Commit 1a7e99c1 authored by Ulf Hansson's avatar Ulf Hansson
Browse files

mmc: mmci: Add DT bindings for feedback clock pin 



The ST Micro variant supports the option of using a feedback clock signal in
favor of the clockout pin when latching incoming signals on the data bus.

Since this is matter of how pins are being routed we need to provide a new DT
binding to be able to configure this through DT.

Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Reviewed-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent ae94cafe

Documentation/devicetree/bindings/mmc/mmci.txt

+2 −0
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ Optional properties: 
- 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.

- st,sig-pin-fbclk       : feedback clock signal pin used.



Example:
@@ -47,6 +48,7 @@ sdi0_per1@80126000 { 
	st,sig-dir-dat0;

	st,sig-dir-dat2;

	st,sig-dir-cmd;

	st,sig-pin-fbclk;



	vmmc-supply = <&ab8500_ldo_aux3_reg>;

	vqmmc-supply = <&vmmci>;

drivers/mmc/host/mmci.c

+2 −0
Original line number Diff line number Diff line
@@ -1402,6 +1402,8 @@ static void mmci_dt_populate_generic_pdata(struct device_node *np, 
		pdata->sigdir |= MCI_ST_DATA74DIREN;

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

		pdata->sigdir |= MCI_ST_CMDDIREN;

	if (of_get_property(np, "st,sig-pin-fbclk", NULL))

		pdata->sigdir |= MCI_ST_FBCLKEN;



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

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

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