Commit 608ce510 authored by Phil Elwell's avatar Phil Elwell Committed by Phil Elwell
Browse files

overlays: sdio: Add enhanced 1-bit support 



"dtoverlay=sdio,bus_width=1,gpios_22_25" is equivalent to the sdio-1bit
overlay, which is now deprecated.

"dtoverlay=sdio,bus_width=1,gpios_34_37" enables 1-bit mode on GPIOs 34-37.

Signed-off-by: default avatarPhil Elwell <phil@raspberrypi.org>
parent efdcb6d2

arch/arm/boot/dts/overlays/README

+13 −11
Original line number Diff line number Diff line
@@ -469,8 +469,7 @@ Params: <None> 


Name:   bmp085_i2c-sensor

Info:   This overlay is now deprecated - see i2c-sensor

Load:   dtoverlay=bmp085_i2c-sensor

Params: <None>

Load:   <Deprecated>





Name:   dht11
@@ -1737,7 +1736,8 @@ Params: overclock_50 Clock (in MHz) to use when the MMC framework 


Name:   sdio

Info:   Selects the bcm2835-sdhost SD/MMC driver, optionally with overclock,

        and enables SDIO via GPIOs 22-27.

        and enables SDIO via GPIOs 22-27. An example of use in 1-bit mode is

        "dtoverlay=sdio,bus_width=1,gpios_22_25"

Load:   dtoverlay=sdio,<param>=<val>

Params: sdio_overclock          SDIO Clock (in MHz) to use when the MMC

                                framework requests 50MHz
@@ -1747,16 +1747,18 @@ Params: sdio_overclock SDIO Clock (in MHz) to use when the MMC 


        bus_width               Set the SDIO host bus width (default 4 bits)



        gpios_22_25             Select GPIOs 22-25 for 1-bit mode. Must be used

                                with bus_width=1. This replaces the sdio-1bit

                                overlay, which is now deprecated.



Name:   sdio-1bit

Info:   Selects the bcm2835-sdhost SD/MMC driver, optionally with overclock,

        and enables 1-bit SDIO via GPIOs 22-25.

Load:   dtoverlay=sdio-1bit,<param>=<val>

Params: sdio_overclock          SDIO Clock (in MHz) to use when the MMC

                                framework requests 50MHz

        gpios_34_37             Select GPIOs 34-37 for 1-bit mode. Must be used

                                with bus_width=1.



        poll_once               Disable SDIO-device polling every second

                                (default on: polling once at boot-time)



Name:   sdio-1bit

Info:   This overlay is now deprecated. Use

        "dtoverlay=sdio,bus_width=1,gpios_22_25" instead.

Load:   <Deprecated>





Name:   sdtweak

arch/arm/boot/dts/overlays/sdio-overlay.dts

+18 −0
Original line number Diff line number Diff line
@@ -49,6 +49,22 @@ 
	};



	fragment@3 {

		target = <&sdio_ovl_pins>;

		__dormant__ {

			brcm,pins = <22 23 24 25>;

			brcm,pull = <0 2 2 2>;

		};

	};



	fragment@4 {

		target = <&sdio_ovl_pins>;

		__dormant__ {

			brcm,pins = <34 35 36 37>;

			brcm,pull = <0 2 2 2>;

		};

	};



	fragment@6 {

		target-path = "/aliases";

		__overlay__ {

			mmc1 = "/soc/sdio@7e300000";
@@ -59,5 +75,7 @@ 
		poll_once = <&sdio_ovl>,"non-removable?";

		bus_width = <&sdio_ovl>,"bus-width:0";

		sdio_overclock = <&sdio_ovl>,"brcm,overclock-50:0";

		gpios_22_25 = <0>,"=3";

		gpios_34_37 = <0>,"=4";

	};

};