From: Tero Kristo t-kristo@ti.com
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.
Acked-by: Lukasz Majewski lukma@denx.de Signed-off-by: Tero Kristo t-kristo@ti.com Signed-off-by: Tero Kristo kristo@kernel.org --- 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);