From: Sugar Zhang <sugar.zhang@rock-chips.com>
Date: Mon, 26 Dec 2016 06:11:45 +0000 (+0800)
Subject: ASoC: rockchip: i2s: add support for i2s bclk fs configuration
X-Git-Tag: firefly_0821_release~981
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=301447375511ed39444389ff0eabc1f25f26b9d8;p=firefly-linux-kernel-4.4.55.git

ASoC: rockchip: i2s: add support for i2s bclk fs configuration

this patch add support for i2s bclk fs configuration, we can
configure bclk_fs by devicetree as required.

Change-Id: I7e034e0466793b5b9eab6566a43e90213f219bb0
Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
---

diff --git a/Documentation/devicetree/bindings/sound/rockchip-i2s.txt b/Documentation/devicetree/bindings/sound/rockchip-i2s.txt
index 4ea29aa9af59..ebb54bd168da 100644
--- a/Documentation/devicetree/bindings/sound/rockchip-i2s.txt
+++ b/Documentation/devicetree/bindings/sound/rockchip-i2s.txt
@@ -22,6 +22,7 @@ Required properties:
    - "i2s_clk" : clock for I2S controller
 - rockchip,playback-channels: max playback channels, if not set, 8 channels default.
 - rockchip,capture-channels: max capture channels, if not set, 2 channels default.
+- rockchip,bclk-fs: configure the i2s bclk fs.
 
 Required properties for controller which support multi channels
 playback/capture:
@@ -40,4 +41,5 @@ i2s@ff890000 {
 	clocks = <&cru HCLK_I2S0>, <&cru SCLK_I2S0>;
 	rockchip,playback-channels = <8>;
 	rockchip,capture-channels = <2>;
+	rockchip,bclk-fs = <64>;
 };
diff --git a/sound/soc/rockchip/rockchip_i2s.c b/sound/soc/rockchip/rockchip_i2s.c
index d2d66f0b9e1f..f66ce65c24ce 100644
--- a/sound/soc/rockchip/rockchip_i2s.c
+++ b/sound/soc/rockchip/rockchip_i2s.c
@@ -51,6 +51,7 @@ struct rk_i2s_dev {
 	bool rx_start;
 	bool is_master_mode;
 	const struct rk_i2s_pins *pins;
+	unsigned int bclk_fs;
 };
 
 static int i2s_runtime_suspend(struct device *dev)
@@ -252,7 +253,7 @@ static int rockchip_i2s_hw_params(struct snd_pcm_substream *substream,
 
 	if (i2s->is_master_mode) {
 		mclk_rate = clk_get_rate(i2s->mclk);
-		bclk_rate = 2 * 32 * params_rate(params);
+		bclk_rate = i2s->bclk_fs * params_rate(params);
 		if (bclk_rate && mclk_rate % bclk_rate)
 			return -EINVAL;
 
@@ -631,6 +632,12 @@ static int rockchip_i2s_probe(struct platform_device *pdev)
 			soc_dai->capture.channels_max = val;
 	}
 
+	i2s->bclk_fs = 64;
+	if (!of_property_read_u32(node, "rockchip,bclk-fs", &val)) {
+		if ((val >= 32) && (val % 2 == 0))
+			i2s->bclk_fs = val;
+	}
+
 	ret = devm_snd_soc_register_component(&pdev->dev,
 					      &rockchip_i2s_component,
 					      soc_dai, 1);