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sunxi: Enable eMMC on Libre Computer Board ALL-H3-CC boards

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The Libretech ALL-H3-CC has a high density connector for attaching
an eMMC module. The module form factor and connection is specific
to Libretech, and has provisions for split vmmc/vqmmc (core and I/O)
voltage supplies, but this board does not wire the vqmmc side. The
H2+/H3/H5 SoCs do not support alternate I/O voltages for eMMC either.
Only 3.3V is supported. A specific module that ties vqmmc to vmmc,
with both at 3.3V, must be used.

Given that a) eMMC is not designed to be hotplugged, b) power is
always provided on the pins, and c) MMC controllers can deal with
missing cards, we can enable this by default. If a module is attached
it will be picked up by the system.

The device tree change was also submitted to the Linux Kernel and
has already been queued up for 4.19.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
This commit is contained in:
Chen-Yu Tsai 2018-07-14 21:55:45 +08:00 committed by Jagan Teki
parent a8b36f22b2
commit 32f67bb7a1
4 changed files with 12 additions and 0 deletions
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9
arch/arm/dts/sunxi-libretech-all-h3-cc.dtsi
View file

@ -138,6 +138,15 @@
status = "okay";
};
&mmc2 {
pinctrl-names = "default";
pinctrl-0 = <&mmc2_8bit_pins>;
vmmc-supply = <&reg_vcc_io>;
bus-width = <8>;
non-removable;
status = "okay";
};
&ohci1 {
status = "okay";
};

1
configs/libretech_all_h3_cc_h2_plus_defconfig
View file

@ -5,6 +5,7 @@ CONFIG_MACH_SUN8I_H3=y
CONFIG_DRAM_CLK=672
CONFIG_DRAM_ZQ=3881979
CONFIG_DRAM_ODT_EN=y
CONFIG_MMC_SUNXI_SLOT_EXTRA=2
CONFIG_DEFAULT_DEVICE_TREE="sun8i-h2-plus-libretech-all-h3-cc"
# CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
# CONFIG_CMD_FLASH is not set

1
configs/libretech_all_h3_cc_h3_defconfig
View file

@ -5,6 +5,7 @@ CONFIG_MACH_SUN8I_H3=y
CONFIG_DRAM_CLK=672
CONFIG_DRAM_ZQ=3881979
CONFIG_DRAM_ODT_EN=y
CONFIG_MMC_SUNXI_SLOT_EXTRA=2
CONFIG_DEFAULT_DEVICE_TREE="sun8i-h3-libretech-all-h3-cc"
# CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
# CONFIG_CMD_FLASH is not set

1
configs/libretech_all_h3_cc_h5_defconfig
View file

@ -5,6 +5,7 @@ CONFIG_MACH_SUN50I_H5=y
CONFIG_DRAM_CLK=672
CONFIG_DRAM_ZQ=3881979
CONFIG_DRAM_ODT_EN=y
CONFIG_MMC_SUNXI_SLOT_EXTRA=2
CONFIG_DEFAULT_DEVICE_TREE="sun50i-h5-libretech-all-h3-cc"
# CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
# CONFIG_CMD_FLASH is not set