[PATCH v5 2/6] power: reset: qcom-pon: Add Qcom PON driver

Vinod Koul
2018-06-28T15:08:46Z

Add support Qualcomm PM8xxx PON which is responsible for reboot
mode support.

Co-developed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
---
drivers/power/reset/Kconfig | 11 +++++
drivers/power/reset/Makefile | 1 +
drivers/power/reset/qcom-pon.c | 91 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 103 insertions(+)
create mode 100644 drivers/power/reset/qcom-pon.c

diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
index df58fc878b3e..6533aa560aa1 100644
--- a/drivers/power/reset/Kconfig
+++ b/drivers/power/reset/Kconfig
@@ -104,6 +104,17 @@ config POWER_RESET_MSM
help
Power off and restart support for Qualcomm boards.

+config POWER_RESET_QCOM_PON
+ tristate "Qualcomm power-on driver"
+ depends on ARCH_QCOM
+ depends on MFD_SPMI_PMIC
+ select REBOOT_MODE
+ help
+ Power On support for Qualcomm boards.
+ If you have a Qualcomm platform and need support for
+ power-on and reboot reason, Say Y.
+ If unsure, Say N.
+
config POWER_RESET_OCELOT_RESET
bool "Microsemi Ocelot reset driver"
depends on MSCC_OCELOT || COMPILE_TEST
diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
index 7778c7485cf1..0aebee954ac1 100644
--- a/drivers/power/reset/Makefile
+++ b/drivers/power/reset/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o
obj-$(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-$(CONFIG_POWER_RESET_QCOM_PON) += qcom-pon.o
obj-$(CONFIG_POWER_RESET_OCELOT_RESET) += ocelot-reset.o
obj-$(CONFIG_POWER_RESET_PIIX4_POWEROFF) += piix4-poweroff.o
obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o
diff --git a/drivers/power/reset/qcom-pon.c b/drivers/power/reset/qcom-pon.c
new file mode 100644
index 000000000000..0c4caaa7e88f
--- /dev/null
+++ b/drivers/power/reset/qcom-pon.c
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2017-18 Linaro Limited
+
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <linux/reboot-mode.h>
+#include <linux/regmap.h>
+
+#define PON_SOFT_RB_SPARE 0x8f
+
+struct pm8916_pon {
+ struct device *dev;
+ struct regmap *regmap;
+ u32 baseaddr;
+ struct reboot_mode_driver reboot_mode;
+};
+
+static int pm8916_reboot_mode_write(struct reboot_mode_driver *reboot,
+ unsigned int magic)
+{
+ struct pm8916_pon *pon = container_of
+ (reboot, struct pm8916_pon, reboot_mode);
+ int ret;
+
+ ret = regmap_update_bits(pon->regmap,
+ pon->baseaddr + PON_SOFT_RB_SPARE,
+ 0xfc, magic << 2);
+ if (ret < 0)
+ dev_err(pon->dev, "update reboot mode bits failed\n");
+
+ return ret;
+}
+
+static int pm8916_pon_probe(struct platform_device *pdev)
+{
+ struct pm8916_pon *pon;
+ int error;
+
+ pon = devm_kzalloc(&pdev->dev, sizeof(*pon), GFP_KERNEL);
+ if (!pon)
+ return -ENOMEM;
+
+ pon->dev = &pdev->dev;
+
+ pon->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+ if (!pon->regmap) {
+ dev_err(&pdev->dev, "failed to locate regmap\n");
+ return -ENODEV;
+ }
+
+ error = of_property_read_u32(pdev->dev.of_node, "reg",
+ &pon->baseaddr);
+ if (error)
+ return error;
+
+ pon->reboot_mode.dev = &pdev->dev;
+ pon->reboot_mode.write = pm8916_reboot_mode_write;
+ error = devm_reboot_mode_register(&pdev->dev, &pon->reboot_mode);
+ if (error) {
+ dev_err(&pdev->dev, "can't register reboot mode\n");
+ return error;
+ }
+
+ platform_set_drvdata(pdev, pon);
+
+ return devm_of_platform_populate(&pdev->dev);
+}
+
+static const struct of_device_id pm8916_pon_id_table[] = {
+ { .compatible = "qcom,pm8916-pon" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, pm8916_pon_id_table);
+
+static struct platform_driver pm8916_pon_driver = {
+ .probe = pm8916_pon_probe,
+ .driver = {
+ .name = "pm8916-pon",
+ .of_match_table = of_match_ptr(pm8916_pon_id_table),
+ },
+};
+module_platform_driver(pm8916_pon_driver);
+
+MODULE_DESCRIPTION("pm8916 Power On driver");
+MODULE_LICENSE("GPL v2");
--
2.14.4