linux-kernel - Re: [RFC PATCH 4/6] extcon-gpio: Add devicetree support

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Message-ID: <20130912164545.GG22013@e106331-lin.cambridge.arm.com>
Date:	Thu, 12 Sep 2013 17:45:45 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	Pawel Moll <Pawel.Moll@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ian.campbell@...rix.com>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>
Subject: Re: [RFC PATCH 4/6] extcon-gpio: Add devicetree support

On Fri, Aug 30, 2013 at 05:29:36AM +0100, Guenter Roeck wrote:
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
>  drivers/extcon/extcon-gpio.c |   59 ++++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 57 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/extcon/extcon-gpio.c b/drivers/extcon/extcon-gpio.c
> index d4e3c89..16951fe 100644
> --- a/drivers/extcon/extcon-gpio.c
> +++ b/drivers/extcon/extcon-gpio.c
> @@ -30,6 +30,8 @@
>  #include <linux/gpio.h>
>  #include <linux/extcon.h>
>  #include <linux/extcon/extcon-gpio.h>
> +#include <linux/of_gpio.h>
> +#include <linux/err.h>
>  
>  struct gpio_extcon_data {
>  	struct extcon_dev edev;
> @@ -77,14 +79,66 @@ static ssize_t extcon_gpio_print_state(struct extcon_dev *edev, char *buf)
>  	return -EINVAL;
>  }
>  
> +#ifdef CONFIG_OF_GPIO
> +
> +static struct gpio_extcon_platform_data *
> +extcon_gpio_config_of(struct device *dev)
> +{
> +	struct gpio_extcon_platform_data *pdata;
> +	struct device_node *np = dev->of_node;
> +	enum of_gpio_flags flags;
> +	int gpio, ret;
> +	u32 debounce;
> +
> +	gpio = of_get_named_gpio_flags(np, "presence-detect-gpios", 0, &flags);
> +	if (gpio < 0)
> +		return ERR_PTR(gpio);
> +
> +	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
> +	if (!pdata)
> +		return ERR_PTR(-ENOMEM);
> +
> +	pdata->gpio = gpio;
> +	pdata->gpio_active_low = flags & OF_GPIO_ACTIVE_LOW;
> +	pdata->irq_flags = IRQ_TYPE_EDGE_BOTH;
> +
> +	if (!of_property_read_u32(np, "debounce-interval", &debounce))
> +		pdata->debounce = debounce;
> +
> +	ret = of_property_read_string(np, "name", &pdata->name);

This wasn't listed in the binding. What's this for?

Thanks,
Mark.

> +	if (ret < 0)
> +		return ERR_PTR(ret);
> +
> +	of_property_read_string(np, "state-on", &pdata->state_on);
> +	of_property_read_string(np, "state-off", &pdata->state_off);
> +
> +	return pdata;
> +}
> +
> +static const struct of_device_id of_gpio_extcon_match[] = {
> +	{ .compatible = "gpio-connector", },
> +	{},
> +};
> +#else /* CONFIG_OF_GPIO */
> +static struct gpio_extcon_platform_data *
> +extcon_gpio_config_of(struct device *pdev)
> +{
> +	return ERR_PTR(-ENODEV);
> +}
> +#endif /* CONFIG_OF_GPIO */
> +
>  static int gpio_extcon_probe(struct platform_device *pdev)
>  {
>  	struct gpio_extcon_platform_data *pdata = pdev->dev.platform_data;
>  	struct gpio_extcon_data *extcon_data;
>  	int ret;
>  
> -	if (!pdata)
> -		return -EBUSY;
> +	if (!pdata) {
> +		pdata = extcon_gpio_config_of(&pdev->dev);
> +		if (IS_ERR(pdata))
> +			return PTR_ERR(pdata);
> +	}
> +
>  	if (!pdata->irq_flags) {
>  		dev_err(&pdev->dev, "IRQ flag is not specified.\n");
>  		return -EINVAL;
> @@ -161,6 +215,7 @@ static struct platform_driver gpio_extcon_driver = {
>  	.driver		= {
>  		.name	= "extcon-gpio",
>  		.owner	= THIS_MODULE,
> +		.of_match_table = of_match_ptr(of_gpio_extcon_match),
>  	},
>  };
>  
> -- 
> 1.7.9.7
> 
> 
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