[alsa-devel] [PATCH 2/2] ASoC: fsl-esai: big-endian support

[Xiubo Li]

For most platforms, the CPU and ESAI device is in the same endianess
mode. While for the LS1 platform, the CPU is in LE mode and the ESAI
is in BE mode.

Signed-off-by: Xiubo Li <Li.Xiubo at freescale.com>
Cc: Nicolin Chen <Guangyu.Chen at freescale.com>
---
 Documentation/devicetree/bindings/sound/fsl,esai.txt | 6 ++++++
 sound/soc/fsl/fsl_esai.c                             | 7 ++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/sound/fsl,esai.txt b/Documentation/devicetree/bindings/sound/fsl,esai.txt
index d7b99fa..c395371 100644
--- a/Documentation/devicetree/bindings/sound/fsl,esai.txt
+++ b/Documentation/devicetree/bindings/sound/fsl,esai.txt
@@ -34,6 +34,11 @@ Required properties:
     that ESAI would work in the synchronous mode, which means all the settings
     for Receiving would be duplicated from Transmition related registers.
 
+  - big-endian : If this property is absent, the native endian mode will
+    be in use as default, or the big endian mode will be in use for all the
+    device registers.
+
+
 Example:
 
 esai: esai at 02024000 {
@@ -46,5 +51,6 @@ esai: esai at 02024000 {
 	dma-names = "rx", "tx";
 	fsl,fifo-depth = <128>;
 	fsl,esai-synchronous;
+	big-endian;
 	status = "disabled";
 };
diff --git a/sound/soc/fsl/fsl_esai.c b/sound/soc/fsl/fsl_esai.c
index c84026c..e1f2669 100644
--- a/sound/soc/fsl/fsl_esai.c
+++ b/sound/soc/fsl/fsl_esai.c
@@ -57,6 +57,7 @@ struct fsl_esai {
 	bool sck_div[2];
 	bool slave_mode;
 	bool synchronous;
+	bool big_endian;
 	char name[32];
 };
 
@@ -661,7 +662,7 @@ static bool fsl_esai_writeable_reg(struct device *dev, unsigned int reg)
 	}
 }
 
-static const struct regmap_config fsl_esai_regmap_config = {
+static struct regmap_config fsl_esai_regmap_config = {
 	.reg_bits = 32,
 	.reg_stride = 4,
 	.val_bits = 32,
@@ -687,6 +688,10 @@ static int fsl_esai_probe(struct platform_device *pdev)
 	esai_priv->pdev = pdev;
 	strcpy(esai_priv->name, np->name);
 
+	esai_priv->big_endian = of_property_read_bool(np, "big-endian");
+	if (esai_priv->big_endian)
+		fsl_esai_regmap_config.val_format_endian = REGMAP_ENDIAN_BIG;
+
 	/* Get the addresses and IRQ */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	regs = devm_ioremap_resource(&pdev->dev, res);
-- 
1.8.4