[U-Boot] [RFC][PATCH] cmd: clk: Add trivial implementation of clock dump for DM

[Marek Vasut]

Add trivial implementation of the clk dump in case DM is enabled.
This implementation just iterates over all the clock registered
with the CLK uclass and prints their rate.

Signed-off-by: Marek Vasut <marex at denx.de>
Cc: Chin Liang See <chin.liang.see at intel.com>
Cc: Dinh Nguyen <dinguyen at kernel.org>
Cc: Ley Foon Tan <ley.foon.tan at intel.com>
Cc: Simon Glass <sjg at chromium.org>
Cc: Tom Rini <trini at konsulko.com>
---
 cmd/clk.c | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/cmd/clk.c b/cmd/clk.c
index 73fb25092b..fd4231589c 100644
--- a/cmd/clk.c
+++ b/cmd/clk.c
@@ -5,11 +5,48 @@
 #include <common.h>
 #include <command.h>
 #include <clk.h>
+#if defined(CONFIG_DM) && defined(CONFIG_CLK)
+#include <dm.h>
+#include <dm/device-internal.h>
+#endif
 
 int __weak soc_clk_dump(void)
 {
+#if defined(CONFIG_DM) && defined(CONFIG_CLK)
+	struct udevice *dev;
+	struct uclass *uc;
+	struct clk clk;
+	int ret;
+
+	/* Device addresses start at 1 */
+	ret = uclass_get(UCLASS_CLK, &uc);
+	if (ret)
+		return ret;
+
+	uclass_foreach_dev(dev, uc) {
+		memset(&clk, 0, sizeof(clk));
+		ret = device_probe(dev);
+		if (ret) {
+			printf("%-30.30s : ? Hz\n", dev->name);
+			continue;
+		}
+
+		ret = clk_request(dev, &clk);
+		if (ret) {
+			printf("%-30.30s : ? Hz\n", dev->name);
+			continue;
+		}
+
+		printf("%-30.30s : %lu Hz\n", dev->name, clk_get_rate(&clk));
+
+		clk_free(&clk);
+	}
+
+	return 0;
+#else
 	puts("Not implemented\n");
 	return 1;
+#endif
 }
 
 static int do_clk_dump(cmd_tbl_t *cmdtp, int flag, int argc,
-- 
2.16.2