[U-Boot] [PATCH 2/2] i2c: imx_lpi2c: add uclass api support

[Peng Fan]

Use uclass clk api to get per clk when CONFIG_CLK enabled.

Signed-off-by: Peng Fan <peng....@nxp.com>
---
 drivers/i2c/imx_lpi2c.c | 47 ++++++++++++++++++++++++++++++++++++++++-------
 include/imx_lpi2c.h     |  3 +++
 2 files changed, 43 insertions(+), 7 deletions(-)
diff --git a/drivers/i2c/imx_lpi2c.c b/drivers/i2c/imx_lpi2c.c
index ff07ca34aa..6c343072fb 100644
--- a/drivers/i2c/imx_lpi2c.c
+++ b/drivers/i2c/imx_lpi2c.c
@@ -261,8 +261,14 @@ static int bus_i2c_write(struct udevice *bus, u32 chip, u8 
*buf, int len)
 }
 
 
+u32 __weak imx_get_i2cclk(u32 i2c_num)
+{
+       return 0;
+}
+
 static int bus_i2c_set_bus_speed(struct udevice *bus, int speed)
 {
+       struct imx_lpi2c_bus *i2c_bus = dev_get_priv(bus);
        struct imx_lpi2c_reg *regs;
        u32 val;
        u32 preescale = 0, best_pre = 0, clkhi = 0;
@@ -273,9 +279,18 @@ static int bus_i2c_set_bus_speed(struct udevice *bus, int 
speed)
        int i;
 
        regs = (struct imx_lpi2c_reg *)devfdt_get_addr(bus);
-       clock_rate = imx_get_i2cclk(bus->seq);
-       if (!clock_rate)
-               return -EPERM;
+
+       if (IS_ENABLED(CONFIG_CLK)) {
+               clock_rate = clk_get_rate(&i2c_bus->per_clk);
+               if (clock_rate <= 0) {
+                       dev_err(bus, "Failed to get i2c clk: %d\n", clock_rate);
+                       return clock_rate;
+               }
+       } else {
+               clock_rate = imx_get_i2cclk(bus->seq);
+               if (!clock_rate)
+                       return -EPERM;
+       }
 
        mode = (readl(&regs->mcr) & LPI2C_MCR_MEN_MASK) >> LPI2C_MCR_MEN_SHIFT;
        /* disable master mode */
@@ -417,6 +432,11 @@ static int imx_lpi2c_set_bus_speed(struct udevice *bus, 
unsigned int speed)
        return bus_i2c_set_bus_speed(bus, speed);
 }
 
+__weak int enable_i2c_clk(unsigned char enable, unsigned int i2c_num)
+{
+       return 0;
+}
+
 static int imx_lpi2c_probe(struct udevice *bus)
 {
        struct imx_lpi2c_bus *i2c_bus = dev_get_priv(bus);
@@ -440,10 +460,23 @@ static int imx_lpi2c_probe(struct udevice *bus)
                return ret;
        }
 
-       /* To i.MX7ULP, only i2c4-7 can be handled by A7 core */
-       ret = enable_i2c_clk(1, bus->seq);
-       if (ret < 0)
-               return ret;
+       if (IS_ENABLED(CONFIG_CLK)) {
+               ret = clk_get_by_name(bus, "per", &i2c_bus->per_clk);
+               if (ret) {
+                       dev_err(bus, "Failed to get per clk\n");
+                       return ret;
+               }
+               ret = clk_enable(&i2c_bus->per_clk);
+               if (ret) {
+                       dev_err(bus, "Failed to enable per clk\n");
+                       return ret;
+               }
+       } else {
+               /* To i.MX7ULP, only i2c4-7 can be handled by A7 core */
+               ret = enable_i2c_clk(1, bus->seq);
+               if (ret < 0)
+                       return ret;
+       }
 
        ret = bus_i2c_init(bus, 100000);
        if (ret < 0)
diff --git a/include/imx_lpi2c.h b/include/imx_lpi2c.h
index 3fbb40bdd1..2700e5f876 100644
--- a/include/imx_lpi2c.h
+++ b/include/imx_lpi2c.h
@@ -8,6 +8,8 @@
 #ifndef __IMX_LPI2C_H__
 #define __IMX_LPI2C_H__
 
+#include <clk.h>
+
 struct imx_lpi2c_bus {
        int index;
        ulong base;
@@ -15,6 +17,7 @@ struct imx_lpi2c_bus {
        int speed;
        struct i2c_pads_info *pads_info;
        struct udevice *bus;
+       struct clk per_clk;
 };
 
 struct imx_lpi2c_reg {
-- 
2.14.1

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