[U-Boot] [PATCH 2/2] armv8/fsl-lsch3: consolidate the clock system initialization

[Prabhakar Kushwaha]

> -----Original Message-----
> From: Zhiqiang Hou [mailto:Zhiqiang.Hou at nxp.com]
> Sent: Monday, September 12, 2016 9:39 AM
> To: u-boot at lists.denx.de; albert.u.boot at aribaud.net; york sun
> <york.sun at nxp.com>; Vincent Hu <mingkai.hu at nxp.com>; Prabhakar
> Kushwaha <prabhakar.kushwaha at nxp.com>; Calvin Johnson
> <calvin.johnson at nxp.com>
> Cc: Z.Q. Hou <zhiqiang.hou at nxp.com>
> Subject: [PATCH 2/2] armv8/fsl-lsch3: consolidate the clock system initialization
> 
> From: Hou Zhiqiang <Zhiqiang.Hou at nxp.com>
> 
> This patch map the sys_info->freq_systembus to Platform PLL, and
> implement the IPs' clock function individually.
> 
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou at nxp.com>
> ---
>  .../arm/cpu/armv8/fsl-layerscape/fsl_lsch3_speed.c | 26 +++++++++++++++++--
> ---
>  .../include/asm/arch-fsl-layerscape/immap_lsch3.h  |  1 +
>  include/configs/ls2080a_common.h                   |  2 +-
>  3 files changed, 22 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/arm/cpu/armv8/fsl-layerscape/fsl_lsch3_speed.c
> b/arch/arm/cpu/armv8/fsl-layerscape/fsl_lsch3_speed.c
> index a9b12a4..daad80a 100644
> --- a/arch/arm/cpu/armv8/fsl-layerscape/fsl_lsch3_speed.c
> +++ b/arch/arm/cpu/armv8/fsl-layerscape/fsl_lsch3_speed.c
> @@ -88,11 +88,10 @@ void get_sys_info(struct sys_info *sys_info)
>  #endif
>  #endif
> 
> +	/* The freq_systembus is used to record frequency of platform PLL */
>  	sys_info->freq_systembus *= (gur_in32(&gur->rcwsr[0]) >>
>  			FSL_CHASSIS3_RCWSR0_SYS_PLL_RAT_SHIFT) &
>  			FSL_CHASSIS3_RCWSR0_SYS_PLL_RAT_MASK;
> -	/* Platform clock is half of platform PLL */
> -	sys_info->freq_systembus /= 2;

This is required only for ls2080A and ls2088A otherwise u-boot will be printing dicken speed in boot log.

>  	sys_info->freq_ddrbus *= (gur_in32(&gur->rcwsr[0]) >>
>  			FSL_CHASSIS3_RCWSR0_MEM_PLL_RAT_SHIFT) &
>  			FSL_CHASSIS3_RCWSR0_MEM_PLL_RAT_MASK;
> @@ -132,7 +131,7 @@ void get_sys_info(struct sys_info *sys_info)
>  	ccr = ifc_in32(&ifc_regs.gregs->ifc_ccr);
>  	ccr = ((ccr & IFC_CCR_CLK_DIV_MASK) >> IFC_CCR_CLK_DIV_SHIFT) + 1;
> 
> -	sys_info->freq_localbus = sys_info->freq_systembus / ccr;
> +	sys_info->freq_localbus = sys_info->freq_systembus / 2 / ccr;
>  #endif
>  }
> 
> @@ -159,7 +158,7 @@ int get_clocks(void)
> 
>  /********************************************
>   * get_bus_freq
> - * return system bus freq in Hz
> + * return platform PLL freq in Hz
>   *********************************************/
>  ulong get_bus_freq(ulong dummy)
>  {
> @@ -190,13 +189,28 @@ ulong get_ddr_freq(ulong ctrl_num)
>  	return gd->mem_clk;
>  }
> 
> +int get_i2c_freq(ulong dummy)
> +{
> +	return  get_bus_freq(0) / 4;
> +}
> +
> +int get_dspi_freq(ulong dummy)
> +{
> +	return  get_bus_freq(0) / 4;
> +}
> +
> +int get_serial_clock(void)
> +{
> +	return get_bus_freq(0) / 4;
> +}
> +

get_bus_freq(0) / 4  --> May not be true for LS1088A. So Avoid this for above code. 

--prabhakar