linux-kernel - Re: [PATCHv4 06/10] mfd: ti-lmu: add PWM support

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Date:   Wed, 4 Apr 2018 14:04:16 -0500
From:   Dan Murphy <dmurphy@...com>
To:     Sebastian Reichel <sebastian.reichel@...labora.co.uk>,
        Sebastian Reichel <sre@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Tony Lindgren <tony@...mide.com>
CC:     Jingoo Han <jingoohan1@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        <linux-kernel@...r.kernel.org>, <linux-fbdev@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-omap@...r.kernel.org>
Subject: Re: [PATCHv4 06/10] mfd: ti-lmu: add PWM support

Sebastian

-Milo

On 03/30/2018 12:24 PM, Sebastian Reichel wrote:
> This adds support to acquire the optional PWM channel,
> that can be used by some of the LMU variants.
> 
> Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.co.uk>
> ---
>  drivers/mfd/ti-lmu.c       | 11 +++++++++++
>  include/linux/mfd/ti-lmu.h |  3 +++
>  2 files changed, 14 insertions(+)
> 
> diff --git a/drivers/mfd/ti-lmu.c b/drivers/mfd/ti-lmu.c
> index ce16c896879b..f43b8acc30e1 100644
> --- a/drivers/mfd/ti-lmu.c
> +++ b/drivers/mfd/ti-lmu.c
> @@ -183,6 +183,17 @@ static int ti_lmu_probe(struct i2c_client *cl, const struct i2c_device_id *id)
>  		return ret;
>  	}
>  
> +	lmu->pwm = devm_pwm_get(dev, "lmu-backlight");

Patch 9 of this series, or a derivative of it, should technically be before Patch 6 so that the binding is correct.
Otherwise the binding will not match the code

Dan



> +	if (IS_ERR(lmu->pwm)) {
> +		ret = PTR_ERR(lmu->pwm);
> +		if (ret != -EINVAL) {
> +			dev_err(dev, "Failed to get PWM: %d\n", ret);
> +			return ret;
> +		}
> +
> +		lmu->pwm = NULL;
> +	}
> +
>  	ret = ti_lmu_enable_hw(lmu, id->driver_data);
>  	if (ret)
>  		return ret;
> diff --git a/include/linux/mfd/ti-lmu.h b/include/linux/mfd/ti-lmu.h
> index 1ef51ed36be5..246ab5145dff 100644
> --- a/include/linux/mfd/ti-lmu.h
> +++ b/include/linux/mfd/ti-lmu.h
> @@ -17,6 +17,7 @@
>  #include <linux/notifier.h>
>  #include <linux/regmap.h>
>  #include <linux/gpio/consumer.h>
> +#include <linux/pwm.h>
>  
>  /* Notifier event */
>  #define LMU_EVENT_MONITOR_DONE		0x01
> @@ -77,12 +78,14 @@ enum lm363x_regulator_id {
>   * @dev:	Parent device pointer
>   * @regmap:	Used for i2c communcation on accessing registers
>   * @en_gpio:	GPIO for HWEN pin [Optional]
> + * @pwm:	PWM for module [Optional]
>   * @notifier:	Notifier for reporting hwmon event
>   */
>  struct ti_lmu {
>  	struct device *dev;
>  	struct regmap *regmap;
>  	struct gpio_desc *en_gpio;
> +	struct pwm_device *pwm;
>  	struct blocking_notifier_head notifier;
>  };
>  #endif
> 


-- 
------------------
Dan Murphy