Messages in this thread | ![/](/images/icornerl.gif) | | Date | Wed, 18 Mar 2015 17:41:15 +0100 | From | Maxime Coquelin <> | Subject | Re: [STLinux Kernel] [PATCH 2/6] pinctrl: st: Introduce a 'get pin function' call |
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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.
> + > + 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) > {
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