[U-Boot] [PATCH V3 24/27] imx8m: soc: probe clock device in arch_cpu_init_dm

[Patrick Wildt <patrick@blueri.se>]

On Tue, Aug 27, 2019 at 06:25:58AM +0000, Peng Fan wrote:
> Because we need to get cpu freq in print_cpuinfo at very early stage,
> so we need to make sure the ccm be probed.
> 
> Signed-off-by: Peng Fan <peng.fan@nxp.com>
> ---
>  arch/arm/mach-imx/imx8m/soc.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/arch/arm/mach-imx/imx8m/soc.c b/arch/arm/mach-imx/imx8m/soc.c
> index 3a54db4898..f904049120 100644
> --- a/arch/arm/mach-imx/imx8m/soc.c
> +++ b/arch/arm/mach-imx/imx8m/soc.c
> @@ -14,6 +14,7 @@
>  #include <asm/mach-imx/boot_mode.h>
>  #include <asm/mach-imx/syscounter.h>
>  #include <asm/armv8/mmu.h>
> +#include <dm/uclass.h>
>  #include <errno.h>
>  #include <fdt_support.h>
>  #include <fsl_wdog.h>
> @@ -228,6 +229,22 @@ static void imx_set_wdog_powerdown(bool enable)
>  	writew(enable, &wdog3->wmcr);
>  }
>  
> +int arch_cpu_init_dm(void)
> +{
> +	struct udevice *dev;
> +	int ret;
> +
> +	ret = uclass_get_device_by_name(UCLASS_CLK,
> +					"clock-controller at 30380000",
> +					&dev);
> +	if (ret < 0) {
> +		printf("Failed to find clock node. Check device tree\n");
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
>  int arch_cpu_init(void)
>  {
>  	struct ocotp_regs *ocotp = (struct ocotp_regs *)OCOTP_BASE_ADDR;
> -- 
> 2.16.4
> 
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This commit broke my i.MX8MQ board.  This is because the i.MX8MQ does
not yet have a DM-based clock driver like i.MX8MM, so requiring the
existence of such uclass device breaks i.MX8MQ.  I would propse the
following commit, which make the whole function only available for
i.MX8MQ.

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