+
+struct ingenic_tcu {
+	const struct ingenic_soc_info *soc_info;
+	struct regmap *map;
+	struct clk *clk, *timer_clk, *clocksource_clk;
+
+	struct irq_domain *domain;
+	unsigned int nb_parent_irqs;
+	u32 parent_irqs[3];
+
+	struct clk_hw_onecell_data *clocks;
+
+	unsigned int timer_channel;
+	int clocksource_channel;
+	struct clock_event_device cevt;
+	struct clocksource cs;
+	char name[32];
+};
+
+static struct ingenic_tcu *ingenic_tcu;
+
+void __iomem *ingenic_tcu_base;
+EXPORT_SYMBOL_GPL(ingenic_tcu_base);
+
+static int ingenic_tcu_enable(struct clk_hw *hw)
+{
+	struct ingenic_tcu_clk *tcu_clk = to_tcu_clk(hw);
+	const struct ingenic_tcu_clk_info *info = tcu_clk->info;
+
+	regmap_write(tcu_clk->map, TCU_REG_TSCR, BIT(info->gate_bit));
+	return 0;
+}
+
+static void ingenic_tcu_disable(struct clk_hw *hw)
+{
+	struct ingenic_tcu_clk *tcu_clk = to_tcu_clk(hw);
+	const struct ingenic_tcu_clk_info *info = tcu_clk->info;
+
+	regmap_write(tcu_clk->map, TCU_REG_TSSR, BIT(info->gate_bit));
+}
+
+static int ingenic_tcu_is_enabled(struct clk_hw *hw)
+{
+	struct ingenic_tcu_clk *tcu_clk = to_tcu_clk(hw);
+	const struct ingenic_tcu_clk_info *info = tcu_clk->info;
+	unsigned int value;
+
+	regmap_read(tcu_clk->map, TCU_REG_TSR, &value);
+
+	return !(value & BIT(info->gate_bit));
+}
+
+static u8 ingenic_tcu_get_parent(struct clk_hw *hw)
+{
+	struct ingenic_tcu_clk *tcu_clk = to_tcu_clk(hw);
+	const struct ingenic_tcu_clk_info *info = tcu_clk->info;
+	unsigned int val = 0;
+	int ret;
+
+	ret = regmap_read(tcu_clk->map, info->tcsr_reg, &val);
+	WARN_ONCE(ret < 0, "Unable to read TCSR %i", tcu_clk->idx);
+
+	return ffs(val & TCU_TCSR_PARENT_CLOCK_MASK) - 1;
+}
+
+static int ingenic_tcu_set_parent(struct clk_hw *hw, u8 idx)
+{
+	struct ingenic_tcu_clk *tcu_clk = to_tcu_clk(hw);
+	const struct ingenic_tcu_clk_info *info = tcu_clk->info;
+	struct regmap *map = tcu_clk->map;
+	int ret;
+
+	/*
+	 * Our clock provider has the CLK_SET_PARENT_GATE flag set, so we know
+	 * that the clk is in unprepared state. To be able to access TCSR
+	 * we must ungate the clock supply and we gate it again when done.
+	 */
+
+	regmap_write(map, TCU_REG_TSCR, BIT(info->gate_bit));
+
+	ret = regmap_update_bits(map, info->tcsr_reg,
+				TCU_TCSR_PARENT_CLOCK_MASK, BIT(idx));
+	WARN_ONCE(ret < 0, "Unable to update TCSR %i", tcu_clk->idx);
+
+	regmap_write(map, TCU_REG_TSSR, BIT(info->gate_bit));
+
+	return 0;
+}
+
+static unsigned long ingenic_tcu_recalc_rate(struct clk_hw *hw,
+		unsigned long parent_rate)
+{
+	struct ingenic_tcu_clk *tcu_clk = to_tcu_clk(hw);
+	const struct ingenic_tcu_clk_info *info = tcu_clk->info;
+	unsigned int prescale;
+	int ret;
+
+	ret = regmap_read(tcu_clk->map, info->tcsr_reg, &prescale);
+	WARN_ONCE(ret < 0, "Unable to read TCSR %i", tcu_clk->idx);
+
+	prescale = (prescale & TCU_TCSR_PRESCALE_MASK) >> TCU_TCSR_PRESCALE_LSB;
+
+	return parent_rate >> (prescale * 2);
+}
+
+static long ingenic_tcu_round_rate(struct clk_hw *hw, unsigned long req_rate,
+		unsigned long *parent_rate)
+{
+	unsigned long rate = *parent_rate;
+	unsigned int shift;
+
+	if (req_rate > rate)
+		return -EINVAL;
+
+	for (shift = 0; shift < 10; shift += 2)
+		if ((rate >> shift) <= req_rate)
+			break;
+
+	return rate >> shift;
+}
+
+static int ingenic_tcu_set_rate(struct clk_hw *hw, unsigned long req_rate,
+		unsigned long parent_rate)
+{
+	struct ingenic_tcu_clk *tcu_clk = to_tcu_clk(hw);
+	const struct ingenic_tcu_clk_info *info = tcu_clk->info;
+	struct regmap *map = tcu_clk->map;
+	u8 prescale = (ffs(parent_rate / req_rate) / 2)
+			<< TCU_TCSR_PRESCALE_LSB;
+	int ret;
+
+	/*
+	 * Our clock provider has the CLK_SET_RATE_GATE flag set, so we know
+	 * that the clk is in unprepared state. To be able to access TCSR
+	 * we must ungate the clock supply and we gate it again when done.
+	 */
+
+	regmap_write(map, TCU_REG_TSCR, BIT(info->gate_bit));
+
+	ret = regmap_update_bits(map, info->tcsr_reg,
+				TCU_TCSR_PRESCALE_MASK, prescale);
+	WARN_ONCE(ret < 0, "Unable to update TCSR %i", tcu_clk->idx);
+
+	regmap_write(map, TCU_REG_TSSR, BIT(info->gate_bit));
+
+	return 0;
+}
+
+static const struct clk_ops ingenic_tcu_clk_ops = {
+	.get_parent	= ingenic_tcu_get_parent,
+	.set_parent	= ingenic_tcu_set_parent,
+
+	.recalc_rate	= ingenic_tcu_recalc_rate,
+	.round_rate	= ingenic_tcu_round_rate,
+	.set_rate	= ingenic_tcu_set_rate,
+
+	.enable		= ingenic_tcu_enable,
+	.disable	= ingenic_tcu_disable,
+	.is_enabled	= ingenic_tcu_is_enabled,
+};
+
+static const char * const ingenic_tcu_timer_parents[] = {
+	[TCU_PARENT_PCLK] = "pclk",
+	[TCU_PARENT_RTC]  = "rtc",
+	[TCU_PARENT_EXT]  = "ext",
+};
+
+#define DEF_TIMER(_name, _gate_bit, _tcsr)				\
+	{								\
+		.init_data = {						\
+			.name = _name,					\
+			.parent_names = ingenic_tcu_timer_parents,	\
+			.num_parents = ARRAY_SIZE(ingenic_tcu_timer_parents),\
+			.ops = &ingenic_tcu_clk_ops,			\
+			.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE,\
+		},							\
+		.gate_bit = _gate_bit,					\
+		.tcsr_reg = _tcsr,					\
+	}
+static const struct ingenic_tcu_clk_info ingenic_tcu_clk_info[] = {
+	[TCU_CLK_TIMER0] = DEF_TIMER("timer0", 0, TCU_REG_TCSRc(0)),
+	[TCU_CLK_TIMER1] = DEF_TIMER("timer1", 1, TCU_REG_TCSRc(1)),
+	[TCU_CLK_TIMER2] = DEF_TIMER("timer2", 2, TCU_REG_TCSRc(2)),
+	[TCU_CLK_TIMER3] = DEF_TIMER("timer3", 3, TCU_REG_TCSRc(3)),
+	[TCU_CLK_TIMER4] = DEF_TIMER("timer4", 4, TCU_REG_TCSRc(4)),
+	[TCU_CLK_TIMER5] = DEF_TIMER("timer5", 5, TCU_REG_TCSRc(5)),
+	[TCU_CLK_TIMER6] = DEF_TIMER("timer6", 6, TCU_REG_TCSRc(6)),
+	[TCU_CLK_TIMER7] = DEF_TIMER("timer7", 7, TCU_REG_TCSRc(7)),
+};
+
+static const struct ingenic_tcu_clk_info ingenic_tcu_watchdog_clk_info =
+				DEF_TIMER("wdt", 16, TCU_REG_WDT_TCSR);
+static const struct ingenic_tcu_clk_info ingenic_tcu_ost_clk_info =
+				DEF_TIMER("ost", 15, TCU_REG_OST_TCSR);
+#undef DEF_TIMER
+
+static void ingenic_tcu_intc_cascade(struct irq_desc *desc)
+{
+	struct irq_chip *irq_chip = irq_data_get_irq_chip(&desc->irq_data);
+	struct irq_domain *domain = irq_desc_get_handler_data(desc);
+	struct irq_chip_generic *gc = irq_get_domain_generic_chip(domain, 0);
+	struct regmap *map = gc->private;
+	uint32_t irq_reg, irq_mask;
+	unsigned int i;
+
+	regmap_read(map, TCU_REG_TFR, &irq_reg);
+	regmap_read(map, TCU_REG_TMR, &irq_mask);
+
+	chained_irq_enter(irq_chip, desc);
+
+	irq_reg &= ~irq_mask;
+
+	for_each_set_bit(i, (unsigned long *)&irq_reg, 32)
+		generic_handle_irq(irq_linear_revmap(domain, i));
+
+	chained_irq_exit(irq_chip, desc);
+}
+
+static void ingenic_tcu_gc_unmask_enable_reg(struct irq_data *d)
+{
+	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+	struct irq_chip_type *ct = irq_data_get_chip_type(d);
+	struct regmap *map = gc->private;
+	u32 mask = d->mask;
+
+	irq_gc_lock(gc);
+	regmap_write(map, ct->regs.ack, mask);
+	regmap_write(map, ct->regs.enable, mask);
+	*ct->mask_cache |= mask;
+	irq_gc_unlock(gc);
+}
+
+static void ingenic_tcu_gc_mask_disable_reg(struct irq_data *d)
+{
+	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+	struct irq_chip_type *ct = irq_data_get_chip_type(d);
+	struct regmap *map = gc->private;
+	u32 mask = d->mask;
+
+	irq_gc_lock(gc);
+	regmap_write(map, ct->regs.disable, mask);
+	*ct->mask_cache &= ~mask;
+	irq_gc_unlock(gc);
+}
+
+static void ingenic_tcu_gc_mask_disable_reg_and_ack(struct irq_data *d)
+{
+	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+	struct irq_chip_type *ct = irq_data_get_chip_type(d);
+	struct regmap *map = gc->private;
+	u32 mask = d->mask;
+
+	irq_gc_lock(gc);
+	regmap_write(map, ct->regs.ack, mask);
+	regmap_write(map, ct->regs.disable, mask);
+	irq_gc_unlock(gc);
+}
+
+static u64 notrace ingenic_tcu_timer_read(void)
+{
+	unsigned int channel = ingenic_tcu->clocksource_channel;
+
+	return readw(ingenic_tcu_base + TCU_REG_TCNTc(channel));
+}
+
+static inline struct ingenic_tcu *to_ingenic_tcu(struct clock_event_device *evt)
+{
+	return container_of(evt, struct ingenic_tcu, cevt);
+}
+
+static int ingenic_tcu_cevt_set_state_shutdown(struct clock_event_device *evt)
+{
+	struct ingenic_tcu *tcu = to_ingenic_tcu(evt);
+
+	regmap_write(tcu->map, TCU_REG_TECR, BIT(tcu->timer_channel));
+	return 0;
+}
+
+static int ingenic_tcu_cevt_set_next(unsigned long next,
+				     struct clock_event_device *evt)
+{
+	struct ingenic_tcu *tcu = to_ingenic_tcu(evt);
+	unsigned int timer_channel = tcu->timer_channel;
+
+	if (next > 0xffff)
+		return -EINVAL;
+
+	regmap_write(tcu->map, TCU_REG_TDFRc(timer_channel), next);
+	regmap_write(tcu->map, TCU_REG_TCNTc(timer_channel), 0);
+	regmap_write(tcu->map, TCU_REG_TESR, BIT(timer_channel));
+
+	return 0;
+}
+
+static irqreturn_t ingenic_tcu_cevt_cb(int irq, void *dev_id)
+{
+	struct clock_event_device *evt = dev_id;
+	struct ingenic_tcu *tcu = to_ingenic_tcu(evt);
+
+	regmap_write(tcu->map, TCU_REG_TECR, BIT(tcu->timer_channel));
+
+	if (evt->event_handler)
+		evt->event_handler(evt);
+
+	return IRQ_HANDLED;
+}
+
+static int __init ingenic_tcu_register_clock(struct ingenic_tcu *tcu,
+			unsigned int idx, enum tcu_clk_parent parent,
+			const struct ingenic_tcu_clk_info *info,
+			struct clk_hw_onecell_data *clocks)
+{
+	struct ingenic_tcu_clk *tcu_clk;
+	int err;
+
+	tcu_clk = kzalloc(sizeof(*tcu_clk), GFP_KERNEL);
+	if (!tcu_clk)
+		return -ENOMEM;
+
+	tcu_clk->hw.init = &info->init_data;
+	tcu_clk->idx = idx;
+	tcu_clk->info = info;
+	tcu_clk->map = tcu->map;
+
+	/* Reset channel and clock divider, set default parent */
+	ingenic_tcu_enable(&tcu_clk->hw);
+	regmap_update_bits(tcu->map, info->tcsr_reg, 0xffff, BIT(parent));
+	ingenic_tcu_disable(&tcu_clk->hw);
+
+	err = clk_hw_register(NULL, &tcu_clk->hw);
+	if (err)
+		goto err_free_tcu_clk;
+
+	err = clk_hw_register_clkdev(&tcu_clk->hw, info->init_data.name, NULL);
+	if (err)
+		goto err_clk_unregister;
+
+	clocks->hws[idx] = &tcu_clk->hw;
+	return 0;
+
+err_clk_unregister:
+	clk_hw_unregister(&tcu_clk->hw);
+err_free_tcu_clk:
+	kfree(tcu_clk);
+	return err;
+}
+
+static int __init ingenic_tcu_clk_init(struct ingenic_tcu *tcu,
+				       struct device_node *np)
+{
+	size_t i;
+	int ret;
+
+	tcu->clocks = kzalloc(sizeof(*tcu->clocks) +
+			 sizeof(*tcu->clocks->hws) * TCU_CLK_COUNT,
+			 GFP_KERNEL);
+	if (!tcu->clocks)
+		return -ENOMEM;
+
+	tcu->clocks->num = TCU_CLK_COUNT;
+
+	for (i = 0; i < tcu->soc_info->num_channels; i++) {
+		ret = ingenic_tcu_register_clock(tcu, i, TCU_PARENT_EXT,
+				&ingenic_tcu_clk_info[i], tcu->clocks);
+		if (ret) {
+			pr_err("timer-ingenic: cannot register clock %i\n", i);
+			goto err_unregister_timer_clocks;
+		}
+	}
+
+	/*
+	 * We set EXT as the default parent clock for all the TCU clocks
+	 * except for the watchdog one, where we set the RTC clock as the
+	 * parent. Since the EXT and PCLK are much faster than the RTC clock,
+	 * the watchdog would kick after a maximum time of 5s, and we might
+	 * want a slower kicking time.
+	 */
+	ret = ingenic_tcu_register_clock(tcu, TCU_CLK_WDT, TCU_PARENT_RTC,
+				&ingenic_tcu_watchdog_clk_info, tcu->clocks);
+	if (ret) {
+		pr_err("timer-ingenic: cannot register watchdog clock\n");
+		goto err_unregister_timer_clocks;
+	}
+
+	if (tcu->soc_info->has_ost) {
+		ret = ingenic_tcu_register_clock(tcu, TCU_CLK_OST,
+					TCU_PARENT_EXT,
+					&ingenic_tcu_ost_clk_info,
+					tcu->clocks);
+		if (ret) {
+			pr_err("timer-ingenic: cannot register ost clock\n");
+			goto err_unregister_watchdog_clock;
+		}
+	}
+
+	ret = of_clk_add_hw_provider(np, of_clk_hw_onecell_get, tcu->clocks);
+	if (ret) {
+		pr_err("%s: cannot add OF clock provider\n", __func__);
+		goto err_unregister_ost_clock;
+	}
+
+	return 0;
+
+err_unregister_ost_clock:
+	if (tcu->soc_info->has_ost)
+		clk_hw_unregister(tcu->clocks->hws[i + 1]);
+err_unregister_watchdog_clock:
+	clk_hw_unregister(tcu->clocks->hws[i]);
+err_unregister_timer_clocks:
+	for (i = 0; i < tcu->clocks->num; i++)
+		if (tcu->clocks->hws[i])
+			clk_hw_unregister(tcu->clocks->hws[i]);
+	kfree(tcu->clocks);
+	return ret;
+}
+
+static void __init ingenic_tcu_clk_cleanup(struct ingenic_tcu *tcu,
+					   struct device_node *np)
+{
+	unsigned int i;
+
+	of_clk_del_provider(np);
+
+	for (i = 0; i < tcu->clocks->num; i++)
+		clk_hw_unregister(tcu->clocks->hws[i]);
+	kfree(tcu->clocks);
+}
+
+static int __init ingenic_tcu_intc_init(struct ingenic_tcu *tcu,
+					struct device_node *np)
+{
+	struct irq_chip_generic *gc;
+	struct irq_chip_type *ct;
+	int err, i, irqs;
+
+	irqs = of_property_count_elems_of_size(np, "interrupts", sizeof(u32));
+	if (irqs < 0 || irqs > ARRAY_SIZE(tcu->parent_irqs))
+		return -EINVAL;
+
+	tcu->nb_parent_irqs = irqs;
+
+	tcu->domain = irq_domain_add_linear(np, 32,
+			&irq_generic_chip_ops, NULL);
+	if (!tcu->domain)
+		return -ENOMEM;
+
+	err = irq_alloc_domain_generic_chips(tcu->domain, 32, 1, "TCU",
+			handle_level_irq, 0, IRQ_NOPROBE | IRQ_LEVEL, 0);
+	if (err)
+		goto out_domain_remove;
+
+	gc = irq_get_domain_generic_chip(tcu->domain, 0);
+	ct = gc->chip_types;
+
+	gc->wake_enabled = IRQ_MSK(32);
+	gc->private = tcu->map;
+
+	ct->regs.disable = TCU_REG_TMSR;
+	ct->regs.enable = TCU_REG_TMCR;
+	ct->regs.ack = TCU_REG_TFCR;
+	ct->chip.irq_unmask = ingenic_tcu_gc_unmask_enable_reg;
+	ct->chip.irq_mask = ingenic_tcu_gc_mask_disable_reg;
+	ct->chip.irq_mask_ack = ingenic_tcu_gc_mask_disable_reg_and_ack;
+	ct->chip.flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_SKIP_SET_WAKE;
+
+	/* Mask all IRQs by default */
+	regmap_write(tcu->map, TCU_REG_TMSR, IRQ_MSK(32));
+
+	/* On JZ4740, timer 0 and timer 1 have their own interrupt line;
+	 * timers 2-7 share one interrupt.
+	 * On SoCs >= JZ4770, timer 5 has its own interrupt line;
+	 * timers 0-4 and 6-7 share one single interrupt.
+	 *
+	 * To keep things simple, we just register the same handler to
+	 * all parent interrupts. The handler will properly detect which
+	 * channel fired the interrupt.
+	 */
+	for (i = 0; i < irqs; i++) {
+		tcu->parent_irqs[i] = irq_of_parse_and_map(np, i);
+		if (!tcu->parent_irqs[i]) {
+			err = -EINVAL;
+			goto out_unmap_irqs;
+		}
+
+		irq_set_chained_handler_and_data(tcu->parent_irqs[i],
+				ingenic_tcu_intc_cascade, tcu->domain);
+	}
+
+	return 0;
+
+out_unmap_irqs:
+	for (; i > 0; i--)
+		irq_dispose_mapping(tcu->parent_irqs[i - 1]);
+out_domain_remove:
+	irq_domain_remove(tcu->domain);
+	return err;
+}
+
+static void __init ingenic_tcu_intc_cleanup(struct ingenic_tcu *tcu)
+{
+	unsigned int i;
+
+	for (i = 0; i < tcu->nb_parent_irqs; i++)
+		irq_dispose_mapping(tcu->parent_irqs[i]);
+
+	irq_domain_remove(tcu->domain);
+}
+
+static int __init ingenic_tcu_timer_init(struct ingenic_tcu *tcu)
+{
+	unsigned long rate;
+	int err, virq;
+
+	tcu->timer_clk = tcu->clocks->hws[tcu->timer_channel]->clk;
+
+	err = clk_prepare_enable(tcu->timer_clk);
+	if (err)
+		return err;
+
+	rate = clk_get_rate(tcu->timer_clk);
+	if (!rate) {
+		err = -EINVAL;
+		goto err_clk_disable;
+	}
+
+	virq = irq_create_mapping(tcu->domain, tcu->timer_channel);
+	if (!virq) {
+		err = -EINVAL;
+		goto err_clk_disable;
+	}
+
+	snprintf(tcu->name, sizeof(tcu->name), "TCU%u", tcu->timer_channel);
+
+	err = request_irq(virq, ingenic_tcu_cevt_cb, IRQF_TIMER,
+			  tcu->name, &tcu->cevt);
+	if (err)
+		goto err_irq_dispose_mapping;
+
+	tcu->cevt.cpumask = cpumask_of(smp_processor_id());
+	tcu->cevt.features = CLOCK_EVT_FEAT_ONESHOT;
+	tcu->cevt.name = tcu->name;
+	tcu->cevt.rating = 200;
+	tcu->cevt.set_state_shutdown = ingenic_tcu_cevt_set_state_shutdown;
+	tcu->cevt.set_next_event = ingenic_tcu_cevt_set_next;
+
+	clockevents_config_and_register(&tcu->cevt, rate, 10, 0xffff);
+
+	return 0;
+
+err_irq_dispose_mapping:
+	irq_dispose_mapping(virq);
+err_clk_disable:
+	clk_disable_unprepare(tcu->timer_clk);
+	return err;
+}
+
+static int __init ingenic_tcu_clocksource_init(struct ingenic_tcu *tcu)
+{
+	unsigned int channel = tcu->clocksource_channel;
+	struct clocksource *cs = &tcu->cs;
+	unsigned long rate;
+	int err;
+
+	tcu->clocksource_clk = tcu->clocks->hws[channel]->clk;
+
+	err = clk_prepare_enable(tcu->clocksource_clk);
+	if (err)
+		return err;
+
+	rate = clk_get_rate(tcu->clocksource_clk);
+	if (!rate) {
+		err = -EINVAL;
+		goto err_clk_disable;
+	}
+
+	/* Reset channel */
+	regmap_update_bits(tcu->map, TCU_REG_TCSRc(channel),
+			   0xffff & ~TCU_TCSR_RESERVED_BITS, 0);
+
+	/* Reset counter */
+	regmap_write(tcu->map, TCU_REG_TDFRc(channel), 0xffff);
+	regmap_write(tcu->map, TCU_REG_TCNTc(channel), 0);
+
+	/* Enable channel */
+	regmap_write(tcu->map, TCU_REG_TESR, BIT(channel));
+
+	cs->name = "ingenic-timer";
+	cs->rating = 200;
+	cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
+	cs->mask = CLOCKSOURCE_MASK(16);
+	cs->read = (u64 (*)(struct clocksource *))ingenic_tcu_timer_read;
+
+	err = clocksource_register_hz(cs, rate);
+	if (err)
+		goto err_clk_disable;
+
+	sched_clock_register(ingenic_tcu_timer_read, 16, rate);
+
+	return 0;
+
+err_clk_disable:
+	clk_disable_unprepare(tcu->clocksource_clk);
+	return err;
+}
+
+static void __init ingenic_tcu_clocksource_cleanup(struct ingenic_tcu *tcu)
+{
+	clocksource_unregister(&tcu->cs);
+	clk_disable_unprepare(tcu->clocksource_clk);
+}
+
+static const struct regmap_config ingenic_tcu_regmap_config = {
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+};
+
+static const struct ingenic_soc_info jz4740_soc_info = {
+	.num_channels = 8,
+	.has_ost = false,
+};
+
+static const struct ingenic_soc_info jz4725b_soc_info = {
+	.num_channels = 6,
+	.has_ost = true,
+};
+
+static const struct ingenic_soc_info jz4770_soc_info = {
+	.num_channels = 8,
+	.has_ost = true,
+};
+
+static const struct of_device_id ingenic_tcu_of_match[] = {
+	{ .compatible = "ingenic,jz4740-tcu",  .data = &jz4740_soc_info, },
+	{ .compatible = "ingenic,jz4725b-tcu", .data = &jz4725b_soc_info, },
+	{ .compatible = "ingenic,jz4770-tcu",  .data = &jz4770_soc_info, },
+	{ }
+};
+
+static int __init ingenic_tcu_init(struct device_node *np)
+{
+	const struct of_device_id *id = of_match_node(ingenic_tcu_of_match, np);
+	struct ingenic_tcu *tcu;
+	struct resource res;
+	void __iomem *base;
+	int ret;
+
+	of_node_clear_flag(np, OF_POPULATED);
+
+	tcu = kzalloc(sizeof(*tcu), GFP_KERNEL);
+	if (!tcu)
+		return -ENOMEM;
+
+	tcu->soc_info = (const struct ingenic_soc_info *)id->data;
+	ingenic_tcu = tcu;
+
+	of_property_read_u32(np, "ingenic,timer-channel", &tcu->timer_channel);
+	if (tcu->timer_channel >= tcu->soc_info->num_channels) {
+		pr_warn("ingenic-tcu: Invalid requested channel\n");
+		tcu->timer_channel = 0;
+	}
+
+	tcu->clocksource_channel = -1;
+	of_property_read_u32(np, "ingenic,clocksource-channel",
+			     &tcu->clocksource_channel);
+	if (tcu->clocksource_channel >= tcu->soc_info->num_channels ||
+			tcu->clocksource_channel == tcu->timer_channel) {
+		pr_warn("ingenic-tcu: Invalid requested channel\n");
+		tcu->clocksource_channel = -1;
+	}
+
+	base = of_io_request_and_map(np, 0, NULL);
+	if (IS_ERR(base)) {
+		ret = PTR_ERR(base);
+		goto err_free_ingenic_tcu;
+	}
+
+	ingenic_tcu_base = base;
+
+	tcu->map = regmap_init_mmio(NULL, base, &ingenic_tcu_regmap_config);
+	if (IS_ERR(tcu->map)) {
+		ret = PTR_ERR(tcu->map);
+		goto err_iounmap;
+	}
+
+	tcu->clk = of_clk_get_by_name(np, "tcu");
+	if (IS_ERR(tcu->clk)) {
+		ret = PTR_ERR(tcu->clk);
+		pr_crit("ingenic-tcu: Unable to find TCU clock: %i\n", ret);
+		goto err_free_regmap;
+	}
+
+	ret = clk_prepare_enable(tcu->clk);
+	if (ret) {
+		pr_crit("ingenic-tcu: Unable to enable TCU clock: %i\n", ret);
+		goto err_clk_put;
+	}
+
+	ret = ingenic_tcu_intc_init(tcu, np);
+	if (ret)
+		goto err_clk_disable;
+
+	ret = ingenic_tcu_clk_init(tcu, np);
+	if (ret)
+		goto err_tcu_intc_cleanup;
+
+	if (tcu->clocksource_channel > 0) {
+		ret = ingenic_tcu_clocksource_init(tcu);
+		if (ret)
+			goto err_tcu_clk_cleanup;
+	}
+
+	ret = ingenic_tcu_timer_init(tcu);
+	if (ret)
+		goto err_tcu_clocksource_cleanup;
+
+	return 0;
+
+err_tcu_clocksource_cleanup:
+	if (tcu->clocksource_channel > 0)
+		ingenic_tcu_clocksource_cleanup(tcu);
+err_tcu_clk_cleanup:
+	ingenic_tcu_clk_cleanup(tcu, np);
+err_tcu_intc_cleanup:
+	ingenic_tcu_intc_cleanup(tcu);
+err_clk_disable:
+	clk_disable_unprepare(tcu->clk);
+err_clk_put:
+	clk_put(tcu->clk);
+err_free_regmap:
+	regmap_exit(tcu->map);
+err_iounmap:
+	iounmap(base);
+	of_address_to_resource(np, 0, &res);
+	release_mem_region(res.start, resource_size(&res));
+err_free_ingenic_tcu:
+	kfree(tcu);
+	return ret;
+}
+
+TIMER_OF_DECLARE(jz4740_tcu_intc,  "ingenic,jz4740-tcu",  ingenic_tcu_init);
+TIMER_OF_DECLARE(jz4725b_tcu_intc, "ingenic,jz4725b-tcu", ingenic_tcu_init);
+
+
+static int __init ingenic_tcu_probe(struct platform_device *pdev)
+{
+	platform_set_drvdata(pdev, ingenic_tcu);
+
+	regmap_attach_dev(&pdev->dev, ingenic_tcu->map,
+			  &ingenic_tcu_regmap_config);
+
+	return devm_of_platform_populate(&pdev->dev);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int ingenic_tcu_suspend(struct device *dev)
+{
+	struct ingenic_tcu *tcu = dev_get_drvdata(dev);
+
+	clk_disable(tcu->timer_clk);
+	clk_disable(tcu->clk);
+	return 0;
+}
+
+static int ingenic_tcu_resume(struct device *dev)
+{
+	struct ingenic_tcu *tcu = dev_get_drvdata(dev);
+	int ret;
+
+	ret = clk_enable(tcu->clk);
+	if (ret)
+		return ret;
+
+	ret = clk_enable(tcu->timer_clk);
+	if (ret) {
+		clk_disable(tcu->clk);
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct dev_pm_ops ingenic_tcu_pm_ops = {
+	/* _noirq: We want the TCU clock to be gated last / ungated first */
+	.suspend_noirq = ingenic_tcu_suspend,
+	.resume_noirq  = ingenic_tcu_resume,
+};
+#define INGENIC_TCU_PM_OPS (&ingenic_tcu_pm_ops)
+
+#else
+#define INGENIC_TCU_PM_OPS NULL
+#endif /* CONFIG_PM_SUSPEND */
+
+static struct platform_driver ingenic_tcu_driver = {
+	.probe = ingenic_tcu_probe,
+	.driver = {
+		.name	= "ingenic-tcu",
+		.pm	= INGENIC_TCU_PM_OPS,
+		.of_match_table = ingenic_tcu_of_match,
+		.suppress_bind_attrs = true,
+	},
+};
+module_platform_driver(ingenic_tcu_driver);
diff --git a/drivers/clocksource/ingenic-timer.h b/drivers/clocksource/ingenic-timer.h
new file mode 100644
index 000000000000..fa43da836ab6
--- /dev/null
+++ b/drivers/clocksource/ingenic-timer.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __DRIVERS_CLOCKSOURCE_INGENIC_TIMER_H__
+#define __DRIVERS_CLOCKSOURCE_INGENIC_TIMER_H__
+
+#include <linux/compiler_types.h>
+
+/*
+ * README: For use *ONLY* by the ingenic-ost driver.
+ * Regular drivers which want to access the TCU registers
+ * must have ingenic-timer as parent and retrieve the regmap
+ * doing dev_get_regmap(pdev->dev.parent);
+ */
+extern void __iomem *ingenic_tcu_base;
+
+#endif /* __DRIVERS_CLOCKSOURCE_INGENIC_TIMER_H__ */
-- 
2.11.0

[PATCH v5 06/21] clocksource: Add driver for the Ingenic JZ47xx OST

[Paul Cercueil]

From: Maarten ter Huurne <maarten@treewalker.org>

OST is the OS Timer, a 64-bit timer/counter with buffered reading.

SoCs before the JZ4770 had (if any) a 32-bit OST; the JZ4770 and
JZ4780 have a 64-bit OST.

This driver will register both a clocksource and a sched_clock to the
system.

Signed-off-by: Maarten ter Huurne <maarten@treewalker.org>
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 drivers/clocksource/Kconfig       |   8 ++
 drivers/clocksource/Makefile      |   1 +
 drivers/clocksource/ingenic-ost.c | 199 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 208 insertions(+)
 create mode 100644 drivers/clocksource/ingenic-ost.c

 v5: New patch

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index 98f708208a8d..e855938c69f1 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -619,4 +619,12 @@ config INGENIC_TIMER
 	help
 	  Support for the timer/counter unit of the Ingenic JZ SoCs.
 
+config INGENIC_OST
+	bool "Ingenic JZ47xx Operating System Timer"
+	depends on MIPS || COMPILE_TEST
+	depends on COMMON_CLK
+	select INGENIC_TIMER
+	help
+	  Support for the OS Timer of the Ingenic JZ4770 or similar SoC.
+
 endmenu
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index 26877505d400..56ce37252944 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -75,6 +75,7 @@ obj-$(CONFIG_ASM9260_TIMER)		+= asm9260_timer.o
 obj-$(CONFIG_H8300_TMR8)		+= h8300_timer8.o
 obj-$(CONFIG_H8300_TMR16)		+= h8300_timer16.o
 obj-$(CONFIG_H8300_TPU)			+= h8300_tpu.o
+obj-$(CONFIG_INGENIC_OST)		+= ingenic-ost.o
 obj-$(CONFIG_INGENIC_TIMER)		+= ingenic-timer.o
 obj-$(CONFIG_CLKSRC_ST_LPC)		+= clksrc_st_lpc.o
 obj-$(CONFIG_X86_NUMACHIP)		+= numachip.o
diff --git a/drivers/clocksource/ingenic-ost.c b/drivers/clocksource/ingenic-ost.c
new file mode 100644
index 000000000000..224e78926f29
--- /dev/null
+++ b/drivers/clocksource/ingenic-ost.c
@@ -0,0 +1,199 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * JZ47xx SoCs TCU Operating System Timer driver
+ *
+ * Copyright (C) 2016 Maarten ter Huurne <maarten@treewalker.org>
+ * Copyright (C) 2018 Paul Cercueil <paul@crapouillou.net>
+ */
+
+#include <linux/clk.h>
+#include <linux/clocksource.h>
+#include <linux/mfd/ingenic-tcu.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/regmap.h>
+#include <linux/sched_clock.h>
+
+#include "ingenic-timer.h"
+
+#define TCU_OST_TCSR_MASK	0xc0
+#define TCU_OST_TCSR_CNT_MD	BIT(15)
+
+#define TCU_OST_CHANNEL		15
+
+enum jz_version {
+	ID_JZ4725B,
+	ID_JZ4770,
+};
+
+struct ingenic_ost {
+	enum jz_version version;
+
+	struct regmap *map;
+	struct clk *clk;
+
+	struct clocksource cs;
+};
+
+static u64 notrace ingenic_ost_read_cntl(void)
+{
+	/* Bypass the regmap here as we must return as soon as possible */
+	return readl(ingenic_tcu_base + TCU_REG_OST_CNTL);
+}
+
+static u64 notrace ingenic_ost_read_cnth(void)
+{
+	/* Bypass the regmap here as we must return as soon as possible */
+	return readl(ingenic_tcu_base + TCU_REG_OST_CNTH);
+}
+
+static u64 notrace ingenic_ost_clocksource_read(struct clocksource *cs)
+{
+	u32 val1, val2;
+	u64 count, recount;
+	s64 diff;
+
+	/*
+	 * The buffering of the upper 32 bits of the timer prevents wrong
+	 * results from the bottom 32 bits overflowing due to the timer ticking
+	 * along. However, it does not prevent wrong results from simultaneous
+	 * reads of the timer, which could reset the buffer mid-read.
+	 * Since this kind of wrong read can happen only when the bottom bits
+	 * overflow, there will be minutes between wrong reads, so if we read
+	 * twice in succession, at least one of the reads will be correct.
+	 */
+
+	/* Bypass the regmap here as we must return as soon as possible */
+	val1 = readl(ingenic_tcu_base + TCU_REG_OST_CNTL);
+	val2 = readl(ingenic_tcu_base + TCU_REG_OST_CNTHBUF);
+	count = (u64)val1 | (u64)val2 << 32;
+
+	val1 = readl(ingenic_tcu_base + TCU_REG_OST_CNTL);
+	val2 = readl(ingenic_tcu_base + TCU_REG_OST_CNTHBUF);
+	recount = (u64)val1 | (u64)val2 << 32;
+
+	/*
+	 * A wrong read will produce a result that is 1<<32 too high: the bottom
+	 * part from before overflow and the upper part from after overflow.
+	 * Therefore, the lower value of the two reads is the correct value.
+	 */
+
+	diff = (s64)(recount - count);
+	if (unlikely(diff < 0))
+		count = recount;
+
+	return count;
+}
+
+static const struct of_device_id ingenic_ost_of_match[] = {
+	{ .compatible = "ingenic,jz4725b-ost", .data = (void *)ID_JZ4725B, },
+	{ .compatible = "ingenic,jz4770-ost",  .data = (void *)ID_JZ4770,  },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ingenic_ost_of_match);
+
+static int __init ingenic_ost_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct ingenic_ost *ost;
+	struct clocksource *cs;
+	unsigned long rate, flags;
+	int err;
+
+	ost = devm_kzalloc(dev, sizeof(*ost), GFP_KERNEL);
+	if (!ost)
+		return -ENOMEM;
+
+	ost->map = dev_get_regmap(dev->parent, NULL);
+	if (IS_ERR(ost->map))
+		return PTR_ERR(ost->map);
+
+	ost->clk = devm_clk_get(dev, "ost");
+	if (IS_ERR(ost->clk))
+		return PTR_ERR(ost->clk);
+
+	ost->version = (enum jz_version)of_device_get_match_data(dev);
+
+	err = clk_prepare_enable(ost->clk);
+	if (err)
+		return err;
+
+	/* Clear counter high/low registers */
+	if (ost->version == ID_JZ4770)
+		regmap_write(ost->map, TCU_REG_OST_CNTL, 0);
+	regmap_write(ost->map, TCU_REG_OST_CNTH, 0);
+
+	/* Don't reset counter at compare value. */
+	regmap_update_bits(ost->map, TCU_REG_OST_TCSR,
+			   TCU_OST_TCSR_MASK, TCU_OST_TCSR_CNT_MD);
+
+	rate = clk_get_rate(ost->clk);
+
+	/* Enable OST TCU channel */
+	regmap_write(ost->map, TCU_REG_TESR, BIT(TCU_OST_CHANNEL));
+
+	cs = &ost->cs;
+	cs->name	= "ingenic-ost";
+	cs->rating	= 320;
+	cs->flags	= CLOCK_SOURCE_IS_CONTINUOUS;
+
+	if (ost->version == ID_JZ4770) {
+		cs->mask = CLOCKSOURCE_MASK(64);
+		cs->read = ingenic_ost_clocksource_read;
+	} else {
+		cs->mask = CLOCKSOURCE_MASK(32);
+		cs->read = (u64 (*)(struct clocksource *))ingenic_ost_read_cnth;
+	}
+
+	err = clocksource_register_hz(cs, rate);
+	if (err) {
+		dev_err(dev, "clocksource registration failed: %d\n", err);
+		clk_disable_unprepare(ost->clk);
+		return err;
+	}
+
+	/* Cannot register a sched_clock with interrupts on */
+	local_irq_save(flags);
+	if (ost->version == ID_JZ4770)
+		sched_clock_register(ingenic_ost_read_cntl, 32, rate);
+	else
+		sched_clock_register(ingenic_ost_read_cnth, 32, rate);
+	local_irq_restore(flags);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int ingenic_ost_suspend(struct device *dev)
+{
+	struct ingenic_ost *ost = dev_get_drvdata(dev);
+
+	clk_disable(ost->clk);
+	return 0;
+}
+
+static int ingenic_ost_resume(struct device *dev)
+{
+	struct ingenic_ost *ost = dev_get_drvdata(dev);
+
+	return clk_enable(ost->clk);
+}
+
+static SIMPLE_DEV_PM_OPS(ingenic_ost_pm_ops, ingenic_ost_suspend,
+			 ingenic_ost_resume);
+#define INGENIC_OST_PM_OPS (&ingenic_ost_pm_ops)
+#else
+#define INGENIC_OST_PM_OPS NULL
+#endif /* CONFIG_PM_SUSPEND */
+
+static struct platform_driver ingenic_ost_driver = {
+	.probe = ingenic_ost_probe,
+	.driver = {
+		.name	= "ingenic-ost",
+		.pm	= INGENIC_OST_PM_OPS,
+		.of_match_table = ingenic_ost_of_match,
+	},
+};
+module_platform_driver(ingenic_ost_driver);
-- 
2.11.0

[PATCH v5 07/21] MAINTAINERS: Add myself as maintainer for Ingenic TCU drivers

[Paul Cercueil]

Add myself as maintainer for the ingenic-timer and ingenic-ost drivers.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 MAINTAINERS | 9 +++++++++
 1 file changed, 9 insertions(+)

 v2: No change

 v3: No change

 v4: No change

 v5: Update with new files

diff --git a/MAINTAINERS b/MAINTAINERS
index 0fe4228f78cb..bd62185623e5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7073,6 +7073,15 @@ L:	linux-mtd@lists.infradead.org
 S:	Maintained
 F:	drivers/mtd/nand/raw/jz4780_*
 
+INGENIC TCU driver
+M:	Paul Cercueil <paul@crapouillou.net>
+S:	Maintained
+F:	drivers/clocksource/ingenic-ost.c
+F:	drivers/clocksource/ingenic-timer.c
+F:	drivers/clocksource/ingenic-timer.h
+F:	include/linux/mfd/ingenic-tcu.h
+F:	include/dt-bindings/clock/ingenic,tcu.h
+
 INOTIFY
 M:	Jan Kara <jack@suse.cz>
 R:	Amir Goldstein <amir73il@gmail.com>
-- 
2.11.0

[PATCH v5 08/21] watchdog: jz4740: Use regmap and WDT clock provided by TCU driver

[Paul Cercueil]

Instead of requesting the "ext" clock and handling the watchdog clock
divider and gating in the watchdog driver, we now request and use the
"wdt" clock that is supplied by the ingenic-timer "TCU" driver.

The major benefit is that the watchdog's clock rate and parent can now
be specified from within devicetree, instead of hardcoded in the driver.

Also, this driver won't poke anymore into the TCU registers to
enable/disable the clock, as this is now handled by the TCU driver.

On the bad side, we break the ABI with devicetree - as we now request a
different clock. In this very specific case it is still okay, as every
Ingenic JZ47xx-based board out there compile the devicetree within the
kernel; so it's still time to push breaking changes, in order to get a
clean devicetree that won't break once it musn't.

Since we broke the ABI by changing the clock, the driver was also
updated to use the regmap provided by the TCU driver.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 drivers/watchdog/Kconfig      |   2 +
 drivers/watchdog/jz4740_wdt.c | 128 +++++++++++++++++++++---------------------
 2 files changed, 66 insertions(+), 64 deletions(-)

 v5: New patch

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 9af07fd92763..834222abbbdb 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1476,7 +1476,9 @@ config INDYDOG
 config JZ4740_WDT
 	tristate "Ingenic jz4740 SoC hardware watchdog"
 	depends on MACH_JZ4740 || MACH_JZ4780
+	depends on COMMON_CLK
 	select WATCHDOG_CORE
+	select INGENIC_TIMER
 	help
 	  Hardware driver for the built-in watchdog timer on Ingenic jz4740 SoCs.
 
diff --git a/drivers/watchdog/jz4740_wdt.c b/drivers/watchdog/jz4740_wdt.c
index ec4d99a830ba..aaa6fc87136c 100644
--- a/drivers/watchdog/jz4740_wdt.c
+++ b/drivers/watchdog/jz4740_wdt.c
@@ -13,6 +13,7 @@
  *
  */
 
+#include <linux/mfd/ingenic-tcu.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/types.h>
@@ -25,26 +26,7 @@
 #include <linux/slab.h>
 #include <linux/err.h>
 #include <linux/of.h>
-
-#include <asm/mach-jz4740/timer.h>
-
-#define JZ_REG_WDT_TIMER_DATA     0x0
-#define JZ_REG_WDT_COUNTER_ENABLE 0x4
-#define JZ_REG_WDT_TIMER_COUNTER  0x8
-#define JZ_REG_WDT_TIMER_CONTROL  0xC
-
-#define JZ_WDT_CLOCK_PCLK 0x1
-#define JZ_WDT_CLOCK_RTC  0x2
-#define JZ_WDT_CLOCK_EXT  0x4
-
-#define JZ_WDT_CLOCK_DIV_SHIFT   3
-
-#define JZ_WDT_CLOCK_DIV_1    (0 << JZ_WDT_CLOCK_DIV_SHIFT)
-#define JZ_WDT_CLOCK_DIV_4    (1 << JZ_WDT_CLOCK_DIV_SHIFT)
-#define JZ_WDT_CLOCK_DIV_16   (2 << JZ_WDT_CLOCK_DIV_SHIFT)
-#define JZ_WDT_CLOCK_DIV_64   (3 << JZ_WDT_CLOCK_DIV_SHIFT)
-#define JZ_WDT_CLOCK_DIV_256  (4 << JZ_WDT_CLOCK_DIV_SHIFT)
-#define JZ_WDT_CLOCK_DIV_1024 (5 << JZ_WDT_CLOCK_DIV_SHIFT)
+#include <linux/regmap.h>
 
 #define DEFAULT_HEARTBEAT 5
 #define MAX_HEARTBEAT     2048
@@ -64,15 +46,15 @@ MODULE_PARM_DESC(heartbeat,
 
 struct jz4740_wdt_drvdata {
 	struct watchdog_device wdt;
-	void __iomem *base;
-	struct clk *rtc_clk;
+	struct regmap *map;
+	struct clk *clk;
 };
 
 static int jz4740_wdt_ping(struct watchdog_device *wdt_dev)
 {
 	struct jz4740_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
 
-	writew(0x0, drvdata->base + JZ_REG_WDT_TIMER_COUNTER);
+	regmap_write(drvdata->map, TCU_REG_WDT_TCNT, 0);
 	return 0;
 }
 
@@ -80,52 +62,65 @@ static int jz4740_wdt_set_timeout(struct watchdog_device *wdt_dev,
 				    unsigned int new_timeout)
 {
 	struct jz4740_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
-	unsigned int rtc_clk_rate;
-	unsigned int timeout_value;
-	unsigned short clock_div = JZ_WDT_CLOCK_DIV_1;
-
-	rtc_clk_rate = clk_get_rate(drvdata->rtc_clk);
-
-	timeout_value = rtc_clk_rate * new_timeout;
-	while (timeout_value > 0xffff) {
-		if (clock_div == JZ_WDT_CLOCK_DIV_1024) {
-			/* Requested timeout too high;
-			* use highest possible value. */
-			timeout_value = 0xffff;
-			break;
-		}
-		timeout_value >>= 2;
-		clock_div += (1 << JZ_WDT_CLOCK_DIV_SHIFT);
+	struct clk *clk = drvdata->clk;
+	unsigned long clk_rate, timeout_value;
+	bool change_rate = false;
+	u32 tcer;
+	int ret = 0;
+
+	clk_rate = clk_get_rate(clk);
+	timeout_value = clk_rate * new_timeout;
+
+	if (timeout_value > 0xffff) {
+		clk_rate = clk_round_rate(clk, 0xffff / new_timeout);
+		timeout_value = clk_rate * new_timeout;
+		if (timeout_value > 0xffff)
+			return -EINVAL;
+		change_rate = true;
 	}
 
-	writeb(0x0, drvdata->base + JZ_REG_WDT_COUNTER_ENABLE);
-	writew(clock_div, drvdata->base + JZ_REG_WDT_TIMER_CONTROL);
+	regmap_read(drvdata->map, TCU_REG_WDT_TCER, &tcer);
+	regmap_write(drvdata->map, TCU_REG_WDT_TCER, 0);
 
-	writew((u16)timeout_value, drvdata->base + JZ_REG_WDT_TIMER_DATA);
-	writew(0x0, drvdata->base + JZ_REG_WDT_TIMER_COUNTER);
-	writew(clock_div | JZ_WDT_CLOCK_RTC,
-		drvdata->base + JZ_REG_WDT_TIMER_CONTROL);
+	if (change_rate) {
+		clk_disable_unprepare(clk);
+		ret = clk_set_rate(clk, clk_rate);
+		clk_prepare_enable(clk);
+		if (ret)
+			goto done;
+	}
 
-	writeb(0x1, drvdata->base + JZ_REG_WDT_COUNTER_ENABLE);
+	regmap_write(drvdata->map, TCU_REG_WDT_TDR, (u16)timeout_value);
+	regmap_write(drvdata->map, TCU_REG_WDT_TCNT, 0);
 
 	wdt_dev->timeout = new_timeout;
-	return 0;
+
+done:
+	regmap_write(drvdata->map, TCU_REG_WDT_TCER, tcer & TCU_WDT_TCER_TCEN);
+	return ret;
 }
 
 static int jz4740_wdt_start(struct watchdog_device *wdt_dev)
 {
-	jz4740_timer_enable_watchdog();
-	jz4740_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
+	struct jz4740_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
+	int ret;
 
-	return 0;
+	clk_prepare_enable(drvdata->clk);
+	ret = jz4740_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
+	if (ret)
+		clk_disable_unprepare(drvdata->clk);
+	else
+		regmap_write(drvdata->map, TCU_REG_WDT_TCER, TCU_WDT_TCER_TCEN);
+
+	return ret;
 }
 
 static int jz4740_wdt_stop(struct watchdog_device *wdt_dev)
 {
 	struct jz4740_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
 
-	writeb(0x0, drvdata->base + JZ_REG_WDT_COUNTER_ENABLE);
-	jz4740_timer_disable_watchdog();
+	regmap_write(drvdata->map, TCU_REG_WDT_TCER, 0);
+	clk_disable_unprepare(drvdata->clk);
 
 	return 0;
 }
@@ -163,13 +158,17 @@ MODULE_DEVICE_TABLE(of, jz4740_wdt_of_matches);
 
 static int jz4740_wdt_probe(struct platform_device *pdev)
 {
+	struct device *dev = &pdev->dev;
 	struct jz4740_wdt_drvdata *drvdata;
 	struct watchdog_device *jz4740_wdt;
-	struct resource	*res;
 	int ret;
 
-	drvdata = devm_kzalloc(&pdev->dev, sizeof(struct jz4740_wdt_drvdata),
-			       GFP_KERNEL);
+	if (!dev->of_node) {
+		dev_err(dev, "jz4740-wdt must be probed via devicetree\n");
+		return -ENODEV;
+	}
+
+	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;
 
@@ -182,19 +181,20 @@ static int jz4740_wdt_probe(struct platform_device *pdev)
 	jz4740_wdt->timeout = heartbeat;
 	jz4740_wdt->min_timeout = 1;
 	jz4740_wdt->max_timeout = MAX_HEARTBEAT;
-	jz4740_wdt->parent = &pdev->dev;
+	jz4740_wdt->parent = dev;
 	watchdog_set_nowayout(jz4740_wdt, nowayout);
 	watchdog_set_drvdata(jz4740_wdt, drvdata);
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	drvdata->base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(drvdata->base))
-		return PTR_ERR(drvdata->base);
+	drvdata->map = dev_get_regmap(dev->parent, NULL);
+	if (IS_ERR(drvdata->map)) {
+		dev_warn(dev, "regmap not found\n");
+		return PTR_ERR(drvdata->map);
+	}
 
-	drvdata->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
-	if (IS_ERR(drvdata->rtc_clk)) {
-		dev_err(&pdev->dev, "cannot find RTC clock\n");
-		return PTR_ERR(drvdata->rtc_clk);
+	drvdata->clk = devm_clk_get(&pdev->dev, "wdt");
+	if (IS_ERR(drvdata->clk)) {
+		dev_err(&pdev->dev, "cannot find WDT clock\n");
+		return PTR_ERR(drvdata->clk);
 	}
 
 	ret = devm_watchdog_register_device(&pdev->dev, &drvdata->wdt);
-- 
2.11.0

[PATCH v5 09/21] watchdog: jz4740: Drop dependency on MACH_JZ47xx, use COMPILE_TEST

[Paul Cercueil]

Depending on MACH_JZ47xx prevent us from creating a generic kernel that
works on more than one MIPS board. Instead, we just depend on MIPS being
set.

On other architectures, this driver can still be built, thanks to
COMPILE_TEST. This is used by automated tools to find bugs, for
instance.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 drivers/watchdog/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

 v5: New patch

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 834222abbbdb..13a46cfa69b0 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1475,7 +1475,7 @@ config INDYDOG
 
 config JZ4740_WDT
 	tristate "Ingenic jz4740 SoC hardware watchdog"
-	depends on MACH_JZ4740 || MACH_JZ4780
+	depends on MIPS || COMPILE_TEST
 	depends on COMMON_CLK
 	select WATCHDOG_CORE
 	select INGENIC_TIMER
-- 
2.11.0

[PATCH v5 10/21] pwm: jz4740: Use regmap and clocks from TCU driver

[Paul Cercueil]

The ingenic-timer "TCU" driver provides us with a regmap, that we can
use to safely access the TCU registers.

It also provides us with clocks, that can be (un)gated, reparented or
reclocked from devicetree, instead of having these settings hardcoded in
this driver.

While this driver is devicetree-compatible, it is never (as of now)
probed from devicetree, so this change does not introduce a ABI problem
with current devicetree files.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 drivers/pwm/Kconfig      |   2 +
 drivers/pwm/pwm-jz4740.c | 126 +++++++++++++++++++++++++++++++----------------
 2 files changed, 86 insertions(+), 42 deletions(-)

 v5: New patch

diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index a4d262db9945..58359bf22b96 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -202,6 +202,8 @@ config PWM_IMX
 config PWM_JZ4740
 	tristate "Ingenic JZ47xx PWM support"
 	depends on MACH_INGENIC
+	depends on COMMON_CLK
+	select INGENIC_TIMER
 	help
 	  Generic PWM framework driver for Ingenic JZ47xx based
 	  machines.
diff --git a/drivers/pwm/pwm-jz4740.c b/drivers/pwm/pwm-jz4740.c
index a7b134af5e04..0fc84f0369f6 100644
--- a/drivers/pwm/pwm-jz4740.c
+++ b/drivers/pwm/pwm-jz4740.c
@@ -14,21 +14,22 @@
  */
 
 #include <linux/clk.h>
+#include <linux/clk-provider.h>
 #include <linux/err.h>
-#include <linux/gpio.h>
 #include <linux/kernel.h>
+#include <linux/mfd/ingenic-tcu.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/pwm.h>
-
-#include <asm/mach-jz4740/timer.h>
+#include <linux/regmap.h>
 
 #define NUM_PWM 8
 
 struct jz4740_pwm_chip {
 	struct pwm_chip chip;
-	struct clk *clk;
+	struct clk *clks[NUM_PWM];
+	struct regmap *map;
 };
 
 static inline struct jz4740_pwm_chip *to_jz4740(struct pwm_chip *chip)
@@ -38,6 +39,11 @@ static inline struct jz4740_pwm_chip *to_jz4740(struct pwm_chip *chip)
 
 static int jz4740_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
 {
+	struct jz4740_pwm_chip *jz = to_jz4740(chip);
+	struct clk *clk;
+	char clk_name[16];
+	int ret;
+
 	/*
 	 * Timers 0 and 1 are used for system tasks, so they are unavailable
 	 * for use as PWMs.
@@ -45,65 +51,89 @@ static int jz4740_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
 	if (pwm->hwpwm < 2)
 		return -EBUSY;
 
-	jz4740_timer_start(pwm->hwpwm);
+	snprintf(clk_name, sizeof(clk_name), "timer%u", pwm->hwpwm);
 
+	clk = clk_get(chip->dev, clk_name);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	ret = clk_prepare_enable(clk);
+	if (ret) {
+		clk_put(clk);
+		return ret;
+	}
+
+	jz->clks[pwm->hwpwm] = clk;
 	return 0;
 }
 
 static void jz4740_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
 {
-	jz4740_timer_set_ctrl(pwm->hwpwm, 0);
+	struct jz4740_pwm_chip *jz = to_jz4740(chip);
+	struct clk *clk = jz->clks[pwm->hwpwm];
 
-	jz4740_timer_stop(pwm->hwpwm);
+	clk_disable_unprepare(clk);
+	clk_put(clk);
 }
 
 static int jz4740_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 {
-	uint32_t ctrl = jz4740_timer_get_ctrl(pwm->pwm);
+	struct jz4740_pwm_chip *jz = to_jz4740(chip);
 
-	ctrl |= JZ_TIMER_CTRL_PWM_ENABLE;
-	jz4740_timer_set_ctrl(pwm->hwpwm, ctrl);
-	jz4740_timer_enable(pwm->hwpwm);
+	/* Enable PWM output */
+	regmap_update_bits(jz->map, TCU_REG_TCSRc(pwm->hwpwm),
+				TCU_TCSR_PWM_EN, TCU_TCSR_PWM_EN);
 
+	/* Start counter */
+	regmap_write(jz->map, TCU_REG_TESR, BIT(pwm->hwpwm));
 	return 0;
 }
 
 static void jz4740_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
 {
-	uint32_t ctrl = jz4740_timer_get_ctrl(pwm->hwpwm);
+	struct jz4740_pwm_chip *jz = to_jz4740(chip);
 
 	/* Disable PWM output.
 	 * In TCU2 mode (channel 1/2 on JZ4750+), this must be done before the
 	 * counter is stopped, while in TCU1 mode the order does not matter.
 	 */
-	ctrl &= ~JZ_TIMER_CTRL_PWM_ENABLE;
-	jz4740_timer_set_ctrl(pwm->hwpwm, ctrl);
+	regmap_update_bits(jz->map, TCU_REG_TCSRc(pwm->hwpwm),
+				TCU_TCSR_PWM_EN, 0);
 
 	/* Stop counter */
-	jz4740_timer_disable(pwm->hwpwm);
+	regmap_write(jz->map, TCU_REG_TECR, BIT(pwm->hwpwm));
 }
 
 static int jz4740_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 			     int duty_ns, int period_ns)
 {
 	struct jz4740_pwm_chip *jz4740 = to_jz4740(pwm->chip);
+	struct clk *clk = jz4740->clks[pwm->hwpwm];
+	unsigned long rate, new_rate, period, duty;
 	unsigned long long tmp;
-	unsigned long period, duty;
-	unsigned int prescaler = 0;
-	uint16_t ctrl;
+	unsigned int tcsr;
 	bool is_enabled;
 
-	tmp = (unsigned long long)clk_get_rate(jz4740->clk) * period_ns;
-	do_div(tmp, 1000000000);
-	period = tmp;
+	rate = clk_get_rate(clk);
 
-	while (period > 0xffff && prescaler < 6) {
-		period >>= 2;
-		++prescaler;
+	for (;;) {
+		tmp = (unsigned long long) rate * period_ns;
+		do_div(tmp, 1000000000);
+
+		if (tmp <= 0xffff)
+			break;
+
+		new_rate = clk_round_rate(clk, rate / 2);
+
+		if (new_rate < rate)
+			rate = new_rate;
+		else
+			return -EINVAL;
 	}
 
-	if (prescaler == 6)
-		return -EINVAL;
+	clk_set_rate(clk, rate);
+
+	period = tmp;
 
 	tmp = (unsigned long long)period * duty_ns;
 	do_div(tmp, period_ns);
@@ -112,18 +142,23 @@ static int jz4740_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	if (duty >= period)
 		duty = period - 1;
 
-	is_enabled = jz4740_timer_is_enabled(pwm->hwpwm);
+	regmap_read(jz4740->map, TCU_REG_TER, &tcsr);
+	is_enabled = tcsr & BIT(pwm->hwpwm);
 	if (is_enabled)
 		jz4740_pwm_disable(chip, pwm);
 
-	jz4740_timer_set_count(pwm->hwpwm, 0);
-	jz4740_timer_set_duty(pwm->hwpwm, duty);
-	jz4740_timer_set_period(pwm->hwpwm, period);
+	/* Set abrupt shutdown */
+	regmap_update_bits(jz4740->map, TCU_REG_TCSRc(pwm->hwpwm),
+				TCU_TCSR_PWM_SD, TCU_TCSR_PWM_SD);
+
+	/* Reset counter to 0 */
+	regmap_write(jz4740->map, TCU_REG_TCNTc(pwm->hwpwm), 0);
 
-	ctrl = JZ_TIMER_CTRL_PRESCALER(prescaler) | JZ_TIMER_CTRL_SRC_EXT |
-		JZ_TIMER_CTRL_PWM_ABBRUPT_SHUTDOWN;
+	/* Set duty */
+	regmap_write(jz4740->map, TCU_REG_TDHRc(pwm->hwpwm), duty);
 
-	jz4740_timer_set_ctrl(pwm->hwpwm, ctrl);
+	/* Set period */
+	regmap_write(jz4740->map, TCU_REG_TDFRc(pwm->hwpwm), period);
 
 	if (is_enabled)
 		jz4740_pwm_enable(chip, pwm);
@@ -134,18 +169,19 @@ static int jz4740_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 static int jz4740_pwm_set_polarity(struct pwm_chip *chip,
 		struct pwm_device *pwm, enum pwm_polarity polarity)
 {
-	uint32_t ctrl = jz4740_timer_get_ctrl(pwm->pwm);
+	struct jz4740_pwm_chip *jz = to_jz4740(chip);
 
 	switch (polarity) {
 	case PWM_POLARITY_NORMAL:
-		ctrl &= ~JZ_TIMER_CTRL_PWM_ACTIVE_LOW;
+		regmap_update_bits(jz->map, TCU_REG_TCSRc(pwm->hwpwm),
+				TCU_TCSR_PWM_INITL_HIGH, 0);
 		break;
 	case PWM_POLARITY_INVERSED:
-		ctrl |= JZ_TIMER_CTRL_PWM_ACTIVE_LOW;
+		regmap_update_bits(jz->map, TCU_REG_TCSRc(pwm->hwpwm),
+			TCU_TCSR_PWM_INITL_HIGH, TCU_TCSR_PWM_INITL_HIGH);
 		break;
 	}
 
-	jz4740_timer_set_ctrl(pwm->hwpwm, ctrl);
 	return 0;
 }
 
@@ -162,16 +198,22 @@ static const struct pwm_ops jz4740_pwm_ops = {
 static int jz4740_pwm_probe(struct platform_device *pdev)
 {
 	struct jz4740_pwm_chip *jz4740;
+	struct device *dev = &pdev->dev;
+
+	if (!dev->of_node) {
+		dev_err(dev, "jz4740-pwm must be probed via devicetree\n");
+		return -ENODEV;
+	}
 
-	jz4740 = devm_kzalloc(&pdev->dev, sizeof(*jz4740), GFP_KERNEL);
+	jz4740 = devm_kzalloc(dev, sizeof(*jz4740), GFP_KERNEL);
 	if (!jz4740)
 		return -ENOMEM;
 
-	jz4740->clk = devm_clk_get(&pdev->dev, "ext");
-	if (IS_ERR(jz4740->clk))
-		return PTR_ERR(jz4740->clk);
+	jz4740->map = dev_get_regmap(dev->parent, NULL);
+	if (IS_ERR(jz4740->map))
+		return PTR_ERR(jz4740->map);
 
-	jz4740->chip.dev = &pdev->dev;
+	jz4740->chip.dev = dev;
 	jz4740->chip.ops = &jz4740_pwm_ops;
 	jz4740->chip.npwm = NUM_PWM;
 	jz4740->chip.base = -1;
-- 
2.11.0

[PATCH v5 11/21] pwm: jz4740: Drop dependency on MACH_INGENIC, use COMPILE_TEST

[Paul Cercueil]

Depending on MACH_INGENIC prevent us from creating a generic kernel that
works on more than one MIPS board. Instead, we just depend on MIPS being
set.

On other architectures, this driver can still be built, thanks to
COMPILE_TEST. This is used by automated tools to find bugs, for
instance.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 drivers/pwm/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

 v5: New patch

diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index 58359bf22b96..e53ad662ef87 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -201,7 +201,7 @@ config PWM_IMX
 
 config PWM_JZ4740
 	tristate "Ingenic JZ47xx PWM support"
-	depends on MACH_INGENIC
+	depends on MIPS || COMPILE_TEST
 	depends on COMMON_CLK
 	select INGENIC_TIMER
 	help
-- 
2.11.0

[PATCH v5 12/21] pwm: jz4740: Remove unused devicetree compatible strings

[Paul Cercueil]

Right now none of the Ingenic-based boards probe this driver from
devicetree. This driver defined three compatible strings for the exact
same behaviour. Before these strings are used, we can remove two of
them.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 drivers/pwm/pwm-jz4740.c | 2 --
 1 file changed, 2 deletions(-)

 v5: New patch

diff --git a/drivers/pwm/pwm-jz4740.c b/drivers/pwm/pwm-jz4740.c
index 0fc84f0369f6..e1cb618bb234 100644
--- a/drivers/pwm/pwm-jz4740.c
+++ b/drivers/pwm/pwm-jz4740.c
@@ -235,8 +235,6 @@ static int jz4740_pwm_remove(struct platform_device *pdev)
 #ifdef CONFIG_OF
 static const struct of_device_id jz4740_pwm_dt_ids[] = {
 	{ .compatible = "ingenic,jz4740-pwm", },
-	{ .compatible = "ingenic,jz4770-pwm", },
-	{ .compatible = "ingenic,jz4780-pwm", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, jz4740_pwm_dt_ids);
-- 
2.11.0

[PATCH v5 13/21] pwm: jz4740: Add support for the JZ4725B

[Paul Cercueil]

The PWM in the JZ4725B works the same as in the JZ4740, except that it
only has 6 channels available instead of 8.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 drivers/pwm/pwm-jz4740.c | 34 +++++++++++++++++++++++++---------
 1 file changed, 25 insertions(+), 9 deletions(-)

 v5: New patch

diff --git a/drivers/pwm/pwm-jz4740.c b/drivers/pwm/pwm-jz4740.c
index e1cb618bb234..b19437c75232 100644
--- a/drivers/pwm/pwm-jz4740.c
+++ b/drivers/pwm/pwm-jz4740.c
@@ -26,6 +26,10 @@
 
 #define NUM_PWM 8
 
+struct jz4740_soc_info {
+	unsigned int num_pwms;
+};
+
 struct jz4740_pwm_chip {
 	struct pwm_chip chip;
 	struct clk *clks[NUM_PWM];
@@ -195,8 +199,26 @@ static const struct pwm_ops jz4740_pwm_ops = {
 	.owner = THIS_MODULE,
 };
 
+static const struct jz4740_soc_info jz4740_soc_info = {
+	.num_pwms = 8,
+};
+
+static const struct jz4740_soc_info jz4725b_soc_info = {
+	.num_pwms = 6,
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id jz4740_pwm_dt_ids[] = {
+	{ .compatible = "ingenic,jz4740-pwm", .data = &jz4740_soc_info },
+	{ .compatible = "ingenic,jz4725b-pwm", .data = &jz4725b_soc_info },
+	{},
+};
+MODULE_DEVICE_TABLE(of, jz4740_pwm_dt_ids);
+#endif
+
 static int jz4740_pwm_probe(struct platform_device *pdev)
 {
+	const struct jz4740_soc_info *soc_info;
 	struct jz4740_pwm_chip *jz4740;
 	struct device *dev = &pdev->dev;
 
@@ -213,9 +235,11 @@ static int jz4740_pwm_probe(struct platform_device *pdev)
 	if (IS_ERR(jz4740->map))
 		return PTR_ERR(jz4740->map);
 
+	soc_info = of_device_get_match_data(dev);
+
 	jz4740->chip.dev = dev;
 	jz4740->chip.ops = &jz4740_pwm_ops;
-	jz4740->chip.npwm = NUM_PWM;
+	jz4740->chip.npwm = soc_info->num_pwms;
 	jz4740->chip.base = -1;
 	jz4740->chip.of_xlate = of_pwm_xlate_with_flags;
 	jz4740->chip.of_pwm_n_cells = 3;
@@ -232,14 +256,6 @@ static int jz4740_pwm_remove(struct platform_device *pdev)
 	return pwmchip_remove(&jz4740->chip);
 }
 
-#ifdef CONFIG_OF
-static const struct of_device_id jz4740_pwm_dt_ids[] = {
-	{ .compatible = "ingenic,jz4740-pwm", },
-	{},
-};
-MODULE_DEVICE_TABLE(of, jz4740_pwm_dt_ids);
-#endif
-
 static struct platform_driver jz4740_pwm_driver = {
 	.driver = {
 		.name = "jz4740-pwm",
-- 
2.11.0

[PATCH v5 14/21] clk: jz4740: Add TCU clock

[Paul Cercueil]

Add the missing TCU clock to the list of clocks supplied by the CGU for
the JZ4740 SoC.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 drivers/clk/ingenic/jz4740-cgu.c       | 6 ++++++
 include/dt-bindings/clock/jz4740-cgu.h | 1 +
 2 files changed, 7 insertions(+)

 v5: New patch

diff --git a/drivers/clk/ingenic/jz4740-cgu.c b/drivers/clk/ingenic/jz4740-cgu.c
index 32fcc75f6f77..216ba051e743 100644
--- a/drivers/clk/ingenic/jz4740-cgu.c
+++ b/drivers/clk/ingenic/jz4740-cgu.c
@@ -211,6 +211,12 @@ static const struct ingenic_cgu_clk_info jz4740_cgu_clocks[] = {
 		.parents = { JZ4740_CLK_EXT, -1, -1, -1 },
 		.gate = { CGU_REG_CLKGR, 5 },
 	},
+
+	[JZ4740_CLK_TCU] = {
+		"tcu", CGU_CLK_GATE,
+		.parents = { JZ4740_CLK_EXT, -1, -1, -1 },
+		.gate = { CGU_REG_CLKGR, 1 },
+	},
 };
 
 static void __init jz4740_cgu_init(struct device_node *np)
diff --git a/include/dt-bindings/clock/jz4740-cgu.h b/include/dt-bindings/clock/jz4740-cgu.h
index 6ed83f926ae7..e82d77028581 100644
--- a/include/dt-bindings/clock/jz4740-cgu.h
+++ b/include/dt-bindings/clock/jz4740-cgu.h
@@ -34,5 +34,6 @@
 #define JZ4740_CLK_ADC		19
 #define JZ4740_CLK_I2C		20
 #define JZ4740_CLK_AIC		21
+#define JZ4740_CLK_TCU		22
 
 #endif /* __DT_BINDINGS_CLOCK_JZ4740_CGU_H__ */
-- 
2.11.0

[PATCH v5 15/21] MIPS: Kconfig: Select TCU timer driver when MACH_INGENIC is set

[Paul Cercueil]

We cannot boot to userspace (not even initramfs) if the timer driver is
not present; so it makes sense to enable it unconditionally when
MACH_INGENIC is set.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 arch/mips/Kconfig | 1 +
 1 file changed, 1 insertion(+)

 v5: New patch

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 08c10c518f83..254dbf69a4ad 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -384,6 +384,7 @@ config MACH_INGENIC
 	select BUILTIN_DTB
 	select USE_OF
 	select LIBFDT
+	select INGENIC_TIMER
 
 config LANTIQ
 	bool "Lantiq based platforms"
-- 
2.11.0

[PATCH v5 16/21] MIPS: jz4740: Add DTS nodes for the TCU drivers

[Paul Cercueil]

Add DTS nodes for the JZ4780, JZ4770 and JZ4740 devicetree files.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 arch/mips/boot/dts/ingenic/jz4740.dtsi | 51 +++++++++++++++++++++++---
 arch/mips/boot/dts/ingenic/jz4770.dtsi | 59 ++++++++++++++++++++++++++++++
 arch/mips/boot/dts/ingenic/jz4780.dtsi | 67 ++++++++++++++++++++++++++++++----
 3 files changed, 164 insertions(+), 13 deletions(-)

 v5: New patch

diff --git a/arch/mips/boot/dts/ingenic/jz4740.dtsi b/arch/mips/boot/dts/ingenic/jz4740.dtsi
index 26c6b561d6f7..85ba63d9dc9c 100644
--- a/arch/mips/boot/dts/ingenic/jz4740.dtsi
+++ b/arch/mips/boot/dts/ingenic/jz4740.dtsi
@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <dt-bindings/clock/jz4740-cgu.h>
+#include <dt-bindings/clock/ingenic,tcu.h>
 
 / {
 	#address-cells = <1>;
@@ -45,12 +46,52 @@
 		#clock-cells = <1>;
 	};
 
-	watchdog: watchdog@10002000 {
-		compatible = "ingenic,jz4740-watchdog";
-		reg = <0x10002000 0x10>;
+	tcu: timer@10002000 {
+		compatible = "ingenic,jz4740-tcu";
+		reg = <0x10002000 0x1000>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0x0 0x10002000 0x1000>;
 
-		clocks = <&cgu JZ4740_CLK_RTC>;
-		clock-names = "rtc";
+		#clock-cells = <1>;
+
+		clocks = <&cgu JZ4740_CLK_RTC
+			  &cgu JZ4740_CLK_EXT
+			  &cgu JZ4740_CLK_PCLK
+			  &cgu JZ4740_CLK_TCU>;
+		clock-names = "rtc", "ext", "pclk", "tcu";
+
+		interrupt-controller;
+		#interrupt-cells = <1>;
+
+		interrupt-parent = <&intc>;
+		interrupts = <23 22 21>;
+
+		watchdog: watchdog@0 {
+			compatible = "ingenic,jz4740-watchdog";
+			reg = <0x0 0x10>;
+
+			clocks = <&tcu TCU_CLK_WDT>;
+			clock-names = "wdt";
+		};
+
+		pwm: pwm@10 {
+			compatible = "ingenic,jz4740-pwm";
+			reg = <0x10 0xff0>;
+
+			#pwm-cells = <3>;
+
+			clocks = <&tcu TCU_CLK_TIMER0
+				  &tcu TCU_CLK_TIMER1
+				  &tcu TCU_CLK_TIMER2
+				  &tcu TCU_CLK_TIMER3
+				  &tcu TCU_CLK_TIMER4
+				  &tcu TCU_CLK_TIMER5
+				  &tcu TCU_CLK_TIMER6
+				  &tcu TCU_CLK_TIMER7>;
+			clock-names = "timer0", "timer1", "timer2", "timer3",
+				      "timer4", "timer5", "timer6", "timer7";
+		};
 	};
 
 	rtc_dev: rtc@10003000 {
diff --git a/arch/mips/boot/dts/ingenic/jz4770.dtsi b/arch/mips/boot/dts/ingenic/jz4770.dtsi
index 7c2804f3f5f1..1c1a91ad163b 100644
--- a/arch/mips/boot/dts/ingenic/jz4770.dtsi
+++ b/arch/mips/boot/dts/ingenic/jz4770.dtsi
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 
 #include <dt-bindings/clock/jz4770-cgu.h>
+#include <dt-bindings/clock/ingenic,tcu.h>
 
 / {
 	#address-cells = <1>;
@@ -46,6 +47,64 @@
 		#clock-cells = <1>;
 	};
 
+	tcu: timer@10002000 {
+		compatible = "ingenic,jz4770-tcu";
+		reg = <0x10002000 0x1000>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0x0 0x10002000 0x1000>;
+
+		#clock-cells = <1>;
+
+		clocks = <&cgu JZ4770_CLK_RTC
+			  &cgu JZ4770_CLK_EXT
+			  &cgu JZ4770_CLK_PCLK
+			  &cgu JZ4770_CLK_EXT>;
+		clock-names = "rtc", "ext", "pclk", "tcu";
+
+		interrupt-controller;
+		#interrupt-cells = <1>;
+
+		interrupt-parent = <&intc>;
+		interrupts = <27 26 25>;
+
+		watchdog: watchdog@0 {
+			compatible = "ingenic,jz4740-watchdog";
+			reg = <0x0 0x10>;
+
+			clocks = <&tcu TCU_CLK_WDT>;
+			clock-names = "wdt";
+		};
+
+		pwm: pwm@10 {
+			compatible = "ingenic,jz4740-pwm";
+			reg = <0x10 0xff0>;
+
+			#pwm-cells = <3>;
+
+			clocks = <&tcu TCU_CLK_TIMER0
+				  &tcu TCU_CLK_TIMER1
+				  &tcu TCU_CLK_TIMER2
+				  &tcu TCU_CLK_TIMER3
+				  &tcu TCU_CLK_TIMER4
+				  &tcu TCU_CLK_TIMER5
+				  &tcu TCU_CLK_TIMER6
+				  &tcu TCU_CLK_TIMER7>;
+			clock-names = "timer0", "timer1", "timer2", "timer3",
+				      "timer4", "timer5", "timer6", "timer7";
+		};
+
+		ost: timer@e0 {
+			compatible = "ingenic,jz4770-ost";
+			reg = <0xe0 0x20>;
+
+			clocks = <&tcu TCU_CLK_OST>;
+			clock-names = "ost";
+
+			interrupts = <15>;
+		};
+	};
+
 	pinctrl: pin-controller@10010000 {
 		compatible = "ingenic,jz4770-pinctrl";
 		reg = <0x10010000 0x600>;
diff --git a/arch/mips/boot/dts/ingenic/jz4780.dtsi b/arch/mips/boot/dts/ingenic/jz4780.dtsi
index aa4e8f75ff5d..b39fd13229d9 100644
--- a/arch/mips/boot/dts/ingenic/jz4780.dtsi
+++ b/arch/mips/boot/dts/ingenic/jz4780.dtsi
@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <dt-bindings/clock/jz4780-cgu.h>
+#include <dt-bindings/clock/ingenic,tcu.h>
 #include <dt-bindings/dma/jz4780-dma.h>
 
 / {
@@ -46,6 +47,64 @@
 		#clock-cells = <1>;
 	};
 
+	tcu: timer@10002000 {
+		compatible = "ingenic,jz4770-tcu";
+		reg = <0x10002000 0x1000>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0x0 0x10002000 0x1000>;
+
+		#clock-cells = <1>;
+
+		clocks = <&cgu JZ4780_CLK_RTCLK
+			  &cgu JZ4780_CLK_EXCLK
+			  &cgu JZ4780_CLK_PCLK
+			  &cgu JZ4780_CLK_EXCLK>;
+		clock-names = "rtc", "ext", "pclk", "tcu";
+
+		interrupt-controller;
+		#interrupt-cells = <1>;
+
+		interrupt-parent = <&intc>;
+		interrupts = <27 26 25>;
+
+		watchdog: watchdog@0 {
+			compatible = "ingenic,jz4780-watchdog";
+			reg = <0x0 0x10>;
+
+			clocks = <&tcu TCU_CLK_WDT>;
+			clock-names = "wdt";
+		};
+
+		pwm: pwm@10 {
+			compatible = "ingenic,jz4740-pwm";
+			reg = <0x10 0xff0>;
+
+			#pwm-cells = <3>;
+
+			clocks = <&tcu TCU_CLK_TIMER0
+				  &tcu TCU_CLK_TIMER1
+				  &tcu TCU_CLK_TIMER2
+				  &tcu TCU_CLK_TIMER3
+				  &tcu TCU_CLK_TIMER4
+				  &tcu TCU_CLK_TIMER5
+				  &tcu TCU_CLK_TIMER6
+				  &tcu TCU_CLK_TIMER7>;
+			clock-names = "timer0", "timer1", "timer2", "timer3",
+				      "timer4", "timer5", "timer6", "timer7";
+		};
+
+		ost: timer@e0 {
+			compatible = "ingenic,jz4770-ost";
+			reg = <0xe0 0x20>;
+
+			clocks = <&tcu TCU_CLK_OST>;
+			clock-names = "ost";
+
+			interrupts = <15>;
+		};
+	};
+
 	rtc_dev: rtc@10003000 {
 		compatible = "ingenic,jz4780-rtc";
 		reg = <0x10003000 0x4c>;
@@ -220,14 +279,6 @@
 		status = "disabled";
 	};
 
-	watchdog: watchdog@10002000 {
-		compatible = "ingenic,jz4780-watchdog";
-		reg = <0x10002000 0x10>;
-
-		clocks = <&cgu JZ4780_CLK_RTCLK>;
-		clock-names = "rtc";
-	};
-
 	nemc: nemc@13410000 {
 		compatible = "ingenic,jz4780-nemc";
 		reg = <0x13410000 0x10000>;
-- 
2.11.0

[PATCH v5 17/21] MIPS: qi_lb60: Move PWM devices to devicetree

[Paul Cercueil]

Probe the few drivers using PWMs from devicetree, now that we have a
devicetree node for the PWM driver.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 arch/mips/boot/dts/ingenic/qi_lb60.dts | 14 ++++++++++++++
 arch/mips/jz4740/board-qi_lb60.c       | 19 -------------------
 2 files changed, 14 insertions(+), 19 deletions(-)

 v5: New patch

diff --git a/arch/mips/boot/dts/ingenic/qi_lb60.dts b/arch/mips/boot/dts/ingenic/qi_lb60.dts
index 76aaf8982554..85529a142409 100644
--- a/arch/mips/boot/dts/ingenic/qi_lb60.dts
+++ b/arch/mips/boot/dts/ingenic/qi_lb60.dts
@@ -9,6 +9,14 @@
 	chosen {
 		stdout-path = &uart0;
 	};
+
+	beeper {
+		compatible = "pwm-beeper";
+		pwms = <&pwm 4 0 0>;
+
+		pinctrl-names = "default";
+		pinctrl-0 = <&pins_pwm4>;
+	};
 };
 
 &ext {
@@ -30,4 +38,10 @@
 		groups = "uart0-data";
 		bias-disable;
 	};
+
+	pins_pwm4: pwm4 {
+		function = "pwm4";
+		groups = "pwm4";
+		bias-disable;
+	};
 };
diff --git a/arch/mips/jz4740/board-qi_lb60.c b/arch/mips/jz4740/board-qi_lb60.c
index 60f0767507c6..2db32cb9ed47 100644
--- a/arch/mips/jz4740/board-qi_lb60.c
+++ b/arch/mips/jz4740/board-qi_lb60.c
@@ -27,7 +27,6 @@
 #include <linux/power_supply.h>
 #include <linux/power/jz4740-battery.h>
 #include <linux/power/gpio-charger.h>
-#include <linux/pwm.h>
 
 #include <asm/mach-jz4740/gpio.h>
 #include <asm/mach-jz4740/jz4740_fb.h>
@@ -391,17 +390,6 @@ static struct jz4740_mmc_platform_data qi_lb60_mmc_pdata = {
 	.power_active_low	= 1,
 };
 
-/* beeper */
-static struct pwm_lookup qi_lb60_pwm_lookup[] = {
-	PWM_LOOKUP("jz4740-pwm", 4, "pwm-beeper", NULL, 0,
-		   PWM_POLARITY_NORMAL),
-};
-
-static struct platform_device qi_lb60_pwm_beeper = {
-	.name = "pwm-beeper",
-	.id = -1,
-};
-
 /* charger */
 static char *qi_lb60_batteries[] = {
 	"battery",
@@ -450,10 +438,8 @@ static struct platform_device *jz_platform_devices[] __initdata = {
 	&jz4740_i2s_device,
 	&jz4740_codec_device,
 	&jz4740_adc_device,
-	&jz4740_pwm_device,
 	&jz4740_dma_device,
 	&qi_lb60_gpio_keys,
-	&qi_lb60_pwm_beeper,
 	&qi_lb60_charger_device,
 	&qi_lb60_audio_device,
 };
@@ -482,10 +468,6 @@ static struct pinctrl_map pin_map[] __initdata = {
 			"10010000.jz4740-pinctrl", "PD0", pin_cfg_bias_disable),
 	PIN_MAP_CONFIGS_PIN_DEFAULT("jz4740-mmc.0",
 			"10010000.jz4740-pinctrl", "PD2", pin_cfg_bias_disable),
-
-	/* PWM pin configuration */
-	PIN_MAP_MUX_GROUP_DEFAULT("jz4740-pwm",
-			"10010000.jz4740-pinctrl", "pwm4", "pwm4"),
 };
 
 
@@ -503,7 +485,6 @@ static int __init qi_lb60_init_platform_devices(void)
 	spi_register_board_info(qi_lb60_spi_board_info,
 				ARRAY_SIZE(qi_lb60_spi_board_info));
 
-	pwm_add_table(qi_lb60_pwm_lookup, ARRAY_SIZE(qi_lb60_pwm_lookup));
 	pinctrl_register_mappings(pin_map, ARRAY_SIZE(pin_map));
 
 	return platform_add_devices(jz_platform_devices,
-- 
2.11.0

[PATCH v5 18/21] MIPS: qi_lb60: Use 750 kHz system timer & enable clocksource

[Paul Cercueil]

The default clock (12 MHz) is too fast for the system timer, which fails
to report time accurately.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 arch/mips/boot/dts/ingenic/qi_lb60.dts | 9 +++++++++
 1 file changed, 9 insertions(+)

 v5: New patch

diff --git a/arch/mips/boot/dts/ingenic/qi_lb60.dts b/arch/mips/boot/dts/ingenic/qi_lb60.dts
index 85529a142409..5d2aca867427 100644
--- a/arch/mips/boot/dts/ingenic/qi_lb60.dts
+++ b/arch/mips/boot/dts/ingenic/qi_lb60.dts
@@ -45,3 +45,12 @@
 		bias-disable;
 	};
 };
+
+&tcu {
+	/* Use TCU1 channel as clocksource */
+	ingenic,clocksource-channel = <1>;
+
+	/* 750 kHz for the system timer and clocksource */
+	assigned-clocks = <&tcu TCU_CLK_TIMER0>, <&tcu TCU_CLK_TIMER1>;
+	assigned-clock-rates = <750000>, <750000>;
+};
-- 
2.11.0

[PATCH v5 19/21] MIPS: CI20: Reduce system timer clock to 3 MHz

[Paul Cercueil]

The default clock (48 MHz) is too fast for the system timer, which fails
to report time accurately.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 arch/mips/boot/dts/ingenic/ci20.dts | 6 ++++++
 1 file changed, 6 insertions(+)

 v5: New patch

diff --git a/arch/mips/boot/dts/ingenic/ci20.dts b/arch/mips/boot/dts/ingenic/ci20.dts
index 50cff3cbcc6d..700cf28a52ec 100644
--- a/arch/mips/boot/dts/ingenic/ci20.dts
+++ b/arch/mips/boot/dts/ingenic/ci20.dts
@@ -238,3 +238,9 @@
 		bias-disable;
 	};
 };
+
+&tcu {
+	/* 3 MHz for the system timer */
+	assigned-clocks = <&tcu TCU_CLK_TIMER0>;
+	assigned-clock-rates = <3000000>;
+};
-- 
2.11.0

[PATCH v5 20/21] MIPS: CI20: defconfig: enable OST driver

[Paul Cercueil]

The OST driver provides a clocksource and sched_clock that are much more
accurate than the default ones.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 arch/mips/configs/ci20_defconfig | 1 +
 1 file changed, 1 insertion(+)

 v5: New patch

diff --git a/arch/mips/configs/ci20_defconfig b/arch/mips/configs/ci20_defconfig
index be23fd25eeaa..e56dc5c024b9 100644
--- a/arch/mips/configs/ci20_defconfig
+++ b/arch/mips/configs/ci20_defconfig
@@ -109,6 +109,7 @@ CONFIG_RTC_CLASS=y
 CONFIG_RTC_DRV_JZ4740=y
 CONFIG_DMADEVICES=y
 CONFIG_DMA_JZ4780=y
+CONFIG_INGENIC_OST=y
 # CONFIG_IOMMU_SUPPORT is not set
 CONFIG_MEMORY=y
 CONFIG_EXT4_FS=y
-- 
2.11.0

[PATCH v5 21/21] MIPS: jz4740: Drop obsolete code

[Paul Cercueil]

The old clocksource/timer platform code is now obsoleted by the newly
introduced ingenic-timer and ingenic-ost drivers.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 arch/mips/include/asm/mach-jz4740/platform.h |   1 -
 arch/mips/include/asm/mach-jz4740/timer.h    | 135 --------------------
 arch/mips/jz4740/Makefile                    |   3 +-
 arch/mips/jz4740/platform.c                  |   6 -
 arch/mips/jz4740/setup.c                     |   8 ++
 arch/mips/jz4740/time.c                      | 176 ---------------------------
 arch/mips/jz4740/timer.c                     |  51 --------
 7 files changed, 9 insertions(+), 371 deletions(-)
 delete mode 100644 arch/mips/include/asm/mach-jz4740/timer.h
 delete mode 100644 arch/mips/jz4740/time.c
 delete mode 100644 arch/mips/jz4740/timer.c

 v5: New patch

diff --git a/arch/mips/include/asm/mach-jz4740/platform.h b/arch/mips/include/asm/mach-jz4740/platform.h
index c0c932ac72a7..cd464d956882 100644
--- a/arch/mips/include/asm/mach-jz4740/platform.h
+++ b/arch/mips/include/asm/mach-jz4740/platform.h
@@ -29,7 +29,6 @@ extern struct platform_device jz4740_i2s_device;
 extern struct platform_device jz4740_pcm_device;
 extern struct platform_device jz4740_codec_device;
 extern struct platform_device jz4740_adc_device;
-extern struct platform_device jz4740_pwm_device;
 extern struct platform_device jz4740_dma_device;
 
 #endif
diff --git a/arch/mips/include/asm/mach-jz4740/timer.h b/arch/mips/include/asm/mach-jz4740/timer.h
deleted file mode 100644
index 8750a1d04e22..000000000000
--- a/arch/mips/include/asm/mach-jz4740/timer.h
+++ /dev/null
@@ -1,135 +0,0 @@
-/*
- *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
- *  JZ4740 platform timer support
- *
- *  This program is free software; you can redistribute it and/or modify it
- *  under  the terms of the GNU General	 Public License as published by the
- *  Free Software Foundation;  either version 2 of the License, or (at your
- *  option) any later version.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  675 Mass Ave, Cambridge, MA 02139, USA.
- *
- */
-
-#ifndef __ASM_MACH_JZ4740_TIMER
-#define __ASM_MACH_JZ4740_TIMER
-
-#define JZ_REG_TIMER_STOP		0x0C
-#define JZ_REG_TIMER_STOP_SET		0x1C
-#define JZ_REG_TIMER_STOP_CLEAR		0x2C
-#define JZ_REG_TIMER_ENABLE		0x00
-#define JZ_REG_TIMER_ENABLE_SET		0x04
-#define JZ_REG_TIMER_ENABLE_CLEAR	0x08
-#define JZ_REG_TIMER_FLAG		0x10
-#define JZ_REG_TIMER_FLAG_SET		0x14
-#define JZ_REG_TIMER_FLAG_CLEAR		0x18
-#define JZ_REG_TIMER_MASK		0x20
-#define JZ_REG_TIMER_MASK_SET		0x24
-#define JZ_REG_TIMER_MASK_CLEAR		0x28
-
-#define JZ_REG_TIMER_DFR(x) (((x) * 0x10) + 0x30)
-#define JZ_REG_TIMER_DHR(x) (((x) * 0x10) + 0x34)
-#define JZ_REG_TIMER_CNT(x) (((x) * 0x10) + 0x38)
-#define JZ_REG_TIMER_CTRL(x) (((x) * 0x10) + 0x3C)
-
-#define JZ_TIMER_IRQ_HALF(x) BIT((x) + 0x10)
-#define JZ_TIMER_IRQ_FULL(x) BIT(x)
-
-#define JZ_TIMER_CTRL_PWM_ABBRUPT_SHUTDOWN	BIT(9)
-#define JZ_TIMER_CTRL_PWM_ACTIVE_LOW		BIT(8)
-#define JZ_TIMER_CTRL_PWM_ENABLE		BIT(7)
-#define JZ_TIMER_CTRL_PRESCALE_MASK		0x1c
-#define JZ_TIMER_CTRL_PRESCALE_OFFSET		0x3
-#define JZ_TIMER_CTRL_PRESCALE_1		(0 << 3)
-#define JZ_TIMER_CTRL_PRESCALE_4		(1 << 3)
-#define JZ_TIMER_CTRL_PRESCALE_16		(2 << 3)
-#define JZ_TIMER_CTRL_PRESCALE_64		(3 << 3)
-#define JZ_TIMER_CTRL_PRESCALE_256		(4 << 3)
-#define JZ_TIMER_CTRL_PRESCALE_1024		(5 << 3)
-
-#define JZ_TIMER_CTRL_PRESCALER(x) ((x) << JZ_TIMER_CTRL_PRESCALE_OFFSET)
-
-#define JZ_TIMER_CTRL_SRC_EXT		BIT(2)
-#define JZ_TIMER_CTRL_SRC_RTC		BIT(1)
-#define JZ_TIMER_CTRL_SRC_PCLK		BIT(0)
-
-extern void __iomem *jz4740_timer_base;
-void __init jz4740_timer_init(void);
-
-void jz4740_timer_enable_watchdog(void);
-void jz4740_timer_disable_watchdog(void);
-
-static inline void jz4740_timer_stop(unsigned int timer)
-{
-	writel(BIT(timer), jz4740_timer_base + JZ_REG_TIMER_STOP_SET);
-}
-
-static inline void jz4740_timer_start(unsigned int timer)
-{
-	writel(BIT(timer), jz4740_timer_base + JZ_REG_TIMER_STOP_CLEAR);
-}
-
-static inline bool jz4740_timer_is_enabled(unsigned int timer)
-{
-	return readb(jz4740_timer_base + JZ_REG_TIMER_ENABLE) & BIT(timer);
-}
-
-static inline void jz4740_timer_enable(unsigned int timer)
-{
-	writeb(BIT(timer), jz4740_timer_base + JZ_REG_TIMER_ENABLE_SET);
-}
-
-static inline void jz4740_timer_disable(unsigned int timer)
-{
-	writeb(BIT(timer), jz4740_timer_base + JZ_REG_TIMER_ENABLE_CLEAR);
-}
-
-static inline void jz4740_timer_set_period(unsigned int timer, uint16_t period)
-{
-	writew(period, jz4740_timer_base + JZ_REG_TIMER_DFR(timer));
-}
-
-static inline void jz4740_timer_set_duty(unsigned int timer, uint16_t duty)
-{
-	writew(duty, jz4740_timer_base + JZ_REG_TIMER_DHR(timer));
-}
-
-static inline void jz4740_timer_set_count(unsigned int timer, uint16_t count)
-{
-	writew(count, jz4740_timer_base + JZ_REG_TIMER_CNT(timer));
-}
-
-static inline uint16_t jz4740_timer_get_count(unsigned int timer)
-{
-	return readw(jz4740_timer_base + JZ_REG_TIMER_CNT(timer));
-}
-
-static inline void jz4740_timer_ack_full(unsigned int timer)
-{
-	writel(JZ_TIMER_IRQ_FULL(timer), jz4740_timer_base + JZ_REG_TIMER_FLAG_CLEAR);
-}
-
-static inline void jz4740_timer_irq_full_enable(unsigned int timer)
-{
-	writel(JZ_TIMER_IRQ_FULL(timer), jz4740_timer_base + JZ_REG_TIMER_FLAG_CLEAR);
-	writel(JZ_TIMER_IRQ_FULL(timer), jz4740_timer_base + JZ_REG_TIMER_MASK_CLEAR);
-}
-
-static inline void jz4740_timer_irq_full_disable(unsigned int timer)
-{
-	writel(JZ_TIMER_IRQ_FULL(timer), jz4740_timer_base + JZ_REG_TIMER_MASK_SET);
-}
-
-static inline void jz4740_timer_set_ctrl(unsigned int timer, uint16_t ctrl)
-{
-	writew(ctrl, jz4740_timer_base + JZ_REG_TIMER_CTRL(timer));
-}
-
-static inline uint16_t jz4740_timer_get_ctrl(unsigned int timer)
-{
-	return readw(jz4740_timer_base + JZ_REG_TIMER_CTRL(timer));
-}
-
-#endif
diff --git a/arch/mips/jz4740/Makefile b/arch/mips/jz4740/Makefile
index 88d6aa7d000b..72eb805028a4 100644
--- a/arch/mips/jz4740/Makefile
+++ b/arch/mips/jz4740/Makefile
@@ -5,8 +5,7 @@
 
 # Object file lists.
 
-obj-y += prom.o time.o reset.o setup.o \
-	platform.o timer.o
+obj-y += prom.o reset.o setup.o platform.o
 
 CFLAGS_setup.o = -I$(src)/../../../scripts/dtc/libfdt
 
diff --git a/arch/mips/jz4740/platform.c b/arch/mips/jz4740/platform.c
index cbc5f8e87230..af0ecaeb4931 100644
--- a/arch/mips/jz4740/platform.c
+++ b/arch/mips/jz4740/platform.c
@@ -233,12 +233,6 @@ struct platform_device jz4740_adc_device = {
 	.resource	= jz4740_adc_resources,
 };
 
-/* PWM */
-struct platform_device jz4740_pwm_device = {
-	.name = "jz4740-pwm",
-	.id   = -1,
-};
-
 /* DMA */
 static struct resource jz4740_dma_resources[] = {
 	{
diff --git a/arch/mips/jz4740/setup.c b/arch/mips/jz4740/setup.c
index afb40f8bce96..099e4164afff 100644
--- a/arch/mips/jz4740/setup.c
+++ b/arch/mips/jz4740/setup.c
@@ -14,6 +14,8 @@
  *
  */
 
+#include <linux/clk-provider.h>
+#include <linux/clocksource.h>
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/irqchip.h>
@@ -101,3 +103,9 @@ void __init arch_init_irq(void)
 {
 	irqchip_init();
 }
+
+void __init plat_time_init(void)
+{
+	of_clk_init(NULL);
+	timer_probe();
+}
diff --git a/arch/mips/jz4740/time.c b/arch/mips/jz4740/time.c
deleted file mode 100644
index 2ca9160f642a..000000000000
--- a/arch/mips/jz4740/time.c
+++ /dev/null
@@ -1,176 +0,0 @@
-/*
- *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
- *  JZ4740 platform time support
- *
- *  This program is free software; you can redistribute it and/or modify it
- *  under  the terms of the GNU General	 Public License as published by the
- *  Free Software Foundation;  either version 2 of the License, or (at your
- *  option) any later version.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  675 Mass Ave, Cambridge, MA 02139, USA.
- *
- */
-
-#include <linux/clk.h>
-#include <linux/clk-provider.h>
-#include <linux/interrupt.h>
-#include <linux/kernel.h>
-#include <linux/time.h>
-
-#include <linux/clockchips.h>
-#include <linux/sched_clock.h>
-
-#include <asm/mach-jz4740/clock.h>
-#include <asm/mach-jz4740/irq.h>
-#include <asm/mach-jz4740/timer.h>
-#include <asm/time.h>
-
-#include "clock.h"
-
-#define TIMER_CLOCKEVENT 0
-#define TIMER_CLOCKSOURCE 1
-
-static uint16_t jz4740_jiffies_per_tick;
-
-static u64 jz4740_clocksource_read(struct clocksource *cs)
-{
-	return jz4740_timer_get_count(TIMER_CLOCKSOURCE);
-}
-
-static struct clocksource jz4740_clocksource = {
-	.name = "jz4740-timer",
-	.rating = 200,
-	.read = jz4740_clocksource_read,
-	.mask = CLOCKSOURCE_MASK(16),
-	.flags = CLOCK_SOURCE_IS_CONTINUOUS,
-};
-
-static u64 notrace jz4740_read_sched_clock(void)
-{
-	return jz4740_timer_get_count(TIMER_CLOCKSOURCE);
-}
-
-static irqreturn_t jz4740_clockevent_irq(int irq, void *devid)
-{
-	struct clock_event_device *cd = devid;
-
-	jz4740_timer_ack_full(TIMER_CLOCKEVENT);
-
-	if (!clockevent_state_periodic(cd))
-		jz4740_timer_disable(TIMER_CLOCKEVENT);
-
-	cd->event_handler(cd);
-
-	return IRQ_HANDLED;
-}
-
-static int jz4740_clockevent_set_periodic(struct clock_event_device *evt)
-{
-	jz4740_timer_set_count(TIMER_CLOCKEVENT, 0);
-	jz4740_timer_set_period(TIMER_CLOCKEVENT, jz4740_jiffies_per_tick);
-	jz4740_timer_irq_full_enable(TIMER_CLOCKEVENT);
-	jz4740_timer_enable(TIMER_CLOCKEVENT);
-
-	return 0;
-}
-
-static int jz4740_clockevent_resume(struct clock_event_device *evt)
-{
-	jz4740_timer_irq_full_enable(TIMER_CLOCKEVENT);
-	jz4740_timer_enable(TIMER_CLOCKEVENT);
-
-	return 0;
-}
-
-static int jz4740_clockevent_shutdown(struct clock_event_device *evt)
-{
-	jz4740_timer_disable(TIMER_CLOCKEVENT);
-
-	return 0;
-}
-
-static int jz4740_clockevent_set_next(unsigned long evt,
-	struct clock_event_device *cd)
-{
-	jz4740_timer_set_count(TIMER_CLOCKEVENT, 0);
-	jz4740_timer_set_period(TIMER_CLOCKEVENT, evt);
-	jz4740_timer_enable(TIMER_CLOCKEVENT);
-
-	return 0;
-}
-
-static struct clock_event_device jz4740_clockevent = {
-	.name = "jz4740-timer",
-	.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
-	.set_next_event = jz4740_clockevent_set_next,
-	.set_state_shutdown = jz4740_clockevent_shutdown,
-	.set_state_periodic = jz4740_clockevent_set_periodic,
-	.set_state_oneshot = jz4740_clockevent_shutdown,
-	.tick_resume = jz4740_clockevent_resume,
-	.rating = 200,
-#ifdef CONFIG_MACH_JZ4740
-	.irq = JZ4740_IRQ_TCU0,
-#endif
-#if defined(CONFIG_MACH_JZ4770) || defined(CONFIG_MACH_JZ4780)
-	.irq = JZ4780_IRQ_TCU2,
-#endif
-};
-
-static struct irqaction timer_irqaction = {
-	.handler	= jz4740_clockevent_irq,
-	.flags		= IRQF_PERCPU | IRQF_TIMER,
-	.name		= "jz4740-timerirq",
-	.dev_id		= &jz4740_clockevent,
-};
-
-void __init plat_time_init(void)
-{
-	int ret;
-	uint32_t clk_rate;
-	uint16_t ctrl;
-	struct clk *ext_clk;
-
-	of_clk_init(NULL);
-	jz4740_timer_init();
-
-	ext_clk = clk_get(NULL, "ext");
-	if (IS_ERR(ext_clk))
-		panic("unable to get ext clock");
-	clk_rate = clk_get_rate(ext_clk) >> 4;
-	clk_put(ext_clk);
-
-	jz4740_jiffies_per_tick = DIV_ROUND_CLOSEST(clk_rate, HZ);
-
-	clockevent_set_clock(&jz4740_clockevent, clk_rate);
-	jz4740_clockevent.min_delta_ns = clockevent_delta2ns(100, &jz4740_clockevent);
-	jz4740_clockevent.min_delta_ticks = 100;
-	jz4740_clockevent.max_delta_ns = clockevent_delta2ns(0xffff, &jz4740_clockevent);
-	jz4740_clockevent.max_delta_ticks = 0xffff;
-	jz4740_clockevent.cpumask = cpumask_of(0);
-
-	clockevents_register_device(&jz4740_clockevent);
-
-	ret = clocksource_register_hz(&jz4740_clocksource, clk_rate);
-
-	if (ret)
-		printk(KERN_ERR "Failed to register clocksource: %d\n", ret);
-
-	sched_clock_register(jz4740_read_sched_clock, 16, clk_rate);
-
-	setup_irq(jz4740_clockevent.irq, &timer_irqaction);
-
-	ctrl = JZ_TIMER_CTRL_PRESCALE_16 | JZ_TIMER_CTRL_SRC_EXT;
-
-	jz4740_timer_set_ctrl(TIMER_CLOCKEVENT, ctrl);
-	jz4740_timer_set_ctrl(TIMER_CLOCKSOURCE, ctrl);
-
-	jz4740_timer_set_period(TIMER_CLOCKEVENT, jz4740_jiffies_per_tick);
-	jz4740_timer_irq_full_enable(TIMER_CLOCKEVENT);
-
-	jz4740_timer_set_period(TIMER_CLOCKSOURCE, 0xffff);
-
-	jz4740_timer_enable(TIMER_CLOCKEVENT);
-	jz4740_timer_enable(TIMER_CLOCKSOURCE);
-}
diff --git a/arch/mips/jz4740/timer.c b/arch/mips/jz4740/timer.c
deleted file mode 100644
index 777877feef71..000000000000
--- a/arch/mips/jz4740/timer.c
+++ /dev/null
@@ -1,51 +0,0 @@
-/*
- *  Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
- *  JZ4740 platform timer support
- *
- *  This program is free software; you can redistribute it and/or modify it
- *  under  the terms of the GNU General	 Public License as published by the
- *  Free Software Foundation;  either version 2 of the License, or (at your
- *  option) any later version.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  675 Mass Ave, Cambridge, MA 02139, USA.
- *
- */
-
-#include <linux/export.h>
-#include <linux/io.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-
-#include <asm/mach-jz4740/base.h>
-#include <asm/mach-jz4740/timer.h>
-
-void __iomem *jz4740_timer_base;
-EXPORT_SYMBOL_GPL(jz4740_timer_base);
-
-void jz4740_timer_enable_watchdog(void)
-{
-	writel(BIT(16), jz4740_timer_base + JZ_REG_TIMER_STOP_CLEAR);
-}
-EXPORT_SYMBOL_GPL(jz4740_timer_enable_watchdog);
-
-void jz4740_timer_disable_watchdog(void)
-{
-	writel(BIT(16), jz4740_timer_base + JZ_REG_TIMER_STOP_SET);
-}
-EXPORT_SYMBOL_GPL(jz4740_timer_disable_watchdog);
-
-void __init jz4740_timer_init(void)
-{
-	jz4740_timer_base = ioremap(JZ4740_TCU_BASE_ADDR, 0x100);
-
-	if (!jz4740_timer_base)
-		panic("Failed to ioremap timer registers");
-
-	/* Disable all timer clocks except for those used as system timers */
-	writel(0x000100fc, jz4740_timer_base + JZ_REG_TIMER_STOP_SET);
-
-	/* Timer irqs are unmasked by default, mask them */
-	writel(0x00ff00ff, jz4740_timer_base + JZ_REG_TIMER_MASK_SET);
-}
-- 
2.11.0

Re: [PATCH v5 08/21] watchdog: jz4740: Use regmap and WDT clock provided by TCU driver

[Guenter Roeck]

On 07/24/2018 04:19 PM, Paul Cercueil wrote:
> Instead of requesting the "ext" clock and handling the watchdog clock
> divider and gating in the watchdog driver, we now request and use the
> "wdt" clock that is supplied by the ingenic-timer "TCU" driver.
> 
> The major benefit is that the watchdog's clock rate and parent can now
> be specified from within devicetree, instead of hardcoded in the driver.
> 

Where is the clock _rate_ specified in the devicetree file ?

Changing the clock rate in the driver may not be as hardcoded as before,
but the driver still changes the clock rate.

> Also, this driver won't poke anymore into the TCU registers to
> enable/disable the clock, as this is now handled by the TCU driver.
> 
> On the bad side, we break the ABI with devicetree - as we now request a
> different clock. In this very specific case it is still okay, as every
> Ingenic JZ47xx-based board out there compile the devicetree within the
> kernel; so it's still time to push breaking changes, in order to get a
> clean devicetree that won't break once it musn't.

mustn't

> 

This change needs to be documented in the devicetree bindings and must be
approved by a DT maintainer. The bindings change only changes the clock name
in the example, but not in the bindings description itself (which still
references the rtc clock).

> Since we broke the ABI by changing the clock, the driver was also
> updated to use the regmap provided by the TCU driver.
> 

Odd logic. What does one have to do with the other ? Why not split
the patch into two parts, one per logical change, as would be customary ?

> Signed-off-by: Paul Cercueil <paul@crapouillou.net>
> ---
>   drivers/watchdog/Kconfig      |   2 +
>   drivers/watchdog/jz4740_wdt.c | 128 +++++++++++++++++++++---------------------
>   2 files changed, 66 insertions(+), 64 deletions(-)
> 
>   v5: New patch
> 
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index 9af07fd92763..834222abbbdb 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -1476,7 +1476,9 @@ config INDYDOG
>   config JZ4740_WDT
>   	tristate "Ingenic jz4740 SoC hardware watchdog"
>   	depends on MACH_JZ4740 || MACH_JZ4780
> +	depends on COMMON_CLK
>   	select WATCHDOG_CORE
> +	select INGENIC_TIMER
>   	help
>   	  Hardware driver for the built-in watchdog timer on Ingenic jz4740 SoCs.
>   
> diff --git a/drivers/watchdog/jz4740_wdt.c b/drivers/watchdog/jz4740_wdt.c
> index ec4d99a830ba..aaa6fc87136c 100644
> --- a/drivers/watchdog/jz4740_wdt.c
> +++ b/drivers/watchdog/jz4740_wdt.c
> @@ -13,6 +13,7 @@
>    *
>    */
>   
> +#include <linux/mfd/ingenic-tcu.h>
>   #include <linux/module.h>
>   #include <linux/moduleparam.h>
>   #include <linux/types.h>
> @@ -25,26 +26,7 @@
>   #include <linux/slab.h>
>   #include <linux/err.h>
>   #include <linux/of.h>
> -
> -#include <asm/mach-jz4740/timer.h>
> -
> -#define JZ_REG_WDT_TIMER_DATA     0x0
> -#define JZ_REG_WDT_COUNTER_ENABLE 0x4
> -#define JZ_REG_WDT_TIMER_COUNTER  0x8
> -#define JZ_REG_WDT_TIMER_CONTROL  0xC
> -
> -#define JZ_WDT_CLOCK_PCLK 0x1
> -#define JZ_WDT_CLOCK_RTC  0x2
> -#define JZ_WDT_CLOCK_EXT  0x4
> -
> -#define JZ_WDT_CLOCK_DIV_SHIFT   3
> -
> -#define JZ_WDT_CLOCK_DIV_1    (0 << JZ_WDT_CLOCK_DIV_SHIFT)
> -#define JZ_WDT_CLOCK_DIV_4    (1 << JZ_WDT_CLOCK_DIV_SHIFT)
> -#define JZ_WDT_CLOCK_DIV_16   (2 << JZ_WDT_CLOCK_DIV_SHIFT)
> -#define JZ_WDT_CLOCK_DIV_64   (3 << JZ_WDT_CLOCK_DIV_SHIFT)
> -#define JZ_WDT_CLOCK_DIV_256  (4 << JZ_WDT_CLOCK_DIV_SHIFT)
> -#define JZ_WDT_CLOCK_DIV_1024 (5 << JZ_WDT_CLOCK_DIV_SHIFT)
> +#include <linux/regmap.h>
>   
>   #define DEFAULT_HEARTBEAT 5
>   #define MAX_HEARTBEAT     2048
> @@ -64,15 +46,15 @@ MODULE_PARM_DESC(heartbeat,
>   
>   struct jz4740_wdt_drvdata {
>   	struct watchdog_device wdt;
> -	void __iomem *base;
> -	struct clk *rtc_clk;
> +	struct regmap *map;
> +	struct clk *clk;
>   };
>   
>   static int jz4740_wdt_ping(struct watchdog_device *wdt_dev)
>   {
>   	struct jz4740_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
>   
> -	writew(0x0, drvdata->base + JZ_REG_WDT_TIMER_COUNTER);
> +	regmap_write(drvdata->map, TCU_REG_WDT_TCNT, 0);
>   	return 0;
>   }
>   
> @@ -80,52 +62,65 @@ static int jz4740_wdt_set_timeout(struct watchdog_device *wdt_dev,
>   				    unsigned int new_timeout)
>   {
>   	struct jz4740_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
> -	unsigned int rtc_clk_rate;
> -	unsigned int timeout_value;
> -	unsigned short clock_div = JZ_WDT_CLOCK_DIV_1;
> -
> -	rtc_clk_rate = clk_get_rate(drvdata->rtc_clk);
> -
> -	timeout_value = rtc_clk_rate * new_timeout;
> -	while (timeout_value > 0xffff) {
> -		if (clock_div == JZ_WDT_CLOCK_DIV_1024) {
> -			/* Requested timeout too high;
> -			* use highest possible value. */
> -			timeout_value = 0xffff;
> -			break;
> -		}
> -		timeout_value >>= 2;
> -		clock_div += (1 << JZ_WDT_CLOCK_DIV_SHIFT);
> +	struct clk *clk = drvdata->clk;
> +	unsigned long clk_rate, timeout_value;
> +	bool change_rate = false;
> +	u32 tcer;
> +	int ret = 0;
> +
> +	clk_rate = clk_get_rate(clk);
> +	timeout_value = clk_rate * new_timeout;
> +
> +	if (timeout_value > 0xffff) {
> +		clk_rate = clk_round_rate(clk, 0xffff / new_timeout);
> +		timeout_value = clk_rate * new_timeout;
> +		if (timeout_value > 0xffff)
> +			return -EINVAL;

This is conceptually wrong. The probe code should determine the
maximum timeout and report it to the watchdog core, and it should
not be necessary to validate the timeout in this function.

Also, unless I am missing something, the new code only ever reduces the clock
rate and never increases it. Given that, you might as well set the clock
rate to the lowest possible rate when instantiating the driver and not
bother with updating it later. That would simplify the code significantly
and make it much easier to understand.

Also, clk_round_rate() can technically return 0 or even a negative (error)
value. Please make sure that the returned rate is valid.

> +		change_rate = true;
>   	}
>   
> -	writeb(0x0, drvdata->base + JZ_REG_WDT_COUNTER_ENABLE);
> -	writew(clock_div, drvdata->base + JZ_REG_WDT_TIMER_CONTROL);
> +	regmap_read(drvdata->map, TCU_REG_WDT_TCER, &tcer);
> +	regmap_write(drvdata->map, TCU_REG_WDT_TCER, 0);
>   
> -	writew((u16)timeout_value, drvdata->base + JZ_REG_WDT_TIMER_DATA);
> -	writew(0x0, drvdata->base + JZ_REG_WDT_TIMER_COUNTER);
> -	writew(clock_div | JZ_WDT_CLOCK_RTC,
> -		drvdata->base + JZ_REG_WDT_TIMER_CONTROL);
> +	if (change_rate) {
> +		clk_disable_unprepare(clk);
> +		ret = clk_set_rate(clk, clk_rate);
> +		clk_prepare_enable(clk);
> +		if (ret)
> +			goto done;
> +	}
>   
> -	writeb(0x1, drvdata->base + JZ_REG_WDT_COUNTER_ENABLE);
> +	regmap_write(drvdata->map, TCU_REG_WDT_TDR, (u16)timeout_value);
> +	regmap_write(drvdata->map, TCU_REG_WDT_TCNT, 0);
>   
>   	wdt_dev->timeout = new_timeout;
> -	return 0;
> +
> +done:
> +	regmap_write(drvdata->map, TCU_REG_WDT_TCER, tcer & TCU_WDT_TCER_TCEN);

regmap_read() and regmap_write return errors. Are those ignored on purpose ?

> +	return ret;
>   }
>   
>   static int jz4740_wdt_start(struct watchdog_device *wdt_dev)
>   {
> -	jz4740_timer_enable_watchdog();
> -	jz4740_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
> +	struct jz4740_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
> +	int ret;
>   
> -	return 0;
> +	clk_prepare_enable(drvdata->clk);
> +	ret = jz4740_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
> +	if (ret)
> +		clk_disable_unprepare(drvdata->clk);
> +	else
> +		regmap_write(drvdata->map, TCU_REG_WDT_TCER, TCU_WDT_TCER_TCEN);
> +

No else here please. Proper error handling is preferred.

> +	return ret;
>   }
>   
>   static int jz4740_wdt_stop(struct watchdog_device *wdt_dev)
>   {
>   	struct jz4740_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
>   
> -	writeb(0x0, drvdata->base + JZ_REG_WDT_COUNTER_ENABLE);
> -	jz4740_timer_disable_watchdog();
> +	regmap_write(drvdata->map, TCU_REG_WDT_TCER, 0);
> +	clk_disable_unprepare(drvdata->clk);
>   
>   	return 0;
>   }
> @@ -163,13 +158,17 @@ MODULE_DEVICE_TABLE(of, jz4740_wdt_of_matches);
>   
>   static int jz4740_wdt_probe(struct platform_device *pdev)
>   {
> +	struct device *dev = &pdev->dev;
>   	struct jz4740_wdt_drvdata *drvdata;
>   	struct watchdog_device *jz4740_wdt;
> -	struct resource	*res;
>   	int ret;
>   
> -	drvdata = devm_kzalloc(&pdev->dev, sizeof(struct jz4740_wdt_drvdata),
> -			       GFP_KERNEL);
> +	if (!dev->of_node) {
> +		dev_err(dev, "jz4740-wdt must be probed via devicetree\n");
> +		return -ENODEV;
> +	}
> +

Please explain. This check seems technically unnecessary and thus pointless.
The driver doesn't even initialize its watchdog timeout from devicetree data.

> +	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
>   	if (!drvdata)
>   		return -ENOMEM;
>   
> @@ -182,19 +181,20 @@ static int jz4740_wdt_probe(struct platform_device *pdev)
>   	jz4740_wdt->timeout = heartbeat;
>   	jz4740_wdt->min_timeout = 1;
>   	jz4740_wdt->max_timeout = MAX_HEARTBEAT;
> -	jz4740_wdt->parent = &pdev->dev;
> +	jz4740_wdt->parent = dev;
>   	watchdog_set_nowayout(jz4740_wdt, nowayout);
>   	watchdog_set_drvdata(jz4740_wdt, drvdata);
>   
> -	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> -	drvdata->base = devm_ioremap_resource(&pdev->dev, res);
> -	if (IS_ERR(drvdata->base))
> -		return PTR_ERR(drvdata->base);
> +	drvdata->map = dev_get_regmap(dev->parent, NULL);
> +	if (IS_ERR(drvdata->map)) {

dev_get_regmap() does not return an ERR_PTR().

> +		dev_warn(dev, "regmap not found\n");
> +		return PTR_ERR(drvdata->map);
> +	}
>   
> -	drvdata->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
> -	if (IS_ERR(drvdata->rtc_clk)) {
> -		dev_err(&pdev->dev, "cannot find RTC clock\n");
> -		return PTR_ERR(drvdata->rtc_clk);
> +	drvdata->clk = devm_clk_get(&pdev->dev, "wdt");
> +	if (IS_ERR(drvdata->clk)) {
> +		dev_err(&pdev->dev, "cannot find WDT clock\n");
> +		return PTR_ERR(drvdata->clk);
>   	}
>   
>   	ret = devm_watchdog_register_device(&pdev->dev, &drvdata->wdt);
> 

Re: [PATCH v5 04/21] dt-bindings: Add doc for the Ingenic TCU drivers

[Rob Herring]

On Wed, Jul 25, 2018 at 01:19:41AM +0200, Paul Cercueil wrote:
> Add documentation about how to properly use the Ingenic TCU
> (Timer/Counter Unit) drivers from devicetree.
> 
> Signed-off-by: Paul Cercueil <paul@crapouillou.net>
> ---
>  .../devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt |  24 +---
>  .../devicetree/bindings/timer/ingenic,tcu.txt      | 147 +++++++++++++++++++++
>  .../bindings/watchdog/ingenic,jz4740-wdt.txt       |  17 +--
>  3 files changed, 151 insertions(+), 37 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/timer/ingenic,tcu.txt
> 
>  v4: New patch in this series. Corresponds to V2 patches 3-4-5 with
>      added content.
> 
>  v5: - Edited PWM/watchdog DT bindings documentation to point to the new
>        document.
>      - Moved main document to
>        Documentation/devicetree/bindings/timer/ingenic,tcu.txt
>      - Updated documentation to reflect the new devicetree bindings.
> 
> diff --git a/Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt b/Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt
> index 7d9d3f90641b..a722cdde3aa7 100644
> --- a/Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt
> +++ b/Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt
> @@ -1,25 +1,5 @@
>  Ingenic JZ47xx PWM Controller
>  =============================
>  
> -Required properties:
> -- compatible: One of:
> -  * "ingenic,jz4740-pwm"
> -  * "ingenic,jz4770-pwm"
> -  * "ingenic,jz4780-pwm"
> -- #pwm-cells: Should be 3. See pwm.txt in this directory for a description
> -  of the cells format.
> -- clocks : phandle to the external clock.
> -- clock-names : Should be "ext".
> -
> -
> -Example:
> -
> -	pwm: pwm@10002000 {
> -		compatible = "ingenic,jz4740-pwm";
> -		reg = <0x10002000 0x1000>;
> -
> -		#pwm-cells = <3>;
> -
> -		clocks = <&ext>;
> -		clock-names = "ext";
> -	};
> +This documentation has moved; for a description of the devicetree bindings of
> +this driver, please refer to ../timer/ingenic,tcu.txt.

This should be evident from the git log. Just remove it.

> diff --git a/Documentation/devicetree/bindings/timer/ingenic,tcu.txt b/Documentation/devicetree/bindings/timer/ingenic,tcu.txt
> new file mode 100644
> index 000000000000..65d125b460aa
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/timer/ingenic,tcu.txt
> @@ -0,0 +1,147 @@
> +Ingenic JZ47xx SoCs Timer/Counter Unit devicetree bindings
> +==========================================================
> +
> +For a description of the TCU hardware and drivers, have a look at
> +Documentation/mips/ingenic-tcu.txt.
> +
> +Required properties:
> +
> +- compatible: Must be one of:
> +  * ingenic,jz4740-tcu
> +  * ingenic,jz4725b-tcu
> +  * ingenic,jz4770-tcu
> +- reg: Should be the offset/length value corresponding to the TCU registers

> +- #address-cells: Should be <1>;
> +- #size-cells: Should be <1>;
> +- ranges: Should be one range for the full TCU registers area

These can all be implied.

> +- clocks: List of phandle & clock specifiers for clocks external to the TCU.
> +  The "pclk", "rtc", "ext" and "tcu" clocks should be provided.
> +- clock-names: List of name strings for the external clocks.
> +- #clock-cells: Should be <1>;
> +  Clock consumers specify this argument to identify a clock. The valid values
> +  may be found in <dt-bindings/clock/ingenic,tcu.h>.
> +- interrupt-controller : Identifies the node as an interrupt controller
> +- #interrupt-cells : Specifies the number of cells needed to encode an
> +  interrupt source. The value should be 1.
> +- interrupt-parent : phandle of the interrupt controller.
> +- interrupts : Specifies the interrupt the controller is connected to.

How many and what are they. The example shows there are 3.
> +
> +Optional properties:
> +
> +- ingenic,timer-channel: Specifies the TCU channel that should be used as
> +  system timer. If not provided, the TCU channel 0 is used for the system timer.
> +
> +- ingenic,clocksource-channel: Specifies the TCU channel that should be used
> +  as clocksource and sched_clock. It must be a different channel than the one
> +  used as system timer. If not provided, neither a clocksource nor a
> +  sched_clock is instantiated.

clocksource and sched_clock are Linux specific and don't belong in DT. 
You should define properties of the hardware or use existing properties 
like interrupts or clocks to figure out which channel to use. For 
example, if some channels don't have an interrupt, then use them for 
clocksource and not a clockevent. Or you could have timers that run in 
low-power modes or not. If all the channels are identical, then it 
shouldn't matter which ones the OS picks.

> +
> +
> +Children nodes
> +==========================================================
> +
> +
> +PWM node:
> +---------
> +
> +Required properties:
> +
> +- compatible: Must be one of:
> +  * ingenic,jz4740-pwm
> +  * ingenic,jz4725b-pwm
> +- #pwm-cells: Should be 3. See ../pwm/pwm.txt for a description of the cell
> +  format.
> +- clocks: List of phandle & clock specifiers for the TCU clocks.
> +- clock-names: List of name strings for the TCU clocks.
> +
> +
> +Watchdog node:
> +--------------
> +
> +Required properties:
> +
> +- compatible: Must be one of:
> +  * ingenic,jz4740-watchdog
> +  * ingenic,jz4780-watchdog
> +- clocks: phandle to the RTC clock
> +- clock-names: should be "rtc"
> +
> +
> +OST node:
> +---------
> +
> +Required properties:
> +
> +- compatible: Must be one of:
> +  * ingenic,jz4725b-ost
> +  * ingenic,jz4770-ost
> +- clocks: phandle to the OST clock
> +- clock-names: should be "ost"
> +- interrupts : Specifies the interrupt the OST is connected to.
> +
> +
> +Example
> +==========================================================
> +
> +#include <dt-bindings/clock/jz4770-cgu.h>
> +#include <dt-bindings/clock/ingenic,tcu.h>
> +
> +/ {
> +	tcu: timer@10002000 {
> +		compatible = "ingenic,jz4770-tcu";
> +		reg = <0x10002000 0x1000>;
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		ranges = <0x0 0x10002000 0x1000>;
> +
> +		#clock-cells = <1>;
> +
> +		clocks = <&cgu JZ4770_CLK_RTC
> +			  &cgu JZ4770_CLK_EXT
> +			  &cgu JZ4770_CLK_PCLK
> +			  &cgu JZ4770_CLK_EXT>;
> +		clock-names = "rtc", "ext", "pclk", "tcu";
> +
> +		interrupt-controller;
> +		#interrupt-cells = <1>;
> +
> +		interrupt-parent = <&intc>;
> +		interrupts = <27 26 25>;
> +
> +		watchdog: watchdog@0 {
> +			compatible = "ingenic,jz4740-watchdog";
> +			reg = <0x0 0x10>;
> +
> +			clocks = <&tcu TCU_CLK_WDT>;
> +			clock-names = "wdt";
> +		};
> +
> +		pwm: pwm@10 {
> +			compatible = "ingenic,jz4740-pwm";
> +			reg = <0x10 0xff0>;
> +
> +			#pwm-cells = <3>;
> +
> +			clocks = <&tcu TCU_CLK_TIMER0
> +				  &tcu TCU_CLK_TIMER1
> +				  &tcu TCU_CLK_TIMER2
> +				  &tcu TCU_CLK_TIMER3
> +				  &tcu TCU_CLK_TIMER4
> +				  &tcu TCU_CLK_TIMER5
> +				  &tcu TCU_CLK_TIMER6
> +				  &tcu TCU_CLK_TIMER7>;
> +			clock-names = "timer0", "timer1", "timer2", "timer3",
> +				      "timer4", "timer5", "timer6", "timer7";
> +		};
> +
> +		ost: timer@e0 {
> +			compatible = "ingenic,jz4770-ost";
> +			reg = <0xe0 0x20>;

This is creating an overlapping region with PWM which should be avoided. 
Are timers and PWM the same h/w? Then there should be one node (or maybe 
you can do 1 node per channel if each channel is independent (has its 
own register range, clocks, interrupts, etc.

Or the PWM node needs to exclude this region (by having 2 reg regions).

> +
> +			clocks = <&tcu TCU_CLK_OST>;
> +			clock-names = "ost";
> +
> +			interrupts = <15>;
> +		};
> +	};
> +};

Re: [PATCH v5 14/21] clk: jz4740: Add TCU clock

[Rob Herring]

On Wed, Jul 25, 2018 at 01:19:51AM +0200, Paul Cercueil wrote:
> Add the missing TCU clock to the list of clocks supplied by the CGU for
> the JZ4740 SoC.
> 
> Signed-off-by: Paul Cercueil <paul@crapouillou.net>
> ---
>  drivers/clk/ingenic/jz4740-cgu.c       | 6 ++++++
>  include/dt-bindings/clock/jz4740-cgu.h | 1 +
>  2 files changed, 7 insertions(+)

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

Re: [PATCH v5 14/21] clk: jz4740: Add TCU clock

[Stephen Boyd]

Quoting Paul Cercueil (2018-07-24 16:19:51)
> Add the missing TCU clock to the list of clocks supplied by the CGU for
> the JZ4740 SoC.
> 
> Signed-off-by: Paul Cercueil <paul@crapouillou.net>
> ---

Acked-by: Stephen Boyd <sboyd@kernel.org>

Re: [PATCH v5 08/21] watchdog: jz4740: Use regmap and WDT clock provided by TCU driver

[Paul Cercueil]

Hi Guenter,

Le mer. 25 juil. 2018 à 3:14, Guenter Roeck <linux@roeck-us.net> a 
écrit :
> On 07/24/2018 04:19 PM, Paul Cercueil wrote:
>> Instead of requesting the "ext" clock and handling the watchdog clock
>> divider and gating in the watchdog driver, we now request and use the
>> "wdt" clock that is supplied by the ingenic-timer "TCU" driver.
>> 
>> The major benefit is that the watchdog's clock rate and parent can 
>> now
>> be specified from within devicetree, instead of hardcoded in the 
>> driver.
>> 
> 
> Where is the clock _rate_ specified in the devicetree file ?
> 
> Changing the clock rate in the driver may not be as hardcoded as 
> before,
> but the driver still changes the clock rate.

Right.

>> Also, this driver won't poke anymore into the TCU registers to
>> enable/disable the clock, as this is now handled by the TCU driver.
>> 
>> On the bad side, we break the ABI with devicetree - as we now 
>> request a
>> different clock. In this very specific case it is still okay, as 
>> every
>> Ingenic JZ47xx-based board out there compile the devicetree within 
>> the
>> kernel; so it's still time to push breaking changes, in order to get 
>> a
>> clean devicetree that won't break once it musn't.
> 
> mustn't
> 
>> 
> 
> This change needs to be documented in the devicetree bindings and 
> must be
> approved by a DT maintainer. The bindings change only changes the 
> clock name
> in the example, but not in the bindings description itself (which 
> still
> references the rtc clock).

Right, that's an error in the doc. Easily fixed.

>> Since we broke the ABI by changing the clock, the driver was also
>> updated to use the regmap provided by the TCU driver.
>> 
> 
> Odd logic. What does one have to do with the other ? Why not split
> the patch into two parts, one per logical change, as would be 
> customary ?

I didn't want to break the devicetree ABI twice ;)
I'll split them.

>> Signed-off-by: Paul Cercueil <paul@crapouillou.net>
>> ---
>>   drivers/watchdog/Kconfig      |   2 +
>>   drivers/watchdog/jz4740_wdt.c | 128 
>> +++++++++++++++++++++---------------------
>>   2 files changed, 66 insertions(+), 64 deletions(-)
>> 
>>   v5: New patch
>> 
>> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
>> index 9af07fd92763..834222abbbdb 100644
>> --- a/drivers/watchdog/Kconfig
>> +++ b/drivers/watchdog/Kconfig
>> @@ -1476,7 +1476,9 @@ config INDYDOG
>>   config JZ4740_WDT
>>   	tristate "Ingenic jz4740 SoC hardware watchdog"
>>   	depends on MACH_JZ4740 || MACH_JZ4780
>> +	depends on COMMON_CLK
>>   	select WATCHDOG_CORE
>> +	select INGENIC_TIMER
>>   	help
>>   	  Hardware driver for the built-in watchdog timer on Ingenic 
>> jz4740 SoCs.
>>   \x7fdiff --git a/drivers/watchdog/jz4740_wdt.c 
>> b/drivers/watchdog/jz4740_wdt.c
>> index ec4d99a830ba..aaa6fc87136c 100644
>> --- a/drivers/watchdog/jz4740_wdt.c
>> +++ b/drivers/watchdog/jz4740_wdt.c
>> @@ -13,6 +13,7 @@
>>    *
>>    */
>>   \x7f+#include <linux/mfd/ingenic-tcu.h>
>>   #include <linux/module.h>
>>   #include <linux/moduleparam.h>
>>   #include <linux/types.h>
>> @@ -25,26 +26,7 @@
>>   #include <linux/slab.h>
>>   #include <linux/err.h>
>>   #include <linux/of.h>
>> -
>> -#include <asm/mach-jz4740/timer.h>
>> -
>> -#define JZ_REG_WDT_TIMER_DATA     0x0
>> -#define JZ_REG_WDT_COUNTER_ENABLE 0x4
>> -#define JZ_REG_WDT_TIMER_COUNTER  0x8
>> -#define JZ_REG_WDT_TIMER_CONTROL  0xC
>> -
>> -#define JZ_WDT_CLOCK_PCLK 0x1
>> -#define JZ_WDT_CLOCK_RTC  0x2
>> -#define JZ_WDT_CLOCK_EXT  0x4
>> -
>> -#define JZ_WDT_CLOCK_DIV_SHIFT   3
>> -
>> -#define JZ_WDT_CLOCK_DIV_1    (0 << JZ_WDT_CLOCK_DIV_SHIFT)
>> -#define JZ_WDT_CLOCK_DIV_4    (1 << JZ_WDT_CLOCK_DIV_SHIFT)
>> -#define JZ_WDT_CLOCK_DIV_16   (2 << JZ_WDT_CLOCK_DIV_SHIFT)
>> -#define JZ_WDT_CLOCK_DIV_64   (3 << JZ_WDT_CLOCK_DIV_SHIFT)
>> -#define JZ_WDT_CLOCK_DIV_256  (4 << JZ_WDT_CLOCK_DIV_SHIFT)
>> -#define JZ_WDT_CLOCK_DIV_1024 (5 << JZ_WDT_CLOCK_DIV_SHIFT)
>> +#include <linux/regmap.h>
>>   \x7f  #define DEFAULT_HEARTBEAT 5
>>   #define MAX_HEARTBEAT     2048
>> @@ -64,15 +46,15 @@ MODULE_PARM_DESC(heartbeat,
>>   \x7f  struct jz4740_wdt_drvdata {
>>   	struct watchdog_device wdt;
>> -	void __iomem *base;
>> -	struct clk *rtc_clk;
>> +	struct regmap *map;
>> +	struct clk *clk;
>>   };
>>   \x7f  static int jz4740_wdt_ping(struct watchdog_device *wdt_dev)
>>   {
>>   	struct jz4740_wdt_drvdata *drvdata = 
>> watchdog_get_drvdata(wdt_dev);
>>   \x7f-	writew(0x0, drvdata->base + JZ_REG_WDT_TIMER_COUNTER);
>> +	regmap_write(drvdata->map, TCU_REG_WDT_TCNT, 0);
>>   	return 0;
>>   }
>>   \x7f@@ -80,52 +62,65 @@ static int jz4740_wdt_set_timeout(struct 
>> watchdog_device *wdt_dev,
>>   				    unsigned int new_timeout)
>>   {
>>   	struct jz4740_wdt_drvdata *drvdata = 
>> watchdog_get_drvdata(wdt_dev);
>> -	unsigned int rtc_clk_rate;
>> -	unsigned int timeout_value;
>> -	unsigned short clock_div = JZ_WDT_CLOCK_DIV_1;
>> -
>> -	rtc_clk_rate = clk_get_rate(drvdata->rtc_clk);
>> -
>> -	timeout_value = rtc_clk_rate * new_timeout;
>> -	while (timeout_value > 0xffff) {
>> -		if (clock_div == JZ_WDT_CLOCK_DIV_1024) {
>> -			/* Requested timeout too high;
>> -			* use highest possible value. */
>> -			timeout_value = 0xffff;
>> -			break;
>> -		}
>> -		timeout_value >>= 2;
>> -		clock_div += (1 << JZ_WDT_CLOCK_DIV_SHIFT);
>> +	struct clk *clk = drvdata->clk;
>> +	unsigned long clk_rate, timeout_value;
>> +	bool change_rate = false;
>> +	u32 tcer;
>> +	int ret = 0;
>> +
>> +	clk_rate = clk_get_rate(clk);
>> +	timeout_value = clk_rate * new_timeout;
>> +
>> +	if (timeout_value > 0xffff) {
>> +		clk_rate = clk_round_rate(clk, 0xffff / new_timeout);
>> +		timeout_value = clk_rate * new_timeout;
>> +		if (timeout_value > 0xffff)
>> +			return -EINVAL;
> 
> This is conceptually wrong. The probe code should determine the
> maximum timeout and report it to the watchdog core, and it should
> not be necessary to validate the timeout in this function.

That sounds better indeed.

> Also, unless I am missing something, the new code only ever reduces 
> the clock
> rate and never increases it. Given that, you might as well set the 
> clock
> rate to the lowest possible rate when instantiating the driver and not
> bother with updating it later. That would simplify the code 
> significantly
> and make it much easier to understand.

Actually I could even use whatever rate the clock is running at without 
trying
to change it within the driver. Then my clock provider can default to 
the highest
divider, and the rate would be overridable in devicetree for those who 
don't like
the default rate.

> Also, clk_round_rate() can technically return 0 or even a negative 
> (error)
> value. Please make sure that the returned rate is valid.
> 
>> +		change_rate = true;
>>   	}
>>   \x7f-	writeb(0x0, drvdata->base + JZ_REG_WDT_COUNTER_ENABLE);
>> -	writew(clock_div, drvdata->base + JZ_REG_WDT_TIMER_CONTROL);
>> +	regmap_read(drvdata->map, TCU_REG_WDT_TCER, &tcer);
>> +	regmap_write(drvdata->map, TCU_REG_WDT_TCER, 0);
>>   \x7f-	writew((u16)timeout_value, drvdata->base + 
>> JZ_REG_WDT_TIMER_DATA);
>> -	writew(0x0, drvdata->base + JZ_REG_WDT_TIMER_COUNTER);
>> -	writew(clock_div | JZ_WDT_CLOCK_RTC,
>> -		drvdata->base + JZ_REG_WDT_TIMER_CONTROL);
>> +	if (change_rate) {
>> +		clk_disable_unprepare(clk);
>> +		ret = clk_set_rate(clk, clk_rate);
>> +		clk_prepare_enable(clk);
>> +		if (ret)
>> +			goto done;
>> +	}
>>   \x7f-	writeb(0x1, drvdata->base + JZ_REG_WDT_COUNTER_ENABLE);
>> +	regmap_write(drvdata->map, TCU_REG_WDT_TDR, (u16)timeout_value);
>> +	regmap_write(drvdata->map, TCU_REG_WDT_TCNT, 0);
>>   \x7f  	wdt_dev->timeout = new_timeout;
>> -	return 0;
>> +
>> +done:
>> +	regmap_write(drvdata->map, TCU_REG_WDT_TCER, tcer & 
>> TCU_WDT_TCER_TCEN);
> 
> regmap_read() and regmap_write return errors. Are those ignored on 
> purpose ?

Sort of. It's MMIO without IOMMU, what can go wrong?

>> +	return ret;
>>   }
>>   \x7f  static int jz4740_wdt_start(struct watchdog_device *wdt_dev)
>>   {
>> -	jz4740_timer_enable_watchdog();
>> -	jz4740_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
>> +	struct jz4740_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
>> +	int ret;
>>   \x7f-	return 0;
>> +	clk_prepare_enable(drvdata->clk);
>> +	ret = jz4740_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
>> +	if (ret)
>> +		clk_disable_unprepare(drvdata->clk);
>> +	else
>> +		regmap_write(drvdata->map, TCU_REG_WDT_TCER, TCU_WDT_TCER_TCEN);
>> +
> 
> No else here please. Proper error handling is preferred.

Sure.

>> +	return ret;
>>   }
>>   \x7f  static int jz4740_wdt_stop(struct watchdog_device *wdt_dev)
>>   {
>>   	struct jz4740_wdt_drvdata *drvdata = 
>> watchdog_get_drvdata(wdt_dev);
>>   \x7f-	writeb(0x0, drvdata->base + JZ_REG_WDT_COUNTER_ENABLE);
>> -	jz4740_timer_disable_watchdog();
>> +	regmap_write(drvdata->map, TCU_REG_WDT_TCER, 0);
>> +	clk_disable_unprepare(drvdata->clk);
>>   \x7f  	return 0;
>>   }
>> @@ -163,13 +158,17 @@ MODULE_DEVICE_TABLE(of, jz4740_wdt_of_matches);
>>   \x7f  static int jz4740_wdt_probe(struct platform_device *pdev)
>>   {
>> +	struct device *dev = &pdev->dev;
>>   	struct jz4740_wdt_drvdata *drvdata;
>>   	struct watchdog_device *jz4740_wdt;
>> -	struct resource	*res;
>>   	int ret;
>>   \x7f-	drvdata = devm_kzalloc(&pdev->dev, sizeof(struct 
>> jz4740_wdt_drvdata),
>> -			       GFP_KERNEL);
>> +	if (!dev->of_node) {
>> +		dev_err(dev, "jz4740-wdt must be probed via devicetree\n");
>> +		return -ENODEV;
>> +	}
>> +
> 
> Please explain. This check seems technically unnecessary and thus 
> pointless.
> The driver doesn't even initialize its watchdog timeout from 
> devicetree data.

Right, we get the regmap from the device's parent but that does not 
imply devicetree.
I'll remove that.

>> +	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
>>   	if (!drvdata)
>>   		return -ENOMEM;
>>   \x7f@@ -182,19 +181,20 @@ static int jz4740_wdt_probe(struct 
>> platform_device *pdev)
>>   	jz4740_wdt->timeout = heartbeat;
>>   	jz4740_wdt->min_timeout = 1;
>>   	jz4740_wdt->max_timeout = MAX_HEARTBEAT;
>> -	jz4740_wdt->parent = &pdev->dev;
>> +	jz4740_wdt->parent = dev;
>>   	watchdog_set_nowayout(jz4740_wdt, nowayout);
>>   	watchdog_set_drvdata(jz4740_wdt, drvdata);
>>   \x7f-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> -	drvdata->base = devm_ioremap_resource(&pdev->dev, res);
>> -	if (IS_ERR(drvdata->base))
>> -		return PTR_ERR(drvdata->base);
>> +	drvdata->map = dev_get_regmap(dev->parent, NULL);
>> +	if (IS_ERR(drvdata->map)) {
> 
> dev_get_regmap() does not return an ERR_PTR().

Oops.

>> +		dev_warn(dev, "regmap not found\n");
>> +		return PTR_ERR(drvdata->map);
>> +	}
>>   \x7f-	drvdata->rtc_clk = devm_clk_get(&pdev->dev, "rtc");
>> -	if (IS_ERR(drvdata->rtc_clk)) {
>> -		dev_err(&pdev->dev, "cannot find RTC clock\n");
>> -		return PTR_ERR(drvdata->rtc_clk);
>> +	drvdata->clk = devm_clk_get(&pdev->dev, "wdt");
>> +	if (IS_ERR(drvdata->clk)) {
>> +		dev_err(&pdev->dev, "cannot find WDT clock\n");
>> +		return PTR_ERR(drvdata->clk);
>>   	}
>>   \x7f  	ret = devm_watchdog_register_device(&pdev->dev, &drvdata->wdt);
>> 
> 

Thanks!
-Paul Cercueil

Re: [PATCH v5 04/21] dt-bindings: Add doc for the Ingenic TCU drivers

[Paul Cercueil]

Hi Rob,

Le mer. 25 juil. 2018 à 17:21, Rob Herring <robh@kernel.org> a écrit :
> On Wed, Jul 25, 2018 at 01:19:41AM +0200, Paul Cercueil wrote:
>>  Add documentation about how to properly use the Ingenic TCU
>>  (Timer/Counter Unit) drivers from devicetree.
>> 
>>  Signed-off-by: Paul Cercueil <paul@crapouillou.net>
>>  ---
>>   .../devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt |  24 +---
>>   .../devicetree/bindings/timer/ingenic,tcu.txt      | 147 
>> +++++++++++++++++++++
>>   .../bindings/watchdog/ingenic,jz4740-wdt.txt       |  17 +--
>>   3 files changed, 151 insertions(+), 37 deletions(-)
>>   create mode 100644 
>> Documentation/devicetree/bindings/timer/ingenic,tcu.txt
>> 
>>   v4: New patch in this series. Corresponds to V2 patches 3-4-5 with
>>       added content.
>> 
>>   v5: - Edited PWM/watchdog DT bindings documentation to point to 
>> the new
>>         document.
>>       - Moved main document to
>>         Documentation/devicetree/bindings/timer/ingenic,tcu.txt
>>       - Updated documentation to reflect the new devicetree bindings.
>> 
>>  diff --git 
>> a/Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt 
>> b/Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt
>>  index 7d9d3f90641b..a722cdde3aa7 100644
>>  --- a/Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt
>>  +++ b/Documentation/devicetree/bindings/pwm/ingenic,jz47xx-pwm.txt
>>  @@ -1,25 +1,5 @@
>>   Ingenic JZ47xx PWM Controller
>>   =============================
>> 
>>  -Required properties:
>>  -- compatible: One of:
>>  -  * "ingenic,jz4740-pwm"
>>  -  * "ingenic,jz4770-pwm"
>>  -  * "ingenic,jz4780-pwm"
>>  -- #pwm-cells: Should be 3. See pwm.txt in this directory for a 
>> description
>>  -  of the cells format.
>>  -- clocks : phandle to the external clock.
>>  -- clock-names : Should be "ext".
>>  -
>>  -
>>  -Example:
>>  -
>>  -	pwm: pwm@10002000 {
>>  -		compatible = "ingenic,jz4740-pwm";
>>  -		reg = <0x10002000 0x1000>;
>>  -
>>  -		#pwm-cells = <3>;
>>  -
>>  -		clocks = <&ext>;
>>  -		clock-names = "ext";
>>  -	};
>>  +This documentation has moved; for a description of the devicetree 
>> bindings of
>>  +this driver, please refer to ../timer/ingenic,tcu.txt.
> 
> This should be evident from the git log. Just remove it.

Ok.

>>  diff --git 
>> a/Documentation/devicetree/bindings/timer/ingenic,tcu.txt 
>> b/Documentation/devicetree/bindings/timer/ingenic,tcu.txt
>>  new file mode 100644
>>  index 000000000000..65d125b460aa
>>  --- /dev/null
>>  +++ b/Documentation/devicetree/bindings/timer/ingenic,tcu.txt
>>  @@ -0,0 +1,147 @@
>>  +Ingenic JZ47xx SoCs Timer/Counter Unit devicetree bindings
>>  +==========================================================
>>  +
>>  +For a description of the TCU hardware and drivers, have a look at
>>  +Documentation/mips/ingenic-tcu.txt.
>>  +
>>  +Required properties:
>>  +
>>  +- compatible: Must be one of:
>>  +  * ingenic,jz4740-tcu
>>  +  * ingenic,jz4725b-tcu
>>  +  * ingenic,jz4770-tcu
>>  +- reg: Should be the offset/length value corresponding to the TCU 
>> registers
> 
>>  +- #address-cells: Should be <1>;
>>  +- #size-cells: Should be <1>;
>>  +- ranges: Should be one range for the full TCU registers area
> 
> These can all be implied.

Ok.

>>  +- clocks: List of phandle & clock specifiers for clocks external 
>> to the TCU.
>>  +  The "pclk", "rtc", "ext" and "tcu" clocks should be provided.
>>  +- clock-names: List of name strings for the external clocks.
>>  +- #clock-cells: Should be <1>;
>>  +  Clock consumers specify this argument to identify a clock. The 
>> valid values
>>  +  may be found in <dt-bindings/clock/ingenic,tcu.h>.
>>  +- interrupt-controller : Identifies the node as an interrupt 
>> controller
>>  +- #interrupt-cells : Specifies the number of cells needed to 
>> encode an
>>  +  interrupt source. The value should be 1.
>>  +- interrupt-parent : phandle of the interrupt controller.
>>  +- interrupts : Specifies the interrupt the controller is connected 
>> to.
> 
> How many and what are they. The example shows there are 3.

They are 2 or 3, and they are all the same (three parent IRQs for one 
irqchip).
It's explained in the hardware doc, should I add it here as well?

>>  +
>>  +Optional properties:
>>  +
>>  +- ingenic,timer-channel: Specifies the TCU channel that should be 
>> used as
>>  +  system timer. If not provided, the TCU channel 0 is used for the 
>> system timer.
>>  +
>>  +- ingenic,clocksource-channel: Specifies the TCU channel that 
>> should be used
>>  +  as clocksource and sched_clock. It must be a different channel 
>> than the one
>>  +  used as system timer. If not provided, neither a clocksource nor 
>> a
>>  +  sched_clock is instantiated.
> 
> clocksource and sched_clock are Linux specific and don't belong in DT.
> You should define properties of the hardware or use existing 
> properties
> like interrupts or clocks to figure out which channel to use. For
> example, if some channels don't have an interrupt, then use them for
> clocksource and not a clockevent. Or you could have timers that run in
> low-power modes or not. If all the channels are identical, then it
> shouldn't matter which ones the OS picks.

We already talked about that. All the TCU channels can be used for PWM.
The problem is I cannot know from the driver's scope which channels will
be free and which channels will be requested for PWM. You suggested 
that I
parse the devicetree for clients, and I did that in the V3/V4 patchset. 
But
it only works for clients requesting through devicetree, not from 
platform
code or even sysfs.

One thing I can try is to dynamically change the channels the system 
timer
and clocksource are using when the current ones are requested for PWM. 
But
that sounds hardcore...

>>  +
>>  +
>>  +Children nodes
>>  +==========================================================
>>  +
>>  +
>>  +PWM node:
>>  +---------
>>  +
>>  +Required properties:
>>  +
>>  +- compatible: Must be one of:
>>  +  * ingenic,jz4740-pwm
>>  +  * ingenic,jz4725b-pwm
>>  +- #pwm-cells: Should be 3. See ../pwm/pwm.txt for a description of 
>> the cell
>>  +  format.
>>  +- clocks: List of phandle & clock specifiers for the TCU clocks.
>>  +- clock-names: List of name strings for the TCU clocks.
>>  +
>>  +
>>  +Watchdog node:
>>  +--------------
>>  +
>>  +Required properties:
>>  +
>>  +- compatible: Must be one of:
>>  +  * ingenic,jz4740-watchdog
>>  +  * ingenic,jz4780-watchdog
>>  +- clocks: phandle to the RTC clock
>>  +- clock-names: should be "rtc"
>>  +
>>  +
>>  +OST node:
>>  +---------
>>  +
>>  +Required properties:
>>  +
>>  +- compatible: Must be one of:
>>  +  * ingenic,jz4725b-ost
>>  +  * ingenic,jz4770-ost
>>  +- clocks: phandle to the OST clock
>>  +- clock-names: should be "ost"
>>  +- interrupts : Specifies the interrupt the OST is connected to.
>>  +
>>  +
>>  +Example
>>  +==========================================================
>>  +
>>  +#include <dt-bindings/clock/jz4770-cgu.h>
>>  +#include <dt-bindings/clock/ingenic,tcu.h>
>>  +
>>  +/ {
>>  +	tcu: timer@10002000 {
>>  +		compatible = "ingenic,jz4770-tcu";
>>  +		reg = <0x10002000 0x1000>;
>>  +		#address-cells = <1>;
>>  +		#size-cells = <1>;
>>  +		ranges = <0x0 0x10002000 0x1000>;
>>  +
>>  +		#clock-cells = <1>;
>>  +
>>  +		clocks = <&cgu JZ4770_CLK_RTC
>>  +			  &cgu JZ4770_CLK_EXT
>>  +			  &cgu JZ4770_CLK_PCLK
>>  +			  &cgu JZ4770_CLK_EXT>;
>>  +		clock-names = "rtc", "ext", "pclk", "tcu";
>>  +
>>  +		interrupt-controller;
>>  +		#interrupt-cells = <1>;
>>  +
>>  +		interrupt-parent = <&intc>;
>>  +		interrupts = <27 26 25>;
>>  +
>>  +		watchdog: watchdog@0 {
>>  +			compatible = "ingenic,jz4740-watchdog";
>>  +			reg = <0x0 0x10>;
>>  +
>>  +			clocks = <&tcu TCU_CLK_WDT>;
>>  +			clock-names = "wdt";
>>  +		};
>>  +
>>  +		pwm: pwm@10 {
>>  +			compatible = "ingenic,jz4740-pwm";
>>  +			reg = <0x10 0xff0>;
>>  +
>>  +			#pwm-cells = <3>;
>>  +
>>  +			clocks = <&tcu TCU_CLK_TIMER0
>>  +				  &tcu TCU_CLK_TIMER1
>>  +				  &tcu TCU_CLK_TIMER2
>>  +				  &tcu TCU_CLK_TIMER3
>>  +				  &tcu TCU_CLK_TIMER4
>>  +				  &tcu TCU_CLK_TIMER5
>>  +				  &tcu TCU_CLK_TIMER6
>>  +				  &tcu TCU_CLK_TIMER7>;
>>  +			clock-names = "timer0", "timer1", "timer2", "timer3",
>>  +				      "timer4", "timer5", "timer6", "timer7";
>>  +		};
>>  +
>>  +		ost: timer@e0 {
>>  +			compatible = "ingenic,jz4770-ost";
>>  +			reg = <0xe0 0x20>;
> 
> This is creating an overlapping region with PWM which should be 
> avoided.
> Are timers and PWM the same h/w? Then there should be one node (or 
> maybe
> you can do 1 node per channel if each channel is independent (has its
> own register range, clocks, interrupts, etc.
> 
> Or the PWM node needs to exclude this region (by having 2 reg 
> regions).

I will use two regions then.

>> 
>  +};
>> 
>  +	};
>>  +
>>  +			clocks = <&tcu TCU_CLK_OST>;
>>  +			clock-names = "ost";
>>  +
>>  +			interrupts = <15>;
>>  +		};

Thanks,
-Paul Cercueil

Re: [PATCH v5 04/21] dt-bindings: Add doc for the Ingenic TCU drivers

[Daniel Lezcano]

On 31/07/2018 00:01, Paul Cercueil wrote:

[ ... ]

>>>  +- ingenic,timer-channel: Specifies the TCU channel that should be
>>> used as
>>>  +  system timer. If not provided, the TCU channel 0 is used for the
>>> system timer.
>>>  +
>>>  +- ingenic,clocksource-channel: Specifies the TCU channel that
>>> should be used
>>>  +  as clocksource and sched_clock. It must be a different channel
>>> than the one
>>>  +  used as system timer. If not provided, neither a clocksource nor a
>>>  +  sched_clock is instantiated.
>>
>> clocksource and sched_clock are Linux specific and don't belong in DT.
>> You should define properties of the hardware or use existing properties
>> like interrupts or clocks to figure out which channel to use. For
>> example, if some channels don't have an interrupt, then use them for
>> clocksource and not a clockevent. Or you could have timers that run in
>> low-power modes or not. If all the channels are identical, then it
>> shouldn't matter which ones the OS picks.

It can't work in this case because the pmw and the timer driver are not
communicating and the first one can stole a channel to the last one.


> We already talked about that. All the TCU channels can be used for PWM.
> The problem is I cannot know from the driver's scope which channels will
> be free and which channels will be requested for PWM. You suggested that I
> parse the devicetree for clients, and I did that in the V3/V4 patchset. But
> it only works for clients requesting through devicetree, not from platform
> code or even sysfs.
> 
> One thing I can try is to dynamically change the channels the system timer
> and clocksource are using when the current ones are requested for PWM. But
> that sounds hardcore...

Yes, it is :/

Sorry for letting you wasting time and effort to write an overkill code
not suitable for upstream.

A very gross thought, wouldn't be possible to "register" a channel from
the timer driver code in a shared data area (but well self-encapsulated)
and the pwm code will check such channel isn't in use ?

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