[PATCH 03/11] i2c: imx-lpi2c: add ipg clk for lpi2c driver

[Clark Wang]

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....@nxp.com>
Signed-off-by: Clark Wang <xiaoning.w...@nxp.com>
Acked-by: Fugang Duan <fugang.d...@nxp.com>
---
 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);
        }
 
        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