mirror of
git://git.openwrt.org/openwrt/openwrt.git
synced 2024-12-12 01:44:54 +00:00
75 lines
2.5 KiB
Diff
75 lines
2.5 KiB
Diff
|
From b7d6f1b965c5de2dd01d6719bee283dffa176362 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Phil Elwell <phil@raspberrypi.org>
|
||
|
|
Date: Mon, 4 Jan 2016 14:42:17 +0000
|
||
|
|
Subject: [PATCH 124/127] 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?";
|
||
|
|
+ };
|
||
|
|
+};
|