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[v4,1/4] PCI: rockchip: Make 'ep-gpios' DT property optional

Message ID 20210121162321.4538-2-wens@kernel.org (mailing list archive)
State New
Headers show
Series arm64: rockchip: Fix PCIe ep-gpios requirement and Add Nanopi M4B | expand

Commit Message

Chen-Yu Tsai Jan. 21, 2021, 4:23 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>
---

Changes since v3:
  - Directly return dev_err_probe() instead of having a separate return
    statement

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 | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)
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Patch

diff --git a/drivers/pci/controller/pcie-rockchip.c b/drivers/pci/controller/pcie-rockchip.c
index 904dec0d3a88..a2ad0b7614a4 100644
--- a/drivers/pci/controller/pcie-rockchip.c
+++ b/drivers/pci/controller/pcie-rockchip.c
@@ -118,11 +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);
-		if (IS_ERR(rockchip->ep_gpio)) {
-			dev_err(dev, "missing ep-gpios property in node\n");
-			return PTR_ERR(rockchip->ep_gpio);
-		}
+		rockchip->ep_gpio = devm_gpiod_get_optional(dev, "ep", GPIOD_OUT_HIGH);
+		if (IS_ERR(rockchip->ep_gpio))
+			return dev_err_probe(dev, PTR_ERR(rockchip->ep_gpio),
+					     "failed to get ep GPIO\n");
 	}
 
 	rockchip->aclk_pcie = devm_clk_get(dev, "aclk");