[U-Boot] [PATCH V3 3/4] clk: support clk tree dump

[Peng Fan]

The previous code only dump the clk list. This patch is
to support clk tree dump, and also dump the enable_cnt.

The code used in patch is similar to dm_dump_all, but
the code here only filter out the UCLASS_CLK devices.

On i.MX8MM, Partial output:
u-boot=> clk dump
 Rate               Usecnt      Name
------------------------------------------
 24000000             0        |-- clock-osc-24m
 24000000             0        |   |-- dram_pll_ref_sel
 750000000            0        |   |   `-- dram_pll
 750000000            0        |   |       `-- dram_pll_bypass
 750000000            0        |   |           `-- dram_pll_out
 24000000             0        |   |-- arm_pll_ref_sel
 1200000000           0        |   |   `-- arm_pll
 1200000000           0        |   |       `-- arm_pll_bypass
 1200000000           0        |   |           `-- arm_pll_out
 1200000000           0        |   |               `-- arm_a53_src
 1200000000           0        |   |                   `-- arm_a53_cg
 1200000000           0        |   |                       `-- arm_a53_div
 24000000             4        |   |-- sys_pll1_ref_sel
 800000000            4        |   |   `-- sys_pll1
 800000000            4        |   |       `-- sys_pll1_bypass
 800000000            4        |   |           `-- sys_pll1_out
 40000000             0        |   |               |-- sys_pll1_40m

Signed-off-by: Peng Fan <peng.fan at nxp.com>
---

V3:
 Fix build break for some platforms
V2:
 Improve commit log

 cmd/clk.c | 79 +++++++++++++++++++++++++++++++++++++++------------------------
 1 file changed, 49 insertions(+), 30 deletions(-)

diff --git a/cmd/clk.c b/cmd/clk.c
index 5402c87de7..74ad868500 100644
--- a/cmd/clk.c
+++ b/cmd/clk.c
@@ -7,51 +7,70 @@
 #include <clk.h>
 #if defined(CONFIG_DM) && defined(CONFIG_CLK)
 #include <dm.h>
+#include <dm/device.h>
+#include <dm/root.h>
 #include <dm/device-internal.h>
+#include <linux/clk-provider.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;
-	ulong rate;
-
-	/* 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)
-			goto noclk;
+static void show_clks(struct udevice *dev, int depth, int last_flag)
+{
+	int i, is_last;
+	struct udevice *child;
+	struct clk *clkp;
+	u32 rate;
+
+	clkp = dev_get_clk_ptr(dev);
+	if (device_get_uclass_id(dev) == UCLASS_CLK && clkp) {
+		rate = clk_get_rate(clkp);
+
+	printf(" %-12u  %8d        ", rate, clkp->enable_count);
+
+	for (i = depth; i >= 0; i--) {
+		is_last = (last_flag >> i) & 1;
+		if (i) {
+			if (is_last)
+				printf("    ");
+			else
+				printf("|   ");
+		} else {
+			if (is_last)
+				printf("`-- ");
+			else
+				printf("|-- ");
+		}
+	}
 
-		ret = clk_request(dev, &clk);
-		if (ret)
-			goto noclk;
+	printf("%s\n", dev->name);
+	}
 
-		rate = clk_get_rate(&clk);
-		clk_free(&clk);
+	list_for_each_entry(child, &dev->child_head, sibling_node) {
+		is_last = list_is_last(&child->sibling_node, &dev->child_head);
+		show_clks(child, depth + 1, (last_flag << 1) | is_last);
+	}
+}
 
-		if (rate == -ENODEV)
-			goto noclk;
+int __weak soc_clk_dump(void)
+{
+	struct udevice *root;
 
-		printf("%-30.30s : %lu Hz\n", dev->name, rate);
-		continue;
-	noclk:
-		printf("%-30.30s : ? Hz\n", dev->name);
+	root = dm_root();
+	if (root) {
+		printf(" Rate               Usecnt      Name\n");
+		printf("------------------------------------------\n");
+		show_clks(root, -1, 0);
 	}
 
 	return 0;
+}
 #else
+int __weak soc_clk_dump(void)
+{
 	puts("Not implemented\n");
 	return 1;
-#endif
 }
+#endif
 
 static int do_clk_dump(cmd_tbl_t *cmdtp, int flag, int argc,
 		       char *const argv[])
-- 
2.16.4