[alsa-devel] [PATCH] ASoC: Atmel: ClassD: Set GCK's parent clock
Set GCK's parent clock as audio clock, make sure the GCK's parent clock is audio clock.
Signed-off-by: Songjun Wu songjun.wu@atmel.com ---
sound/soc/atmel/atmel-classd.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/sound/soc/atmel/atmel-classd.c b/sound/soc/atmel/atmel-classd.c index 8276675..2f5190b 100644 --- a/sound/soc/atmel/atmel-classd.c +++ b/sound/soc/atmel/atmel-classd.c @@ -588,6 +588,12 @@ static int atmel_classd_probe(struct platform_device *pdev) return ret; }
+ ret = clk_set_parent(dd->gclk, dd->aclk); + if (ret) { + dev_err(dev, "failed to set GCK parent clock: %d\n", ret); + return ret; + } + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { dev_err(dev, "no memory resource\n");
On Thu, Nov 19, 2015 at 11:26:30AM +0800, Songjun Wu wrote:
Set GCK's parent clock as audio clock, make sure the GCK's parent clock is audio clock.
- ret = clk_set_parent(dd->gclk, dd->aclk);
- if (ret) {
dev_err(dev, "failed to set GCK parent clock: %d\n", ret);return ret;- }
Why are we doing this in the driver? This should be done by whatever creates the clock tree, not by the driver that uses the clocks - that way if some future SoC has a different clock tree the driver will continue to work.
On 11/21/2015 02:08, Mark Brown wrote:
On Thu, Nov 19, 2015 at 11:26:30AM +0800, Songjun Wu wrote:
Set GCK's parent clock as audio clock, make sure the GCK's parent clock is audio clock.
- ret = clk_set_parent(dd->gclk, dd->aclk);
- if (ret) {
dev_err(dev, "failed to set GCK parent clock: %d\n", ret);return ret;- }
Why are we doing this in the driver? This should be done by whatever creates the clock tree, not by the driver that uses the clocks - that way if some future SoC has a different clock tree the driver will continue to work.
You are right. The GCK's parent clock should be assigned in device tree, not in the driver. The DT binding for classD should be modified to set the GCK's parent clock as audio clock. Thank you.
participants (3)
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Mark Brown -
Songjun Wu -
Wu, Songjun