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Message-ID: <AM6PR04MB496646B173420B26DD3D8D8380299@AM6PR04MB4966.eurprd04.prod.outlook.com>
Date: Fri, 21 May 2021 06:14:11 +0000
From: Aisheng Dong <aisheng.dong@....com>
To: Clark Wang <xiaoning.wang@....com>,
"robh+dt@...nel.org" <robh+dt@...nel.org>,
"shawnguo@...nel.org" <shawnguo@...nel.org>,
"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
"festevam@...il.com" <festevam@...il.com>
CC: "kernel@...gutronix.de" <kernel@...gutronix.de>,
dl-linux-imx <linux-imx@....com>,
"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH V2 02/18] i2c: imx-lpi2c: add ipg clk for lpi2c driver
> From: Clark Wang <xiaoning.wang@....com>
> Sent: Tuesday, April 6, 2021 7:33 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.
>
> Signed-off-by: Gao Pan <pandy.gao@....com>
> Signed-off-by: Clark Wang <xiaoning.wang@....com>
> Acked-by: Fugang Duan <fugang.duan@....com>
You can drop the original Ack or signed-off if there're significant changes
BTW, please move the binding doc change before this patch.
> ---
> V2 changes:
> - Merge two clocks' prepare funtions to lpi2c_imx_clocks_prepare().
> ---
> drivers/i2c/busses/i2c-imx-lpi2c.c | 61 +++++++++++++++++++++---------
> 1 file changed, 44 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c
> b/drivers/i2c/busses/i2c-imx-lpi2c.c
> index bbf44ac95021..89b7b0795f51 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;
> @@ -207,7 +208,7 @@ static int lpi2c_imx_config(struct lpi2c_imx_struct
> *lpi2c_imx)
>
> lpi2c_imx_set_mode(lpi2c_imx);
>
> - clk_rate = clk_get_rate(lpi2c_imx->clk);
> + clk_rate = clk_get_rate(lpi2c_imx->clk_per);
> if (lpi2c_imx->mode == HS || lpi2c_imx->mode == ULTRA_FAST)
> filt = 0;
> else
> @@ -538,6 +539,34 @@ static const struct of_device_id lpi2c_imx_of_match[]
> = { }; MODULE_DEVICE_TABLE(of, lpi2c_imx_of_match);
>
> +static int lpi2c_imx_clocks_prepare(struct lpi2c_imx_struct *lpi2c_imx)
> +{
> + int ret = 0;
Unnecessary initialization
> +
> + ret = clk_prepare_enable(lpi2c_imx->clk_per);
> + if (ret) {
> + dev_err(lpi2c_imx->adapter.dev.parent,
> + "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(lpi2c_imx->adapter.dev.parent,
> + "can't enable I2C ipg clock, ret=%d\n", ret);
> + return ret;
> + }
> +
> + return ret;
Return 0
> +}
> +
> +static void lpi2c_imx_clocks_unprepare(struct lpi2c_imx_struct
> +*lpi2c_imx) {
> + clk_disable_unprepare(lpi2c_imx->clk_ipg);
> + clk_disable_unprepare(lpi2c_imx->clk_per);
> +}
> +
> static int lpi2c_imx_probe(struct platform_device *pdev) {
> struct lpi2c_imx_struct *lpi2c_imx;
> @@ -563,10 +592,16 @@ 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);
> + }
Will this patch break imx7ulp which doesn't have per clock?
> +
> + 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);
> }
>
> ret = of_property_read_u32(pdev->dev.of_node,
> @@ -584,11 +619,9 @@ static int lpi2c_imx_probe(struct platform_device
> *pdev)
> i2c_set_adapdata(&lpi2c_imx->adapter, lpi2c_imx);
> platform_set_drvdata(pdev, lpi2c_imx);
>
> - ret = clk_prepare_enable(lpi2c_imx->clk);
> - if (ret) {
> - dev_err(&pdev->dev, "clk enable failed %d\n", ret);
> + ret = lpi2c_imx_clocks_prepare(lpi2c_imx);
> + if (ret)
> return ret;
> - }
>
> pm_runtime_set_autosuspend_delay(&pdev->dev, I2C_PM_TIMEOUT);
> pm_runtime_use_autosuspend(&pdev->dev);
> @@ -635,7 +668,7 @@ 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);
> + lpi2c_imx_clocks_unprepare(lpi2c_imx);
> pinctrl_pm_select_sleep_state(dev);
>
> return 0;
> @@ -644,16 +677,10 @@ static int __maybe_unused
> lpi2c_runtime_suspend(struct device *dev) static int __maybe_unused
> lpi2c_runtime_resume(struct device *dev) {
> struct lpi2c_imx_struct *lpi2c_imx = dev_get_drvdata(dev);
> - int ret;
>
> pinctrl_pm_select_default_state(dev);
> - ret = clk_prepare_enable(lpi2c_imx->clk);
> - if (ret) {
> - dev_err(dev, "failed to enable I2C clock, ret=%d\n", ret);
> - return ret;
> - }
>
> - return 0;
> + return lpi2c_imx_clocks_prepare(lpi2c_imx);
> }
>
> static const struct dev_pm_ops lpi2c_pm_ops = {
> --
> 2.25.1
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