diff options
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.patch | 81 |
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"; ++ }; ++}; |