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authorShawn Guo <shawn.guo@linaro.org>2013-07-01 16:16:10 +0800
committerMark Brown <broonie@linaro.org>2013-07-01 11:12:20 +0100
commit7c9e6150f2e7cbd60e0bc9a19118ca1dc97d2780 (patch)
tree7956944a101488724bea59c15c7db7bcc2fa606a
parent8bb495e3f02401ee6f76d1b1d77f3ac9f079e376 (diff)
downloadop-kernel-dev-7c9e6150f2e7cbd60e0bc9a19118ca1dc97d2780.zip
op-kernel-dev-7c9e6150f2e7cbd60e0bc9a19118ca1dc97d2780.tar.gz
ASoC: mxs: register saif mclk to clock framework
Mostly the mxs system design uses saif0 mclk output as the clock source of codec. Since the mclk is implemented as a general divider with the saif clk as the parent clock, let's register the mclk as a basic clk-divider to common clock framework. Then with it being a clock provdier, clk_get() call in codec driver probe function will just work. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Mark Brown <broonie@linaro.org>
-rw-r--r--sound/soc/mxs/mxs-saif.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/sound/soc/mxs/mxs-saif.c b/sound/soc/mxs/mxs-saif.c
index d31dc52..9ad6dcc 100644
--- a/sound/soc/mxs/mxs-saif.c
+++ b/sound/soc/mxs/mxs-saif.c
@@ -24,6 +24,7 @@
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/clk.h>
+#include <linux/clk-provider.h>
#include <linux/delay.h>
#include <linux/time.h>
#include <linux/fsl/mxs-dma.h>
@@ -662,6 +663,33 @@ static irqreturn_t mxs_saif_irq(int irq, void *dev_id)
return IRQ_HANDLED;
}
+static int mxs_saif_mclk_init(struct platform_device *pdev)
+{
+ struct mxs_saif *saif = platform_get_drvdata(pdev);
+ struct device_node *np = pdev->dev.of_node;
+ struct clk *clk;
+ int ret;
+
+ clk = clk_register_divider(&pdev->dev, "mxs_saif_mclk",
+ __clk_get_name(saif->clk), 0,
+ saif->base + SAIF_CTRL,
+ BP_SAIF_CTRL_BITCLK_MULT_RATE, 3,
+ 0, NULL);
+ if (IS_ERR(clk)) {
+ ret = PTR_ERR(clk);
+ if (ret == -EEXIST)
+ return 0;
+ dev_err(&pdev->dev, "failed to register mclk: %d\n", ret);
+ return PTR_ERR(clk);
+ }
+
+ ret = of_clk_add_provider(np, of_clk_src_simple_get, clk);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
static int mxs_saif_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
@@ -769,6 +797,13 @@ static int mxs_saif_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, saif);
+ /* We only support saif0 being tx and clock master */
+ if (saif->id == 0) {
+ ret = mxs_saif_mclk_init(pdev);
+ if (ret)
+ dev_warn(&pdev->dev, "failed to init clocks\n");
+ }
+
ret = snd_soc_register_component(&pdev->dev, &mxs_saif_component,
&mxs_saif_dai, 1);
if (ret) {
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