mirror of
https://github.com/torvalds/linux.git
synced 2024-12-29 14:21:47 +00:00
3cbcb16095
The Allwinner sunxi mmc host uses dma in bus-master mode using a built-in designware idmac controller, which is identical to the one found in the mmc-dw hosts. However the rest of the host is not identical to mmc-dw, it deals with sending stop commands in hardware which makes it significantly different from the mmc-dw devices. Signed-off-by: David Lanzendörfer <david.lanzendoerfer@o2s.ch> [hdegoede@redhat.com: various cleanups and fixes] Signed-off-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Chris Ball <chris@printf.net> Signed-off-by: Mike Turquette <mturquette@linaro.org>
44 lines
1.2 KiB
Plaintext
44 lines
1.2 KiB
Plaintext
* Allwinner sunxi MMC controller
|
|
|
|
The highspeed MMC host controller on Allwinner SoCs provides an interface
|
|
for MMC, SD and SDIO types of memory cards.
|
|
|
|
Supported maximum speeds are the ones of the eMMC standard 4.5 as well
|
|
as the speed of SD standard 3.0.
|
|
Absolute maximum transfer rate is 200MB/s
|
|
|
|
Required properties:
|
|
- compatible : "allwinner,sun4i-a10-mmc" or "allwinner,sun5i-a13-mmc"
|
|
- reg : mmc controller base registers
|
|
- clocks : a list with 2 phandle + clock specifier pairs
|
|
- clock-names : must contain "ahb" and "mmc"
|
|
- interrupts : mmc controller interrupt
|
|
|
|
Optional properties:
|
|
- resets : phandle + reset specifier pair
|
|
- reset-names : must contain "ahb"
|
|
- for cd, bus-width and additional generic mmc parameters
|
|
please refer to mmc.txt within this directory
|
|
|
|
Examples:
|
|
- Within .dtsi:
|
|
mmc0: mmc@01c0f000 {
|
|
compatible = "allwinner,sun5i-a13-mmc";
|
|
reg = <0x01c0f000 0x1000>;
|
|
clocks = <&ahb_gates 8>, <&mmc0_clk>;
|
|
clock-names = "ahb", "mod";
|
|
interrupts = <0 32 4>;
|
|
status = "disabled";
|
|
};
|
|
|
|
- Within dts:
|
|
mmc0: mmc@01c0f000 {
|
|
pinctrl-names = "default", "default";
|
|
pinctrl-0 = <&mmc0_pins_a>;
|
|
pinctrl-1 = <&mmc0_cd_pin_reference_design>;
|
|
bus-width = <4>;
|
|
cd-gpios = <&pio 7 1 0>; /* PH1 */
|
|
cd-inverted;
|
|
status = "okay";
|
|
};
|