linux-kernel - Re: [PATCH v1 1/4] gpiolib: Unify the checks on fwnode type

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Date:   Tue, 2 Mar 2021 17:48:35 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-gpio@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH v1 1/4] gpiolib: Unify the checks on fwnode type

On Tue, Mar 02, 2021 at 05:34:48PM +0200, Andy Shevchenko wrote:
> We have (historically) different approaches how we identify the type
> of a given fwnode. Let's standardize them across the library code.

This patch has one functional mistake (see below), otherwise I will anyway wait
for people to comment on the series.

> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/gpio/gpiolib.c | 28 +++++++++++++---------------
>  1 file changed, 13 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index adf55db080d8..484ac92903ab 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -3678,11 +3678,12 @@ EXPORT_SYMBOL_GPL(fwnode_gpiod_get_index);
>   */
>  int gpiod_count(struct device *dev, const char *con_id)
>  {
> +	const struct fwnode_handle *fwnode = dev_fwnode(dev);

It should be

	const struct fwnode_handle *fwnode = dev ? dev_fwnode(dev) : NULL;

>  	int count = -ENOENT;
>  
> -	if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node)
> +	if (is_of_node(fwnode))
>  		count = of_gpio_get_count(dev, con_id);
> -	else if (IS_ENABLED(CONFIG_ACPI) && dev && ACPI_HANDLE(dev))
> +	else if (is_acpi_node(fwnode))
>  		count = acpi_gpio_count(dev, con_id);
>  
>  	if (count < 0)
> @@ -3820,18 +3821,17 @@ struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
>  	int ret;
>  	/* Maybe we have a device name, maybe not */
>  	const char *devname = dev ? dev_name(dev) : "?";
> +	const struct fwnode_handle *fwnode = dev ? dev_fwnode(dev) : NULL;
>  
>  	dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id);
>  
> -	if (dev) {
> -		/* Using device tree? */
> -		if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
> -			dev_dbg(dev, "using device tree for GPIO lookup\n");
> -			desc = of_find_gpio(dev, con_id, idx, &lookupflags);
> -		} else if (ACPI_COMPANION(dev)) {
> -			dev_dbg(dev, "using ACPI for GPIO lookup\n");
> -			desc = acpi_find_gpio(dev, con_id, idx, &flags, &lookupflags);
> -		}
> +	/* Using device tree? */
> +	if (is_of_node(fwnode)) {
> +		dev_dbg(dev, "using device tree for GPIO lookup\n");
> +		desc = of_find_gpio(dev, con_id, idx, &lookupflags);
> +	} else if (is_acpi_node(fwnode)) {
> +		dev_dbg(dev, "using ACPI for GPIO lookup\n");
> +		desc = acpi_find_gpio(dev, con_id, idx, &flags, &lookupflags);
>  	}
>  
>  	/*
> @@ -3915,9 +3915,6 @@ struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
>  	struct gpio_desc *desc = ERR_PTR(-ENODEV);
>  	int ret;
>  
> -	if (!fwnode)
> -		return ERR_PTR(-EINVAL);
> -
>  	if (is_of_node(fwnode)) {
>  		desc = gpiod_get_from_of_node(to_of_node(fwnode),
>  					      propname, index,
> @@ -3933,7 +3930,8 @@ struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
>  
>  		acpi_gpio_update_gpiod_flags(&dflags, &info);
>  		acpi_gpio_update_gpiod_lookup_flags(&lflags, &info);
> -	}
> +	} else
> +		return ERR_PTR(-EINVAL);
>  
>  	/* Currently only ACPI takes this path */
>  	ret = gpiod_request(desc, label);
> -- 
> 2.30.1
> 

-- 
With Best Regards,
Andy Shevchenko