* [U-Boot] [PATCH v2 1/3] samsung: board: support eMMC reset using DT
@ 2015-01-15 2:45 Joonyoung Shim
2015-01-15 2:45 ` [U-Boot] [PATCH v2 2/3] Odroid: Add eMMC-reset node on DT Joonyoung Shim
2015-01-15 2:45 ` [U-Boot] [PATCH v2 3/3] Odroid-XU3: " Joonyoung Shim
0 siblings, 2 replies; 3+ messages in thread
From: Joonyoung Shim @ 2015-01-15 2:45 UTC (permalink / raw)
To: u-boot
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
diff --git a/board/samsung/common/board.c b/board/samsung/common/board.c
index 8b4c8e9..da2245f 100644
--- a/board/samsung/common/board.c
+++ b/board/samsung/common/board.c
@@ -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);
+ }
+}
diff --git a/board/samsung/odroid/odroid.c b/board/samsung/odroid/odroid.c
index b7d2381..b648832 100644
--- a/board/samsung/odroid/odroid.c
+++ b/board/samsung/odroid/odroid.c
@@ -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);
-}
diff --git a/doc/device-tree-bindings/exynos/emmc-reset.txt b/doc/device-tree-bindings/exynos/emmc-reset.txt
new file mode 100644
index 0000000..5e7ba26
--- /dev/null
+++ b/doc/device-tree-bindings/exynos/emmc-reset.txt
@@ -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>;
+};
--
1.9.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [U-Boot] [PATCH v2 2/3] Odroid: Add eMMC-reset node on DT
2015-01-15 2:45 [U-Boot] [PATCH v2 1/3] samsung: board: support eMMC reset using DT Joonyoung Shim
@ 2015-01-15 2:45 ` Joonyoung Shim
2015-01-15 2:45 ` [U-Boot] [PATCH v2 3/3] Odroid-XU3: " Joonyoung Shim
1 sibling, 0 replies; 3+ messages in thread
From: Joonyoung Shim @ 2015-01-15 2:45 UTC (permalink / raw)
To: u-boot
This needs for special handling of nRESET_OUT line(GPK1-2 gpio) for eMMC
memory to perform complete reboot on Odroid X2/U3 boards.
Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
---
arch/arm/dts/exynos4412-odroid.dts | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/arm/dts/exynos4412-odroid.dts b/arch/arm/dts/exynos4412-odroid.dts
index 29ad6ab..c12c599 100644
--- a/arch/arm/dts/exynos4412-odroid.dts
+++ b/arch/arm/dts/exynos4412-odroid.dts
@@ -78,4 +78,9 @@
reg = <0x125B0000 0x100>;
};
};
+
+ emmc-reset {
+ compatible = "samsung,emmc-reset";
+ reset-gpio = <&gpk1 2 0>;
+ };
};
--
1.9.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [U-Boot] [PATCH v2 3/3] Odroid-XU3: Add eMMC-reset node on DT
2015-01-15 2:45 [U-Boot] [PATCH v2 1/3] samsung: board: support eMMC reset using DT Joonyoung Shim
2015-01-15 2:45 ` [U-Boot] [PATCH v2 2/3] Odroid: Add eMMC-reset node on DT Joonyoung Shim
@ 2015-01-15 2:45 ` Joonyoung Shim
1 sibling, 0 replies; 3+ messages in thread
From: Joonyoung Shim @ 2015-01-15 2:45 UTC (permalink / raw)
To: u-boot
This needs for special handling of nRESET_OUT line(GPD1-0 gpio) for eMMC
memory to perform complete reboot on Odroid XU3 board.
Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
---
arch/arm/dts/exynos5422-odroidxu3.dts | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/arm/dts/exynos5422-odroidxu3.dts b/arch/arm/dts/exynos5422-odroidxu3.dts
index 8f46637..d0a8621 100644
--- a/arch/arm/dts/exynos5422-odroidxu3.dts
+++ b/arch/arm/dts/exynos5422-odroidxu3.dts
@@ -46,4 +46,9 @@
mmc at 12220000 {
fifoth_val = <0x201f0020>;
};
+
+ emmc-reset {
+ compatible = "samsung,emmc-reset";
+ reset-gpio = <&gpd1 0 0>;
+ };
};
--
1.9.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
end of thread, other threads:[~2015-01-15 2:45 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2015-01-15 2:45 [U-Boot] [PATCH v2 1/3] samsung: board: support eMMC reset using DT Joonyoung Shim
2015-01-15 2:45 ` [U-Boot] [PATCH v2 2/3] Odroid: Add eMMC-reset node on DT Joonyoung Shim
2015-01-15 2:45 ` [U-Boot] [PATCH v2 3/3] Odroid-XU3: " Joonyoung Shim
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