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ASoC: mxs: register saif mclk to clock framework

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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>
This commit is contained in:
Shawn Guo 2013-07-01 16:16:10 +08:00 committed by Mark Brown
parent 8bb495e3f0
commit 7c9e6150f2
1 changed files with 35 additions and 0 deletions
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35
sound/soc/mxs/mxs-saif.c
View file

@ -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) {