From ce7344a4ebabe90e064d3e087727f45624cdc942 Mon Sep 17 00:00:00 2001 From: Nicolin Chen Date: Fri, 8 Aug 2014 18:41:19 +0800 Subject: [PATCH] ASoC: fsl_sai: Make Synchronous and Asynchronous modes exclusive The previous patch (ASoC: fsl_sai: Add asynchronous mode support) added new Device Tree bindings for Asynchronous and Synchronous modes support. However, these two shall not be present at the same time. So this patch just simply makes them exclusive so as to avoid incorrect Device Tree binding usage. Signed-off-by: Nicolin Chen Signed-off-by: Mark Brown --- Documentation/devicetree/bindings/sound/fsl-sai.txt | 3 +-- sound/soc/fsl/fsl_sai.c | 7 +++++++ 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/Documentation/devicetree/bindings/sound/fsl-sai.txt b/Documentation/devicetree/bindings/sound/fsl-sai.txt index 77864f4dd352..dc9f9c356268 100644 --- a/Documentation/devicetree/bindings/sound/fsl-sai.txt +++ b/Documentation/devicetree/bindings/sound/fsl-sai.txt @@ -38,8 +38,7 @@ Note: default synchronous mode (sync Rx with Tx) will be used, which means both transimitter and receiver will send and receive data by following clocks of transimitter. -- fsl,sai-asynchronous will be ignored if fsl,sai-synchronous-rx property is - already present. +- fsl,sai-asynchronous and fsl,sai-synchronous-rx are exclusive. Example: sai2: sai@40031000 { diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c index ef7c758627b1..4c9e71c2f52a 100644 --- a/sound/soc/fsl/fsl_sai.c +++ b/sound/soc/fsl/fsl_sai.c @@ -634,6 +634,13 @@ static int fsl_sai_probe(struct platform_device *pdev) fsl_sai_dai.symmetric_channels = 1; fsl_sai_dai.symmetric_samplebits = 1; + if (of_find_property(np, "fsl,sai-synchronous-rx", NULL) && + of_find_property(np, "fsl,sai-asynchronous", NULL)) { + /* error out if both synchronous and asynchronous are present */ + dev_err(&pdev->dev, "invalid binding for synchronous mode\n"); + return -EINVAL; + } + if (of_find_property(np, "fsl,sai-synchronous-rx", NULL)) { /* Sync Rx with Tx */ sai->synchronous[RX] = false; -- 2.11.0