Optional DT property to specify the desired parent clock for the McASP fck clock.
Signed-off-by: Peter Ujfalusi peter.ujfalusi@ti.com --- .../bindings/sound/davinci-mcasp-audio.txt | 3 +- sound/soc/davinci/davinci-mcasp.c | 44 ++++++++++++++++++++++ 2 files changed, 46 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt b/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt index 990fa71..569b26c 100644 --- a/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt +++ b/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt @@ -37,7 +37,8 @@ Optional properties: - pinctrl-0: Should specify pin control group used for this controller. - pinctrl-names: Should contain only one value - "default", for more details please refer to pinctrl-bindings.txt - +- fck_parent : Should contain a valid clock name which will be used as parent + for the McASP fck
Example:
diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c index fc8c13d..09aabac 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> @@ -835,6 +836,46 @@ static const struct of_device_id mcasp_dt_ids[] = { }; 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) { @@ -1064,6 +1105,9 @@ static int davinci_mcasp_probe(struct platform_device *pdev) 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);