[U-Boot] [PATCH V2 07/20] imx: mx7ulp: Implement the clock functions for i2c driver

[Stefano Babic]

On 27/12/2016 11:04, Peng Fan wrote:
> 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>
> ---
> 
> 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
> 


Reviewed-by : Stefano Babic <sbabic at denx.de>

Best regards,
Stefano Babic

-- 
=====================================================================
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: +49-8142-66989-53 Fax: +49-8142-66989-80 Email: sbabic at denx.de
=====================================================================