diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0123-BCM270X_DT-Add-the-sdtweak-overlay-for-tuning-sdhost.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0123-BCM270X_DT-Add-the-sdtweak-overlay-for-tuning-sdhost.patch | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0123-BCM270X_DT-Add-the-sdtweak-overlay-for-tuning-sdhost.patch b/target/linux/brcm2708/patches-4.4/0123-BCM270X_DT-Add-the-sdtweak-overlay-for-tuning-sdhost.patch new file mode 100644 index 0000000000..91893c51e1 --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0123-BCM270X_DT-Add-the-sdtweak-overlay-for-tuning-sdhost.patch @@ -0,0 +1,74 @@ +From 5d03b10c60e70fb5d316706a3777e46dc9dd748e Mon Sep 17 00:00:00 2001 +From: Phil Elwell <phil@raspberrypi.org> +Date: Mon, 4 Jan 2016 14:42:17 +0000 +Subject: [PATCH 123/232] BCM270X_DT: Add the sdtweak overlay, for tuning + sdhost + +The sdhost overlay declares the sdhost interface and allows parameters +to be set. This is overkill for situations where the user just wants to +tweak the parameters of a pre-declared sdhost interface, so create an +sdtweak overlay that does just that. +--- + arch/arm/boot/dts/overlays/Makefile | 1 + + arch/arm/boot/dts/overlays/README | 14 ++++++++++++++ + arch/arm/boot/dts/overlays/sdtweak-overlay.dts | 21 +++++++++++++++++++++ + 3 files changed, 36 insertions(+) + create mode 100644 arch/arm/boot/dts/overlays/sdtweak-overlay.dts + +--- a/arch/arm/boot/dts/overlays/Makefile ++++ b/arch/arm/boot/dts/overlays/Makefile +@@ -53,6 +53,7 @@ dtb-$(RPI_DT_OVERLAYS) += rpi-proto-over + dtb-$(RPI_DT_OVERLAYS) += rpi-sense-overlay.dtb + dtb-$(RPI_DT_OVERLAYS) += sdhost-overlay.dtb + dtb-$(RPI_DT_OVERLAYS) += sdio-overlay.dtb ++dtb-$(RPI_DT_OVERLAYS) += sdtweak-overlay.dtb + dtb-$(RPI_DT_OVERLAYS) += smi-dev-overlay.dtb + dtb-$(RPI_DT_OVERLAYS) += smi-nand-overlay.dtb + dtb-$(RPI_DT_OVERLAYS) += smi-overlay.dtb +--- a/arch/arm/boot/dts/overlays/README ++++ b/arch/arm/boot/dts/overlays/README +@@ -635,6 +635,20 @@ Params: overclock_50 Clock ( + (default on: polling once at boot-time) + + ++Name: sdtweak ++Info: Tunes the bcm2835-sdhost SD/MMC driver ++Load: dtoverlay=sdtweak,<param>=<val> ++Params: overclock_50 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) ++ ++ + Name: smi + Info: Enables the Secondary Memory Interface peripheral. Uses GPIOs 2-25! + Load: dtoverlay=smi +--- /dev/null ++++ b/arch/arm/boot/dts/overlays/sdtweak-overlay.dts +@@ -0,0 +1,21 @@ ++/dts-v1/; ++/plugin/; ++ ++/{ ++ compatible = "brcm,bcm2708"; ++ ++ fragment@0 { ++ target = <&sdhost>; ++ frag1: __overlay__ { ++ brcm,overclock-50 = <0>; ++ brcm,pio-limit = <1>; ++ }; ++ }; ++ ++ __overrides__ { ++ overclock_50 = <&frag1>,"brcm,overclock-50:0"; ++ force_pio = <&frag1>,"brcm,force-pio?"; ++ pio_limit = <&frag1>,"brcm,pio-limit:0"; ++ debug = <&frag1>,"brcm,debug?"; ++ }; ++}; |