target/linux/brcm2708/patches-4.4/0126-SDIO-overlay-add-bus_width-parameter.patch

   1 From 2716dea6b98618f690884fcb8569fd381888f515 Mon Sep 17 00:00:00 2001
   2 From: Andrew Litt <ajlitt@splunge.net>
   3 Date: Mon, 11 Jan 2016 07:55:54 +0000
   4 Subject: [PATCH 126/156] SDIO-overlay: add bus_width parameter
   5
   6 Allow setting of the SDIO bus width capability of the bcm2835-mmc
   7 host.  This is helpful when only a 1 bit wide bus is connected
   8 between host and device but both host and device advertise 4 bit
   9 mode.
  10 ---
  11  arch/arm/boot/dts/overlays/README           | 2 ++
  12  arch/arm/boot/dts/overlays/sdio-overlay.dts | 2 ++
  13  2 files changed, 4 insertions(+)
  14
  15 --- a/arch/arm/boot/dts/overlays/README
  16 +++ b/arch/arm/boot/dts/overlays/README
  17 @@ -634,6 +634,8 @@ Params: overclock_50             Clock (
  18          poll_once                Disable SDIO-device polling every second
  19                                   (default on: polling once at boot-time)
  20
  21 +        bus_width                Set the SDIO host bus width (default 4 bits)
  22 +
  23
  24  Name:   sdtweak
  25  Info:   Tunes the bcm2835-sdhost SD/MMC driver
  26 --- a/arch/arm/boot/dts/overlays/sdio-overlay.dts
  27 +++ b/arch/arm/boot/dts/overlays/sdio-overlay.dts
  28 @@ -11,6 +11,7 @@
  29                         pinctrl-names = "default";
  30                         pinctrl-0 = <&sdio_pins>;
  31                         non-removable;
  32 +                       bus-width = <4>;
  33                         status = "okay";
  34                 };
  35         };
  36 @@ -28,5 +29,6 @@
  37
  38         __overrides__ {
  39                 poll_once = <&sdio_mmc>,"non-removable?";
  40 +               bus_width = <&sdio_mmc>,"bus-width:0";
  41         };
  42  };