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