[U-Boot] [PATCH v1 3/4] i.MX6: add enable_spi_clk()

[Stefano Babic <sbabic@denx.de>]

Hi Heiko,


On 28/05/2014 12:16, Heiko Schocher wrote:
> add enable_spi_clk(), so board code can enable spi clocks.
> 
> Signed-off-by: Heiko Schocher <hs@denx.de>
> Cc: Eric Nelson <eric.nelson@boundarydevices.com>
> Cc: Stefano Babic <sbabic@denx.de>
> ---
>  arch/arm/cpu/armv7/mx6/clock.c        | 17 +++++++++++++++++
>  arch/arm/include/asm/arch-mx6/clock.h |  1 +
>  2 files changed, 18 insertions(+)
> 
> diff --git a/arch/arm/cpu/armv7/mx6/clock.c b/arch/arm/cpu/armv7/mx6/clock.c
> index bd65a08..4735368 100644
> --- a/arch/arm/cpu/armv7/mx6/clock.c
> +++ b/arch/arm/cpu/armv7/mx6/clock.c
> @@ -71,6 +71,23 @@ int enable_i2c_clk(unsigned char enable, unsigned i2c_num)
>  }
>  #endif
>  
> +int enable_spi_clk(unsigned char enable, unsigned spi_num)

Add a comment here to understand that spi_num starts from 0.

> +{
> +	u32 reg;
> +	u32 mask;
> +
> +	if (spi_num > 3)
> +		return -EINVAL;

The maximum number should be a #define in imx-regs.h, in case we will
reuse the code with a new variation of the SOC.

> +
> +	mask = MXC_CCM_CCGR_CG_MASK << (spi_num << 1);



> +	reg = __raw_readl(&imx_ccm->CCGR1);
> +	if (enable)
> +		reg |= mask;
> +	else
> +		reg &= ~mask;
> +	__raw_writel(reg, &imx_ccm->CCGR1);
> +	return 0;
> +}
>  static u32 decode_pll(enum pll_clocks pll, u32 infreq)
>  {
>  	u32 div;
> diff --git a/arch/arm/include/asm/arch-mx6/clock.h b/arch/arm/include/asm/arch-mx6/clock.h
> index 1b4ded7..339c789 100644
> --- a/arch/arm/include/asm/arch-mx6/clock.h
> +++ b/arch/arm/include/asm/arch-mx6/clock.h
> @@ -57,6 +57,7 @@ void enable_usboh3_clk(unsigned char enable);
>  int enable_sata_clock(void);
>  int enable_pcie_clock(void);
>  int enable_i2c_clk(unsigned char enable, unsigned i2c_num);
> +int enable_spi_clk(unsigned char enable, unsigned spi_num);
>  void enable_ipu_clock(void);
>  int enable_fec_anatop_clock(enum enet_freq freq);
>  #endif /* __ASM_ARCH_CLOCK_H */
> 

Best regards,
Stefano Babic

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