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Message-ID: <42ab6ee6bdad6157a9d24197cd9d0311da0423e7.camel@mediatek.com>
Date: Thu, 17 Mar 2022 17:14:42 +0800
From: Leilk Liu <leilk.liu@...iatek.com>
To: AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
"Mark Brown" <broonie@...nel.org>
CC: Rob Herring <robh+dt@...nel.org>,
Matthias Brugger <matthias.bgg@...il.com>,
<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-spi@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH V4 6/6] spi: mediatek: support hclk
On Tue, 2022-03-15 at 10:37 +0100, AngeloGioacchino Del Regno wrote:
> Il 15/03/22 04:24, Leilk Liu ha scritto:
> > this patch adds hclk support.
> >
> > Signed-off-by: Leilk Liu <leilk.liu@...iatek.com>
> > ---
> > drivers/spi/spi-mt65xx.c | 85 ++++++++++++++++++++++++++++++++---
> > -----
> > 1 file changed, 69 insertions(+), 16 deletions(-)
> >
> > diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c
> > index 8958c3fa4fea..d4a602e78aa7 100644
> > --- a/drivers/spi/spi-mt65xx.c
> > +++ b/drivers/spi/spi-mt65xx.c
> > @@ -130,7 +130,7 @@ struct mtk_spi {
> > u32 state;
> > int pad_num;
> > u32 *pad_sel;
> > - struct clk *parent_clk, *sel_clk, *spi_clk;
> > + struct clk *parent_clk, *sel_clk, *spi_clk, *spi_hclk;
> > struct spi_transfer *cur_transfer;
> > u32 xfer_len;
> > u32 num_xfered;
> > @@ -1252,25 +1252,38 @@ static int mtk_spi_probe(struct
> > platform_device *pdev)
> > goto err_put_master;
> > }
> >
> > + mdata->spi_hclk = devm_clk_get(&pdev->dev, "hclk");
> > + if (!IS_ERR(mdata->spi_hclk)) {
>
> What you're doing here can be simplified by using
> devm_clk_get_optional() instead.
> Please use that.
Hi AngeloGioacchino, thanks for your suggestion, I'll fix it.
>
> > + ret = clk_prepare_enable(mdata->spi_hclk);
> > + if (ret < 0) {
> > + dev_err(&pdev->dev, "failed to enable hclk
> > (%d)\n", ret);
> > + goto err_put_master;
> > + }
> > + }
> > +
> > ret = clk_prepare_enable(mdata->spi_clk);
> > if (ret < 0) {
> > dev_err(&pdev->dev, "failed to enable spi_clk (%d)\n",
> > ret);
> > - goto err_put_master;
> > + goto err_disable_spi_hclk;
> > }
> >
> > ret = clk_set_parent(mdata->sel_clk, mdata->parent_clk);
> > if (ret < 0) {
> > dev_err(&pdev->dev, "failed to clk_set_parent (%d)\n",
> > ret);
> > - clk_disable_unprepare(mdata->spi_clk);
> > - goto err_put_master;
> > + goto err_disable_spi_clk;
> > }
> >
> > mdata->spi_clk_hz = clk_get_rate(mdata->spi_clk);
> >
> > - if (mdata->dev_comp->no_need_unprepare)
> > + if (mdata->dev_comp->no_need_unprepare) {
> > clk_disable(mdata->spi_clk);
> > - else
> > + if (!IS_ERR(mdata->spi_hclk))
> > + clk_disable(mdata->spi_hclk);
> > + } else {
> > clk_disable_unprepare(mdata->spi_clk);
> > + if (!IS_ERR(mdata->spi_hclk))
> > + clk_disable_unprepare(mdata->spi_hclk);
> > + }
> >
> > pm_runtime_enable(&pdev->dev);
> >
> > @@ -1310,6 +1323,11 @@ static int mtk_spi_probe(struct
> > platform_device *pdev)
> >
> > err_disable_runtime_pm:
> > pm_runtime_disable(&pdev->dev);
> > +err_disable_spi_clk:
> > + clk_disable_unprepare(mdata->spi_clk);
> > +err_disable_spi_hclk:
> > + if (!IS_ERR(mdata->spi_hclk))
>
> When using devm_clk_get_optional(), you can simply omit this check,
> since it will
> be impossible to reach this point with an error pointer stored in
> spi_hclk.
OK, I'll fix it.
>
> > + clk_disable_unprepare(mdata->spi_hclk);
> > err_put_master:
> > spi_master_put(master);
> >
> > @@ -1325,8 +1343,11 @@ static int mtk_spi_remove(struct
> > platform_device *pdev)
> >
> > mtk_spi_reset(mdata);
> >
> > - if (mdata->dev_comp->no_need_unprepare)
> > + if (mdata->dev_comp->no_need_unprepare) {
> > clk_unprepare(mdata->spi_clk);
> > + if (!IS_ERR(mdata->spi_hclk))
> > + clk_unprepare(mdata->spi_hclk);
> > + }
> >
> > return 0;
> > }
> > @@ -1342,8 +1363,11 @@ static int mtk_spi_suspend(struct device
> > *dev)
> > if (ret)
> > return ret;
> >
> > - if (!pm_runtime_suspended(dev))
> > + if (!pm_runtime_suspended(dev)) {
> > clk_disable_unprepare(mdata->spi_clk);
> > + if (!IS_ERR(mdata->spi_hclk))
> > + clk_disable_unprepare(mdata->spi_hclk);
> > + }
> >
> > return ret;
> > }
> > @@ -1360,11 +1384,23 @@ static int mtk_spi_resume(struct device
> > *dev)
> > dev_err(dev, "failed to enable spi_clk (%d)\n",
> > ret);
> > return ret;
> > }
> > +
> > + if (!IS_ERR(mdata->spi_hclk)) {
>
> Since you will be using devm_clk_get_optional(), you can also omit
> this check.
OK, I'll fix it.
>
> > + clk_prepare_enable(mdata->spi_hclk);
>
> There's a typo. ret = clk_prepare_enable....
OK, I'll fix it.
>
> > + if (ret < 0) {
> > + dev_err(dev, "failed to enable spi_hclk
> > (%d)\n", ret);
> > + clk_disable_unprepare(mdata->spi_clk);
> > + return ret;
> > + }
> > + }
> > }
> >
> > ret = spi_master_resume(master);
> > - if (ret < 0)
> > + if (ret < 0) {
> > clk_disable_unprepare(mdata->spi_clk);
> > + if (!IS_ERR(mdata->spi_hclk))
>
> Same here and everywhere else, no error check if you set this as
> optional clock.
OK, I'll fix it.
>
> > + clk_disable_unprepare(mdata->spi_hclk);
> > + }
> >
> > return ret;
> > }
> > @@ -1376,10 +1412,15 @@ static int mtk_spi_runtime_suspend(struct
> > device *dev)
> > struct spi_master *master = dev_get_drvdata(dev);
> > struct mtk_spi *mdata = spi_master_get_devdata(master);
> >
> > - if (mdata->dev_comp->no_need_unprepare)
> > + if (mdata->dev_comp->no_need_unprepare) {
> > clk_disable(mdata->spi_clk);
> > - else
> > + if (!IS_ERR(mdata->spi_hclk))
> > + clk_disable(mdata->spi_hclk);
> > + } else {
> > clk_disable_unprepare(mdata->spi_clk);
> > + if (!IS_ERR(mdata->spi_hclk))
> > + clk_disable_unprepare(mdata->spi_hclk);
> > + }
> >
> > return 0;
> > }
> > @@ -1390,13 +1431,25 @@ static int mtk_spi_runtime_resume(struct
> > device *dev)
> > struct mtk_spi *mdata = spi_master_get_devdata(master);
> > int ret;
> >
> > - if (mdata->dev_comp->no_need_unprepare)
> > + if (mdata->dev_comp->no_need_unprepare) {
> > ret = clk_enable(mdata->spi_clk);
> > - else
> > + if (!IS_ERR(mdata->spi_hclk))
> > + clk_enable(mdata->spi_hclk);
> > + } else {
> > ret = clk_prepare_enable(mdata->spi_clk);
> > - if (ret < 0) {
> > - dev_err(dev, "failed to enable spi_clk (%d)\n", ret);
> > - return ret;
> > + if (ret < 0) {
> > + dev_err(dev, "failed to enable spi_clk (%d)\n",
> > ret);
> > + return ret;
> > + }
> > +
> > + if (!IS_ERR(mdata->spi_hclk)) {
> > + ret = clk_prepare_enable(mdata->spi_hclk);
> > + if (ret < 0) {
> > + dev_err(dev, "failed to enable spi_hclk
> > (%d)\n", ret);
> > + clk_disable_unprepare(mdata->spi_clk);
> > + return ret;
> > + }
> > + }
> > }
> >
> > return 0;
> >
>
>
> Regards,
> Angelo
>
>
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