| Message ID | 00d37ef9bf70785d05fb446ee6d0060c4a8d521a.1681580558.git.noodles@earth.li |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Minor device-tree additions for C.H.I.P | expand |
On Sun, Apr 16, 2023 at 01:47:56AM +0100, Andre Przywara wrote: > On Sat, 15 Apr 2023 18:46:24 +0100 > Jonathan McDowell <noodles@earth.li> wrote: > > Hi, > > > These alternate pins for mmc2 are brought out to the 40 pin U14 header > > on the C.H.I.P and can be used to add an external MMC device with a 4 > > bit interface. See > > > > https://byteporter.com/ntc-chip-micro-sd-slot/ > > > > for further details on how. > > > > Signed-off-by: Jonathan McDowell <noodles@earth.li> > > --- > > arch/arm/boot/dts/sun5i.dtsi | 8 ++++++++ > > 1 file changed, 8 insertions(+) > > > > diff --git a/arch/arm/boot/dts/sun5i.dtsi b/arch/arm/boot/dts/sun5i.dtsi > > index 250d6b87ab4d..e4922506ce22 100644 > > --- a/arch/arm/boot/dts/sun5i.dtsi > > +++ b/arch/arm/boot/dts/sun5i.dtsi > > @@ -517,6 +517,14 @@ mmc2_4bit_pc_pins: mmc2-4bit-pc-pins { > > bias-pull-up; > > }; > > > > As this seems to be a highly non-standard and rare modification, that > doesn't even get used in the mainline DT, please add a: > /omit-if-no-ref/ > line, so we don't get this into every sun5i board. Neat, will add in v2. > Otherwise looks good, though I don't know if that should belong into > the same DT overlay that is probably used to also enable the MMC2 node. I pondered that, but we already have the mmc2-4bit-pc-pins definition here so it seemed helpful to add the pe-pins too. > > + mmc2_4bit_pe_pins: mmc2-4bit-pe-pins { > > + pins = "PE4", "PE5", "PE6", "PE7", > > + "PE8", "PE9"; > > + function = "mmc2"; > > + drive-strength = <30>; > > + bias-pull-up; > > + }; > > + > > mmc2_8bit_pins: mmc2-8bit-pins { > > pins = "PC6", "PC7", "PC8", "PC9", > > "PC10", "PC11", "PC12", "PC13", > J.
diff --git a/arch/arm/boot/dts/sun5i.dtsi b/arch/arm/boot/dts/sun5i.dtsi index 250d6b87ab4d..e4922506ce22 100644 --- a/arch/arm/boot/dts/sun5i.dtsi +++ b/arch/arm/boot/dts/sun5i.dtsi @@ -517,6 +517,14 @@ mmc2_4bit_pc_pins: mmc2-4bit-pc-pins { bias-pull-up; }; + mmc2_4bit_pe_pins: mmc2-4bit-pe-pins { + pins = "PE4", "PE5", "PE6", "PE7", + "PE8", "PE9"; + function = "mmc2"; + drive-strength = <30>; + bias-pull-up; + }; + mmc2_8bit_pins: mmc2-8bit-pins { pins = "PC6", "PC7", "PC8", "PC9", "PC10", "PC11", "PC12", "PC13",
These alternate pins for mmc2 are brought out to the 40 pin U14 header on the C.H.I.P and can be used to add an external MMC device with a 4 bit interface. See https://byteporter.com/ntc-chip-micro-sd-slot/ for further details on how. Signed-off-by: Jonathan McDowell <noodles@earth.li> --- arch/arm/boot/dts/sun5i.dtsi | 8 ++++++++ 1 file changed, 8 insertions(+)