[U-Boot] [PATCH 07/18] imx: mx7ulp: Implement the clock functions for i2c driver

[Peng Fan]

From: Ye Li <ye.li at nxp.com>

Implement the i2c clock enable and get function for mx7ulp. These
functions are required by imx_lpi2c driver.

Signed-off-by: Peng Fan <peng.fan at nxp.com>
Signed-off-by: Ye Li <ye.li at nxp.com>
Cc: Stefano Babic <sbabic at denx.de>
---
 arch/arm/cpu/armv7/mx7ulp/clock.c        | 40 ++++++++++++++++++++++++++++++++
 arch/arm/include/asm/arch-mx7ulp/clock.h |  4 ++++
 2 files changed, 44 insertions(+)

diff --git a/arch/arm/cpu/armv7/mx7ulp/clock.c b/arch/arm/cpu/armv7/mx7ulp/clock.c
index 0c34d88..30db67d 100644
--- a/arch/arm/cpu/armv7/mx7ulp/clock.c
+++ b/arch/arm/cpu/armv7/mx7ulp/clock.c
@@ -73,6 +73,46 @@ u32 get_lpuart_clk(void)
 	return pcc_clock_get_rate(lpuart_pcc_clks[index - 4]);
 }
 
+#ifdef CONFIG_SYS_LPI2C_IMX
+int enable_i2c_clk(unsigned char enable, unsigned i2c_num)
+{
+	/* Set parent to FIRC DIV2 clock */
+	const enum pcc_clk lpi2c_pcc_clks[] = {
+		PER_CLK_LPI2C4,
+		PER_CLK_LPI2C5,
+		PER_CLK_LPI2C6,
+		PER_CLK_LPI2C7,
+	};
+
+	if (i2c_num < 4 || i2c_num > 7)
+		return -EINVAL;
+
+	if (enable) {
+		pcc_clock_enable(lpi2c_pcc_clks[i2c_num - 4], false);
+		pcc_clock_sel(lpi2c_pcc_clks[i2c_num - 4], SCG_FIRC_DIV2_CLK);
+		pcc_clock_enable(lpi2c_pcc_clks[i2c_num - 4], true);
+	} else {
+		pcc_clock_enable(lpi2c_pcc_clks[i2c_num - 4], false);
+	}
+	return 0;
+}
+
+u32 imx_get_i2cclk(unsigned i2c_num)
+{
+	const enum pcc_clk lpi2c_pcc_clks[] = {
+		PER_CLK_LPI2C4,
+		PER_CLK_LPI2C5,
+		PER_CLK_LPI2C6,
+		PER_CLK_LPI2C7,
+	};
+
+	if (i2c_num < 4 || i2c_num > 7)
+		return 0;
+
+	return pcc_clock_get_rate(lpi2c_pcc_clks[i2c_num - 4]);
+}
+#endif
+
 unsigned int mxc_get_clock(enum mxc_clock clk)
 {
 	switch (clk) {
diff --git a/arch/arm/include/asm/arch-mx7ulp/clock.h b/arch/arm/include/asm/arch-mx7ulp/clock.h
index f21052e..ebf32c6 100644
--- a/arch/arm/include/asm/arch-mx7ulp/clock.h
+++ b/arch/arm/include/asm/arch-mx7ulp/clock.h
@@ -27,6 +27,10 @@ enum mxc_clock {
 
 u32 mxc_get_clock(enum mxc_clock clk);
 u32 get_lpuart_clk(void);
+#ifdef CONFIG_SYS_LPI2C_IMX
+int enable_i2c_clk(unsigned char enable, unsigned i2c_num);
+u32 imx_get_i2cclk(unsigned i2c_num);
+#endif
 #ifdef CONFIG_MXC_OCOTP
 void enable_ocotp_clk(unsigned char enable);
 #endif
-- 
2.6.2