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 | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/arch/arm/boot/dts/sun5i.dtsi b/arch/arm/boot/dts/sun5i.dtsi
index 250d6b87ab4d..ab7f675aeec4 100644
--- a/arch/arm/boot/dts/sun5i.dtsi
+++ b/arch/arm/boot/dts/sun5i.dtsi
@@ -517,6 +517,15 @@ mmc2_4bit_pc_pins: mmc2-4bit-pc-pins {
bias-pull-up;
};
+ /omit-if-no-ref/
+ 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",
--
2.39.2