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Commit ae94cafe authored by Ulf Hansson's avatar Ulf Hansson
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mmc: mmci: Add DT bindings for signal direction 



Some variants have support for indicating the bus signal directions,
which currently are configured through platform data.

Add corresponding DT bindings to enable us to move away from using the
platform data.

Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Reviewed-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent dc03294a

Documentation/devicetree/bindings/mmc/mmci.txt

+10 −1
Original line number Diff line number Diff line
@@ -4,7 +4,8 @@ The ARM PrimeCell MMCI PL180 and PL181 provides an interface for 
reading and writing to MultiMedia and SD cards alike.



This file documents differences between the core properties described

by mmc.txt and the properties used by the mmci driver.

by mmc.txt and the properties used by the mmci driver. Using "st" as

the prefix for a property, indicates support by the ST Micro variant.



Required properties:

- compatible             : contains "arm,pl18x", "arm,primecell".
@@ -18,6 +19,11 @@ Optional properties: 
- mmc-cap-sd-highspeed   : indicates whether SD is high speed capable.

- vqmmc-supply           : phandle to the regulator device tree node, mentioned

                           as the VCCQ/VDD_IO supply in the eMMC/SD specs.

- st,sig-dir-dat0        : bus signal direction pin used for DAT[0].

- st,sig-dir-dat2        : bus signal direction pin used for DAT[2].

- st,sig-dir-dat31       : bus signal direction pin used for DAT[3] and DAT[1].

- st,sig-dir-dat74       : bus signal direction pin used for DAT[4] to DAT[7].

- st,sig-dir-cmd         : cmd signal direction pin used for CMD.



Example:
@@ -38,6 +44,9 @@ sdi0_per1@80126000 { 
	mmc-cap-sd-highspeed;

	mmc-cap-mmc-highspeed;

	cd-gpios  = <&gpio2 31 0x4>; // 95

	st,sig-dir-dat0;

	st,sig-dir-dat2;

	st,sig-dir-cmd;



	vmmc-supply = <&ab8500_ldo_aux3_reg>;

	vqmmc-supply = <&vmmci>;

drivers/mmc/host/mmci.c

+11 −0
Original line number Diff line number Diff line
@@ -1392,6 +1392,17 @@ static void mmci_dt_populate_generic_pdata(struct device_node *np, 
{

	int bus_width = 0;



	if (of_get_property(np, "st,sig-dir-dat0", NULL))

		pdata->sigdir |= MCI_ST_DATA0DIREN;

	if (of_get_property(np, "st,sig-dir-dat2", NULL))

		pdata->sigdir |= MCI_ST_DATA2DIREN;

	if (of_get_property(np, "st,sig-dir-dat31", NULL))

		pdata->sigdir |= MCI_ST_DATA31DIREN;

	if (of_get_property(np, "st,sig-dir-dat74", NULL))

		pdata->sigdir |= MCI_ST_DATA74DIREN;

	if (of_get_property(np, "st,sig-dir-cmd", NULL))

		pdata->sigdir |= MCI_ST_CMDDIREN;



	pdata->gpio_wp = of_get_named_gpio(np, "wp-gpios", 0);

	pdata->gpio_cd = of_get_named_gpio(np, "cd-gpios", 0);