[U-Boot] [PATCH v3 04/22] vybrid: clock: Provide enable_i2c_clk() function for Vybrid

[Stefan Agner <stefan@agner.ch>]

On 03.02.2019 00:02, Lukasz Majewski wrote:
> Provide function to enable I2C clocks for vf610 - in the generic code.
> This function overrides the default weak function implementation (which
> only returns 1).
> 
> Signed-off-by: Lukasz Majewski <lukma@denx.de>

Reviewed-by: Stefan Agner <stefan.agner@toradex.com>

--
Stefan

> 
> ---
> 
> Changes in v3:
> - Add code to enable I2C0 code as suggested by Stefan (so the code can be
>   reused by other boards without regressions)
> - Exclude the pcm052.c related code to a separate patch
> 
> Changes in v2: None
> 
>  arch/arm/cpu/armv7/vf610/generic.c      | 22 ++++++++++++++++++++++
>  arch/arm/include/asm/arch-vf610/clock.h |  3 +++
>  2 files changed, 25 insertions(+)
> 
> diff --git a/arch/arm/cpu/armv7/vf610/generic.c
> b/arch/arm/cpu/armv7/vf610/generic.c
> index cbd3391918..e0c0b1bcb0 100644
> --- a/arch/arm/cpu/armv7/vf610/generic.c
> +++ b/arch/arm/cpu/armv7/vf610/generic.c
> @@ -375,3 +375,25 @@ void enable_caches(void)
>  	mmu_set_region_dcache_behaviour(IRAM_BASE_ADDR, IRAM_SIZE, option);
>  }
>  #endif
> +
> +#ifdef CONFIG_SYS_I2C_MXC
> +/* i2c_num can be from 0 - 3 */
> +int enable_i2c_clk(unsigned char enable, unsigned int i2c_num)
> +{
> +	struct ccm_reg *ccm = (struct ccm_reg *)CCM_BASE_ADDR;
> +
> +	switch (i2c_num) {
> +	case 0:
> +		clrsetbits_le32(&ccm->ccgr4, CCM_CCGR4_I2C0_CTRL_MASK,
> +				CCM_CCGR4_I2C0_CTRL_MASK);
> +	case 2:
> +		clrsetbits_le32(&ccm->ccgr10, CCM_CCGR10_I2C2_CTRL_MASK,
> +				CCM_CCGR10_I2C2_CTRL_MASK);
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +#endif
> diff --git a/arch/arm/include/asm/arch-vf610/clock.h
> b/arch/arm/include/asm/arch-vf610/clock.h
> index 3bd73a01f3..72184fd608 100644
> --- a/arch/arm/include/asm/arch-vf610/clock.h
> +++ b/arch/arm/include/asm/arch-vf610/clock.h
> @@ -22,6 +22,9 @@ enum mxc_clock {
>  void enable_ocotp_clk(unsigned char enable);
>  unsigned int mxc_get_clock(enum mxc_clock clk);
>  u32 get_lpuart_clk(void);
> +#ifdef CONFIG_SYS_I2C_MXC
> +int enable_i2c_clk(unsigned char enable, unsigned int i2c_num);
> +#endif
>  
>  #define imx_get_fecclk() mxc_get_clock(MXC_FEC_CLK)