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authorLee Jones <lee.jones@linaro.org>2015-03-18 17:21:15 +0000
committerLinus Walleij <linus.walleij@linaro.org>2015-03-25 16:35:10 +0100
commitc2a4bf47089823bb76d2498eebda922ecf99546d (patch)
tree2156c819cb6af78e12b7cee8a13d780a2fc0bdbf /drivers/pinctrl/pinctrl-st.c
parente4c02dced975cbb3e7cb097a0895ce0143b3386a (diff)
downloadlwn-c2a4bf47089823bb76d2498eebda922ecf99546d.tar.gz
lwn-c2a4bf47089823bb76d2498eebda922ecf99546d.zip
pinctrl: st: Introduce a 'get pin function' call
This call fetches the numerical function value a specified pin is currently operating in. Function zero is more often than not the GPIO function. Greater than zero values represent an alternative function. You'd need to either look those up in the Device Tree sources or the Programmer's Manual. Acked-by: Maxime Coquelin <maxime.coquelin@st.com> Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl/pinctrl-st.c')
-rw-r--r--drivers/pinctrl/pinctrl-st.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-st.c b/drivers/pinctrl/pinctrl-st.c
index 9e5ec00084bb..5362e45e8cd5 100644
--- a/drivers/pinctrl/pinctrl-st.c
+++ b/drivers/pinctrl/pinctrl-st.c
@@ -460,6 +460,20 @@ static void st_pctl_set_function(struct st_pio_control *pc,
regmap_field_write(alt, val);
}
+static unsigned int st_pctl_get_pin_function(struct st_pio_control *pc, int pin)
+{
+ struct regmap_field *alt = pc->alt;
+ unsigned int val;
+ int offset = pin * 4;
+
+ if (!alt)
+ return 0;
+
+ regmap_field_read(alt, &val);
+
+ return (val >> offset) & 0xf;
+}
+
static unsigned long st_pinconf_delay_to_bit(unsigned int delay,
const struct st_pctl_data *data, unsigned long config)
{