From: Baolin Wang <baolin.wang@linaro.org>
To: sre@kernel.org
Cc: broonie@kernel.org, baolin.wang@linaro.org,
linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org
Subject: [PATCH v3] power: reset: Add Spreadtrum SC27xx PMIC power off support
Date: Fri, 23 Feb 2018 11:32:38 +0800 [thread overview]
Message-ID: <b0c82288ac8594b501191dfc5b5b320c04079725.1519356443.git.baolin.wang@linaro.org> (raw)
On Spreadtrum platform, we need power off system through external SC27xx
series PMICs including the SC2720, SC2721, SC2723, SC2730 and SC2731 chips.
Thus this patch adds SC27xx series PMICs power-off support.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
---
Changes since v2:
- Change to build-in this driver.
Changes since v1:
- Add remove interface.
- Add regmap checking when probing the driver.
- Add MODULE_ALIAS()
---
drivers/power/reset/Kconfig | 9 +++++
drivers/power/reset/Makefile | 1 +
drivers/power/reset/sc27xx-poweroff.c | 64 +++++++++++++++++++++++++++++++++
3 files changed, 74 insertions(+)
create mode 100644 drivers/power/reset/sc27xx-poweroff.c
diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index ca0de1a..01543f5 100644
--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -227,5 +227,14 @@ config SYSCON_REBOOT_MODE
register, then the bootloader can read it to take different
action according to the mode.
+config POWER_RESET_SC27XX
+ bool "Spreadtrum SC27xx PMIC power-off driver"
+ depends on MFD_SC27XX_PMIC || COMPILE_TEST
+ help
+ This driver supports powering off a system through
+ Spreadtrum SC27xx series PMICs. The SC27xx series
+ PMICs includes the SC2720, SC2721, SC2723, SC2730
+ and SC2731 chips.
+
endif
diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
index aeb65ed..225d645 100644
--- a/drivers/power/reset/Makefile
+++ b/drivers/power/reset/Makefile
@@ -27,3 +27,4 @@ obj-$(CONFIG_POWER_RESET_RMOBILE) += rmobile-reset.o
obj-$(CONFIG_POWER_RESET_ZX) += zx-reboot.o
obj-$(CONFIG_REBOOT_MODE) += reboot-mode.o
obj-$(CONFIG_SYSCON_REBOOT_MODE) += syscon-reboot-mode.o
+obj-$(CONFIG_POWER_RESET_SC27XX) += sc27xx-poweroff.o
diff --git a/drivers/power/reset/sc27xx-poweroff.c b/drivers/power/reset/sc27xx-poweroff.c
new file mode 100644
index 0000000..e3925a9
--- /dev/null
+++ b/drivers/power/reset/sc27xx-poweroff.c
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 Spreadtrum Communications Inc.
+ * Copyright (C) 2018 Linaro Ltd.
+ */
+
+#include <linux/cpu.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/regmap.h>
+#include <linux/syscore_ops.h>
+
+#define SC27XX_PWR_PD_HW 0xc2c
+#define SC27XX_PWR_OFF_EN BIT(0)
+
+static struct regmap *regmap;
+
+/*
+ * On Spreadtrum platform, we need power off system through external SC27xx
+ * series PMICs, and it is one similar SPI bus mapped by regmap to access PMIC,
+ * which is not fast io access.
+ *
+ * So before stopping other cores, we need release other cores' resource by
+ * taking cpus down to avoid racing regmap or spi mutex lock when poweroff
+ * system through PMIC.
+ */
+void sc27xx_poweroff_shutdown(void)
+{
+ int cpu = smp_processor_id();
+
+ freeze_secondary_cpus(cpu);
+}
+
+static struct syscore_ops poweroff_syscore_ops = {
+ .shutdown = sc27xx_poweroff_shutdown,
+};
+
+static void sc27xx_poweroff_do_poweroff(void)
+{
+ regmap_write(regmap, SC27XX_PWR_PD_HW, SC27XX_PWR_OFF_EN);
+}
+
+static int sc27xx_poweroff_probe(struct platform_device *pdev)
+{
+ if (regmap)
+ return -EINVAL;
+
+ regmap = dev_get_regmap(pdev->dev.parent, NULL);
+ if (!regmap)
+ return -ENODEV;
+
+ pm_power_off = sc27xx_poweroff_do_poweroff;
+ register_syscore_ops(&poweroff_syscore_ops);
+ return 0;
+}
+
+static struct platform_driver sc27xx_poweroff_driver = {
+ .probe = sc27xx_poweroff_probe,
+ .driver = {
+ .name = "sc27xx-poweroff",
+ },
+};
+builtin_platform_driver(sc27xx_poweroff_driver);
--
1.7.9.5
next reply other threads:[~2018-02-23 3:33 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-23 3:32 Baolin Wang [this message]
2018-02-24 12:37 ` [PATCH v3] power: reset: Add Spreadtrum SC27xx PMIC power off support kbuild test robot
2018-02-24 13:06 ` kbuild test robot
2018-02-26 1:42 ` Baolin Wang
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