linux-kernel - Re: [v2 PATCH] PCI: aardvark: switch to using devm_gpiod_get

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Date:   Tue, 15 Nov 2022 19:00:14 +0100
From:   Pali Rohár <pali@...nel.org>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [v2 PATCH] PCI: aardvark: switch to using
 devm_gpiod_get_optional()

On Monday 14 November 2022 10:42:25 Dmitry Torokhov wrote:
> Switch the driver to the generic version of gpiod API (and away from
> OF-specific variant), so that we can stop exporting
> devm_gpiod_get_from_of_node().
> 
> Acked-by: Pali Rohár <pali@...nel.org>
> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> ---
> 
> v2:
>  - collected reviewed-by/acked-by tags
>  - updated commit description to remove incorrect assumption of why
>    devm_gpiod_get_from_of_node() was used in the first place
> 
> This is the last user of devm_gpiod_get_from_of_node() in the mainline
> (next), it would be great to have it in so that we can remove the API in
> the next release cycle.
> 
> Thanks!

Just a note that more aardvark patches are waiting on the list.

> 
>  drivers/pci/controller/pci-aardvark.c | 23 +++++++++++------------
>  1 file changed, 11 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
> index ba36bbc5897d..5ecfac23c9fc 100644
> --- a/drivers/pci/controller/pci-aardvark.c
> +++ b/drivers/pci/controller/pci-aardvark.c
> @@ -1859,20 +1859,19 @@ 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);
> -- 
> 2.38.1.431.g37b22c650d-goog
> 
> 
> -- 
> Dmitry