2016-09-10 12:54:26 +00:00
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From 5c8479b7e82155eed9e86658935dda7bf8202b8d Mon Sep 17 00:00:00 2001
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2016-01-17 10:42:23 +00:00
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Mon, 4 Jan 2016 14:42:17 +0000
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2016-09-10 12:54:26 +00:00
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Subject: [PATCH] BCM270X_DT: Add the sdtweak overlay, for tuning sdhost
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2016-01-17 10:42:23 +00:00
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The sdhost overlay declares the sdhost interface and allows parameters
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to be set. This is overkill for situations where the user just wants to
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tweak the parameters of a pre-declared sdhost interface, so create an
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sdtweak overlay that does just that.
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---
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arch/arm/boot/dts/overlays/Makefile | 1 +
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arch/arm/boot/dts/overlays/README | 14 ++++++++++++++
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arch/arm/boot/dts/overlays/sdtweak-overlay.dts | 21 +++++++++++++++++++++
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3 files changed, 36 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/sdtweak-overlay.dts
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--- a/arch/arm/boot/dts/overlays/Makefile
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+++ b/arch/arm/boot/dts/overlays/Makefile
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@@ -53,6 +53,7 @@ dtb-$(RPI_DT_OVERLAYS) += rpi-proto-over
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dtb-$(RPI_DT_OVERLAYS) += rpi-sense-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += sdhost-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += sdio-overlay.dtb
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+dtb-$(RPI_DT_OVERLAYS) += sdtweak-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += smi-dev-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += smi-nand-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += smi-overlay.dtb
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -635,6 +635,20 @@ Params: overclock_50 Clock (
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(default on: polling once at boot-time)
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+Name: sdtweak
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+Info: Tunes the bcm2835-sdhost SD/MMC driver
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+Load: dtoverlay=sdtweak,<param>=<val>
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+Params: overclock_50 Clock (in MHz) to use when the MMC framework
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+ requests 50MHz
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+
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+ force_pio Disable DMA support (default off)
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+
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+ pio_limit Number of blocks above which to use DMA
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+ (default 1)
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+
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+ debug Enable debug output (default off)
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+
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+
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Name: smi
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Info: Enables the Secondary Memory Interface peripheral. Uses GPIOs 2-25!
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Load: dtoverlay=smi
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/sdtweak-overlay.dts
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@@ -0,0 +1,21 @@
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+/dts-v1/;
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+/plugin/;
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+
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+/{
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+ compatible = "brcm,bcm2708";
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+
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+ fragment@0 {
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+ target = <&sdhost>;
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+ frag1: __overlay__ {
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+ brcm,overclock-50 = <0>;
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+ brcm,pio-limit = <1>;
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+ };
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+ };
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+
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+ __overrides__ {
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+ overclock_50 = <&frag1>,"brcm,overclock-50:0";
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+ force_pio = <&frag1>,"brcm,force-pio?";
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+ pio_limit = <&frag1>,"brcm,pio-limit:0";
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+ debug = <&frag1>,"brcm,debug?";
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+ };
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+};
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