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Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0200-BCM270X_DT-Add-1-bit-SDIO-using-minimal-pins.patch')
-rw-r--r--target/linux/brcm2708/patches-4.4/0200-BCM270X_DT-Add-1-bit-SDIO-using-minimal-pins.patch81
1 files changed, 81 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0200-BCM270X_DT-Add-1-bit-SDIO-using-minimal-pins.patch b/target/linux/brcm2708/patches-4.4/0200-BCM270X_DT-Add-1-bit-SDIO-using-minimal-pins.patch
new file mode 100644
index 0000000000..3aea5f67e6
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.4/0200-BCM270X_DT-Add-1-bit-SDIO-using-minimal-pins.patch
@@ -0,0 +1,81 @@
+From 19d839cafdd5ddb1233df5be821d702e655d2d16 Mon Sep 17 00:00:00 2001
+From: campag <dave-lowe@ntlworld.com>
+Date: Wed, 24 Feb 2016 16:45:42 +0000
+Subject: [PATCH 200/232] BCM270X_DT: Add 1-bit SDIO using minimal pins...
+
+... for that mode: GPIOs 22-25.
+---
+ arch/arm/boot/dts/overlays/README | 21 ++++++++++++++
+ arch/arm/boot/dts/overlays/sdio-1bit-overlay.dts | 36 ++++++++++++++++++++++++
+ 2 files changed, 57 insertions(+)
+ create mode 100644 arch/arm/boot/dts/overlays/sdio-1bit-overlay.dts
+
+--- a/arch/arm/boot/dts/overlays/README
++++ b/arch/arm/boot/dts/overlays/README
+@@ -709,6 +709,27 @@ Params: overclock_50 SD Clock
+ bus_width Set the SDIO host bus width (default 4 bits)
+
+
++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: overclock_50 SD Clock (in MHz) to use when the MMC framework
++ requests 50MHz
++
++ sdio_overclock SDIO Clock (in MHz) to use when the MMC
++ framework requests 50MHz
++
++ force_pio Disable DMA support (default off)
++
++ pio_limit Number of blocks above which to use DMA
++ (default 1)
++
++ debug Enable debug output (default off)
++
++ poll_once Disable SDIO-device polling every second
++ (default on: polling once at boot-time)
++
++
+ Name: sdtweak
+ Info: Tunes the bcm2835-sdhost SD/MMC driver
+ Load: dtoverlay=sdtweak,<param>=<val>
+--- /dev/null
++++ b/arch/arm/boot/dts/overlays/sdio-1bit-overlay.dts
+@@ -0,0 +1,36 @@
++/* Enable 1-bit SDIO from MMC interface via GPIOs 22-25. Includes sdhost overlay. */
++
++/include/ "sdhost-overlay.dts"
++
++/{
++ compatible = "brcm,bcm2708";
++
++ fragment@3 {
++ target = <&mmc>;
++ sdio_mmc: __overlay__ {
++ compatible = "brcm,bcm2835-mmc";
++ pinctrl-names = "default";
++ pinctrl-0 = <&sdio_pins>;
++ non-removable;
++ bus-width = <1>;
++ brcm,overclock-50 = <0>;
++ status = "okay";
++ };
++ };
++
++ fragment@4 {
++ target = <&gpio>;
++ __overlay__ {
++ sdio_pins: sdio_pins {
++ brcm,pins = <22 23 24 25>;
++ brcm,function = <7 7 7 7>; /* ALT3 = SD1 */
++ brcm,pull = <0 2 2 2>;
++ };
++ };
++ };
++
++ __overrides__ {
++ poll_once = <&sdio_mmc>,"non-removable?";
++ sdio_overclock = <&sdio_mmc>,"brcm,overclock-50:0";
++ };
++};