[U-Boot] [PATCH v2] i2c: mxc: add CONFIG_CLK support

[Peng Fan]

When CONFIG_CLK enabled, use CLK UCLASS for clk related settings.

Signed-off-by: Peng Fan <peng.fan at nxp.com>
---

V2:
 use clk_get_rate when getting i2c per clk rate with CLK UCLASS

 arch/arm/include/asm/mach-imx/mxc_i2c.h |  6 ++++++
 drivers/i2c/mxc_i2c.c                   | 22 ++++++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/arch/arm/include/asm/mach-imx/mxc_i2c.h b/arch/arm/include/asm/mach-imx/mxc_i2c.h
index 8e1ea9af19..81fd981444 100644
--- a/arch/arm/include/asm/mach-imx/mxc_i2c.h
+++ b/arch/arm/include/asm/mach-imx/mxc_i2c.h
@@ -6,6 +6,9 @@
 #define __ASM_ARCH_MXC_MXC_I2C_H__
 #include <asm-generic/gpio.h>
 #include <asm/mach-imx/iomux-v3.h>
+#if CONFIG_IS_ENABLED(CLK)
+#include <clk.h>
+#endif
 
 struct i2c_pin_ctrl {
 	iomux_v3_cfg_t i2c_mode;
@@ -47,6 +50,9 @@ struct mxc_i2c_bus {
 	ulong driver_data;
 	int speed;
 	struct i2c_pads_info *pads_info;
+#if CONFIG_IS_ENABLED(CLK)
+	struct clk per_clk;
+#endif
 #ifndef CONFIG_DM_I2C
 	int (*idle_bus_fn)(void *p);
 	void *idle_bus_data;
diff --git a/drivers/i2c/mxc_i2c.c b/drivers/i2c/mxc_i2c.c
index 23119cce65..8d6b4650ff 100644
--- a/drivers/i2c/mxc_i2c.c
+++ b/drivers/i2c/mxc_i2c.c
@@ -149,7 +149,12 @@ static uint8_t i2c_imx_get_clk(struct mxc_i2c_bus *i2c_bus, unsigned int rate)
 #endif
 
 	/* Divider value calculation */
+#if CONFIG_IS_ENABLED(CLK)
+	i2c_clk_rate = clk_get_rate(&i2c_bus->per_clk);
+#else
 	i2c_clk_rate = mxc_get_clock(MXC_I2C_CLK);
+#endif
+
 	div = (i2c_clk_rate + rate - 1) / rate;
 	if (div < i2c_clk_div[0][0])
 		clk_div = 0;
@@ -890,9 +895,22 @@ static int mxc_i2c_probe(struct udevice *bus)
 	i2c_bus->bus = bus;
 
 	/* Enable clk */
+#if CONFIG_IS_ENABLED(CLK)
+	ret = clk_get_by_index(bus, 0, &i2c_bus->per_clk);
+	if (ret) {
+		printf("Failed to get i2c clk\n");
+		return ret;
+	}
+	ret = clk_enable(&i2c_bus->per_clk);
+	if (ret) {
+		printf("Failed to enable i2c clk\n");
+		return ret;
+	}
+#else
 	ret = enable_i2c_clk(1, bus->seq);
 	if (ret < 0)
 		return ret;
+#endif
 
 	/*
 	 * See Documentation/devicetree/bindings/i2c/i2c-imx.txt
@@ -919,7 +937,11 @@ static int mxc_i2c_probe(struct udevice *bus)
 	ret = i2c_idle_bus(i2c_bus);
 	if (ret < 0) {
 		/* Disable clk */
+#if CONFIG_IS_ENABLED(CLK)
+		clk_disable(&i2c_bus->per_clk);
+#else
 		enable_i2c_clk(0, bus->seq);
+#endif
 		return ret;
 	}
 
-- 
2.16.4