On Thu, Sep 27, 2018 at 05:15:54PM +0200, Geert Uytterhoeven wrote:
> On Thu, Sep 27, 2018 at 3:59 PM Phil Edworthy <phil.edworthy@xxxxxxxxxxx> wrote:
> > The Renesas RZ/N1 device family PINCTRL node description.
> >
> > Based on a patch originally written by Michel Pollet at Renesas.
> >
> > Signed-off-by: Phil Edworthy <phil.edworthy@xxxxxxxxxxx>
> > Reviewed-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx>
> > ---
> > v6:
> > - Instead of combining the pin nr and func into a single element, use
> > a pair of 8-bit elements.
>
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/pinctrl/renesas,rzn1-pinctrl.txt
>
> > +- Pin multiplexing sub-nodes:
> > + A pin multiplexing sub-node describes how to configure a set of
> > + (or a single) pin in some desired alternate function mode.
> > + A single sub-node may define several pin configurations.
> > + Please refer to pinctrl-bindings.txt to get to know more on generic
> > + pin properties usage.
> > +
> > + The allowed generic formats for a pin multiplexing sub-node are the
> > + following ones:
> > +
> > + node-1 {
> > + pinmux = /bits/ 8 <PIN_NR MUX_FUNC>, <PIN_NR MUX_FUNC>, ... ;
> > + GENERIC_PINCONFIG;
> > + };
>
> and
>
> > + Example:
> > + A serial communication interface with a TX output pin and an RX input pin.
> > +
> > + &pinctrl {
> > + pins_uart0: pins_uart0 {
> > + pinmux = /bits/ 8 <
> > + 103 RZN1_FUNC_UART0_I /* UART0_TXD */
> > + 104 RZN1_FUNC_UART0_I /* UART0_RXD */
> > + >;
> > + };
> > + };
>
> So the above is in response to Rob's comment on v4:
>
> | > +#define RZN1_MUX(_gpio, _func) \
> | > + (((RZN1_FUNC_##_func) << 8) | (_gpio))
> |
> | I'm not a fan of token pasting and it also goes against kernel style.
> | If every other Renesas platform is doing this, then fine. Otherwise,
> | you can express it in pretty much the same (source) space:
> |
> | pinmux = <RZN1_MUX_UART0_I 104>;
> |
> | Yes, this is 2 cells instead of 1, but if you care about space, you
> | can use 8 or 16 bit size.
>
> I'm not so much impressed by the "/bits/ 8" part.
> No other pinctrl bindings uses this.
> We do have RZA1_PINMUX() and STM32_PINMUX() macros.
Yes, but those aren't doing token pasting which was my complaint here.
> Rob: Is this really what you intended?
Do whatever is most consistant. If you want a macro to shift fields,
then fine.
Rob
