[PATCH V2] davinci: da850: move input frequency to board specific files

[Kevin Hilman]

Christian Riesch <christian.riesch at omicron.at> writes:

> From: Bob Dunlop <bob.dunlop at xyzzy.org.uk>
>
> Currently the input frequency of the SoC is hardcoded in the SoC specific
> da850.c file to 24 MHz. Since the SoC accepts input frequencies in a wide
> range from 12 to 50 MHz, boards with different oscillator/crystal
> frequencies may be built.
>
> This patch allows setting a different input frequency in the board
> specific files to support boards with oscillator/crystal frequencies other
> than 24 MHz.
>
> Signed-off-by: Bob Dunlop <bob.dunlop at xyzzy.org.uk>
> Signed-off-by: Christian Riesch <christian.riesch at omicron.at>

Why not allow board code to just do a clk_set_rate()?

Currently the ref_clk struct clk does not have a .set_rate method
implemented, but that should be easy enough to add.  

Then the default ref_clk.rate would stay the 24MHz, but any boards that
want to override that simply use clk_get(), clk_set_rate(), clk_put()

Kevin

> ---
>
> Hi,
> in private email Bob Dunlop suggested to pass a pointer to a small 
> structure instead of the frequency value to allow future expansions, 
> e.g., for the OPP list. Therefore I submit his patch as V2.
> Christian
>
>  arch/arm/mach-davinci/board-da850-evm.c     |    2 +-
>  arch/arm/mach-davinci/board-mityomapl138.c  |    2 +-
>  arch/arm/mach-davinci/board-omapl138-hawk.c |    2 +-
>  arch/arm/mach-davinci/da850.c               |    5 ++++-
>  arch/arm/mach-davinci/include/mach/da8xx.h  |    6 +++++-
>  5 files changed, 12 insertions(+), 5 deletions(-)
>
> diff --git a/arch/arm/mach-davinci/board-da850-evm.c b/arch/arm/mach-davinci/board-da850-evm.c
> index a7b41bf..231ff87 100644
> --- a/arch/arm/mach-davinci/board-da850-evm.c
> +++ b/arch/arm/mach-davinci/board-da850-evm.c
> @@ -1252,7 +1252,7 @@ console_initcall(da850_evm_console_init);
>  
>  static void __init da850_evm_map_io(void)
>  {
> -	da850_init();
> +	da850_init(NULL);
>  }
>  
>  MACHINE_START(DAVINCI_DA850_EVM, "DaVinci DA850/OMAP-L138/AM18x EVM")
> diff --git a/arch/arm/mach-davinci/board-mityomapl138.c b/arch/arm/mach-davinci/board-mityomapl138.c
> index 606a6f2..362770c 100644
> --- a/arch/arm/mach-davinci/board-mityomapl138.c
> +++ b/arch/arm/mach-davinci/board-mityomapl138.c
> @@ -561,7 +561,7 @@ console_initcall(mityomapl138_console_init);
>  
>  static void __init mityomapl138_map_io(void)
>  {
> -	da850_init();
> +	da850_init(NULL);
>  }
>  
>  MACHINE_START(MITYOMAPL138, "MityDSP-L138/MityARM-1808")
> diff --git a/arch/arm/mach-davinci/board-omapl138-hawk.c b/arch/arm/mach-davinci/board-omapl138-hawk.c
> index 67c38d0..c43a6c3 100644
> --- a/arch/arm/mach-davinci/board-omapl138-hawk.c
> +++ b/arch/arm/mach-davinci/board-omapl138-hawk.c
> @@ -334,7 +334,7 @@ console_initcall(omapl138_hawk_console_init);
>  
>  static void __init omapl138_hawk_map_io(void)
>  {
> -	da850_init();
> +	da850_init(NULL);
>  }
>  
>  MACHINE_START(OMAPL138_HAWKBOARD, "AM18x/OMAP-L138 Hawkboard")
> diff --git a/arch/arm/mach-davinci/da850.c b/arch/arm/mach-davinci/da850.c
> index 133aac4..ebd0603 100644
> --- a/arch/arm/mach-davinci/da850.c
> +++ b/arch/arm/mach-davinci/da850.c
> @@ -1104,10 +1104,13 @@ static struct davinci_soc_info davinci_soc_info_da850 = {
>  	.reset_device		= &da8xx_wdt_device,
>  };
>  
> -void __init da850_init(void)
> +void __init da850_init(struct da850_init_board_info *board)
>  {
>  	unsigned int v;
>  
> +	if (board && board->ref_clk_rate)
> +		ref_clk.rate = board->ref_clk_rate;
> +
>  	davinci_common_init(&davinci_soc_info_da850);
>  
>  	da8xx_syscfg0_base = ioremap(DA8XX_SYSCFG0_BASE, SZ_4K);
> diff --git a/arch/arm/mach-davinci/include/mach/da8xx.h b/arch/arm/mach-davinci/include/mach/da8xx.h
> index ad64da7..66efc5d 100644
> --- a/arch/arm/mach-davinci/include/mach/da8xx.h
> +++ b/arch/arm/mach-davinci/include/mach/da8xx.h
> @@ -69,8 +69,12 @@ extern unsigned int da850_max_speed;
>  #define DA8XX_AEMIF_CTL_BASE	0x68000000
>  #define DA8XX_ARM_RAM_BASE	0xffff0000
>  
> +struct da850_init_board_info {
> +	unsigned long ref_clk_rate;
> +};
> +
>  void __init da830_init(void);
> -void __init da850_init(void);
> +void __init da850_init(struct da850_init_board_info *board);
>  
>  int da830_register_edma(struct edma_rsv_info *rsv);
>  int da850_register_edma(struct edma_rsv_info *rsv[2]);