linux-kernel - Re: [PATCHv3 3/3] pwm: imx: support output polarity inversion

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Date:	Wed, 2 Apr 2014 07:45:49 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Lothar Waßmann <LW@...O-electronics.de>
Cc:	Thierry Reding <thierry.reding@...il.com>,
	linux-kernel@...r.kernel.org, linux-pwm@...r.kernel.org,
	Shawn Guo <shawn.guo@...aro.org>,
	Sascha Hauer <kernel@...gutronix.de>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCHv3 3/3] pwm: imx: support output polarity inversion

Hi Lothar,

On Fri, Mar 28, 2014 at 09:49:00AM +0100, Lothar Waßmann wrote:
>  static struct pwm_ops imx_pwm_ops = {
>  	.enable = imx_pwm_enable,
>  	.disable = imx_pwm_disable,
> @@ -210,6 +228,7 @@ struct imx_pwm_data {
>  	int (*config)(struct pwm_chip *chip,
>  		struct pwm_device *pwm, int duty_ns, int period_ns);
>  	void (*set_enable)(struct pwm_chip *chip, bool enable);
> +	unsigned output_polarity:1;
>  };
>  
>  static struct imx_pwm_data imx_pwm_data_v1 = {
> @@ -220,6 +239,7 @@ static struct imx_pwm_data imx_pwm_data_v1 = {
>  static struct imx_pwm_data imx_pwm_data_v2 = {
>  	.config = imx_pwm_config_v2,
>  	.set_enable = imx_pwm_set_enable_v2,
> +	.output_polarity = 1,
>  };
>  
>  static const struct of_device_id imx_pwm_dt_ids[] = {
> @@ -272,6 +292,11 @@ static int imx_pwm_probe(struct platform_device *pdev)
>  		return PTR_ERR(imx->mmio_base);
>  
>  	data = of_id->data;
> +	if (data->output_polarity) {
> +		dev_dbg(&pdev->dev, "PWM supports output inversion\n");
> +		imx_pwm_ops.set_polarity = imx_pwm_set_polarity;
> +	}

You shouldn't modify imx_pwm_ops in the probe function, it's not good
style and prevents us from making the ops const.

Sascha

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