@@ -355,3 +355,31 @@ int misc_init_r(void)
return 0;
}
#endif
+
+void reset_misc(void)
+{
+ struct gpio_desc gpio = {};
+ int node;
+
+ node = fdt_node_offset_by_compatible(gd->fdt_blob, 0,
+ "samsung,emmc-reset");
+ if (node < 0)
+ return;
+
+ gpio_request_by_name_nodev(gd->fdt_blob, node, "reset-gpio", 0, &gpio,
+ GPIOD_IS_OUT);
+
+ if (dm_gpio_is_valid(&gpio)) {
+ /*
+ * Reset eMMC
+ *
+ * FIXME: Need to optimize delay time. Minimum 1usec pulse is
+ * required by 'JEDEC Standard No.84-A441' (eMMC)
+ * document but real delay time is expected to greater
+ * than 1usec.
+ */
+ dm_gpio_set_value(&gpio, 0);
+ mdelay(10);
+ dm_gpio_set_value(&gpio, 1);
+ }
+}
@@ -515,11 +515,3 @@ int board_usb_init(int index, enum usb_init_type init)
return s3c_udc_probe(&s5pc210_otg_data);
}
#endif
-
-void reset_misc(void)
-{
- /* Reset eMMC*/
- gpio_set_value(EXYNOS4X12_GPIO_K12, 0);
- mdelay(10);
- gpio_set_value(EXYNOS4X12_GPIO_K12, 1);
-}
new file mode 100644
@@ -0,0 +1,15 @@
+* Samsung eMMC reset
+
+Some exynos boards require special handling of nRESET_OUT line for eMMC memory
+to perform complete reboot.
+
+Required properties:
+- compatible: should be "samsung,emmc-reset"
+- reset-gpio: gpio chip for eMMC reset.
+
+Example:
+
+emmc-reset {
+ compatible = "samsung,emmc-reset";
+ reset-gpio = <&gpk1 2 0>;
+};
Some exynos boards require special handling of nRESET_OUT line for eMMC memory to perform complete reboot e.g. Odroid X2/U3/XU3 boards. This will support eMMC reset using DT from reset_misc of samsung common board file. Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com> --- board/samsung/common/board.c | 28 ++++++++++++++++++++++++++ board/samsung/odroid/odroid.c | 8 -------- doc/device-tree-bindings/exynos/emmc-reset.txt | 15 ++++++++++++++ 3 files changed, 43 insertions(+), 8 deletions(-) create mode 100644 doc/device-tree-bindings/exynos/emmc-reset.txt