linux-kernel - Re: [PATCH v2 1/4] PCI: rockchip: Make 'ep-gpios' DT property optional

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Date:   Wed, 18 Nov 2020 09:49:40 +0100
From:   Heiko Stübner <heiko@...ech.de>
To:     Shawn Lin <shawn.lin@...k-chips.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Chen-Yu Tsai <wens@...nel.org>
Cc:     Chen-Yu Tsai <wens@...e.org>, Robin Murphy <robin.murphy@....com>,
        Johan Jonker <jbx6244@...il.com>, linux-pci@...r.kernel.org,
        linux-rockchip@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v2 1/4] PCI: rockchip: Make 'ep-gpios' DT property optional

Am Mittwoch, 18. November 2020, 08:17:21 CET schrieb Chen-Yu Tsai:
> From: Chen-Yu Tsai <wens@...e.org>
> 
> The Rockchip PCIe controller DT binding clearly states that 'ep-gpios' is
> an optional property. And indeed there are boards that don't require it.
> 
> Make the driver follow the binding by using devm_gpiod_get_optional()
> instead of devm_gpiod_get().
> 
> Fixes: e77f847df54c ("PCI: rockchip: Add Rockchip PCIe controller support")
> Fixes: 956cd99b35a8 ("PCI: rockchip: Separate common code from RC driver")
> Fixes: 964bac9455be ("PCI: rockchip: Split out rockchip_pcie_parse_dt() to parse DT")
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>

Reviewed-by: Heiko Stuebner <heiko@...ech.de


I'll pick up patches 2-4 separately, after giving Rob a chance to look at
the simple binding.


Heiko

> ---
> Changes since v1:
> 
>   - Rewrite subject to match existing convention and reference
>     'ep-gpios' DT property instead of the 'ep_gpio' field
> ---
>  drivers/pci/controller/pcie-rockchip.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/pcie-rockchip.c b/drivers/pci/controller/pcie-rockchip.c
> index 904dec0d3a88..c95950e9004f 100644
> --- a/drivers/pci/controller/pcie-rockchip.c
> +++ b/drivers/pci/controller/pcie-rockchip.c
> @@ -118,7 +118,7 @@ int rockchip_pcie_parse_dt(struct rockchip_pcie *rockchip)
>  	}
>  
>  	if (rockchip->is_rc) {
> -		rockchip->ep_gpio = devm_gpiod_get(dev, "ep", GPIOD_OUT_HIGH);
> +		rockchip->ep_gpio = devm_gpiod_get_optional(dev, "ep", GPIOD_OUT_HIGH);
>  		if (IS_ERR(rockchip->ep_gpio)) {
>  			dev_err(dev, "missing ep-gpios property in node\n");
>  			return PTR_ERR(rockchip->ep_gpio);
>