* [PATCH 1/4] dt-bindings: regulator: add support for the stm32-booster
2019-06-28 8:08 [PATCH 0/4] regulator: add support for the STM32 ADC booster Fabrice Gasnier
@ 2019-06-28 8:08 ` Fabrice Gasnier
2019-06-28 8:08 ` [PATCH 2/4] " Fabrice Gasnier
` (2 subsequent siblings)
3 siblings, 0 replies; 6+ messages in thread
From: Fabrice Gasnier @ 2019-06-28 8:08 UTC (permalink / raw)
To: broonie, lgirdwood, robh+dt, alexandre.torgue
Cc: mcoquelin.stm32, fabrice.gasnier, linux-arm-kernel, linux-kernel,
linux-stm32, devicetree
Document the 3.3V booster regulator embedded in stm32h7 and stm32mp1
devices, that can be used to supply ADC analog input switches.
It's controlled by using system configuration registers (SYSCFG).
Introduce two compatibles as the booster regulator is controlled by:
- a unique register/bit in STM32H7
- a set/clear register pair in STM32MP1
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
---
.../devicetree/bindings/regulator/st,stm32-booster.txt | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
create mode 100644 Documentation/devicetree/bindings/regulator/st,stm32-booster.txt
diff --git a/Documentation/devicetree/bindings/regulator/st,stm32-booster.txt b/Documentation/devicetree/bindings/regulator/st,stm32-booster.txt
new file mode 100644
index 0000000..479ad4c
--- /dev/null
+++ b/Documentation/devicetree/bindings/regulator/st,stm32-booster.txt
@@ -0,0 +1,18 @@
+STM32 BOOSTER - Booster for ADC analog input switches
+
+Some STM32 devices embed a 3.3V booster supplied by Vdda, that can be used
+to supply ADC analog input switches.
+
+Required properties:
+- compatible: Should be one of:
+ "st,stm32h7-booster"
+ "st,stm32mp1-booster"
+- st,syscfg: Phandle to system configuration controller.
+- vdda-supply: Phandle to the vdda input analog voltage.
+
+Example:
+ booster: regulator-booster {
+ compatible = "st,stm32mp1-booster";
+ st,syscfg = <&syscfg>;
+ vdda-supply = <&vdda>;
+ };
--
2.7.4
^ permalink raw reply [flat|nested] 6+ messages in thread* [PATCH 2/4] regulator: add support for the stm32-booster
2019-06-28 8:08 [PATCH 0/4] regulator: add support for the STM32 ADC booster Fabrice Gasnier
2019-06-28 8:08 ` [PATCH 1/4] dt-bindings: regulator: add support for the stm32-booster Fabrice Gasnier
@ 2019-06-28 8:08 ` Fabrice Gasnier
2019-06-28 14:32 ` Mark Brown
2019-06-28 8:08 ` [PATCH 3/4] ARM: multi_v7_defconfig: enable STM32 booster regulator Fabrice Gasnier
2019-06-28 8:08 ` [PATCH 4/4] ARM: dts: stm32: add booster for ADC analog switches on stm32mp157c Fabrice Gasnier
3 siblings, 1 reply; 6+ messages in thread
From: Fabrice Gasnier @ 2019-06-28 8:08 UTC (permalink / raw)
To: broonie, lgirdwood, robh+dt, alexandre.torgue
Cc: mcoquelin.stm32, fabrice.gasnier, linux-arm-kernel, linux-kernel,
linux-stm32, devicetree
Add support for the 3.3V booster regulator embedded in stm32h7 and stm32mp1
devices, that can be used to supply ADC analog input switches.
This regulator is supplied by vdda. It's controlled by using SYSCFG:
- STM32H7 has a unique register to set/clear the booster enable bit
- STM32MP1 has separate set and clear registers to configure it.
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
---
drivers/regulator/Kconfig | 11 ++++
drivers/regulator/Makefile | 1 +
drivers/regulator/stm32-booster.c | 132 ++++++++++++++++++++++++++++++++++++++
3 files changed, 144 insertions(+)
create mode 100644 drivers/regulator/stm32-booster.c
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 6c37f0d..b34f45d 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -828,6 +828,17 @@ config REGULATOR_SKY81452
This driver can also be built as a module. If so, the module
will be called sky81452-regulator.
+config REGULATOR_STM32_BOOSTER
+ tristate "STMicroelectronics STM32 BOOSTER"
+ depends on ARCH_STM32 || COMPILE_TEST
+ help
+ This driver supports internal booster (3V3) embedded in some
+ STMicroelectronics STM32 chips. It can be used to supply ADC analog
+ input switches when vdda supply is below 2.7V.
+
+ This driver can also be built as a module. If so, the module
+ will be called stm32-booster.
+
config REGULATOR_STM32_VREFBUF
tristate "STMicroelectronics STM32 VREFBUF"
depends on ARCH_STM32 || COMPILE_TEST
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 93f5384..34a7b47 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -104,6 +104,7 @@ obj-$(CONFIG_REGULATOR_S2MPS11) += s2mps11.o
obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o
obj-$(CONFIG_REGULATOR_SC2731) += sc2731-regulator.o
obj-$(CONFIG_REGULATOR_SKY81452) += sky81452-regulator.o
+obj-$(CONFIG_REGULATOR_STM32_BOOSTER) += stm32-booster.o
obj-$(CONFIG_REGULATOR_STM32_VREFBUF) += stm32-vrefbuf.o
obj-$(CONFIG_REGULATOR_STM32_PWR) += stm32-pwr.o
obj-$(CONFIG_REGULATOR_STPMIC1) += stpmic1_regulator.o
diff --git a/drivers/regulator/stm32-booster.c b/drivers/regulator/stm32-booster.c
new file mode 100644
index 0000000..2a89766
--- /dev/null
+++ b/drivers/regulator/stm32-booster.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) STMicroelectronics 2019
+// Author(s): Fabrice Gasnier <fabrice.gasnier@st.com>.
+
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/of_regulator.h>
+
+/* STM32H7 SYSCFG register */
+#define STM32H7_SYSCFG_PMCR 0x04
+#define STM32H7_SYSCFG_BOOSTE_MASK BIT(8)
+
+/* STM32MP1 SYSCFG has set and clear registers */
+#define STM32MP1_SYSCFG_PMCSETR 0x04
+#define STM32MP1_SYSCFG_PMCCLRR 0x44
+#define STM32MP1_SYSCFG_EN_BOOSTER_MASK BIT(8)
+
+static const struct regulator_ops stm32h7_booster_ops = {
+ .list_voltage = regulator_list_voltage_linear,
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .is_enabled = regulator_is_enabled_regmap,
+};
+
+static const struct regulator_desc stm32h7_booster_desc = {
+ .name = "booster",
+ .supply_name = "vdda",
+ .n_voltages = 1,
+ .type = REGULATOR_VOLTAGE,
+ .min_uV = 3300000,
+ .fixed_uV = 3300000,
+ .ramp_delay = 66000, /* up to 50us to stabilize */
+ .ops = &stm32h7_booster_ops,
+ .enable_reg = STM32H7_SYSCFG_PMCR,
+ .enable_mask = STM32H7_SYSCFG_BOOSTE_MASK,
+ .owner = THIS_MODULE,
+};
+
+static int stm32mp1_booster_enable(struct regulator_dev *rdev)
+{
+ return regmap_write(rdev->regmap, STM32MP1_SYSCFG_PMCSETR,
+ STM32MP1_SYSCFG_EN_BOOSTER_MASK);
+}
+
+static int stm32mp1_booster_disable(struct regulator_dev *rdev)
+{
+ return regmap_write(rdev->regmap, STM32MP1_SYSCFG_PMCCLRR,
+ STM32MP1_SYSCFG_EN_BOOSTER_MASK);
+}
+
+static const struct regulator_ops stm32mp1_booster_ops = {
+ .list_voltage = regulator_list_voltage_linear,
+ .enable = stm32mp1_booster_enable,
+ .disable = stm32mp1_booster_disable,
+ .is_enabled = regulator_is_enabled_regmap,
+};
+
+static const struct regulator_desc stm32mp1_booster_desc = {
+ .name = "booster",
+ .supply_name = "vdda",
+ .n_voltages = 1,
+ .type = REGULATOR_VOLTAGE,
+ .min_uV = 3300000,
+ .fixed_uV = 3300000,
+ .ramp_delay = 66000,
+ .ops = &stm32mp1_booster_ops,
+ .enable_reg = STM32MP1_SYSCFG_PMCSETR,
+ .enable_mask = STM32MP1_SYSCFG_EN_BOOSTER_MASK,
+ .owner = THIS_MODULE,
+};
+
+static int stm32_booster_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = pdev->dev.of_node;
+ struct regulator_config config = { };
+ const struct regulator_desc *desc;
+ struct regulator_dev *rdev;
+ struct regmap *regmap;
+ int ret;
+
+ regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ desc = (const struct regulator_desc *)
+ of_match_device(dev->driver->of_match_table, dev)->data;
+
+ config.regmap = regmap;
+ config.dev = dev;
+ config.of_node = np;
+ config.init_data = of_get_regulator_init_data(dev, np, desc);
+
+ rdev = devm_regulator_register(dev, desc, &config);
+ if (IS_ERR(rdev)) {
+ ret = PTR_ERR(rdev);
+ dev_err(dev, "register failed with error %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct of_device_id stm32_booster_of_match[] = {
+ {
+ .compatible = "st,stm32h7-booster",
+ .data = (void *)&stm32h7_booster_desc
+ }, {
+ .compatible = "st,stm32mp1-booster",
+ .data = (void *)&stm32mp1_booster_desc
+ }, {
+ },
+};
+MODULE_DEVICE_TABLE(of, stm32_booster_of_match);
+
+static struct platform_driver stm32_booster_driver = {
+ .probe = stm32_booster_probe,
+ .driver = {
+ .name = "stm32-booster",
+ .of_match_table = of_match_ptr(stm32_booster_of_match),
+ },
+};
+module_platform_driver(stm32_booster_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Fabrice Gasnier <fabrice.gasnier@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics STM32 booster regulator driver");
+MODULE_ALIAS("platform:stm32-booster");
--
2.7.4
^ permalink raw reply [flat|nested] 6+ messages in thread