dm: gpio: Add live tree support

Add support for requesting GPIOs with a live device tree.

This involves adjusting the function signature for the legacy function
gpio_request_by_name_nodev(), so fix up all callers.

Signed-off-by: Simon Glass <sjg@chromium.org>
Fixes to stm32f746-disco.c:
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/board/samsung/common/board.c b/board/samsung/common/board.c
index 1762696..88299f1 100644
--- a/board/samsung/common/board.c
+++ b/board/samsung/common/board.c
@@ -351,8 +351,8 @@
 	if (node < 0)
 		return;
 
-	gpio_request_by_name_nodev(gd->fdt_blob, node, "reset-gpio", 0, &gpio,
-				   GPIOD_IS_OUT);
+	gpio_request_by_name_nodev(offset_to_ofnode(node), "reset-gpio", 0,
+				   &gpio, GPIOD_IS_OUT);
 
 	if (dm_gpio_is_valid(&gpio)) {
 		/*
diff --git a/board/samsung/common/exynos5-dt.c b/board/samsung/common/exynos5-dt.c
index aec1f39..44f412d 100644
--- a/board/samsung/common/exynos5-dt.c
+++ b/board/samsung/common/exynos5-dt.c
@@ -45,7 +45,7 @@
 	if (node <= 0)
 		return;
 
-	ret = gpio_request_by_name_nodev(gd->fdt_blob, node,
+	ret = gpio_request_by_name_nodev(offset_to_ofnode(node),
 					 "codec-enable-gpio", 0, &en_gpio,
 					 GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE);
 	if (ret == -FDT_ERR_NOTFOUND)