ARM: dts: sun6i: Add mmc3 pins for 8 bit emmc

mmc2 and mmc3 are available on the same pins, with different mux values.
However, only mmc3 supports 8 bit DDR transfer modes.

Since preference for mmc3 over mmc2 is due to DDR transfer modes, just
set the drive strength to 40mA, which is needed for DDR.

This pinmux setting also includes the hardware reset pin for emmc.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

diff --git a/arch/arm/boot/dts/sun6i-a31.dtsi b/arch/arm/boot/dts/sun6i-a31.dtsi
index b6ad7850fac6931ee1eb6f1716418c16b849eae4..1867af24ff529c2b6590e0db0dcc2f807fd72a65 100644 (file)
--- a/arch/arm/boot/dts/sun6i-a31.dtsi
+++ b/arch/arm/boot/dts/sun6i-a31.dtsi
@@ -709,6 +709,16 @@
                                allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
                        };
 
+                       mmc3_8bit_emmc_pins: mmc3@1 {
+                               allwinner,pins = "PC6", "PC7", "PC8", "PC9",
+                                                "PC10", "PC11", "PC12",
+                                                "PC13", "PC14", "PC15",
+                                                "PC24";
+                               allwinner,function = "mmc3";
+                               allwinner,drive = <SUN4I_PINCTRL_40_MA>;
+                               allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
+                       };
+
                        gmac_pins_mii_a: gmac_mii@0 {
                                allwinner,pins = "PA0", "PA1", "PA2", "PA3",
                                                "PA8", "PA9", "PA11",