| Message ID | 1426675899-19882-3-git-send-email-lee.jones@linaro.org |
|---|---|
| State | New |
| Headers | show |
On Wed, 18 Mar 2015, Maxime Coquelin wrote: > > > On 03/18/2015 11:51 AM, Lee Jones wrote: > >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. > > > >Signed-off-by: Lee Jones <lee.jones@linaro.org> > >--- > > drivers/pinctrl/pinctrl-st.c | 14 ++++++++++++++ > > 1 file changed, 14 insertions(+) > > > >diff --git a/drivers/pinctrl/pinctrl-st.c b/drivers/pinctrl/pinctrl-st.c > >index 9e5ec00..5362e45 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; > Shouldn't we print something if alt is NULL? > Else we can think we are on alternate 0. That is the assumption that I've made. Is there isn't an alt, then a pin can only be on Alt-0. Have I made the incorrect assumption here? > >+ > >+ 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) > > { >
diff --git a/drivers/pinctrl/pinctrl-st.c b/drivers/pinctrl/pinctrl-st.c index 9e5ec00..5362e45 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) {
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. Signed-off-by: Lee Jones <lee.jones@linaro.org> --- drivers/pinctrl/pinctrl-st.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)