+Lucasz
On 10/11/20 2:35 pm, Tero Kristo wrote:
> Add new clk subcommand "clk setfreq", for setting up a clock rate
> directly from u-boot cmdline. This is handy for any debugging purposes
> towards clocks.
>
> Signed-off-by: Tero Kristo <t-kri...@ti.com>
> ---
> cmd/clk.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++--
> 1 file changed, 47 insertions(+), 2 deletions(-)
>
> diff --git a/cmd/clk.c b/cmd/clk.c
> index 0245b97136..fd7944c02e 100644
> --- a/cmd/clk.c
> +++ b/cmd/clk.c
> @@ -98,8 +98,52 @@ static int do_clk_dump(struct cmd_tbl *cmdtp, int flag,
> int argc,
> return ret;
> }
>
> +struct udevice *clk_lookup(const char *name)
> +{
> + int i = 0;
> + struct udevice *dev;
> +
> + do {
> + uclass_get_device(UCLASS_CLK, i++, &dev);
> + if (!strcmp(name, dev->name))
> + return dev;
> + } while (dev);
> +
> + return NULL;
> +}
> +
> +static int do_clk_setfreq(struct cmd_tbl *cmdtp, int flag, int argc,
> + char *const argv[])
> +{
> + struct clk *clk = NULL;
> + s32 freq;
> + struct udevice *dev;
> +
> + freq = simple_strtoul(argv[2], NULL, 10);
> +
> + dev = clk_lookup(argv[1]);
> +
> + if (dev)
> + clk = dev_get_clk_ptr(dev);
> +
> + if (!clk) {
> + printf("clock '%s' not found.\n", argv[1]);
> + return -EINVAL;
> + }
> +
> + freq = clk_set_rate(clk, freq);
> + if (freq < 0) {
> + printf("set_rate failed: %d\n", freq);
> + return CMD_RET_FAILURE;
> + }
> +
> + printf("set_rate returns %u\n", freq);
> + return 0;
> +}
> +
> static struct cmd_tbl cmd_clk_sub[] = {
> U_BOOT_CMD_MKENT(dump, 1, 1, do_clk_dump, "", ""),
> + U_BOOT_CMD_MKENT(setfreq, 3, 1, do_clk_setfreq, "", ""),
> };
>
> static int do_clk(struct cmd_tbl *cmdtp, int flag, int argc,
> @@ -124,7 +168,8 @@ static int do_clk(struct cmd_tbl *cmdtp, int flag, int
> argc,
>
> #ifdef CONFIG_SYS_LONGHELP
> static char clk_help_text[] =
> - "dump - Print clock frequencies";
> + "dump - Print clock frequencies\n"
> + "setfreq [clk] [freq] - Set clock frequency";
> #endif
>
> -U_BOOT_CMD(clk, 2, 1, do_clk, "CLK sub-system", clk_help_text);
> +U_BOOT_CMD(clk, 4, 1, do_clk, "CLK sub-system", clk_help_text);
>
