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