ARM: dts: sun5i: Add port E pinmux settings for mmc2

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>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/7949169f581cab37175602188f44bc26e79a45c0.1683719613.git.noodles@earth.li
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>

diff --git a/arch/arm/boot/dts/sun5i.dtsi b/arch/arm/boot/dts/sun5i.dtsi
index 2f901a01367636a2531ca6ae119772e1d98608c9..d7c7b454a11a3541df97d53a7af3f23f6689ef08 100644 (file)
--- a/arch/arm/boot/dts/sun5i.dtsi
+++ b/arch/arm/boot/dts/sun5i.dtsi
@@ -517,6 +517,15 @@
                                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",