[U-Boot] [PATCH 1/3] ARM: socfpga: clk: Obtain handoff base clock via DM

[Ley Foon Tan <ley.foon.tan@intel.com>]

On Wed, 2018-08-08 at 22:11 +0200, Marek Vasut wrote:
> Bind fixed clock driver to the base clock instantiated in the handoff
> DT and use DM clock framework to get their clock rate. This replaces
> the ad-hoc DT parsing present thus far.
> 
> Signed-off-by: Marek Vasut <marex@denx.de>
> Cc: Chin Liang See <chin.liang.see@intel.com>
> Cc: Dinh Nguyen <dinguyen@kernel.org>
> Cc: Ley Foon Tan <ley.foon.tan@intel.com>
> ---
>  arch/arm/mach-socfpga/Kconfig                 |  2 ++
>  arch/arm/mach-socfpga/clock_manager_arria10.c | 41
> +++++++++++++++++++--------
>  2 files changed, 31 insertions(+), 12 deletions(-)
> 
> diff --git a/arch/arm/mach-socfpga/Kconfig b/arch/arm/mach-
> socfpga/Kconfig
> index 5c1df2cf1f..2655289a72 100644
> --- a/arch/arm/mach-socfpga/Kconfig
> +++ b/arch/arm/mach-socfpga/Kconfig
> @@ -11,6 +11,8 @@ config TARGET_SOCFPGA_ARRIA10
>  	bool
>  	select ALTERA_SDRAM
>  	select SPL_BOARD_INIT if SPL
> +	select CLK
> +	select SPL_CLK if SPL
>  
>  config TARGET_SOCFPGA_CYCLONE5
>  	bool
> diff --git a/arch/arm/mach-socfpga/clock_manager_arria10.c
> b/arch/arm/mach-socfpga/clock_manager_arria10.c
> index defa2f6261..59d3f9d50a 100644
> --- a/arch/arm/mach-socfpga/clock_manager_arria10.c
> +++ b/arch/arm/mach-socfpga/clock_manager_arria10.c
> @@ -7,6 +7,8 @@
>  #include <fdtdec.h>
>  #include <asm/io.h>
>  #include <dm.h>
> +#include <clk.h>
> +#include <dm/device-internal.h>
>  #include <asm/arch/clock_manager.h>
>  
>  static const struct socfpga_clock_manager *clock_manager_base =
> @@ -141,9 +143,9 @@ struct strtopu32 {
>  };
>  
>  const struct strtopu32 dt_to_val[] = {
> -	{ "/clocks/altera_arria10_hps_eosc1", &eosc1_hz},
> -	{ "/clocks/altera_arria10_hps_cb_intosc_ls", &cb_intosc_hz},
> -	{ "/clocks/altera_arria10_hps_f2h_free", &f2s_free_hz},
> +	{ "altera_arria10_hps_eosc1", &eosc1_hz },
> +	{ "altera_arria10_hps_cb_intosc_ls", &cb_intosc_hz },
> +	{ "altera_arria10_hps_f2h_free", &f2s_free_hz },
>  };
>  
>  static int of_to_struct(const void *blob, int node, const struct
> strtou32 *cfg_tab,
> @@ -163,28 +165,43 @@ static int of_to_struct(const void *blob, int
> node, const struct strtou32 *cfg_t
>  	return 0;
>  }
>  
> -static void of_get_input_clks(const void *blob)
> +static int of_get_input_clks(const void *blob)
>  {
> -	int node, i;
> +	struct udevice *dev;
> +	struct clk clk;
> +	int i, ret;
>  
>  	for (i = 0; i < ARRAY_SIZE(dt_to_val); i++) {
> -		node = fdt_path_offset(blob, dt_to_val[i].str);
> +		memset(&clk, 0, sizeof(clk));
>  
> -		if (node < 0)
> -			continue;
> +		ret = uclass_get_device_by_name(UCLASS_CLK,
> dt_to_val[i].str,
> +						&dev);
> +		if (ret)
> +			return ret;
>  
> -		fdtdec_get_int_array(blob, node, "clock-frequency",
> -				     dt_to_val[i].p, 1);
> +		ret = device_probe(dev);
uclass_get_device_by_name() will call to device_probe() function. So,
can remove this.
> +		if (ret)
> +			return ret;
> +
> +		ret = clk_request(dev, &clk);
> +		if (ret)
> +			return ret;
> +
> +		*dt_to_val[i].p = clk_get_rate(&clk);
>  	}
> +
> +	return 0;
>  }
>  
>  static int of_get_clk_cfg(const void *blob, struct mainpll_cfg
> *main_cfg,
>  			  struct perpll_cfg *per_cfg)
>  {
> -	int node, child, len;
> +	int ret, node, child, len;
>  	const char *node_name;
>  
> -	of_get_input_clks(blob);
> +	ret = of_get_input_clks(blob);
> +	if (ret)
> +		return ret;
>  
>  	node = fdtdec_next_compatible(blob, 0,
> COMPAT_ALTERA_SOCFPGA_CLK_INIT);
>