[U-Boot] [PATCH V2 2/9] mx6: add clock enabling functions

[Igor Grinberg]

Hi Nikita,

On 08/07/14 16:05, Nikita Kiryanov wrote:
> Add functions to enable/disable clocks for UART, SPI, ENET, and MMC.
> 
> Cc: Stefano Babic <sbabic at denx.de>
> Signed-off-by: Nikita Kiryanov <nikita at compulab.co.il>
> ---
> Changes in V2:
> 	- No changes.
> 
>  arch/arm/cpu/armv7/mx6/clock.c        | 99 +++++++++++++++++++++++++++++++++++
>  arch/arm/include/asm/arch-mx6/clock.h |  5 ++
>  2 files changed, 104 insertions(+)
> 
> diff --git a/arch/arm/cpu/armv7/mx6/clock.c b/arch/arm/cpu/armv7/mx6/clock.c
> index 7dd83ec..696dc98 100644
> --- a/arch/arm/cpu/armv7/mx6/clock.c
> +++ b/arch/arm/cpu/armv7/mx6/clock.c
> @@ -36,6 +36,35 @@ void enable_ocotp_clk(unsigned char enable)
>  }
>  #endif
>  

[...]

> +#ifdef CONFIG_FEC_MXC
> +void enable_enet_clk(unsigned char enable)
> +{
> +	u32 reg;
> +
> +	reg = __raw_readl(&imx_ccm->CCGR1);
> +	if (enable)
> +		reg |= MXC_CCM_CCGR1_ENET_CLK_ENABLE_MASK;
> +	else
> +		reg &= ~(MXC_CCM_CCGR1_ENET_CLK_ENABLE_MASK);
> +	__raw_writel(reg, &imx_ccm->CCGR1);
> +}
> +#endif
> +
> +#ifdef CONFIG_MXC_UART
> +void enable_uart_clk(unsigned char enable)
> +{
> +	u32 reg, mask;
> +
> +	reg = __raw_readl(&imx_ccm->CCGR5);
> +	mask = MXC_CCM_CCGR5_UART_MASK | MXC_CCM_CCGR5_UART_SERIAL_MASK;
> +	if (enable)
> +		reg |= mask;
> +	else
> +		reg &= ~mask;
> +	__raw_writel(reg, &imx_ccm->CCGR5);
> +}
> +#endif
> +
> +#ifdef CONFIG_SPI
> +/* spi_num can be from 0 - 4 */
> +int enable_cspi_clock(unsigned char enable, unsigned spi_num)
> +{
> +	u32 reg, mask;
> +
> +	if (spi_num > 4)
> +		return -EINVAL;
> +
> +	mask = MXC_CCM_CCGR_CG_MASK << (spi_num * 2);
> +	reg = readl(&imx_ccm->CCGR1);
> +	if (enable)
> +		reg |= mask;
> +	else
> +		reg &= ~mask;
> +
> +	__raw_writel(reg, &imx_ccm->CCGR1);
> +	return 0;
> +}
> +#endif
> +
> +#ifdef CONFIG_MMC
> +int enable_usdhc_clk(unsigned char enable, unsigned bus_num)
> +{
> +	u32 reg, mask;
> +
> +	if (bus_num > 3)
> +		return -EINVAL;
> +
> +	mask = MXC_CCM_CCGR_CG_MASK << (bus_num * 2 + 2);
> +	reg = readl(&imx_ccm->CCGR6);
> +	if (enable)
> +		reg |= mask;
> +	else
> +		reg &= ~mask;
> +
> +	__raw_writel(reg, &imx_ccm->CCGR6);
> +	return 0;
> +}
> +#endif

In all the above functions, can we use the clrsetbits_le32() helpers?

[...]

-- 
Regards,
Igor.