Insteaf of the MSM DRM code going around and inspecting the
device tree nodes by itself to find "qcom,misc" GPIO phandles,
we add a quirk to the core so that if "qcom,misc-gpios" and
"qcom,misc-gpio" isn't found, we try to find just
"qcom,misc" as a last resort. Provide an explicit whitelist
for those GPIOs.
Cc: Rob Clark <robdcl...@gmail.com>
Cc: Sean Paul <s...@poorly.run>
Cc: linux-arm-...@vger.kernel.org
Cc: freedr...@lists.freedesktop.org
Signed-off-by: Linus Walleij <linus.wall...@linaro.org>
---
Rob/Sean: if the approach is overall OK I will merge this
one patch already for v5.3 so the rest can be queued for
v5.4 later.
---
drivers/gpio/gpiolib-of.c | 43 +++++++++++++++++++++++++++++++++++++++
1 file changed, 43 insertions(+)
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index aec7bd86ae7e..c927eaf6c88f 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -286,6 +286,45 @@ static struct gpio_desc *of_find_regulator_gpio(struct
device *dev, const char *
return desc;
}
+/*
+ * Some non-standard Qualcomm HDMI GPIOs need to be supported as they exist
+ * in random old device trees out there.
+ */
+static struct gpio_desc *of_find_hdmi_gpio(struct device *dev,
+ const char *con_id,
+ enum of_gpio_flags *of_flags)
+{
+ /*
+ * These are the connection IDs we accept as legacy GPIO phandles.
+ * If we get here, the same prefix ending with "-gpio" and "-gpios"
+ * has already been tried so now we finally try with no suffix.
+ */
+ const char *whitelist[] = {
+ "qcom,hdmi-tx-ddc-clk",
+ "qcom,hdmi-tx-ddc-data",
+ "qcom,hdmi-tx-hpd",
+ "qcom,hdmi-tx-mux-en",
+ "qcom,hdmi-tx-mux-sel",
+ "qcom,hdmi-tx-mux-lpm",
+ };
+ struct device_node *np = dev->of_node;
+ struct gpio_desc *desc;
+ int i;
+
+ if (!IS_ENABLED(CONFIG_DRM_MSM))
+ return ERR_PTR(-ENOENT);
+
+ if (!con_id)
+ return ERR_PTR(-ENOENT);
+
+ i = match_string(whitelist, ARRAY_SIZE(whitelist), con_id);
+ if (i < 0)
+ return ERR_PTR(-ENOENT);
+
+ desc = of_get_named_gpiod_flags(np, con_id, 0, of_flags);
+ return desc;
+}
+
struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id,
unsigned int idx, unsigned long *flags)
{
@@ -330,6 +369,10 @@ struct gpio_desc *of_find_gpio(struct device *dev, const
char *con_id,
if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER)
desc = of_find_regulator_gpio(dev, con_id, &of_flags);
+ /* Special handling for HDMI GPIOs if used */
+ if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER)
+ desc = of_find_hdmi_gpio(dev, con_id, &of_flags);
+
if (IS_ERR(desc))
return desc;
--
2.20.1
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