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From bafb94810a17cd66baa5d220f6005d8f1db1e516 Mon Sep 17 00:00:00 2001
From: Andrew Litt <ajlitt@splunge.net>
Date: Mon, 11 Jan 2016 07:55:54 +0000
Subject: [PATCH] SDIO-overlay: add bus_width parameter
Allow setting of the SDIO bus width capability of the bcm2835-mmc
host. This is helpful when only a 1 bit wide bus is connected
between host and device but both host and device advertise 4 bit
mode.
---
arch/arm/boot/dts/overlays/README | 2 ++
arch/arm/boot/dts/overlays/sdio-overlay.dts | 2 ++
2 files changed, 4 insertions(+)
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -634,6 +634,8 @@ Params: overclock_50 Clock (
poll_once Disable SDIO-device polling every second
(default on: polling once at boot-time)
+ bus_width Set the SDIO host bus width (default 4 bits)
+
Name: sdtweak
Info: Tunes the bcm2835-sdhost SD/MMC driver
--- a/arch/arm/boot/dts/overlays/sdio-overlay.dts
+++ b/arch/arm/boot/dts/overlays/sdio-overlay.dts
@@ -11,6 +11,7 @@
pinctrl-names = "default";
pinctrl-0 = <&sdio_pins>;
non-removable;
+ bus-width = <4>;
status = "okay";
};
};
@@ -28,5 +29,6 @@
__overrides__ {
poll_once = <&sdio_mmc>,"non-removable?";
+ bus_width = <&sdio_mmc>,"bus-width:0";
};
};
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