> -----Original Message-----
> From: Aisheng Dong <aisheng.dong@xxxxxxx>
> Sent: Friday, March 19, 2021 12:46
> To: Clark Wang <xiaoning.wang@xxxxxxx>; shawnguo@xxxxxxxxxx;
> s.hauer@xxxxxxxxxxxxxx
> Cc: kernel@xxxxxxxxxxxxxx; festevam@xxxxxxxxx; dl-linux-imx <linux-
> imx@xxxxxxx>; sumit.semwal@xxxxxxxxxx; christian.koenig@xxxxxxx;
> linux-i2c@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linux-
> kernel@xxxxxxxxxxxxxxx
> Subject: RE: [PATCH 03/11] i2c: imx-lpi2c: add ipg clk for lpi2c driver
>
> > From: Clark Wang <xiaoning.wang@xxxxxxx>
> > Sent: Wednesday, March 17, 2021 2:54 PM
> >
> > The lpi2c IP needs two clks: ipg clk and per clk. The old lpi2c driver
> > missed ipg clk. This patch adds ipg clk for lpi2c driver.
> >
>
> Pleas also update dt-binding and sent along with this patchset.(before this
> one)
Okay, thanks.
>
> > Signed-off-by: Gao Pan <pandy.gao@xxxxxxx>
> > Signed-off-by: Clark Wang <xiaoning.wang@xxxxxxx>
> > Acked-by: Fugang Duan <fugang.duan@xxxxxxx>
>
> You can drop the Ack tag if the patch was changed
>
> > ---
> > drivers/i2c/busses/i2c-imx-lpi2c.c | 28 +++++++++++++++++++++-------
> > 1 file changed, 21 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c
> > b/drivers/i2c/busses/i2c-imx-lpi2c.c
> > index 1e920e7ac7c1..664fcc0dba51 100644
> > --- a/drivers/i2c/busses/i2c-imx-lpi2c.c
> > +++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
> > @@ -94,7 +94,8 @@ enum lpi2c_imx_pincfg {
> >
> > struct lpi2c_imx_struct {
> > struct i2c_adapter adapter;
> > - struct clk *clk;
> > + struct clk *clk_per;
> > + struct clk *clk_ipg;
> > void __iomem *base;
> > __u8 *rx_buf;
> > __u8 *tx_buf;
> > @@ -563,10 +564,16 @@ static int lpi2c_imx_probe(struct
> > platform_device
> > *pdev)
> > strlcpy(lpi2c_imx->adapter.name, pdev->name,
> > sizeof(lpi2c_imx->adapter.name));
> >
> > - lpi2c_imx->clk = devm_clk_get(&pdev->dev, NULL);
> > - if (IS_ERR(lpi2c_imx->clk)) {
> > + lpi2c_imx->clk_per = devm_clk_get(&pdev->dev, "per");
> > + if (IS_ERR(lpi2c_imx->clk_per)) {
> > dev_err(&pdev->dev, "can't get I2C peripheral clock\n");
> > - return PTR_ERR(lpi2c_imx->clk);
> > + return PTR_ERR(lpi2c_imx->clk_per);
> > + }
> > +
> > + lpi2c_imx->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
> > + if (IS_ERR(lpi2c_imx->clk_ipg)) {
> > + dev_err(&pdev->dev, "can't get I2C ipg clock\n");
> > + return PTR_ERR(lpi2c_imx->clk_ipg);
> > }
>
> Will this break exist dts?
It will not break the build. But will break the lpi2c probe for imx7ulp and
imx8qxp/qm.
I will send two patches to update dts in V2.
Best Regards,
Clark Wang
>
> Regards
> Aisheng
>
> >
> > ret = of_property_read_u32(pdev->dev.of_node,
> > @@ -633,7 +640,8 @@ static int __maybe_unused
> > lpi2c_runtime_suspend(struct device *dev) {
> > struct lpi2c_imx_struct *lpi2c_imx = dev_get_drvdata(dev);
> >
> > - clk_disable_unprepare(lpi2c_imx->clk);
> > + clk_disable_unprepare(lpi2c_imx->clk_ipg);
> > + clk_disable_unprepare(lpi2c_imx->clk_per);
> > pinctrl_pm_select_idle_state(dev);
> >
> > return 0;
> > @@ -645,12 +653,18 @@ static int __maybe_unused
> > lpi2c_runtime_resume(struct device *dev)
> > int ret;
> >
> > pinctrl_pm_select_default_state(dev);
> > - ret = clk_prepare_enable(lpi2c_imx->clk);
> > + ret = clk_prepare_enable(lpi2c_imx->clk_per);
> > if (ret) {
> > - dev_err(dev, "can't enable I2C clock, ret=%d\n", ret);
> > + dev_err(dev, "can't enable I2C per clock, ret=%d\n", ret);
> > return ret;
> > }
> >
> > + ret = clk_prepare_enable(lpi2c_imx->clk_ipg);
> > + if (ret) {
> > + clk_disable_unprepare(lpi2c_imx->clk_per);
> > + dev_err(dev, "can't enable I2C ipg clock, ret=%d\n", ret);
> > + }
> > +
> > return ret;
> > }
> >
> > --
> > 2.25.1
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