[RESEND PATCH 0/3] pwm: lpc32xx: switch driver to one phandle argument for PWM consumers

[RESEND PATCH 0/3] pwm: lpc32xx: switch driver to one phandle argument for PWM consumers

[slemieux.tyco]

From: Sylvain Lemieux <slemieux@tycoint.com>

The change adds private of_xlate() function to process one argument given along with a PWM phandle. LPC32xx SoCs have two independent single channel PWM controllers, the argument is used as a description of PWM output frequency, see previous discussion here:

  http://www.spinics.net/lists/arm-kernel/msg534068.html

The changes on actual board dts files are not needed at the moment, because all LPC32xx boards in upstream don't describe any PWM consumers.

Please refer to the following URL to view the previous patch #1 review discussion:
  http://www.spinics.net/lists/arm-kernel/msg549772.html

The "Reviewed-by" and "Acked-by" from the original posting are added into this resend.

Vladimir Zapolskiy (3):
  dt: pwm: lpc32xx: add description of clocks and #pwm-cells properties
  pwm: lpc32xx: switch driver to one phandle argument for PWM consumers
  pwm: lpc32xx: remove handling of PWM channels

 .../devicetree/bindings/pwm/lpc32xx-pwm.txt        |  7 +++++
 drivers/pwm/pwm-lpc32xx.c                          | 36 +++++++++++++++-------
 2 files changed, 32 insertions(+), 11 deletions(-)

-- 
2.11.0

[RESEND PATCH 1/3] dt: pwm: lpc32xx: add description of clocks and #pwm-cells properties

[slemieux.tyco-Re5JQEeQqe8AvxtiuMwx3w]

From: Vladimir Zapolskiy <vz-ChpfBGZJDbMAvxtiuMwx3w@public.gmane.org>

NXP LPC32xx SoCs have two simple independent PWM controllers with a single
output each, in this case there is no need to specify PWM channel argument
on client side, one cell for setting PWM output frequency is sufficient.

Another added to the description property 'clocks' has a standard meaning
of a controller supply clock, in the LPC32xx User's Manual the clock is
denoted as PWM1_CLK or PWM2_CLK clock.

Signed-off-by: Vladimir Zapolskiy <vz-ChpfBGZJDbMAvxtiuMwx3w@public.gmane.org>
Reviewed-by: Sylvain Lemieux <slemieux.tyco-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 Documentation/devicetree/bindings/pwm/lpc32xx-pwm.txt | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/pwm/lpc32xx-pwm.txt b/Documentation/devicetree/bindings/pwm/lpc32xx-pwm.txt
index 74b5bc5dd19a..523d79662861 100644
--- a/Documentation/devicetree/bindings/pwm/lpc32xx-pwm.txt
+++ b/Documentation/devicetree/bindings/pwm/lpc32xx-pwm.txt
@@ -3,15 +3,22 @@ LPC32XX PWM controller
 Required properties:
 - compatible: should be "nxp,lpc3220-pwm"
 - reg: physical base address and length of the controller's registers
+- clocks: clock phandle and clock specifier pair
+- #pwm-cells: should be 1, the cell is used to specify the period in
+  nanoseconds.
 
 Examples:
 
 pwm@4005c000 {
 	compatible = "nxp,lpc3220-pwm";
 	reg = <0x4005c000 0x4>;
+	clocks = <&clk LPC32XX_CLK_PWM1>;
+	#pwm-cells = <1>;
 };
 
 pwm@4005c004 {
 	compatible = "nxp,lpc3220-pwm";
 	reg = <0x4005c004 0x4>;
+	clocks = <&clk LPC32XX_CLK_PWM2>;
+	#pwm-cells = <1>;
 };
-- 
2.11.0

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Re: [RESEND PATCH 1/3] dt: pwm: lpc32xx: add description of clocks and #pwm-cells properties

[Sylvain Lemieux]

ping

On Thu, 2017-02-16 at 15:27 -0500, slemieux.tyco@gmail.com wrote:
> From: Vladimir Zapolskiy <vz@mleia.com>
> 
> NXP LPC32xx SoCs have two simple independent PWM controllers with a single
> output each, in this case there is no need to specify PWM channel argument
> on client side, one cell for setting PWM output frequency is sufficient.
> 
> Another added to the description property 'clocks' has a standard meaning
> of a controller supply clock, in the LPC32xx User's Manual the clock is
> denoted as PWM1_CLK or PWM2_CLK clock.
> 
> Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
> Reviewed-by: Sylvain Lemieux <slemieux.tyco@gmail.com>
> Acked-by: Rob Herring <robh@kernel.org>
> ---
>  Documentation/devicetree/bindings/pwm/lpc32xx-pwm.txt | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/pwm/lpc32xx-pwm.txt b/Documentation/devicetree/bindings/pwm/lpc32xx-pwm.txt
> index 74b5bc5dd19a..523d79662861 100644
> --- a/Documentation/devicetree/bindings/pwm/lpc32xx-pwm.txt
> +++ b/Documentation/devicetree/bindings/pwm/lpc32xx-pwm.txt
> @@ -3,15 +3,22 @@ LPC32XX PWM controller
>  Required properties:
>  - compatible: should be "nxp,lpc3220-pwm"
>  - reg: physical base address and length of the controller's registers
> +- clocks: clock phandle and clock specifier pair
> +- #pwm-cells: should be 1, the cell is used to specify the period in
> +  nanoseconds.
>  
>  Examples:
>  
>  pwm@4005c000 {
>  	compatible = "nxp,lpc3220-pwm";
>  	reg = <0x4005c000 0x4>;
> +	clocks = <&clk LPC32XX_CLK_PWM1>;
> +	#pwm-cells = <1>;
>  };
>  
>  pwm@4005c004 {
>  	compatible = "nxp,lpc3220-pwm";
>  	reg = <0x4005c004 0x4>;
> +	clocks = <&clk LPC32XX_CLK_PWM2>;
> +	#pwm-cells = <1>;
>  };

[RESEND PATCH 3/3] pwm: lpc32xx: remove handling of PWM channels

[slemieux.tyco-Re5JQEeQqe8AvxtiuMwx3w]

From: Vladimir Zapolskiy <vz-ChpfBGZJDbMAvxtiuMwx3w@public.gmane.org>

Because LPC32xx PWM controllers have single output which is registered as
the only PWM device/channel per controller, it is known in advance that
pwm->hwpwm value is always 0. On basis of this fact simplify the code
by removing operations with pwm->hwpwm, there is no controls which require
channel number as input.

Signed-off-by: Vladimir Zapolskiy <vz-ChpfBGZJDbMAvxtiuMwx3w@public.gmane.org>
Reviewed-by: Sylvain Lemieux <slemieux.tyco-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/pwm/pwm-lpc32xx.c | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/drivers/pwm/pwm-lpc32xx.c b/drivers/pwm/pwm-lpc32xx.c
index ce8418101e85..786c887c296d 100644
--- a/drivers/pwm/pwm-lpc32xx.c
+++ b/drivers/pwm/pwm-lpc32xx.c
@@ -55,10 +55,10 @@ static int lpc32xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
 	if (duty_cycles > 255)
 		duty_cycles = 255;
 
-	val = readl(lpc32xx->base + (pwm->hwpwm << 2));
+	val = readl(lpc32xx->base);
 	val &= ~0xFFFF;
 	val |= (period_cycles << 8) | duty_cycles;
-	writel(val, lpc32xx->base + (pwm->hwpwm << 2));
+	writel(val, lpc32xx->base);
 
 	return 0;
 }
@@ -73,9 +73,9 @@ static int lpc32xx_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
 	if (ret)
 		return ret;
 
-	val = readl(lpc32xx->base + (pwm->hwpwm << 2));
+	val = readl(lpc32xx->base);
 	val |= PWM_ENABLE;
-	writel(val, lpc32xx->base + (pwm->hwpwm << 2));
+	writel(val, lpc32xx->base);
 
 	return 0;
 }
@@ -85,9 +85,9 @@ static void lpc32xx_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
 	struct lpc32xx_pwm_chip *lpc32xx = to_lpc32xx_pwm_chip(chip);
 	u32 val;
 
-	val = readl(lpc32xx->base + (pwm->hwpwm << 2));
+	val = readl(lpc32xx->base);
 	val &= ~PWM_ENABLE;
-	writel(val, lpc32xx->base + (pwm->hwpwm << 2));
+	writel(val, lpc32xx->base);
 
 	clk_disable_unprepare(lpc32xx->clk);
 }
@@ -147,9 +147,9 @@ static int lpc32xx_pwm_probe(struct platform_device *pdev)
 	}
 
 	/* When PWM is disable, configure the output to the default value */
-	val = readl(lpc32xx->base + (lpc32xx->chip.pwms[0].hwpwm << 2));
+	val = readl(lpc32xx->base);
 	val &= ~PWM_PIN_LEVEL;
-	writel(val, lpc32xx->base + (lpc32xx->chip.pwms[0].hwpwm << 2));
+	writel(val, lpc32xx->base);
 
 	platform_set_drvdata(pdev, lpc32xx);
 
@@ -159,10 +159,8 @@ static int lpc32xx_pwm_probe(struct platform_device *pdev)
 static int lpc32xx_pwm_remove(struct platform_device *pdev)
 {
 	struct lpc32xx_pwm_chip *lpc32xx = platform_get_drvdata(pdev);
-	unsigned int i;
 
-	for (i = 0; i < lpc32xx->chip.npwm; i++)
-		pwm_disable(&lpc32xx->chip.pwms[i]);
+	pwm_disable(&lpc32xx->chip.pwms[0]);
 
 	return pwmchip_remove(&lpc32xx->chip);
 }
-- 
2.11.0

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[RESEND PATCH 2/3] pwm: lpc32xx: switch driver to one phandle argument for PWM consumers

[slemieux.tyco]

From: Vladimir Zapolskiy <vz@mleia.com>

NXP LPC32xx SoCs have two simple independent PWM controllers with a single
output each, in this case there is no need to specify PWM channel argument
on client side, one cell for setting PWM output frequency is sufficient.

The change adds private of_xlate() handling of a single cell value given
with a PWM phandle on client side, the handling is taken from the PXA PWM
driver.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Reviewed-by: Sylvain Lemieux <slemieux.tyco@gmail.com>
---
 drivers/pwm/pwm-lpc32xx.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/pwm/pwm-lpc32xx.c b/drivers/pwm/pwm-lpc32xx.c
index a9b3cff96aac..ce8418101e85 100644
--- a/drivers/pwm/pwm-lpc32xx.c
+++ b/drivers/pwm/pwm-lpc32xx.c
@@ -92,6 +92,20 @@ static void lpc32xx_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
 	clk_disable_unprepare(lpc32xx->clk);
 }
 
+static struct pwm_device *lpc32xx_pwm_of_xlate(struct pwm_chip *pc,
+				       const struct of_phandle_args *args)
+{
+	struct pwm_device *pwm;
+
+	pwm = pwm_request_from_chip(pc, 0, NULL);
+	if (IS_ERR(pwm))
+		return pwm;
+
+	pwm->args.period = args->args[0];
+
+	return pwm;
+}
+
 static const struct pwm_ops lpc32xx_pwm_ops = {
 	.config = lpc32xx_pwm_config,
 	.enable = lpc32xx_pwm_enable,
@@ -123,6 +137,8 @@ static int lpc32xx_pwm_probe(struct platform_device *pdev)
 	lpc32xx->chip.ops = &lpc32xx_pwm_ops;
 	lpc32xx->chip.npwm = 1;
 	lpc32xx->chip.base = -1;
+	lpc32xx->chip.of_xlate = lpc32xx_pwm_of_xlate;
+	lpc32xx->chip.of_pwm_n_cells = 1;
 
 	ret = pwmchip_add(&lpc32xx->chip);
 	if (ret < 0) {
-- 
2.11.0

Re: [RESEND PATCH 0/3] pwm: lpc32xx: switch driver to one phandle argument for PWM consumers

[Sylvain Lemieux]

On Thu, 2017-02-16 at 15:27 -0500, slemieux.tyco@gmail.com wrote:
> From: Sylvain Lemieux <slemieux@tycoint.com>
> 
> The change adds private of_xlate() function to process one argument given along with a PWM phandle. LPC32xx SoCs have two independent single channel PWM controllers, the argument is used as a description of PWM output frequency, see previous discussion here:
> 
>   http://www.spinics.net/lists/arm-kernel/msg534068.html
> 
> The changes on actual board dts files are not needed at the moment, because all LPC32xx boards in upstream don't describe any PWM consumers.
> 
> Please refer to the following URL to view the previous patch #1 review discussion:
>   http://www.spinics.net/lists/arm-kernel/msg549772.html
> 
Hi Thierry,

can you take this patchset for 4.12?

Let me know if you have more questions.

Regards,
Sylvain

> The "Reviewed-by" and "Acked-by" from the original posting are added into this resend.
> 
> Vladimir Zapolskiy (3):
>   dt: pwm: lpc32xx: add description of clocks and #pwm-cells properties
>   pwm: lpc32xx: switch driver to one phandle argument for PWM consumers
>   pwm: lpc32xx: remove handling of PWM channels
> 
>  .../devicetree/bindings/pwm/lpc32xx-pwm.txt        |  7 +++++
>  drivers/pwm/pwm-lpc32xx.c                          | 36 +++++++++++++++-------
>  2 files changed, 32 insertions(+), 11 deletions(-)
>