> Subject: Re: [PATCH 1/2] ASoC: fsl_sai: Add clock control for SAI
>
> Hi Xiubo,
>
> On Fri, Apr 04, 2014 at 05:24:39PM +0800, Xiubo Li-B47053 wrote:
> > Hi,
> >
> > I have test this series on my Vybrid-TWR board and it works happily.
>
> You just checked the wrong version. I've sent a mail to let people disregard
> this version and a newer v2.
>
Sorry, I didn't receive these, I will search it in the web page.
> >
> > [...]
> > > diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
> > > index 3847d2a..2d749df 100644
> > > --- a/sound/soc/fsl/fsl_sai.c
> > > +++ b/sound/soc/fsl/fsl_sai.c
> > > @@ -428,5 +428,18 @@ static int fsl_sai_startup(struct snd_pcm_substream
> > > *substream,
> > > {
> > > struct fsl_sai *sai = snd_soc_dai_get_drvdata(cpu_dai);
> > > - u32 reg;
> > > + struct device *dev = &sai->pdev->dev;
> > > + u32 reg, ret;
> > > +
> >
> > I'd prefer:
> > + int ret;
>
> Just like last time I said, it would be converted to 'int' any way. There's
> no much difference between them.
>
Yes, it is...
I have ever encounter something like this in the feature maybe someone will
do the following check:
If (ret < 0)
...
Just one potential problem and one suggestion.
Thanks,
> >
> > > + ret = clk_prepare_enable(sai->ipg_clk);
> > > + if (ret) {
> > > + dev_err(dev, "failed to prepare and enable ipg clock\n");
> > > + return ret;
> > > + }
> > > +
> >
> > [...]
> >
> > > @@ -609,5 +630,5 @@ static int fsl_sai_probe(struct platform_device *pdev)
> > >
> > > sai->regmap = devm_regmap_init_mmio_clk(&pdev->dev,
> > > - "sai", base, &fsl_sai_regmap_config);
> > > + "ipg", base, &fsl_sai_regmap_config);
> > > if (IS_ERR(sai->regmap)) {
> > > dev_err(&pdev->dev, "regmap init failed\n");
> > > @@ -615,4 +636,16 @@ static int fsl_sai_probe(struct platform_device *pdev)
> > > }
> > >
> > > + sai->ipg_clk = devm_clk_get(&pdev->dev, "ipg");
> > > + if (IS_ERR(sai->ipg_clk)) {
> > > + dev_err(&pdev->dev, "failed to get ipg clock\n");
> > > + return PTR_ERR(sai->ipg_clk);
> > > + }
> > > +
> >
> > Since the 'ipg' clock is just intend to be used for registers accessing and
> > We are using the regmap_init_mmio_clk(), so we can just drop it here and
> > Let the regmap APIs to do the clock options properly.
>
> This 'ipg' clock, which I renamed in v2 to 'bus clock', is not just used
> in the way you said but also able to drive bit clock as your own code in
> the fsl_sai_set_dai_sysclk_tr(), and as reference manual describes:
>
> 52.3.1.3 Bus clock
> The bus clock is used by the control and configuration registers and to
> generate synchronous interrupts and DMA requests.
>
> Thanks,
> Nicolin
>
> >
> > Otherwise it look good to me.
> >
> > After this:
> > Acked-by: Xiubo Li <Li.Xiubo@xxxxxxxxxxxxx>
> >
> >
> >
> > Thanks,
> >
> > Brs,
> > Xiubo
> >
> >
> >
> >
> > > + sai->sai_clk = devm_clk_get(&pdev->dev, "sai");
> > > + if (IS_ERR(sai->sai_clk)) {
> > > + dev_err(&pdev->dev, "failed to get sai clock\n");
> > > + return PTR_ERR(sai->sai_clk);
> > > + }
> > > +
> > > irq = platform_get_irq(pdev, 0);
> > > if (irq < 0) {
> > > diff --git a/sound/soc/fsl/fsl_sai.h b/sound/soc/fsl/fsl_sai.h
> > > index 677670d..cbaf114 100644
> > > --- a/sound/soc/fsl/fsl_sai.h
> > > +++ b/sound/soc/fsl/fsl_sai.h
> > > @@ -127,4 +127,6 @@ struct fsl_sai {
> > > struct platform_device *pdev;
> > > struct regmap *regmap;
> > > + struct clk *ipg_clk;
> > > + struct clk *sai_clk;
> > >
> > > bool big_endian_regs;
> > > --
> > > 1.8.4
> > >
> >
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