Messages in this thread | | | Date | Wed, 18 Mar 2015 18:00:04 +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 05:51 PM, Lee Jones wrote: > 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? Just re-checked the code, and yes you are right. No alt here means alt field of struct st_pctl_data is -1, which in turn means the register is not available.
You can forget my remark, and add my: Acked-by: Maxime Coquelin <maxime.coquelin@st.com>
Thanks, Maxime
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