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Date:   Mon, 5 Sep 2022 09:00:46 +0200
From:   Pali =?utf-8?B?Um9ow6Fy?= <pali@kernel.org>
To:     Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc:     Thierry Reding <thierry.reding@gmail.com>,
        Mark Brown <broonie@kernel.org>,
        Matti Vaittinen <mazziesaccount@gmail.com>,
        Lorenzo Pieralisi <lpieralisi@kernel.org>,
        Claudiu Beznea <claudiu.beznea@microchip.com>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Wim Van Sebroeck <wim@linux-watchdog.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Guenter Roeck <linux@roeck-us.net>,
        Miquel Raynal <miquel.raynal@bootlin.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        Felipe Balbi <balbi@kernel.org>,
        Alexandre Belloni <alexandre.belloni@bootlin.com>,
        Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= <kw@linux.com>,
        Vignesh Raghavendra <vigneshr@ti.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
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Subject: Re: [PATCH v1 06/11] PCI: aardvark: switch to using
 devm_gpiod_get_optional()
Message-ID: <20220905070046.46nlhczkck2ufr4x@pali>
References: <20220903-gpiod_get_from_of_node-remove-v1-0-b29adfb27a6c@gmail.com>
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On Sunday 04 September 2022 23:30:58 Dmitry Torokhov wrote:
> I would like to stop exporting OF-specific devm_gpiod_get_from_of_node()
> so that gpiolib can be cleaned a bit, so let's switch to the generic
> device property API.
> 
> I believe that the only reason the driver, instead of the standard
> devm_gpiod_get_optional(), used devm_gpiod_get_from_of_node() is
> because it wanted to set up a pretty consumer name for the GPIO,

IIRC consumer name is not used at all.

The reason was to specify full name of DTS property, for easier
identification of the code. DTS property is "reset-gpios" but API
specify only "reset".

> and we now have a special API for that.
> 
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
> 
> diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
> index 4834198cc86b..4a8a4a8522cb 100644
> --- a/drivers/pci/controller/pci-aardvark.c
> +++ b/drivers/pci/controller/pci-aardvark.c
> @@ -1856,20 +1856,19 @@ static int advk_pcie_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>  
> -	pcie->reset_gpio = devm_gpiod_get_from_of_node(dev, dev->of_node,
> -						       "reset-gpios", 0,
> -						       GPIOD_OUT_LOW,
> -						       "pcie1-reset");
> +	pcie->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
>  	ret = PTR_ERR_OR_ZERO(pcie->reset_gpio);
>  	if (ret) {
> -		if (ret == -ENOENT) {
> -			pcie->reset_gpio = NULL;
> -		} else {
> -			if (ret != -EPROBE_DEFER)
> -				dev_err(dev, "Failed to get reset-gpio: %i\n",
> -					ret);
> -			return ret;
> -		}
> +		if (ret != -EPROBE_DEFER)
> +			dev_err(dev, "Failed to get reset-gpio: %i\n",
> +				ret);
> +		return ret;
> +	}
> +
> +	ret = gpiod_set_consumer_name(pcie->reset_gpio, "pcie1-reset");
> +	if (ret) {
> +		dev_err(dev, "Failed to set reset gpio name: %d\n", ret);
> +		return ret;
>  	}
>  
>  	ret = of_pci_get_max_link_speed(dev->of_node);
> 
> -- 
> b4 0.10.0-dev-fc921