linux-kernel - Re: [PATCH 1/2] drivers: pwm: pwm-atmel: add support for pwm on sama5d2

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Date:   Thu, 23 Feb 2017 10:16:07 +0100
From:   Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:     Claudiu Beznea <claudiu.beznea@...rochip.com>
Cc:     thierry.reding@...il.com, robh+dt@...nel.org, pawel.moll@....com,
        mark.rutland@....com, ijc+devicetree@...lion.org.uk,
        galak@...eaurora.org, boris.brezillon@...e-electrons.com,
        linux-pwm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] drivers: pwm: pwm-atmel: add support for pwm on
 sama5d2

On 23/02/2017 at 10:38:39 +0200, Claudiu Beznea wrote:
> Enable PWM on sama5d2 by adding atmel_pwm_config_v3().
> This, simply, sets the period and duty factor registers.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
Acked-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>

> ---
>  Documentation/devicetree/bindings/pwm/atmel-pwm.txt |  1 +
>  drivers/pwm/pwm-atmel.c                             | 16 ++++++++++++++++
>  2 files changed, 17 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/pwm/atmel-pwm.txt b/Documentation/devicetree/bindings/pwm/atmel-pwm.txt
> index 02331b9..c8c831d 100644
> --- a/Documentation/devicetree/bindings/pwm/atmel-pwm.txt
> +++ b/Documentation/devicetree/bindings/pwm/atmel-pwm.txt
> @@ -4,6 +4,7 @@ Required properties:
>    - compatible: should be one of:
>      - "atmel,at91sam9rl-pwm"
>      - "atmel,sama5d3-pwm"
> +    - "atmel,sama5d2-pwm"
>    - reg: physical base address and length of the controller's registers
>    - #pwm-cells: Should be 3. See pwm.txt in this directory for a
>      description of the cells format.
> diff --git a/drivers/pwm/pwm-atmel.c b/drivers/pwm/pwm-atmel.c
> index 0e4bd4e..4406639 100644
> --- a/drivers/pwm/pwm-atmel.c
> +++ b/drivers/pwm/pwm-atmel.c
> @@ -207,6 +207,15 @@ static void atmel_pwm_config_v2(struct pwm_chip *chip, struct pwm_device *pwm,
>  	}
>  }
>  
> +static void atmel_pwm_config_v3(struct pwm_chip *chip, struct pwm_device *pwm,
> +				unsigned long dty, unsigned long prd)
> +{
> +	struct atmel_pwm_chip *atmel_pwm = to_atmel_pwm_chip(chip);
> +
> +	atmel_pwm_ch_writel(atmel_pwm, pwm->hwpwm, PWMV2_CDTY, dty);
> +	atmel_pwm_ch_writel(atmel_pwm, pwm->hwpwm, PWMV2_CPRD, prd);
> +}
> +
>  static int atmel_pwm_set_polarity(struct pwm_chip *chip, struct pwm_device *pwm,
>  				  enum pwm_polarity polarity)
>  {
> @@ -295,6 +304,10 @@ static const struct atmel_pwm_data atmel_pwm_data_v2 = {
>  	.config = atmel_pwm_config_v2,
>  };
>  
> +static const struct atmel_pwm_data atmel_pwm_data_v3 = {
> +	.config = atmel_pwm_config_v3,
> +};
> +
>  static const struct platform_device_id atmel_pwm_devtypes[] = {
>  	{
>  		.name = "at91sam9rl-pwm",
> @@ -316,6 +329,9 @@ static const struct of_device_id atmel_pwm_dt_ids[] = {
>  		.compatible = "atmel,sama5d3-pwm",
>  		.data = &atmel_pwm_data_v2,
>  	}, {
> +		.compatible = "atmel,sama5d2-pwm",
> +		.data = &atmel_pwm_data_v3,
> +	}, {
>  		/* sentinel */
>  	},
>  };
> -- 
> 2.7.4
> 

-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com