From: Ye Li <ye...@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....@nxp.com>
Signed-off-by: Ye Li <ye...@nxp.com>
Cc: Stefano Babic <sba...@denx.de>
---
V2:
None
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
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