[U-Boot] [PATCH 3/4] mx5: Add NAND clock handling

["Benoît Thébaudeau" <benoit.thebaudeau@advansee.com>]

Dear Marek Vasut,

On Monday, February 25, 2013 7:19:56 PM, Marek Vasut wrote:
> Augment the MX5 clock code with function to enable and configure
> NFC clock. This is necessary to get NFC working on MX5.
> 
> Signed-off-by: Marek Vasut <marex@denx.de>
> Cc: Beno?t Th?baudeau <benoit.thebaudeau@advansee.com>
> Cc: Fabio Estevam <fabio.estevam@freescale.com>
> Cc: Stefano Babic <sbabic@denx.de>
> ---
>  arch/arm/cpu/armv7/mx5/clock.c        |   12 ++++++++++--
>  arch/arm/include/asm/arch-mx5/clock.h |    1 +
>  2 files changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm/cpu/armv7/mx5/clock.c b/arch/arm/cpu/armv7/mx5/clock.c
> index 76c2c52..f768fc9 100644
> --- a/arch/arm/cpu/armv7/mx5/clock.c
> +++ b/arch/arm/cpu/armv7/mx5/clock.c
> @@ -739,10 +739,11 @@ static int config_core_clk(u32 ref, u32 freq)
>  static int config_nfc_clk(u32 nfc_clk)
>  {
>  	u32 parent_rate = get_emi_slow_clk();
> -	u32 div = parent_rate / nfc_clk;
> +	u32 div;
>  
> -	if (nfc_clk <= 0)
> +	if (nfc_clk == 0)
>  		return -EINVAL;
> +	div = parent_rate / nfc_clk;
>  	if (div == 0)
>  		div++;
>  	if (parent_rate / div > NFC_CLK_MAX)
> @@ -755,6 +756,13 @@ static int config_nfc_clk(u32 nfc_clk)
>  	return 0;
>  }
>  
> +void enable_nfc_clk(unsigned char enable)
> +{
> +	unsigned int cg = enable ? MXC_CCM_CCGR_CG_ON : MXC_CCM_CCGR_CG_OFF;
> +
> +	clrsetbits_le32(&mxc_ccm->CCGR5, MXC_CCM_CCGR_CG_MASK << 20, cg << 20);

Please use MXC_CCM_CCGR5_EMI_ENFC(MXC_CCM_CCGR_CG_MASK) and
MXC_CCM_CCGR_CG_MASK(cg).

> +}
> +
>  /* Config main_bus_clock for periphs */
>  static int config_periph_clk(u32 ref, u32 freq)
>  {
> diff --git a/arch/arm/include/asm/arch-mx5/clock.h
> b/arch/arm/include/asm/arch-mx5/clock.h
> index 9cdfb48..6910192 100644
> --- a/arch/arm/include/asm/arch-mx5/clock.h
> +++ b/arch/arm/include/asm/arch-mx5/clock.h
> @@ -68,5 +68,6 @@ void set_usboh3_clk(void);
>  void enable_usboh3_clk(unsigned char enable);
>  void mxc_set_sata_internal_clock(void);
>  int enable_i2c_clk(unsigned char enable, unsigned i2c_num);
> +void enable_nfc_clk(unsigned char enable);
>  
>  #endif /* __ASM_ARCH_CLOCK_H */
> --
> 1.7.10.4
> 
> 

Best regards,
Beno?t