ARM: dts: sun8i: Add eMMC dt node on Orangepi Plus boards

The Orangepi Plus has a 16GB eMMC, the vcc, the lack of pull-ups and
the use of the hw-reset pin have all been verified with the board
schematic.

With this dts node for mmc2, the eMMC runs at the following ios settings:
clock:          52000000 Hz
vdd:            21 (3.3 ~ 3.4 V)
bus mode:       2 (push-pull)
chip select:    0 (don't care)
power mode:     2 (on)
bus width:      3 (8 bits)
timing spec:    8 (mmc DDR52)
signal voltage: 0 (3.30 V)
driver type:    0 (driver type B)

Note the mmcblk1boot0/boot1 partitions are unused as the BROM will load
the SPL from 8k from the start of the main blockdev, just as with a
regular sdcard in mmc0.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

diff --git a/arch/arm/boot/dts/sun8i-h3-orangepi-plus.dts b/arch/arm/boot/dts/sun8i-h3-orangepi-plus.dts
index c5c17bdf854218b169f1f54383d5abbc49b61514..6273ddfa8c8f33c3fad9725bfbe18f282a436605 100644 (file)
--- a/arch/arm/boot/dts/sun8i-h3-orangepi-plus.dts
+++ b/arch/arm/boot/dts/sun8i-h3-orangepi-plus.dts
@@ -186,6 +186,23 @@ &mmc1 {
        status = "okay";
 };
 
+&mmc2 {
+       pinctrl-names = "default";
+       pinctrl-0 = <&mmc2_8bit_pins>;
+       vmmc-supply = <&reg_vcc3v3>;
+       bus-width = <8>;
+       non-removable;
+       cap-mmc-hw-reset;
+       status = "okay";
+};
+
+&mmc2_8bit_pins {
+       /* Increase drive strength for DDR modes */
+       allwinner,drive = <SUN4I_PINCTRL_40_MA>;
+       /* eMMC is missing pull-ups */
+       allwinner,pull = <SUN4I_PINCTRL_PULL_UP>;
+};
+
 &reg_usb1_vbus {
        gpio = <&pio 6 13 GPIO_ACTIVE_HIGH>;
        status = "okay";