[U-Boot] [PATCH v3 26/35] power: Add a regulator driver for the as3722 PMIC
Simon Glass
sjg at chromium.org
Mon Jun 12 12:21:53 UTC 2017
This pmic includes regulators which should have their own driver. Add
a driver to support these.
Signed-off-by: Simon Glass <sjg at chromium.org>
Reviewed-by: Lukasz Majewski <lukma at denx.de>
---
Changes in v3: None
Changes in v2: None
drivers/power/regulator/Kconfig | 9 ++
drivers/power/regulator/Makefile | 1 +
drivers/power/regulator/as3722_regulator.c | 149 +++++++++++++++++++++++++++++
include/power/as3722.h | 8 ++
4 files changed, 167 insertions(+)
create mode 100644 drivers/power/regulator/as3722_regulator.c
diff --git a/drivers/power/regulator/Kconfig b/drivers/power/regulator/Kconfig
index f2134874c2..c82a936e8a 100644
--- a/drivers/power/regulator/Kconfig
+++ b/drivers/power/regulator/Kconfig
@@ -34,6 +34,15 @@ config REGULATOR_ACT8846
by the PMIC device. This driver is controlled by a device tree node
which includes voltage limits.
+config REGULATOR_AS3722
+ bool "Enable driver for AS7322 regulator"
+ depends on DM_REGULATOR && PMIC_AS3722
+ help
+ Enable support for the regulator functions of the AS3722. The
+ driver implements enable/disable for step-down bucks and LDOs,
+ but does not yet support change voltages. Currently this must be
+ done using direct register writes to the PMIC.
+
config DM_REGULATOR_PFUZE100
bool "Enable Driver Model for REGULATOR PFUZE100"
depends on DM_REGULATOR && DM_PMIC_PFUZE100
diff --git a/drivers/power/regulator/Makefile b/drivers/power/regulator/Makefile
index ce14d08fd4..18fb870e43 100644
--- a/drivers/power/regulator/Makefile
+++ b/drivers/power/regulator/Makefile
@@ -7,6 +7,7 @@
obj-$(CONFIG_$(SPL_)DM_REGULATOR) += regulator-uclass.o
obj-$(CONFIG_REGULATOR_ACT8846) += act8846.o
+obj-$(CONFIG_REGULATOR_AS3722) += as3722_regulator.o
obj-$(CONFIG_DM_REGULATOR_MAX77686) += max77686.o
obj-$(CONFIG_DM_REGULATOR_PFUZE100) += pfuze100.o
obj-$(CONFIG_REGULATOR_PWM) += pwm_regulator.o
diff --git a/drivers/power/regulator/as3722_regulator.c b/drivers/power/regulator/as3722_regulator.c
new file mode 100644
index 0000000000..0122e1e389
--- /dev/null
+++ b/drivers/power/regulator/as3722_regulator.c
@@ -0,0 +1,149 @@
+/*
+ * Copyright (C) 2017 Google, Inc
+ * Written by Simon Glass <sjg at chromium.org>
+ *
+ * Placeholder regulator driver for as3722.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <power/as3722.h>
+#include <power/pmic.h>
+#include <power/regulator.h>
+
+static int stepdown_get_value(struct udevice *dev)
+{
+ return -ENOSYS;
+}
+
+static int stepdown_set_value(struct udevice *dev, int uvolt)
+{
+ return -ENOSYS;
+}
+
+static int stepdown_set_enable(struct udevice *dev, bool enable)
+{
+ struct udevice *pmic = dev_get_parent(dev);
+ int sd = dev->driver_data;
+ int ret;
+
+ ret = pmic_clrsetbits(pmic, AS3722_SD_CONTROL, 0, 1 << sd);
+ if (ret < 0) {
+ debug("%s: failed to write SD control register: %d", __func__,
+ ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static bool stepdown_get_enable(struct udevice *dev)
+{
+ struct udevice *pmic = dev_get_parent(dev);
+ int sd = dev->driver_data;
+ int ret;
+
+ ret = pmic_reg_read(pmic, AS3722_SD_CONTROL);
+ if (ret < 0) {
+ debug("%s: failed to read SD control register: %d", __func__,
+ ret);
+ return false;
+ }
+
+ return ret & (1 << sd) ? true : false;
+}
+
+static int ldo_get_value(struct udevice *dev)
+{
+ return -ENOSYS;
+}
+
+static int ldo_set_value(struct udevice *dev, int uvolt)
+{
+ return -ENOSYS;
+}
+
+static int ldo_set_enable(struct udevice *dev, bool enable)
+{
+ struct udevice *pmic = dev_get_parent(dev);
+ int ldo = dev->driver_data;
+ int ret;
+
+ ret = pmic_clrsetbits(pmic, AS3722_LDO_CONTROL, 0, 1 << ldo);
+ if (ret < 0) {
+ debug("%s: failed to write LDO control register: %d", __func__,
+ ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static bool ldo_get_enable(struct udevice *dev)
+{
+ struct udevice *pmic = dev_get_parent(dev);
+ int ldo = dev->driver_data;
+ int ret;
+
+ ret = pmic_reg_read(pmic, AS3722_LDO_CONTROL);
+ if (ret < 0) {
+ debug("%s: failed to read SD control register: %d", __func__,
+ ret);
+ return false;
+ }
+
+ return ret & (1 << ldo) ? true : false;
+}
+
+static int as3722_stepdown_probe(struct udevice *dev)
+{
+ struct dm_regulator_uclass_platdata *uc_pdata;
+
+ uc_pdata = dev_get_uclass_platdata(dev);
+
+ uc_pdata->type = REGULATOR_TYPE_BUCK;
+
+ return 0;
+}
+
+static int as3722_ldo_probe(struct udevice *dev)
+{
+ struct dm_regulator_uclass_platdata *uc_pdata;
+
+ uc_pdata = dev_get_uclass_platdata(dev);
+
+ uc_pdata->type = REGULATOR_TYPE_LDO;
+
+ return 0;
+}
+
+static const struct dm_regulator_ops as3722_stepdown_ops = {
+ .get_value = stepdown_get_value,
+ .set_value = stepdown_set_value,
+ .get_enable = stepdown_get_enable,
+ .set_enable = stepdown_set_enable,
+};
+
+static const struct dm_regulator_ops as3722_ldo_ops = {
+ .get_value = ldo_get_value,
+ .set_value = ldo_set_value,
+ .get_enable = ldo_get_enable,
+ .set_enable = ldo_set_enable,
+};
+
+U_BOOT_DRIVER(as3722_stepdown) = {
+ .name = "as3722_stepdown",
+ .id = UCLASS_REGULATOR,
+ .ops = &as3722_stepdown_ops,
+ .probe = as3722_stepdown_probe,
+};
+
+U_BOOT_DRIVER(as3722_ldo) = {
+ .name = "as3722_ldo",
+ .id = UCLASS_REGULATOR,
+ .ops = &as3722_ldo_ops,
+ .probe = as3722_ldo_probe,
+};
diff --git a/include/power/as3722.h b/include/power/as3722.h
index 0f22482ff7..14afa0c81a 100644
--- a/include/power/as3722.h
+++ b/include/power/as3722.h
@@ -12,6 +12,14 @@
#define AS3722_GPIO_OUTPUT_VDDH (1 << 0)
#define AS3722_GPIO_INVERT (1 << 1)
+#define AS3722_DEVICE_ID 0x0c
+#define AS3722_SD_VOLTAGE(n) (0x00 + (n))
+#define AS3722_LDO_VOLTAGE(n) (0x10 + (n))
+#define AS3722_SD_CONTROL 0x4d
+#define AS3722_LDO_CONTROL 0x4e
+#define AS3722_ASIC_ID1 0x90
+#define AS3722_ASIC_ID2 0x91
+
struct udevice;
int as3722_init(struct udevice **devp);
--
2.13.1.508.gb3defc5cc-goog
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