On Tue, Nov 17, 2020 at 12:42 AM Bjorn Helgaas [off-list ref] 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:

quoted

From: Chen-Yu Tsai <redacted>

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 <redacted>
---
 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