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";
 	};
 };
