linux-kernel - Re: [PATCH 1/4] PCI: rockchip: make ep

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Date:   Tue, 17 Nov 2020 11:45:09 +0800
From:   Chen-Yu Tsai <wens@...nel.org>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Chen-Yu Tsai <wens@...nel.org>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Robin Murphy <robin.murphy@....com>,
        Johan Jonker <jbx6244@...il.com>, linux-pci@...r.kernel.org,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/4] PCI: rockchip: make ep_gpio optional

On Tue, Nov 17, 2020 at 12:42 AM Bjorn Helgaas <helgaas@...nel.org> wrote:
>
> Run "git log --oneline drivers/pci/controller/pcie-rockchip.c" (or
> even just look at the Fixes: commits you mention) and follow the
> convention, e.g.,
>
>   PCI: rockchip: Make 'ep-gpios' DT property optional
>
> Also, you used 'ep_gpio' (singular, with an underline) in the subject
> but 'ep-gpios' (plural, with hyphen) in the commit log.  The error
> message and Documentation/devicetree/bindings/pci/rockchip-pcie-host.txt
> both say 'ep-gpios' (plural, with hyphen).

'ep_gpio' refers to the variable used within the driver. But reading it
again, it does seem kind of weird. I will rewrite it to be more consistent.

ChenYu

> Please fix so this is all consistent.  Details matter.
>
> On Mon, Nov 16, 2020 at 03:52:12PM +0800, Chen-Yu Tsai wrote:
> > 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>
> > ---
> >  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);
> > --
> > 2.29.1
> >