common: cmd pmic: command cleanup

This commit cleanups the use of function: failed().
The new function name is: failure(), and it is used
for print errno and the errno-related message only.

The second change is choosing PMIC device by it's name,
instead of seq number. Thanks to this change, for set
the current device, call of pmic_get() is enough.

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Acked-by: Simon Glass <sjg@chromium.org>
Tested on sandbox:
Tested-by: Simon Glass <sjg@chromium.org>

common/cmd_pmic.c

@@ -10,75 +10,41 @@
 #include <dm/uclass-internal.h>
 #include <power/pmic.h>
 
-#define LIMIT_SEQ	3
+#define LIMIT_DEV	32
-#define LIMIT_DEVNAME	20
+#define LIMIT_PARENT	20
 
 static struct udevice *currdev;
 
-static int failed(const char *getset, const char *thing,
+static int failure(int ret)
-		  const char *for_dev, int ret)
 {
-	printf("Can't %s %s %s.\nError: %d (%s)\n", getset, thing, for_dev,
+	printf("Error: %d (%s)\n", ret, errno_str(ret));
-						    ret, errno_str(ret));
+
 	return CMD_RET_FAILURE;
 }
 
-static int pmic_dev_get(bool list_only, int get_seq, struct udevice **devp)
-{
-	struct udevice *dev;
-	int ret;
-
-	if (devp)
-		*devp = NULL;
-
-	for (ret = uclass_first_device(UCLASS_PMIC, &dev); dev;
-	     ret = uclass_next_device(&dev)) {
-		if (list_only) {
-			printf("|%*d | %-*.*s| %-*.*s| %s @ %d\n",
-			       LIMIT_SEQ, dev->seq,
-			       LIMIT_DEVNAME, LIMIT_DEVNAME, dev->name,
-			       LIMIT_DEVNAME, LIMIT_DEVNAME, dev->parent->name,
-			       dev_get_uclass_name(dev->parent),
-			       dev->parent->seq);
-			continue;
-		}
-
-		if (dev->seq == get_seq) {
-			if (devp)
-				*devp = dev;
-			else
-				return -EINVAL;
-
-			return 0;
-		}
-	}
-
-	if (list_only)
-		return ret;
-
-	return -ENODEV;
-}
-
 static int do_dev(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
-	int seq, ret = -ENODEV;
+	char *name;
+	int ret = -ENODEV;
 
 	switch (argc) {
 	case 2:
-		seq = simple_strtoul(argv[1], NULL, 0);
+		name = argv[1];
-		ret = uclass_get_device_by_seq(UCLASS_PMIC, seq, &currdev);
+		ret = pmic_get(name, &currdev);
-		if (ret && (ret = pmic_dev_get(false, seq, &currdev)))
+		if (ret) {
-			goto failed;
+			printf("Can't get PMIC: %s!\n", name);
+			return failure(ret);
+		}
 	case 1:
-		if (!currdev)
+		if (!currdev) {
-			goto failed;
+			printf("PMIC device is not set!\n\n");
+			return CMD_RET_USAGE;
+		}
 
 		printf("dev: %d @ %s\n", currdev->seq, currdev->name);
 	}
 
 	return CMD_RET_SUCCESS;
-failed:
-	return failed("get", "the", "device", ret);
 }
 
 static int do_list(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
@@ -86,18 +52,19 @@ static int do_list(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	struct udevice *dev;
 	int ret;
 
-	printf("|%*s | %-*.*s| %-*.*s| %s @ %s\n",
+	printf("| %-*.*s| %-*.*s| %s @ %s\n",
-	       LIMIT_SEQ, "Seq",
+	       LIMIT_DEV, LIMIT_DEV, "Name",
-	       LIMIT_DEVNAME, LIMIT_DEVNAME, "Name",
+	       LIMIT_PARENT, LIMIT_PARENT, "Parent name",
-	       LIMIT_DEVNAME, LIMIT_DEVNAME, "Parent name",
 	       "Parent uclass", "seq");
 
 	for (ret = uclass_first_device(UCLASS_PMIC, &dev); dev;
 	     ret = uclass_next_device(&dev)) {
-		printf("|%*d | %-*.*s| %-*.*s| %s @ %d\n",
+		if (ret)
-		       LIMIT_SEQ, dev->seq,
+			continue;
-		       LIMIT_DEVNAME, LIMIT_DEVNAME, dev->name,
+
-		       LIMIT_DEVNAME, LIMIT_DEVNAME, dev->parent->name,
+		printf("| %-*.*s| %-*.*s| %s @ %d\n",
+		       LIMIT_DEV, LIMIT_DEV, dev->name,
+		       LIMIT_PARENT, LIMIT_PARENT, dev->parent->name,
 		       dev_get_uclass_name(dev->parent), dev->parent->seq);
 	}
 
@@ -114,8 +81,10 @@ static int do_dump(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	uint reg;
 	int ret;
 
-	if (!currdev)
+	if (!currdev) {
-		return failed("get", "current", "device", -ENODEV);
+		printf("First, set the PMIC device!\n");
+		return CMD_RET_USAGE;
+	}
 
 	dev = currdev;
 
@@ -123,8 +92,10 @@ static int do_dump(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 
 	for (reg = 0; reg < pmic_reg_count(dev); reg++) {
 		ret = pmic_read(dev, reg, &value, 1);
-		if (ret)
+		if (ret) {
-			return failed("read", dev->name, "register", ret);
+			printf("Can't read register: %d\n", reg);
+			return failure(ret);
+		}
 
 		if (!(reg % 16))
 			printf("\n0x%02x: ", reg);
@@ -143,8 +114,10 @@ static int do_read(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	uint8_t value;
 	uint reg;
 
-	if (!currdev)
+	if (!currdev) {
-		return failed("get", "current", "device", -ENODEV);
+		printf("First, set the PMIC device!\n");
+		return CMD_RET_USAGE;
+	}
 
 	dev = currdev;
 
@@ -154,13 +127,15 @@ static int do_read(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	reg = simple_strtoul(argv[1], NULL, 0);
 	regs = pmic_reg_count(dev);
 	if (reg > regs) {
-		printf("Pmic max reg: %d\n", regs);
+		printf("PMIC max reg: %d\n", regs);
-		return failed("read", "given", "address", -EFAULT);
+		return failure(-EFAULT);
 	}
 
 	ret = pmic_read(dev, reg, &value, 1);
-	if (ret)
+	if (ret) {
-		return failed("read", dev->name, "register", ret);
+		printf("Can't read PMIC register: %d!\n", reg);
+		return failure(ret);
+	}
 
 	printf("0x%02x: 0x%2.2x\n", reg, value);
 
@@ -174,8 +149,10 @@ static int do_write(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	uint8_t value;
 	uint reg;
 
-	if (!currdev)
+	if (!currdev) {
-		return failed("get", "current", "device", -ENODEV);
+		printf("First, set the PMIC device!\n");
+		return CMD_RET_USAGE;
+	}
 
 	dev = currdev;
 
@@ -185,15 +162,17 @@ static int do_write(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	reg = simple_strtoul(argv[1], NULL, 0);
 	regs = pmic_reg_count(dev);
 	if (reg > regs) {
-		printf("Pmic max reg: %d\n", regs);
+		printf("PMIC max reg: %d\n", regs);
-		return failed("write", "given", "address", -EFAULT);
+		return failure(-EFAULT);
 	}
 
 	value = simple_strtoul(argv[2], NULL, 0);
 
 	ret = pmic_write(dev, reg, &value, 1);
-	if (ret)
+	if (ret) {
-		return failed("write", dev->name, "register", ret);
+		printf("Can't write PMIC register: %d!\n", reg);
+		return failure(ret);
+	}
 
 	return CMD_RET_SUCCESS;
 }
@@ -224,7 +203,7 @@ static int do_pmic(cmd_tbl_t *cmdtp, int flag, int argc,
 U_BOOT_CMD(pmic, CONFIG_SYS_MAXARGS, 1, do_pmic,
 	" operations",
 	"list          - list pmic devices\n"
-	"pmic dev [id]      - show or [set] operating pmic device\n"
+	"pmic dev [name]    - show or [set] operating PMIC device\n"
 	"pmic dump          - dump registers\n"
 	"pmic read address  - read byte of register at address\n"
 	"pmic write address - write byte to register at address\n"