Hello,
On 2015-01-22 02:33, Joonyoung Shim wrote:
On 01/22/2015 10:06 AM, Sebastian Reichel wrote:
On Wed, Oct 29, 2014 at 02:13:28PM +0100, Marek Szyprowski wrote:
This patch adds a driver implementing correct reboot and poweroff
procedures for Exynos4412-based Hardkernel's Odroid X/X2/U2/U3/U3+
boards.
Sorry it took so long. I have a couple of small requests before
applying this (comments inline).
Signed-off-by: Marek Szyprowski <m.szyprow...@samsung.com>
---
.../bindings/power/reset/odroid-reset.txt | 18 ++++
drivers/power/reset/Kconfig | 6 ++
drivers/power/reset/Makefile | 1 +
drivers/power/reset/odroid-reboot.c | 119 +++++++++++++++++++++
4 files changed, 144 insertions(+)
create mode 100644
Documentation/devicetree/bindings/power/reset/odroid-reset.txt
create mode 100644 drivers/power/reset/odroid-reboot.c
diff --git a/Documentation/devicetree/bindings/power/reset/odroid-reset.txt
b/Documentation/devicetree/bindings/power/reset/odroid-reset.txt
new file mode 100644
index 000000000000..86471a463518
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/reset/odroid-reset.txt
@@ -0,0 +1,18 @@
+* Device tree bindings for Hardkernel's Exynos4412 based Odroid boards
+
+This node is intended to allow proper system reboot and power off of
+Odroid X/X2/U2/U3/U3+ boards with eMMC storage. Without this node, board
+hangs during standard reset procedure.
+
+Required properties:
+- compatible: hardkernel,odroid-reboot
+- samsung,pmureg-phandle: phandle to Exynos PMU node
+- reset-gpios: phandle and gpio-specifier to the GPIO pin
+ connected to the eMMC_nDET
+
+Example:
+odroid_reboot {
+ compatible = "hardkernel,odroid-reboot";
+ samsung,pmureg-phandle = <&pmu_system_controller>;
+ reset-gpio = <&gpk1 2 0>;
+};
diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index f65ff49bb275..f02b13d5344f 100644
--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -84,6 +84,12 @@ config POWER_RESET_LTC2952
This driver supports an external powerdown trigger and board power
down via the LTC2952. Bindings are made in the device tree.
+config POWER_RESET_ODROID
+ bool "Hardkernel's Exynos4412 based Odroid reboot driver"
+ depends on POWER_RESET && ARCH_EXYNOS
once the arm specific restart handler is gone you can add ||
COMPILE_TEST
+ help
+ Power off and restart support for Odroid boards.
+
config POWER_RESET_QNAP
bool "QNAP power-off driver"
depends on OF_GPIO && PLAT_ORION
diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
index 76ce1c59469b..178ee86eb813 100644
--- a/drivers/power/reset/Makefile
+++ b/drivers/power/reset/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_POWER_RESET_GPIO_RESTART) += gpio-restart.o
obj-$(CONFIG_POWER_RESET_HISI) += hisi-reboot.o
obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o
obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o
+obj-$(CONFIG_POWER_RESET_ODROID) += odroid-reboot.o
obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o
obj-$(CONFIG_POWER_RESET_RESTART) += restart-poweroff.o
obj-$(CONFIG_POWER_RESET_SUN6I) += sun6i-reboot.o
diff --git a/drivers/power/reset/odroid-reboot.c
b/drivers/power/reset/odroid-reboot.c
new file mode 100644
index 000000000000..823e93539220
--- /dev/null
+++ b/drivers/power/reset/odroid-reboot.c
@@ -0,0 +1,119 @@
+/*
+ * Copyright (c) 2014 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/io.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
+#include <linux/reboot.h>
+#include <linux/regmap.h>
+
+#include <asm/system_misc.h>
+
+#define PS_HOLD_CONTROL 0x330C
+
+struct odroid_reboot_data {
+ struct device *dev;
+ int power_gpio;
+ struct regmap *reg_pmu;
+ void (*reboot_func)(enum reboot_mode mode, const char *cmd);
+};
+
+static struct odroid_reboot_data *reboot_data;
+
+static void odroid_reboot(enum reboot_mode mode, const char *cmd)
+{
+ local_irq_disable();
+
+ gpio_set_value(reboot_data->power_gpio, 0);
+ mdelay(150);
+ gpio_set_value(reboot_data->power_gpio, 1);
+
+ reboot_data->reboot_func(mode, cmd);
+
It is called do_kernel_restart() if arm_pm_restart is NULL from
machine_restart of arch/arm/kernel/process.c
How about this?
if (reboot_data->reboot_func)
reboot_data->reboot_func(mode, cmd);
else
do_kernel_restart(cmd);
Frankly, I analyzed this case once again and I came to conclusion that there
is no need to make a separate reset driver for Odroid boards. There is
nothing
special, specific to whole board about this gpio. It is rather a property of
MMC host controller and eMMC card that is connected to it. When only gpio
toggling code is moved to reset handler registered from mmc controller, the
board properly performs reboot with a generic exynos4 code. The poweroff
code
in above driver is just a generic Exynos4 code, so again there is no need to
duplicate it.
By moving the code to mmc driver, the same approach can be used for other
Odroid boards (XU/XU3) and maybe even other boards which need manual
resetting
of eMMC cards to properly perform reboot procedure.
Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland
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