target/linux/brcm2708/patches-4.14/950-0279-BCM270X_DT-Add-sdio_overclock-parameter.patch

   1 From 3c015b0f686824f1b0815cc028665304ab0981d6 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Tue, 24 Apr 2018 14:28:33 +0100
   4 Subject: [PATCH 279/454] BCM270X_DT: Add sdio_overclock parameter
   5
   6 The Arasan MMC interface is used on some RPis to drive the SDIO
   7 link to the WiFi controller. The downstream bcm2835-mmc driver,
   8 like the bcm2835-sdhost driver, can be over- (or under-) clocked.
   9 Add a common parameter - sdio_overclock - to all DTBs to control it.
  10
  11 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
  12 ---
  13  arch/arm/boot/dts/bcm2708-rpi.dtsi | 1 +
  14  arch/arm/boot/dts/overlays/README  | 3 +++
  15  2 files changed, 4 insertions(+)
  16
  17 --- a/arch/arm/boot/dts/bcm2708-rpi.dtsi
  18 +++ b/arch/arm/boot/dts/bcm2708-rpi.dtsi
  19 @@ -115,6 +115,7 @@
  20                 sd_force_pio = <&sdhost>,"brcm,force-pio?";
  21                 sd_pio_limit = <&sdhost>,"brcm,pio-limit:0";
  22                 sd_debug     = <&sdhost>,"brcm,debug";
  23 +               sdio_overclock = <&mmc>,"brcm,overclock-50:0";
  24                 axiperf      = <&axiperf>,"status";
  25         };
  26  };
  27 --- a/arch/arm/boot/dts/overlays/README
  28 +++ b/arch/arm/boot/dts/overlays/README
  29 @@ -139,6 +139,9 @@ Params:
  30
  31          sd_debug                Enable debug output from SD driver (default off)
  32
  33 +        sdio_overclock          Clock (in MHz) to use when the MMC framework
  34 +                                requests 50MHz for the SDIO/WiFi interface.
  35 +
  36          tx_lpi_timer            Set the delay in microseconds between going idle
  37                                  and entering the low power state (default 600).
  38                                  Requires EEE to be enabled - see "eee".