linux-kernel - Re: [PATCH v3 1/4] PCI: rockchip: Make 'ep-gpios' DT property optional

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Message-ID: <CAGb2v67qN9wQW9ddYu6VpGm+nid7Bws5i94mjkKqVncG28TYxA@mail.gmail.com>
Date:   Tue, 19 Jan 2021 17:15:45 +0800
From:   Chen-Yu Tsai <wens@...nel.org>
To:     Heiko Stübner <heiko@...ech.de>
Cc:     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>,
        Robin Murphy <robin.murphy@....com>,
        Johan Jonker <jbx6244@...il.com>,
        PCI <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 v3 1/4] PCI: rockchip: Make 'ep-gpios' DT property optional

On Tue, Jan 19, 2021 at 5:11 PM Heiko Stübner <heiko@...ech.de> wrote:
>
> Am Mittwoch, 6. Januar 2021, 14:46:14 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>
> > ---
> > Heiko, I dropped you reviewed-by due to the error message change
> >
> > Changes since v2:
> >   - Fix error message for failed GPIO
> >
> > 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 | 5 +++--
> >  1 file changed, 3 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/pci/controller/pcie-rockchip.c b/drivers/pci/controller/pcie-rockchip.c
> > index 904dec0d3a88..90c957e3bc73 100644
> > --- a/drivers/pci/controller/pcie-rockchip.c
> > +++ b/drivers/pci/controller/pcie-rockchip.c
> > @@ -118,9 +118,10 @@ 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");
> > +                     dev_err_probe(dev, PTR_ERR(rockchip->ep_gpio),
> > +                                   "failed to get ep GPIO\n");
> >                       return PTR_ERR(rockchip->ep_gpio);
>
> looking at [0] shouldn't that be just
>         return dev_err_probe(dev, PTR_ERR(.....)...);
> instead of dev_err_probe + additional return?

You're right. I was only expecting dev_err_probe() to deal with -EPROBE_DEFER.
I believe there won't be any future changes that would add any code here,
so I'll respin with the proper changes you mentioned.

Thanks!

ChenYu

> Heiko
>
> [0] https://elixir.bootlin.com/linux/latest/source/drivers/base/core.c#L4223
>
> >               }
> >       }
> >
>
>
>
>