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From b80428cf646d37e5b84103807a7259f8dccfe4d0 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Wed, 30 Mar 2016 17:07:15 +0100
Subject: [PATCH] BCM270X_DT: Document hazards of sdhost overlay
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
arch/arm/boot/dts/overlays/README | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -712,7 +712,11 @@ Params: <None>
Name: sdhost
-Info: Selects the bcm2835-sdhost SD/MMC driver, optionally with overclock
+Info: Selects the bcm2835-sdhost SD/MMC driver, optionally with overclock.
+ N.B. This overlay is designed for situations where the mmc driver is
+ the default, so it disables the other (mmc) interface - this will kill
+ WiFi on a Pi3. If this isn't what you want, either use the sdtweak
+ overlay or the new sd_* dtparams of the base DTBs.
Load: dtoverlay=sdhost,<param>=<val>
Params: overclock_50 Clock (in MHz) to use when the MMC framework
requests 50MHz
@@ -771,6 +775,8 @@ Params: overclock_50 SD Clock
Name: sdtweak
Info: Tunes the bcm2835-sdhost SD/MMC driver
+ N.B. This functionality is now available via the sd_* dtparams in the
+ base DTB.
Load: dtoverlay=sdtweak,<param>=<val>
Params: overclock_50 Clock (in MHz) to use when the MMC framework
requests 50MHz
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