[PATCH 8/9] regulator: add driver for ncv6336 regulator

Fabien Parent
2024-12-18T23:37:35Z

From: Fabien Parent <fabien.parent@linaro.org>

This commit adds support for the Onsemi NCV6336 buck down converter.

Signed-off-by: Fabien Parent <fabien.parent@linaro.org>
---
drivers/regulator/Kconfig | 7 +
drivers/regulator/Makefile | 1 +
drivers/regulator/ncv6336_regulator.rs | 241 +++++++++++++++++++++++++++++++++
3 files changed, 249 insertions(+)

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 39297f7d8177193e51c99bc2b360c6d9936e62fe..7254a6e1d7539b147b7ba00ebcb6fd92eb6b2616 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -952,6 +952,13 @@ config REGULATOR_MTK_DVFSRC
of Mediatek. It allows for voting on regulator state
between multiple users.

+config REGULATOR_NCV6336
+ tristate "Onsemi NCV6336 regulator driver"
+ depends on RUST && OF && I2C=y
+ select REGMAP_I2C
+ help
+ Say y here to support the Onsemi NCV6336 buck converter.
+
config REGULATOR_PALMAS
tristate "TI Palmas PMIC Regulators"
depends on MFD_PALMAS
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 3d5a803dce8a0556ba9557fa069c6e37593b3c69..0309a78b820cc85883c0c129801ab713e08e4391 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -113,6 +113,7 @@ obj-$(CONFIG_REGULATOR_MT6370) += mt6370-regulator.o
obj-$(CONFIG_REGULATOR_MT6380) += mt6380-regulator.o
obj-$(CONFIG_REGULATOR_MT6397) += mt6397-regulator.o
obj-$(CONFIG_REGULATOR_MTK_DVFSRC) += mtk-dvfsrc-regulator.o
+obj-$(CONFIG_REGULATOR_NCV6336) += ncv6336_regulator.o
obj-$(CONFIG_REGULATOR_QCOM_LABIBB) += qcom-labibb-regulator.o
obj-$(CONFIG_REGULATOR_QCOM_PM8008) += qcom-pm8008-regulator.o
obj-$(CONFIG_REGULATOR_QCOM_REFGEN) += qcom-refgen-regulator.o
diff --git a/drivers/regulator/ncv6336_regulator.rs b/drivers/regulator/ncv6336_regulator.rs
new file mode 100644
index 0000000000000000000000000000000000000000..7efd7630792b68fb353ed1b1634980def9e326a1
--- /dev/null
+++ b/drivers/regulator/ncv6336_regulator.rs
@@ -0,0 +1,241 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Driver for the Onsemi Buck Converter NCV6336
+//!
+//! Datasheet: https://www.onsemi.com/pdf/datasheet/ncv6336bm-d.pdf
+
+use kernel::{
+ c_str, i2c, of,
+ prelude::*,
+ regmap::{self, BitFieldReadOps, BitFieldWriteOps, RawFieldWriteOps},
+ regulator::{
+ driver::{Config, Desc, Device, Driver, RegmapHelpers, Status, Type},
+ Mode,
+ },
+ sync::{new_mutex, Arc, Mutex},
+};
+use register::*;
+
+kernel::module_i2c_driver! {
+ type: Ncv6336,
+ name: "ncv6336",
+ author: "Fabien Parent <fabien.parent@linaro.org>",
+ license: "GPL",
+}
+
+kernel::i2c_device_table!(
+ I2C_ID_TABLE,
+ MODULE_I2C_ID_TABLE,
+ <Ncv6336 as i2c::Driver>::IdInfo,
+ [(i2c::DeviceId::new(c_str!("ncv6336")), ()),]
+);
+
+kernel::of_device_table!(
+ OF_ID_TABLE,
+ MODULE_OF_ID_TABLE,
+ <Ncv6336 as i2c::Driver>::IdInfo,
+ [(of::DeviceId::new(c_str!("onnn,ncv6336")), ()),]
+);
+
+regmap::define_regmap_field_descs!(FIELD_DESCS, {
+ (pid, 0x3, READ, { value => raw([7:0], ro) }),
+ (rid, 0x4, READ, { value => raw([7:0], ro) }),
+ (fid, 0x5, READ, { value => raw([7:0], ro) }),
+ (progvsel1, 0x10, RW, {
+ voutvsel1 => raw([6:0], rw),
+ envsel1 => bit(7, rw),
+ }),
+ (progvsel0, 0x11, RW, {
+ voutvsel0 => raw([6:0], rw),
+ envsel0 => bit(7, rw),
+ }),
+ (pgood, 0x12, RW, { dischg => bit(4, rw) }),
+ (command, 0x14, RW, {
+ vselgt => bit(0, rw),
+ pwmvsel1 => bit(6, rw),
+ pwmvsel0 => bit(7, rw),
+ }),
+ (limconf, 0x16, RW, {
+ rearm => bit(0, rw),
+ rststatus => bit(1, rw),
+ tpwth => enum([5:4], rw, {
+ Temp83C = 0x0,
+ Temp94C = 0x1,
+ Temp105C = 0x2,
+ Temp116C = 0x3,
+ }),
+ ipeak => enum([7:6], rw, {
+ Peak3p5A = 0x0,
+ Peak4p0A = 0x1,
+ Peak4p5A = 0x2,
+ Peak5p0A = 0x3,
+ }),
+ })
+});
+
+static NCV6336_DESC: Desc = Desc::new::<Ncv6336>(c_str!("ncv6336"), Type::Voltage)
+ .with_owner(&THIS_MODULE)
+ .with_of_match(c_str!("buck"))
+ .with_active_discharge(
+ pgood::addr(),
+ pgood::dischg::mask(),
+ pgood::dischg::mask(),
+ 0,
+ )
+ .with_csel(
+ limconf::addr(),
+ limconf::ipeak::mask(),
+ &[3_500_000, 4_000_000, 4_500_000, 5_000_000],
+ )
+ .with_enable(
+ progvsel0::addr(),
+ progvsel0::envsel0::mask(),
+ progvsel0::envsel0::mask(),
+ 0,
+ )
+ .with_linear_mapping(
+ progvsel0::addr(),
+ progvsel0::voutvsel0::mask(),
+ 600_000,
+ 6250,
+ 128,
+ 0,
+ );
+
+struct Ncv6336RegulatorData {
+ fields: regmap::Fields<{ FIELD_DESCS.len() }>,
+}
+
+struct Ncv6336(#[expect(dead_code)] Device<<Self as Driver>::Data>);
+
+impl i2c::Driver for Ncv6336 {
+ type IdInfo = ();
+
+ const I2C_ID_TABLE: Option<i2c::IdTable<Self::IdInfo>> = Some(&I2C_ID_TABLE);
+ const OF_ID_TABLE: Option<of::IdTable<Self::IdInfo>> = Some(&OF_ID_TABLE);
+
+ fn probe(client: &mut i2c::Client, _id_info: Option<&Self::IdInfo>) -> Result<Pin<KBox<Self>>> {
+ let config = regmap::Config::<AccessOps>::new(8, 8)
+ .with_max_register(0x16)
+ .with_cache_type(regmap::CacheType::RbTree);
+ let regmap = Arc::new(regmap::Regmap::init_i2c(client, &config)?, GFP_KERNEL)?;
+ let fields = regmap::Fields::new(&regmap, &FIELD_DESCS)?;
+
+ let data = Arc::pin_init(new_mutex!(Ncv6336RegulatorData { fields }), GFP_KERNEL)?;
+ let config = Config::new(client.as_ref(), data.clone()).with_regmap(regmap.clone());
+ let regulator = Device::register(client.as_ref(), &NCV6336_DESC, config)?;
+
+ let drvdata = KBox::new(Self(regulator), GFP_KERNEL)?;
+
+ Ok(drvdata.into())
+ }
+}
+
+#[vtable]
+impl Driver for Ncv6336 {
+ type Data = Arc<Mutex<Ncv6336RegulatorData>>;
+
+ fn list_voltage(reg: &mut Device<Self::Data>, selector: u32) -> Result<i32> {
+ reg.list_voltage_linear(selector)
+ }
+
+ fn enable(reg: &mut Device<Self::Data>) -> Result {
+ reg.enable_regmap()
+ }
+
+ fn disable(reg: &mut Device<Self::Data>) -> Result {
+ reg.disable_regmap()
+ }
+
+ fn is_enabled(reg: &mut Device<Self::Data>) -> Result<bool> {
+ reg.is_enabled_regmap()
+ }
+
+ fn set_active_discharge(reg: &mut Device<Self::Data>, enable: bool) -> Result {
+ reg.set_active_discharge_regmap(enable)
+ }
+
+ fn set_current_limit(reg: &mut Device<Self::Data>, min_ua: i32, max_ua: i32) -> Result {
+ reg.set_current_limit_regmap(min_ua, max_ua)
+ }
+
+ fn get_current_limit(reg: &mut Device<Self::Data>) -> Result<i32> {
+ reg.get_current_limit_regmap()
+ }
+
+ fn set_voltage_sel(reg: &mut Device<Self::Data>, selector: u32) -> Result {
+ reg.set_voltage_sel_regmap(selector)
+ }
+
+ fn get_voltage_sel(reg: &mut Device<Self::Data>) -> Result<i32> {
+ reg.get_voltage_sel_regmap()
+ }
+
+ fn set_mode(reg: &mut Device<Self::Data>, mode: Mode) -> Result {
+ let data = reg.data();
+ let fields = &mut data.lock().fields;
+
+ match mode {
+ Mode::Normal => command::pwmvsel0::clear(fields),
+ Mode::Fast => command::pwmvsel0::set(fields),
+ _ => Err(ENOTSUPP),
+ }
+ }
+
+ fn get_mode(reg: &mut Device<Self::Data>) -> Mode {
+ let data = reg.data();
+ let fields = &mut data.lock().fields;
+
+ match command::pwmvsel0::is_set(fields) {
+ Ok(true) => Mode::Fast,
+ Ok(false) => Mode::Normal,
+ Err(_) => Mode::Invalid,
+ }
+ }
+
+ fn get_status(reg: &mut Device<Self::Data>) -> Result<Status> {
+ if !Self::is_enabled(reg)? {
+ return Ok(Status::Off);
+ }
+
+ Ok(Self::get_mode(reg).into())
+ }
+
+ fn set_suspend_voltage(reg: &mut Device<Self::Data>, uv: i32) -> Result {
+ let data = reg.data();
+ let fields = &mut data.lock().fields;
+
+ let quot = (uv - 600000) / 6250;
+ let rem = (uv - 600000) % 6250;
+ let selector = if rem > 0 { quot + 1 } else { quot };
+
+ progvsel1::voutvsel1::write(fields, selector as _)
+ }
+
+ fn set_suspend_enable(reg: &mut Device<Self::Data>) -> Result {
+ let data = reg.data();
+ let fields = &mut data.lock().fields;
+
+ progvsel1::envsel1::set(fields)?;
+ command::vselgt::clear(fields)
+ }
+
+ fn set_suspend_disable(reg: &mut Device<Self::Data>) -> Result {
+ let data = reg.data();
+ let fields = &mut data.lock().fields;
+
+ progvsel1::envsel1::clear(fields)?;
+ command::vselgt::set(fields)
+ }
+
+ fn set_suspend_mode(reg: &mut Device<Self::Data>, mode: Mode) -> Result {
+ let data = reg.data();
+ let fields = &mut data.lock().fields;
+
+ match mode {
+ Mode::Normal => command::pwmvsel1::clear(fields),
+ Mode::Fast => command::pwmvsel1::set(fields),
+ _ => Err(ENOTSUPP),
+ }
+ }
+}

--
2.45.2