ASoC: davinci-mcasp: Support for fck reparenting
Optional DT property to specify the desired parent clock for the McASP fck
clock.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c
index 8ec8795..b7858bf 100644
--- a/sound/soc/davinci/davinci-mcasp.c
+++ b/sound/soc/davinci/davinci-mcasp.c
@@ -21,6 +21,7 @@
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/io.h>
+#include <linux/clk.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/of_platform.h>
@@ -823,6 +824,46 @@
};
MODULE_DEVICE_TABLE(of, mcasp_dt_ids);
+static int mcasp_reparent_fck(struct platform_device *pdev)
+{
+ struct device_node *node = pdev->dev.of_node;
+ struct clk *gfclk, *parent_clk;
+ const char *parent_name;
+ int ret;
+
+ if (!node)
+ return 0;
+
+ parent_name = of_get_property(node, "fck_parent", NULL);
+ if (!parent_name)
+ return 0;
+
+ gfclk = clk_get(&pdev->dev, "fck");
+ if (IS_ERR(gfclk)) {
+ dev_err(&pdev->dev, "failed to get fck\n");
+ return PTR_ERR(gfclk);
+ }
+
+ parent_clk = clk_get(NULL, parent_name);
+ if (IS_ERR(parent_clk)) {
+ dev_err(&pdev->dev, "failed to get parent clock\n");
+ ret = PTR_ERR(parent_clk);
+ goto err1;
+ }
+
+ ret = clk_set_parent(gfclk, parent_clk);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to reparent fck\n");
+ goto err2;
+ }
+
+err2:
+ clk_put(parent_clk);
+err1:
+ clk_put(gfclk);
+ return ret;
+}
+
static struct snd_platform_data *davinci_mcasp_set_pdata_from_of(
struct platform_device *pdev)
{
@@ -1052,6 +1093,9 @@
mcasp->dma_data[SNDRV_PCM_STREAM_CAPTURE].filter_data = "rx";
dev_set_drvdata(&pdev->dev, mcasp);
+
+ mcasp_reparent_fck(pdev);
+
ret = snd_soc_register_component(&pdev->dev, &davinci_mcasp_component,
&davinci_mcasp_dai[pdata->op_mode], 1);