diff mbox series

[v3,1/4] PCI: rockchip: Make 'ep-gpios' DT property optional

Message ID 20210106134617.391-2-wens@kernel.org (mailing list archive)
State New, archived
Headers show
Series arm64: rockchip: Fix PCIe ep-gpios requirement and Add Nanopi M4B | expand

Commit Message

Chen-Yu Tsai Jan. 6, 2021, 1:46 p.m. UTC
From: Chen-Yu Tsai <wens@csie.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@csie.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(-)

Comments

Heiko Stuebner Jan. 19, 2021, 9:11 a.m. UTC | #1
Am Mittwoch, 6. Januar 2021, 14:46:14 CET schrieb Chen-Yu Tsai:
> From: Chen-Yu Tsai <wens@csie.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@csie.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?

Heiko

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

>  		}
>  	}
>
Chen-Yu Tsai Jan. 19, 2021, 9:15 a.m. UTC | #2
On Tue, Jan 19, 2021 at 5:11 PM Heiko Stübner <heiko@sntech.de> wrote:
>
> Am Mittwoch, 6. Januar 2021, 14:46:14 CET schrieb Chen-Yu Tsai:
> > From: Chen-Yu Tsai <wens@csie.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@csie.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
>
> >               }
> >       }
> >
>
>
>
>
diff mbox series

Patch

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);
 		}
 	}