[U-Boot] [PATCH 7/9] ARM: sunxi: Allow specifying module in prcm apb0 init function

[Ian Campbell <ijc@hellion.org.uk>]

On Tue, 2014-10-07 at 15:11 +0800, Chen-Yu Tsai wrote:
> The prcm apb0 controls multiple modules. Allow specifying which
> modules to enable clocks and de-assert resets so the function
> can be reused.

How come this isn't actually called on sun6i?

(naughty of me not to notice this when it was submitted!)

Is it going to be called by anything in this series? I have a feeling
this is a precursor for SPL which should have been left out of the sun6i
series, but oh well what's done is done.

Without a caller it's hard to make a judgement call on parameters vs
#ifdef in the function, although my inclination would generally be
towards parameters, if there's just going to be an ifdef at the call
site instead it's not really buying us much.

> Signed-off-by: Chen-Yu Tsai <wens@csie.org>
> ---
>  arch/arm/cpu/armv7/sunxi/prcm.c        | 12 +++++++-----
>  arch/arm/include/asm/arch-sunxi/prcm.h |  2 +-
>  2 files changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/arm/cpu/armv7/sunxi/prcm.c b/arch/arm/cpu/armv7/sunxi/prcm.c
> index 7b3ee89..19b4938 100644
> --- a/arch/arm/cpu/armv7/sunxi/prcm.c
> +++ b/arch/arm/cpu/armv7/sunxi/prcm.c
> @@ -21,13 +21,15 @@
>  #include <asm/arch/prcm.h>
>  #include <asm/arch/sys_proto.h>
>  
> -void prcm_init_apb0(void)
> +/* APB0 clock gate and reset bit offsets are the same. */

Is this absolutely guaranteed?

> +void prcm_apb0_enable(u32 flags)
>  {
>  	struct sunxi_prcm_reg *prcm =
>  		(struct sunxi_prcm_reg *)SUNXI_PRCM_BASE;
>  
> -	setbits_le32(&prcm->apb0_gate, PRCM_APB0_GATE_P2WI |
> -				       PRCM_APB0_GATE_PIO);
> -	setbits_le32(&prcm->apb0_reset, PRCM_APB0_RESET_P2WI |
> -					PRCM_APB0_RESET_PIO);
> +	/* open the clock for module */
> +	setbits_le32(&prcm->apb0_gate, flags);
> +
> +	/* deassert reset for module */
> +	setbits_le32(&prcm->apb0_reset, flags);
>  }
> diff --git a/arch/arm/include/asm/arch-sunxi/prcm.h b/arch/arm/include/asm/arch-sunxi/prcm.h
> index 1b40f09..3d3bfa6 100644
> --- a/arch/arm/include/asm/arch-sunxi/prcm.h
> +++ b/arch/arm/include/asm/arch-sunxi/prcm.h
> @@ -233,6 +233,6 @@ struct sunxi_prcm_reg {
>  	u32 dram_tst;		/* 0x190 */
>  };
>  
> -void prcm_init_apb0(void);
> +void prcm_apb0_enable(u32 flags);
>  #endif /* __ASSEMBLY__ */
>  #endif /* _PRCM_H */