We are adding more and more drivers to driver model these days.
Compared with the ad-hoc driver system, it seems pretty difficult to
understand how drivers are working on driver model. For ex.
- Which devices have been bound?
- Which devices have been probed?
- Which is the parent of this device?
etc.
I hope this tool will help us test/review driver model patches.
Just hit "showdev" on the command line and it will list all the bound
devices in a tree-like format with Class and Probed flag.
=> showdev
Class Probed Name
----------------------------------------
root [ + ] root_driver
demo [ ] |-- demo_shape_drv
demo [ ] |-- demo_simple_drv
demo [ ] |-- demo_shape_drv
demo [ ] |-- demo_simple_drv
demo [ ] |-- demo_shape_drv
test [ ] |-- test_drv
test [ ] |-- test_drv
test [ ] |-- test_drv
gpio [ ] |-- gpio_sandbox
serial [ ] |-- serial_sandbox
serial [ + ] |-- serial
demo [ ] |-- triangle
demo [ ] |-- square
demo [ ] |-- hexagon
gpio [ ] |-- gpios
i2c [ + ] |-- i2c@0
i2c_eeprom [ + ] | |-- eeprom@2c
i2c_emul [ + ] | | \-- emul
i2c_generic [ + ] | \-- generic_59
spi [ ] |-- spi@0
spi_emul [ ] | \-- flash@0
cros_ec [ + ] \-- cros-ec@0
Signed-off-by: Masahiro Yamada <yamad...@jp.panasonic.com>
---
common/Makefile | 1 +
common/cmd_showdev.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 73 insertions(+)
create mode 100644 common/cmd_showdev.c
diff --git a/common/Makefile b/common/Makefile
index 6cc4de8..c26c764 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -84,6 +84,7 @@ obj-$(CONFIG_CMD_CPLBINFO) += cmd_cplbinfo.o
obj-$(CONFIG_DATAFLASH_MMC_SELECT) += cmd_dataflash_mmc_mux.o
obj-$(CONFIG_CMD_DATE) += cmd_date.o
obj-$(CONFIG_CMD_DEMO) += cmd_demo.o
+obj-$(CONFIG_CMD_SHOWDEV) += cmd_showdev.o
obj-$(CONFIG_CMD_SOUND) += cmd_sound.o
ifdef CONFIG_4xx
obj-$(CONFIG_CMD_SETGETDCR) += cmd_dcr.o
diff --git a/common/cmd_showdev.c b/common/cmd_showdev.c
new file mode 100644
index 0000000..6761865
--- /dev/null
+++ b/common/cmd_showdev.c
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2014 Panasonic Corporation
+ * Author: Masahiro Yamada <yamad...@jp.panasonic.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <linux/string.h>
+#include <linux/list.h>
+#include <dm/device.h>
+#include <dm/uclass.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define INDENT1 " "
+#define INDENT2 "| "
+#define INDENT3 "\\-- "
+#define INDENT4 "|-- "
+
+static void show_devices(struct udevice *dev, int depth, int last_flag)
+{
+ int i, is_last;
+ struct udevice *child;
+ char class_name[12];
+
+ /* print the first 11 characters to not break the tree-format. */
+ strlcpy(class_name, dev->uclass->uc_drv->name, sizeof(class_name));
+ printf(" %-11s ", class_name);
+
+ printf("[ %c ] ", dev->flags & DM_FLAG_ACTIVATED ? '+' : ' ');
+
+ for (i = depth; i >= 0; i--) {
+ is_last = (last_flag >> i) & 1;
+ if (i) {
+ if (is_last)
+ printf(INDENT1);
+ else
+ printf(INDENT2);
+ } else {
+ if (is_last)
+ printf(INDENT3);
+ else
+ printf(INDENT4);
+ }
+ }
+
+ printf("%s\n", dev->name);
+
+ list_for_each_entry(child, &dev->child_head, sibling_node) {
+ last_flag <<= 1;
+ last_flag |= list_is_last(&child->sibling_node,
+ &dev->child_head);
+ show_devices(child, depth + 1, last_flag);
+ }
+}
+
+static int do_showdev(cmd_tbl_t *cmdtp, int flag, int argc, char * const
argv[])
+{
+ printf(" Class Probed Name\n");
+ printf("----------------------------------------\n");
+
+ show_devices(gd->dm_root, -1, 0);
+
+ return 0;
+}
+
+U_BOOT_CMD(
+ showdev, 1, 1, do_showdev,
+ "show devices in a tree-like format.",
+ ""
+);
--
1.9.1
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