On Friday 06 November 2015 08:01:25 Moritz Fischer wrote:
> Hi Arnd,
>
> On Fri, Nov 6, 2015 at 12:54 AM, Arnd Bergmann <arnd@xxxxxxxx> wrote:
> > On Thursday 05 November 2015 15:41:23 Moritz Fischer wrote:
> >> +/* Pin names for the E31x usecase */
> >> +#define E31X_TX_BANDSEL_2 "DB_1"
> >> +#define E31X_RX1B_BANDSEL_0 "DB_3"
> >> +#define E31X_RX1B_BANDSEL_1 "DB_5"
> >> +#define E31X_VCTXRX2_V2 "DB_7"
> >> +#define E31X_TX_ENABLE1A "DB_9"
> >> +#define E31X_TX_ENABLE2A "DB_11"
> >> +#define E31X_TX_BANDSEL_0 "DB_12"
> >
> > Why not put the strings directly into the .dts files and change the
> > lookup table in the driver accordingly:
> >
> > +static const struct pinctrl_pin_desc e3xx_pins[] = {
> > + /* pin0 doesn't exist */
> > + PINCTRL_PIN(1, "TX_BANDSEL_2"),
> > + PINCTRL_PIN(3, "RX1B_BANDSEL_0"),
> > + PINCTRL_PIN(5, "RX1B_BANDSEL_1"),
> > + PINCTRL_PIN(7, "VCTXRX2_V2"),
>
> That's actually the way I initially had it, however the pin names
> literally changed
> in the schematic depending on which daughter-board you stick into the slot.
> So my plan was to add the #defines for the second daughter-board in a
> follow up patch
> once the pin assignment is final. This would allow me to have something like:
>
> pins = E31X_TX_BANDSEL_2;
> output-low;
>
> in one .dts, while having something like
>
> pins = E33X_TX_BANDSEL_2
> output low;
>
> in the second dts
That doesn't seem helpful though, because the assignment of the
pins is not hidden from the source file that should be documenting
it: if someone wants to know how the pins are muxed, they now have
to cross-reference the dts file with the header. If you just put the
pin number directly into the dts, it becomes completely clear
what the setting is.
> The other option would have been to stick a e31x_pins and a e33x_pins
> into the driver,
> and set them according to a compatible string or "ettus,daughterboard"
> property on probe.
>
> Does that make sense, or do you think there's a cleaner / better way
> to achieve this sort of behavior?
The driver should not be board specific.
Arnd
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