From bafb94810a17cd66baa5d220f6005d8f1db1e516 Mon Sep 17 00:00:00 2001 From: Andrew Litt 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"; }; };