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imx: mx7ulp: Implement the clock functions for i2c driver 

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@nxp.com>
Signed-off-by: Ye Li <ye.li@nxp.com>
Reviewed-by: Stefano Babic <sbabic@denx.de>
This commit is contained in:
Ye Li 2017-02-22 16:21:44 +08:00 committed by Stefano Babic
parent 1b409828b1
commit d4dcee2213
2 changed files with 44 additions and 0 deletions
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40
arch/arm/cpu/armv7/mx7ulp/clock.c
View File

@ -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) {

4
arch/arm/include/asm/arch-mx7ulp/clock.h
View File

@ -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