On Wed, Sep 30, 2020 at 2:15 AM Tony Lindgren <tony@xxxxxxxxxxx> wrote:
>
> * Trent Piepho <tpiepho@xxxxxxxxx> [200930 08:35]:
> > The closest thing would be the generic pin config type bindings, which
> > go in the pinctrl driver's nodes, and look like this:
> > &am335x_pinmux {
> > pinctrl_yoyo_reset: yoyogrp {
> > pins = "foo";
> > function = "gpio";
> > bias-pull-up;
> > };
> > };
>
> There's a bit of a dtb size and boot time issue for adding properties
> for each pin where that needs to be done for several hundred pins :)
pins is list, multiple pins can be specified at once. Otherwise the
property name would be "pin" and not "pins" There's also a groups
property to refer to multiple pins at once, e.g.
arch/mips/boot/dts/ingenic/ci20.dts- pins_mmc1: mmc1 {
arch/mips/boot/dts/ingenic/ci20.dts- function = "mmc1";
arch/mips/boot/dts/ingenic/ci20.dts: groups =
"mmc1-1bit-d", "mmc1-4bit-d";
arch/mips/boot/dts/ingenic/ci20.dts- bias-disable;
arch/mips/boot/dts/ingenic/ci20.dts- };
arch/mips/boot/dts/pic32/pic32mzda_sk.dts- user_leds_s0: user_leds_s0 {
arch/mips/boot/dts/pic32/pic32mzda_sk.dts: pins = "H0", "H1", "H2";
arch/mips/boot/dts/pic32/pic32mzda_sk.dts- output-low;
arch/mips/boot/dts/pic32/pic32mzda_sk.dts- microchip,digital;
arch/mips/boot/dts/pic32/pic32mzda_sk.dts- };
> > Is "some additional property for specifying generic conf flags"
> > different from the existing pinctrl-single,bias-pullup, etc.
> > properties? Because splitting the data cell into two parts doesn't
> > make any difference to those.
>
> So with an interrupt style binding with generic pinconf flags we can
> leave out the parsing of multiple properties for each pin. Sure the
> pin is only referenced by the controller like you pointed out but the
> pinconf flags could be generic.
Where do these flags go? In pinctrl-single,pins? Like:
pinctrl-single,pins = <AM335X_PIN_MDC MUX_MODE7 PIN_INPUT_PULLUP>;
But PIN_INPUT_PULLUP is a generic flag? Which is translated into the
proper value by??
Or are you talking about replacing the existing pinctrl-0,
pinctrl-names properties with a totally different system that looks
more like gpio and interrupt handles?
