On Tue, May 01, 2012 at 09:44:48PM +0800, Shawn Guo wrote:
> On Fri, Apr 27, 2012 at 03:02:57PM +0800, Richard Zhao wrote:
> > From: Richard Zhao <richard.zhao@xxxxxxxxxx>
> >
> > It tries to clk_get the clock. And if it failed, it assumes the clock
> > by default enabled.
> >
> > Signed-off-by: Richard Zhao <richard.zhao@xxxxxxxxxxxxx>
> > ---
> > sound/soc/fsl/imx-sgtl5000.c | 40 ++++++++++++++++++++++++++++++++--------
> > 1 files changed, 32 insertions(+), 8 deletions(-)
> >
> > diff --git a/sound/soc/fsl/imx-sgtl5000.c b/sound/soc/fsl/imx-sgtl5000.c
> > index 73b935e..3a729ca 100644
> > --- a/sound/soc/fsl/imx-sgtl5000.c
> > +++ b/sound/soc/fsl/imx-sgtl5000.c
> > @@ -13,6 +13,8 @@
> > #include <linux/module.h>
> > #include <linux/of.h>
> > #include <linux/of_platform.h>
> > +#include <linux/of_i2c.h>
> > +#include <linux/clk.h>
> > #include <sound/soc.h>
> >
> > #include "../codecs/sgtl5000.h"
> > @@ -25,6 +27,7 @@ struct imx_sgtl5000_data {
> > struct snd_soc_card card;
> > char codec_dai_name[DAI_NAME_SIZE];
> > char platform_name[DAI_NAME_SIZE];
> > + struct clk *codec_clk;
> > unsigned int clk_frequency;
> > };
> >
> > @@ -58,6 +61,7 @@ static int __devinit imx_sgtl5000_probe(struct platform_device *pdev)
> > struct device_node *np = pdev->dev.of_node;
> > struct device_node *ssi_np, *codec_np;
> > struct platform_device *ssi_pdev;
> > + struct i2c_client *codec_dev;
> > struct imx_sgtl5000_data *data;
> > int int_port, ext_port;
> > int ret;
> > @@ -113,6 +117,11 @@ static int __devinit imx_sgtl5000_probe(struct platform_device *pdev)
> > ret = -EINVAL;
> > goto fail;
> > }
> > + codec_dev = of_find_i2c_device_by_node(codec_np);
> > + if (!codec_dev) {
> > + dev_err(&pdev->dev, "failed to find codec platform device\n");
> > + return -EINVAL;
> > + }
>
> What if the codec is accessed via SPI bus on some machines?
>
> >
> > data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
> > if (!data) {
> > @@ -120,11 +129,20 @@ static int __devinit imx_sgtl5000_probe(struct platform_device *pdev)
> > goto fail;
> > }
> >
> > - ret = of_property_read_u32(codec_np, "clock-frequency",
> > - &data->clk_frequency);
> > - if (ret) {
> > - dev_err(&pdev->dev, "clock-frequency missing or invalid\n");
> > - goto fail;
> > + data->codec_clk = clk_get(&codec_dev->dev, NULL);
>
> It's a clock of sgtl5000 codec. I feel it makes more sense to have
> sgtl5000 device driver than machine driver to manage this clock.
The ASoC machine driver handled the clock settings, I just followed the
same way, using snd_soc_dai_set_sysclk to set codec clk. But what you
said is reasonable. I also find it's impossible to use devm_get_clk.
Mark, do you suggest get clk in ASoC machine driver or in codec driver?
Thanks
Richard
>
> Regards,
> Shawn
>
> > + if (IS_ERR(data->codec_clk)) {
> > + /* assuming clock enabled by default */
> > + data->codec_clk = NULL;
> > + ret = of_property_read_u32(codec_np, "clock-frequency",
> > + &data->clk_frequency);
> > + if (ret) {
> > + dev_err(&codec_dev->dev,
> > + "clock-frequency missing or invalid\n");
> > + goto fail;
> > + }
> > + } else {
> > + data->clk_frequency = clk_get_rate(data->codec_clk);
> > + clk_prepare_enable(data->codec_clk);
> > }
>
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