linux-kernel - Re: [PATCH v4 4/4] staging: greybus: arche-platform: Switch to the gpio descriptor interface

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Date:   Wed, 9 Jan 2019 12:35:47 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Nishad Kamdar <nishadkamdar@...il.com>
Cc:     Johan Hovold <johan@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alex Elder <elder@...nel.org>,
        Rui Miguel Silva <rmfrfs@...il.com>,
        greybus-dev@...ts.linaro.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 4/4] staging: greybus: arche-platform: Switch to the
 gpio descriptor interface

On Sat, Dec 22, 2018 at 08:23:02PM +0530, Nishad Kamdar wrote:
> Use the gpiod interface instead of the deprecated
> old non-descriptor interface.
> 
> Signed-off-by: Nishad Kamdar <nishadkamdar@...il.com>
> ---
> Changes in v4:
>  - Move 'gpio_desc *svc_sysboot' below the reset flag
>    as it is more logical to have reset flag below
>    reset gpio.
>  - Remove a few unnecessary line breaks.
> Changes in v3:
>  - Add this patch to a patchset.
> Changes in v2:
>  - Move comment to the same line as to what it applies to.
> ---

> -static inline void svc_reset_onoff(unsigned int gpio, bool onoff)
> +static inline void svc_reset_onoff(struct gpio_desc *gpio, bool onoff)
>  {
> -	gpio_set_value(gpio, onoff);
> +	gpiod_set_value(gpio, onoff);
>  }

Please use the raw interface here too, until we've done away with the
polarity properties and can honour the generic device tree flags. Please
make a comment about this in the commit message too.

> @@ -444,61 +438,33 @@ static int arche_platform_probe(struct platform_device *pdev)
>  	/* setup svc reset gpio */
>  	arche_pdata->is_reset_act_hi = of_property_read_bool(np,
>  							     "svc,reset-active-high");
> -	arche_pdata->svc_reset_gpio = of_get_named_gpio(np,
> -							"svc,reset-gpio",
> -							0);
> -	if (!gpio_is_valid(arche_pdata->svc_reset_gpio)) {
> -		dev_err(dev, "failed to get reset-gpio\n");
> -		return arche_pdata->svc_reset_gpio;
> -	}
> -	ret = devm_gpio_request(dev, arche_pdata->svc_reset_gpio, "svc-reset");
> -	if (ret) {
> -		dev_err(dev, "failed to request svc-reset gpio:%d\n", ret);
> -		return ret;
> -	}
> -	ret = gpio_direction_output(arche_pdata->svc_reset_gpio,
> -				    arche_pdata->is_reset_act_hi);
> -	if (ret) {
> -		dev_err(dev, "failed to set svc-reset gpio dir:%d\n", ret);
> +	if (arche_pdata->is_reset_act_hi)
> +		flags = GPIOD_OUT_HIGH;
> +	else
> +		flags = GPIOD_OUT_LOW;
> +
> +	arche_pdata->svc_reset = devm_gpiod_get(dev, "svc,reset-gpio", flags);

Again, you cannot just rename devicetree properties like this. Keep the
current names for now (and drop the -gpio suffix when requesting).

Johan