From 4cbc6dbd52516363c61ad8f116355ad63fe9cdf2 Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Sat, 30 Jul 2016 17:03:50 +0200 Subject: [PATCH] dt: bindings: Make compatible optional for mmc function nodes On some boards (android tablets) different batches use different sdio wifi modules. This is not a problem since mmc/sdio is an enumerable bus, so we only need to describe and activate the mmc controller in dt and then the kernel will automatically load the right driver. Sometimes it is useful to specify certain ethernet properties for these "unknown" sdio devices, specifically we want the boot-loader to be able to set "local-mac-address" as some of these sdio wifi modules come without an eeprom / without a factory programmed mac address. Since the exact device is unknown (differs per batch) we cannot use a wifi-chip specific compatible, thus sometimes it is desirable to have a mmc function node, without having to make up an otherwise unused compatible for the node, so make the compatible property optional. Cc: Arnd Bergmann Cc: Maxime Ripard Signed-off-by: Hans de Goede Acked-by: Rob Herring Signed-off-by: Ulf Hansson --- Documentation/devicetree/bindings/mmc/mmc.txt | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/mmc/mmc.txt b/Documentation/devicetree/bindings/mmc/mmc.txt index 22d1e1f..ac7b6a1 100644 --- a/Documentation/devicetree/bindings/mmc/mmc.txt +++ b/Documentation/devicetree/bindings/mmc/mmc.txt @@ -102,11 +102,13 @@ Required host node properties when using function subnodes: - #size-cells: should be zero. Required function subnode properties: -- compatible: name of SDIO function following generic names recommended practice - reg: Must contain the SDIO function number of the function this subnode describes. A value of 0 denotes the memory SD function, values from 1 to 7 denote the SDIO functions. +Optional function subnode properties: +- compatible: name of SDIO function following generic names recommended practice + Examples -------- -- 2.7.4