Hi Gerd,
> Stefan Wahren <stefan.wahren@xxxxxxxx> hat am 12. September 2016 um 20:19
> geschrieben:
>
>
> Hi Gerd,
>
> > Gerd Hoffmann <kraxel@xxxxxxxxxx> hat am 12. September 2016 um 10:22
> > geschrieben:
> >
> >
> > From: Eric Anholt <eric@xxxxxxxxxx>
> >
> > The BCM2835-ARM-Peripherals.pdf documentation specifies what the
> > function selects do for the pins, and there are a bunch of obvious
> > groupings to be made. With these created, we'll be able to replace
> > bcm2835-rpi.dtsi's main "set all of these pins to alt0" with
> > references to specific groups we want enabled.
> >
> > Signed-off-by: Eric Anholt <eric@xxxxxxxxxx>
> >
> > squashed in:
> > ARM: dts: bcm283x: Add the emmc pin group to bcm283x.dtsi.
> > ARM: dts: bcm283x: Add a group for mapping pins 48-53 to sdhost.
> > ARM: dts: bcm283x: Add a new EMMC pin group from the downstream tree.
> >
> > fixups by kraxel:
> > * fix spi0 name
> > * sort & group entries
> > * use pull defines
> > * add dpi group
>
> this looks like a changelog. Please move this at the proper place before the
> first "diff" and specify the version.
>
> >
> > Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
> > ---
> > arch/arm/boot/dts/bcm283x.dtsi | 203
> > +++++++++++++++++++++++++++++++++++++++++
> > 1 file changed, 203 insertions(+)
> >
> > diff --git a/arch/arm/boot/dts/bcm283x.dtsi b/arch/arm/boot/dts/bcm283x.dtsi
> > index 4d9f3ab..7b03b63 100644
> > --- a/arch/arm/boot/dts/bcm283x.dtsi
> > +++ b/arch/arm/boot/dts/bcm283x.dtsi
> > @@ -131,6 +131,209 @@
> >
> > interrupt-controller;
> > #interrupt-cells = <2>;
> > +
> > + /* Defines pin muxing groups according to
> > + * BCM2835-ARM-Peripherals.pdf page 102.
> > + *
> > + * While each pin can have its mux selected
> > + * for various functions individually, some
> > + * groups only make sense to switch to a
> > + * particular function together.
> > + */
> > + dpi_gpio4: dpi_gpio4 {
> > + brcm,pins = <0 1 2 3 4 5 6 7 8 9 10 11
> > + 12 13 14 15 16 17 18 19
> > + 20 21 22 23 24 25 26 27>;
> > + brcm,function = <BCM2835_FSEL_ALT2>;
> > + };
>
> s/dpi_gpio4/dpi_gpio0
>
> > + emmc_gpio22: emmc_gpio22 {
> > + brcm,pins = <22 23 24 25 26 27>;
> > + brcm,function = <BCM2835_FSEL_ALT3>;
> > + };
> > + emmc_gpio34: emmc_gpio34 {
> > + brcm,pins = <34 35 36 37 38 39>;
> > + brcm,function = <BCM2835_FSEL_ALT3>;
> > + brcm,pull = <BCM2835_PUD_OFF
> > + BCM2835_PUD_UP
> > + BCM2835_PUD_UP
> > + BCM2835_PUD_UP
> > + BCM2835_PUD_UP
> > + BCM2835_PUD_UP>;
> > + };
> > + emmc_gpio48: emmc_gpio48 {
> > + brcm,pins = <48 49 50 51 52 53>;
> > + brcm,function = <BCM2835_FSEL_ALT3>;
> > + };
>
> Sorry, i didn't notice this before. The naming of these groups suggest 3 muxes
> for the same eMMC interface. I thought there is a eMMC interface and a SD host
> interface with different DMA channels.
>
> > +
> > ...
> > +
> > + sdhost_gpio48: sdhost_gpio48 {
> > + brcm,pins = <48 49 50 51 52 53>;
> > + brcm,function = <BCM2835_FSEL_ALT0>;
> > + };
>
> I think this incorrect. There is no function ALT0 for these pins, only ALT3.
please forget my last 2 comments. According to this page [1] eMMC is selected by
ALT3 and sdhost is selected by ALT0.
Do you know a reliable source where all muxes for both interface are documented?
The datasheet isn't very helpful here.
Regards
Stefan
[1] - http://pinout.xyz/pinout/sdio
>
> Regards
> Stefan
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