The function_is_gpio pinmux op allows the core to find out whether a
GPIO can be safely requested from a pinctrl property and requested as a
GPIO at the same time.
This is especially useful to request a GPIO with a particular drive
strength, which would otherwise not be possible.
Signed-off-by: Paul Kocialkowski <paulk@sys-base.io>
---
drivers/pinctrl/sunxi/pinctrl-sunxi.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/pinctrl/sunxi/pinctrl-sunxi.c b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
index d3042e0c9712..6162f2d86723 100644
--- a/drivers/pinctrl/sunxi/pinctrl-sunxi.c
+++ b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
@@ -821,6 +821,17 @@ static int sunxi_pmx_get_func_groups(struct pinctrl_dev *pctldev,
return 0;
}
+static bool sunxi_pmx_function_is_gpio(struct pinctrl_dev *pctldev,
+ unsigned function)
+{
+ struct sunxi_pinctrl *pctl = pinctrl_dev_get_drvdata(pctldev);
+
+ if (!strncmp(pctl->functions[function].name, "gpio", 4))
+ return true;
+
+ return false;
+}
+
static void sunxi_pmx_set(struct pinctrl_dev *pctldev,
unsigned pin,
u8 config)
@@ -952,6 +963,7 @@ static const struct pinmux_ops sunxi_pmx_ops = {
.get_functions_count = sunxi_pmx_get_funcs_cnt,
.get_function_name = sunxi_pmx_get_func_name,
.get_function_groups = sunxi_pmx_get_func_groups,
+ .function_is_gpio = sunxi_pmx_function_is_gpio,
.set_mux = sunxi_pmx_set_mux,
.gpio_set_direction = sunxi_pmx_gpio_set_direction,
.request = sunxi_pmx_request,
--
2.54.0