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.
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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