From: Ban Feng <baneric926@gmail.com>
To: Guenter Roeck <linux@roeck-us.net>
Cc: jdelvare@suse.com, robh+dt@kernel.org,
krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org,
corbet@lwn.net, linux-hwmon@vger.kernel.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-doc@vger.kernel.org, openbmc@lists.ozlabs.org,
kwliu@nuvoton.com, kcfeng0@nuvoton.com,
DELPHINE_CHIU@wiwynn.com, Bonnie_Lo@wiwynn.com,
naresh.solanki@9elements.com, billy_tsai@aspeedtech.com
Subject: Re: [PATCH v3 3/3] hwmon: Driver for Nuvoton NCT7363Y
Date: Wed, 21 Feb 2024 09:26:34 +0800 [thread overview]
Message-ID: <CALz278bNWxgVZz7mjtsiQz+aU837+eNsebbJM6M07S0_CQgx4Q@mail.gmail.com> (raw)
In-Reply-To: <4ba56d33-cc58-44e1-9f2e-9fa7865e4537@roeck-us.net>
Hi Guenter,
On Sat, Feb 3, 2024 at 11:06 PM Guenter Roeck <linux@roeck-us.net> wrote:
>
> On Fri, Dec 22, 2023 at 09:33:52AM +0800, baneric926@gmail.com wrote:
> > From: Ban Feng <kcfeng0@nuvoton.com>
> >
> > NCT7363Y is an I2C based hardware monitoring chip from Nuvoton.
> >
> > Signed-off-by: Ban Feng <kcfeng0@nuvoton.com>
>
> Sorry for the late reply. I was waiting for the fan schema to be accepted,
> but it looks like that may take more time.
>
> Please fix the various issues reported by checkpatch --strict.
> Additional comments inline.
ok, fix in v4
>
> > ---
> > Documentation/hwmon/index.rst | 1 +
> > Documentation/hwmon/nct7363.rst | 33 ++
> > MAINTAINERS | 2 +
> > drivers/hwmon/Kconfig | 11 +
> > drivers/hwmon/Makefile | 1 +
> > drivers/hwmon/nct7363.c | 515 ++++++++++++++++++++++++++++++++
> > 6 files changed, 563 insertions(+)
> > create mode 100644 Documentation/hwmon/nct7363.rst
> > create mode 100644 drivers/hwmon/nct7363.c
> >
> > diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
> > index 72f4e6065bae..178d3cae95de 100644
> > --- a/Documentation/hwmon/index.rst
> > +++ b/Documentation/hwmon/index.rst
> > @@ -161,6 +161,7 @@ Hardware Monitoring Kernel Drivers
> > mp5023
> > nct6683
> > nct6775
> > + nct7363
> > nct7802
> > nct7904
> > npcm750-pwm-fan
> > diff --git a/Documentation/hwmon/nct7363.rst b/Documentation/hwmon/nct7363.rst
> > new file mode 100644
> > index 000000000000..89699c95aa4b
> > --- /dev/null
> > +++ b/Documentation/hwmon/nct7363.rst
> > @@ -0,0 +1,33 @@
> > +.. SPDX-License-Identifier: GPL-2.0
> > +
> > +Kernel driver nct7363
> > +=====================
> > +
> > +Supported chip:
> > +
> > + * Nuvoton NCT7363Y
> > +
> > + Prefix: nct7363
> > +
> > + Addresses: I2C 0x20, 0x21, 0x22, 0x23
> > +
> > +Author: Ban Feng <kcfeng0@nuvoton.com>
> > +
> > +
> > +Description
> > +-----------
> > +
> > +The NCT7363Y is a Fan controller which provides up to 16 independent
> > +FAN input monitors, and up to 16 independent PWM output with SMBus interface.
> > +
> > +
> > +Sysfs entries
> > +-------------
> > +
> > +Currently, the driver supports the following features:
> > +
> > +======================= =======================================================
> > +fanX_input provide current fan rotation value in RPM
> > +
> > +pwmX get or set PWM fan control value.
> > +======================= =======================================================
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index 53cfcc629aa1..e39c4fc01a3b 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -14842,6 +14842,8 @@ M: Ban Feng <kcfeng0@nuvoton.com>
> > L: linux-hwmon@vger.kernel.org
> > S: Maintained
> > F: Documentation/devicetree/bindings/hwmon/nuvoton,nct7363.yaml
> > +F: Documentation/hwmon/nct7363.rst
> > +F: drivers/hwmon/nct7363.c
> >
> > NETDEVSIM
> > M: Jakub Kicinski <kuba@kernel.org>
> > diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> > index cf27523eed5a..a0229851fc64 100644
> > --- a/drivers/hwmon/Kconfig
> > +++ b/drivers/hwmon/Kconfig
> > @@ -1605,6 +1605,17 @@ config SENSORS_NCT6775_I2C
> > This driver can also be built as a module. If so, the module
> > will be called nct6775-i2c.
> >
> > +config SENSORS_NCT7363
> > + tristate "Nuvoton NCT7363Y"
> > + depends on I2C
> > + select REGMAP_I2C
> > + help
> > + If you say yes here you get support for the Nuvoton NCT7363Y,
> > + hardware monitoring chip.
> > +
> > + This driver can also be built as a module. If so, the module
> > + will be called nct7363.
> > +
> > config SENSORS_NCT7802
> > tristate "Nuvoton NCT7802Y"
> > depends on I2C
> > diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> > index e84bd9685b5c..dd794aa06209 100644
> > --- a/drivers/hwmon/Makefile
> > +++ b/drivers/hwmon/Makefile
> > @@ -166,6 +166,7 @@ obj-$(CONFIG_SENSORS_NCT6775_CORE) += nct6775-core.o
> > nct6775-objs := nct6775-platform.o
> > obj-$(CONFIG_SENSORS_NCT6775) += nct6775.o
> > obj-$(CONFIG_SENSORS_NCT6775_I2C) += nct6775-i2c.o
> > +obj-$(CONFIG_SENSORS_NCT7363) += nct7363.o
> > obj-$(CONFIG_SENSORS_NCT7802) += nct7802.o
> > obj-$(CONFIG_SENSORS_NCT7904) += nct7904.o
> > obj-$(CONFIG_SENSORS_NPCM7XX) += npcm750-pwm-fan.o
> > diff --git a/drivers/hwmon/nct7363.c b/drivers/hwmon/nct7363.c
> > new file mode 100644
> > index 000000000000..1bf6e83afd7f
> > --- /dev/null
> > +++ b/drivers/hwmon/nct7363.c
> > @@ -0,0 +1,515 @@
> > +// SPDX-License-Identifier: GPL-2.0-or-later
> > +/*
> > + * Copyright (c) 2023 Nuvoton Technology corporation.
> > + */
> > +
> > +#include <linux/bitfield.h>
> > +#include <linux/bits.h>
> > +#include <linux/err.h>
> > +#include <linux/hwmon.h>
> > +#include <linux/hwmon-sysfs.h>
> > +#include <linux/i2c.h>
> > +#include <linux/jiffies.h>
> > +#include <linux/module.h>
> > +#include <linux/mutex.h>
> > +#include <linux/regmap.h>
> > +#include <linux/slab.h>
> > +
> > +#define NCT7363_REG_GPIO_0_3 0x20
> > +#define NCT7363_REG_GPIO_4_7 0x21
> > +#define NCT7363_REG_GPIO_10_13 0x22
> > +#define NCT7363_REG_GPIO_14_17 0x23
> > +#define NCT7363_REG_PWMEN_0_7 0x38
> > +#define NCT7363_REG_PWMEN_8_15 0x39
> > +#define NCT7363_REG_FANINEN_0_7 0x41
> > +#define NCT7363_REG_FANINEN_8_15 0x42
> > +#define NCT7363_REG_FANINx_HVAL(x) (0x48 + ((x) * 2))
> > +#define NCT7363_REG_FANINx_LVAL(x) (0x49 + ((x) * 2))
> > +#define NCT7363_REG_FSCPxDUTY(x) (0x90 + ((x) * 2))
> > +#define NCT7363_REG_VENDOR_ID 0xFD
> > +#define NCT7363_REG_CHIP_ID 0xFE
> > +#define NCT7363_REG_DEVICE_ID 0xFF
> > +
> > +#define NUVOTON_ID 0x49
> > +#define CHIP_ID 0x19
> > +#define DEVICE_ID 0x88
> > +
> > +#define PWM_SEL(x) (BIT(0) << ((x % 4) * 2))
> > +#define FANIN_SEL(x) (BIT(1) << ((x % 4) * 2))
>
> (x). checkpatch -strict does report this.
ok, fix in v4
>
> > +#define BIT_CHECK(x) (BIT(0) << x)
>
> This is identical to BIT(x) so I really don't get the point.
ok, fix in v4
>
> > +
> > +#define NCT7363_FANINx_LVAL_MASK GENMASK(4, 0)
>
> No CamelCase defines or variables, please.
ok, fix in v4
>
> > +#define NCT7363_FANIN_MASK GENMASK(12, 0)
> > +
> > +#define NCT7363_PWM_COUNT 16
> > +#define NCT7363_FANIN_COUNT 16
> > +
> > +#define REFRESH_INTERVAL (2 * HZ)
> > +
> > +static inline unsigned long FAN_FROM_REG(u16 val)
> > +{
> > + if ((val >= NCT7363_FANIN_MASK) || (val == 0))
>
> Unnecessary () as reported by checkpatch.
ok, fix in v4
>
> Too bad the datasheet isn't public. It would be useful to know what
> it means if the upper bits are set. Unconditionally reporting a fan
> speed of 0 if any of the bits are set seems excessive unless there
> is a good reason for it. If those bits indicate fan faults,
> it might make sense to implement respective attributes.
>
> [ Why do you keep this chip and NCT7362Y so secretive ? ]
It's only a double check for the bit range from 0 to 12.
I'll consider if this is still needed after dropping the local caching.
>
> > + return 0;
> > +
> > + return (1350000UL / val);
> > +}
> > +
> > +static const unsigned short normal_i2c[] = {
> > + 0x20, 0x21, 0x22, 0x23, I2C_CLIENT_END
> > +};
> > +
> > +enum chips { nct7363 };
>
> Unnecessary. If there are plans for this driver to support more chips
> in the future, the enum can be added at that time. Yes, I can see in
> Nuvoton's 2024 product selection document that there is a NCT7362Y
> with the same number of fan and pwm channels, but that doesn't help
> if the chips are kept under wrap.
so far only focus on NCT7363Y, I'll fix in v4
>
> Searching for the chips on the internet, I am reminded of
> https://lore.kernel.org/lkml/20230607101827.8544-4-zev@bewilderbeest.net/T/
> which introduces a quite similar driver with more functionality for NCT7362Y.
> That submission even mentions a NCT7360 with 8 channels. Quite frankly
> I am inclined to reject both drivers (not that I ever got an update for
> the NCT7362Y driver, but anyway) until I get a better understanding
> of the similarities and differences between NCT7362Y and NCT7363Y.
> Please consider sending me datasheets for those chips.
Sure, I'll send the relevant datasheet to you.
>
> > +
> > +static const struct i2c_device_id nct7363_id[] = {
> > + { "nct7363", nct7363 },
> > + { }
> > +};
> > +MODULE_DEVICE_TABLE(i2c, nct7363_id);
> > +
> > +static const struct of_device_id nct7363_of_match[] = {
> > + { .compatible = "nuvoton,nct7363", .data = (void *)nct7363 },
> > + { },
> > +};
> > +MODULE_DEVICE_TABLE(of, nct7363_of_match);
> > +
> > +struct nct7363_data {
> > + struct regmap *regmap;
> > + struct mutex update_lock;
> > + bool valid;
> > + unsigned long last_updated; /* In jiffies */
> > +
> > + u16 fanin_mask;
> > + u16 fan[NCT7363_FANIN_COUNT];
> > + u16 pwm_mask;
> > + u8 pwm[NCT7363_PWM_COUNT];
> > +};
> > +
> > +static struct nct7363_data *nct7363_update_device(struct device *dev)
>
> Personally I recommend to drop all local caching and just read values
> through regmap as requested.
ok, fix in v4
>
> > +{
> > + struct nct7363_data *data = dev_get_drvdata(dev);
> > + unsigned int hi, lo, regval;
> > + int i, ret = 0;
> > +
> > + mutex_lock(&data->update_lock);
> > +
> > + if (!(time_after(jiffies, data->last_updated + REFRESH_INTERVAL)
> > + || !data->valid))
> > + goto no_sensor_update;
> > +
> > + for (i = 0; i < ARRAY_SIZE(data->fan); i++) {
> > + if (!(data->fanin_mask & BIT_CHECK(i)))
> > + continue;
> > +
> > + /*
> > + * High-byte register should be read first to latch
> > + * synchronous low-byte value
> > + */
> > + ret = regmap_read(data->regmap,
> > + NCT7363_REG_FANINx_HVAL(i), &hi);
> > + if (ret)
> > + goto error;
> > +
> > + ret = regmap_read(data->regmap,
> > + NCT7363_REG_FANINx_LVAL(i), &lo);
> > + if (ret)
> > + goto error;
> > +
> > + data->fan[i] = (hi << 5) | (lo & NCT7363_FANINx_LVAL_MASK);
> > + }
> > +
> > + for (i = 0; i < ARRAY_SIZE(data->pwm); i++) {
> > + if (!(data->pwm_mask & BIT_CHECK(i)))
> > + continue;
> > +
> > + ret = regmap_read(data->regmap,
> > + NCT7363_REG_FSCPxDUTY(i), ®val);
> > + if (ret)
> > + goto error;
> > +
> > + data->pwm[i] = regval;
> > + }
> > +
> > + data->last_updated = jiffies;
> > + data->valid = true;
> > +
> > +error:
> > + if (ret)
> > + data = ERR_PTR(ret);
> > +
> > +no_sensor_update:
> > + mutex_unlock(&data->update_lock);
> > +
> > + return data;
> > +}
> > +
> > +static int nct7363_read_fan(struct device *dev, u32 attr, int channel,
> > + long *val)
> > +{
> > + struct nct7363_data *data = nct7363_update_device(dev);
> > + u16 cnt, rpm;
> > +
> > + if (IS_ERR(data))
> > + return PTR_ERR(data);
> > +
> > + switch (attr) {
> > + case hwmon_fan_input:
> > + cnt = data->fan[channel] & NCT7363_FANIN_MASK;
> > + rpm = FAN_FROM_REG(cnt);
> > + *val = (long)rpm;
> > + return 0;
> > + default:
> > + return -EOPNOTSUPP;
> > + }
> > +}
> > +
> > +static umode_t nct7363_fan_is_visible(const void *_data, u32 attr, int channel)
> > +{
> > + const struct nct7363_data *data = _data;
> > +
> > + switch (attr) {
> > + case hwmon_fan_input:
> > + if (data->fanin_mask & BIT_CHECK(channel))
> > + return 0444;
> > + break;
> > + default:
> > + break;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int nct7363_read_pwm(struct device *dev, u32 attr, int channel,
> > + long *val)
> > +{
> > + struct nct7363_data *data = nct7363_update_device(dev);
> > + u16 ret;
> > +
> > + if (IS_ERR(data))
> > + return PTR_ERR(data);
> > +
> > + switch (attr) {
> > + case hwmon_pwm_input:
> > + ret = data->pwm[channel];
> > + *val = (long)ret;
> > + return 0;
> > + default:
> > + return -EOPNOTSUPP;
> > + }
> > +}
> > +
> > +static int nct7363_write_pwm(struct device *dev, u32 attr, int channel,
> > + long val)
> > +{
> > + struct nct7363_data *data = nct7363_update_device(dev);
> > + int ret;
> > +
> > + if (IS_ERR(data))
> > + return PTR_ERR(data);
> > +
> > + switch (attr) {
> > + case hwmon_pwm_input:
> > + if (val < 0 || val > 255)
> > + return -EINVAL;
> > + mutex_lock(&data->update_lock);
> > + ret = regmap_write(data->regmap,
> > + NCT7363_REG_FSCPxDUTY(channel), val);
> > + if (ret == 0)
> > + data->pwm[channel] = val;
> > + mutex_unlock(&data->update_lock);
> > + return ret;
> > +
> > + default:
> > + return -EOPNOTSUPP;
> > + }
> > +}
> > +
> > +static umode_t nct7363_pwm_is_visible(const void *_data, u32 attr, int channel)
> > +{
> > + const struct nct7363_data *data = _data;
> > +
> > + switch (attr) {
> > + case hwmon_pwm_input:
> > + if (data->pwm_mask & BIT_CHECK(channel))
> > + return 0644;
> > + break;
> > + default:
> > + break;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int nct7363_read(struct device *dev, enum hwmon_sensor_types type,
> > + u32 attr, int channel, long *val)
> > +{
> > + switch (type) {
> > + case hwmon_fan:
> > + return nct7363_read_fan(dev, attr, channel, val);
> > + case hwmon_pwm:
> > + return nct7363_read_pwm(dev, attr, channel, val);
> > + default:
> > + return -EOPNOTSUPP;
> > + }
> > +}
> > +
> > +static int nct7363_write(struct device *dev, enum hwmon_sensor_types type,
> > + u32 attr, int channel, long val)
> > +{
> > + switch (type) {
> > + case hwmon_pwm:
> > + return nct7363_write_pwm(dev, attr, channel, val);
> > + default:
> > + return -EOPNOTSUPP;
> > + }
> > +}
> > +
> > +static umode_t nct7363_is_visible(const void *data,
> > + enum hwmon_sensor_types type,
> > + u32 attr, int channel)
> > +{
> > + switch (type) {
> > + case hwmon_fan:
> > + return nct7363_fan_is_visible(data, attr, channel);
> > + case hwmon_pwm:
> > + return nct7363_pwm_is_visible(data, attr, channel);
> > + default:
> > + return 0;
> > + }
> > +}
> > +
> > +static const struct hwmon_channel_info *nct7363_info[] = {
> > + HWMON_CHANNEL_INFO(fan,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT),
> > + HWMON_CHANNEL_INFO(pwm,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT),
> > + NULL
> > +};
> > +
> > +static const struct hwmon_ops nct7363_hwmon_ops = {
> > + .is_visible = nct7363_is_visible,
> > + .read = nct7363_read,
> > + .write = nct7363_write,
> > +};
> > +
> > +static const struct hwmon_chip_info nct7363_chip_info = {
> > + .ops = &nct7363_hwmon_ops,
> > + .info = nct7363_info,
> > +};
> > +
> > +/* Return 0 if detection is successful, -ENODEV otherwise */
> > +static int nct7363_detect(struct i2c_client *client,
> > + struct i2c_board_info *info)
> > +{
> > + struct i2c_adapter *adapter = client->adapter;
> > + int vendor, chip, device;
> > +
> > + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
> > + return -ENODEV;
> > +
> > + vendor = i2c_smbus_read_byte_data(client, NCT7363_REG_VENDOR_ID);
> > + if (vendor != NUVOTON_ID)
> > + return -ENODEV;
> > +
> > + chip = i2c_smbus_read_byte_data(client, NCT7363_REG_CHIP_ID);
> > + if (chip != CHIP_ID)
> > + return -ENODEV;
> > +
> > + device = i2c_smbus_read_byte_data(client, NCT7363_REG_DEVICE_ID);
> > + if (device != DEVICE_ID)
> > + return -ENODEV;
> > +
> > + strscpy(info->type, "nct7363", I2C_NAME_SIZE);
> > +
> > + return 0;
> > +}
>
> Chip auto-detection is undesirable for new drivers since it increases
> boot time. Please consider dropping this if it is not really needed
> for some actual use case.
ok, fix in v4
>
> > +
> > +static int nct7363_init_chip(struct nct7363_data *data)
> > +{
> > + u8 i, gpio0_3 = 0, gpio4_7 = 0, gpio10_13 = 0, gpio14_17 = 0;
> > + int ret;
> > +
> > + for (i = 0; i < NCT7363_PWM_COUNT; i++) {
> > + if (i < 4) {
> > + if (data->pwm_mask & BIT_CHECK(i))
> > + gpio0_3 |= PWM_SEL(i);
> > + if (data->fanin_mask & BIT_CHECK(i))
> > + gpio10_13 |= FANIN_SEL(i);
> > + } else if (i < 8) {
> > + if (data->pwm_mask & BIT_CHECK(i))
> > + gpio4_7 |= PWM_SEL(i);
> > + if (data->fanin_mask & BIT_CHECK(i))
> > + gpio14_17 |= FANIN_SEL(i);
> > + } else if (i < 12) {
> > + if (data->pwm_mask & BIT_CHECK(i))
> > + gpio10_13 |= PWM_SEL(i);
> > + if (data->fanin_mask & BIT_CHECK(i))
> > + gpio0_3 |= FANIN_SEL(i);
> > + } else {
> > + if (data->pwm_mask & BIT_CHECK(i))
> > + gpio14_17 |= PWM_SEL(i);
> > + if (data->fanin_mask & BIT_CHECK(i))
> > + gpio4_7 |= FANIN_SEL(i);
> > + }
> > + }
> > +
> > + /* Pin Function Configuration */
> > + ret = regmap_write(data->regmap, NCT7363_REG_GPIO_0_3, gpio0_3);
> > + if (ret < 0)
> > + return ret;
> > + ret = regmap_write(data->regmap, NCT7363_REG_GPIO_4_7, gpio4_7);
> > + if (ret < 0)
> > + return ret;
> > + ret = regmap_write(data->regmap, NCT7363_REG_GPIO_10_13, gpio10_13);
> > + if (ret < 0)
> > + return ret;
> > + ret = regmap_write(data->regmap, NCT7363_REG_GPIO_14_17, gpio14_17);
> > + if (ret < 0)
> > + return ret;
> > +
> > + /* PWM and FANIN Monitoring Enable */
> > + ret = regmap_write(data->regmap, NCT7363_REG_PWMEN_0_7,
> > + data->pwm_mask & 0xff);
> > + if (ret < 0)
> > + return ret;
> > + ret = regmap_write(data->regmap, NCT7363_REG_PWMEN_8_15,
> > + (data->pwm_mask >> 8) & 0xff);
> > + if (ret < 0)
> > + return ret;
> > + ret = regmap_write(data->regmap, NCT7363_REG_FANINEN_0_7,
> > + data->fanin_mask & 0xff);
> > + if (ret < 0)
> > + return ret;
> > + ret = regmap_write(data->regmap, NCT7363_REG_FANINEN_8_15,
> > + (data->fanin_mask >> 8) & 0xff);
> > + if (ret < 0)
> > + return ret;
> > +
> > + return 0;
> > +}
> > +
> > +static int nct7363_present_pwm_fanin(struct device *dev,
> > + struct device_node *child,
> > + struct nct7363_data *data)
> > +{
> > + struct of_phandle_args args;
> > + int ret, fanin_cnt;
> > + u8 *fanin_ch;
> > + u8 ch, index;
> > +
> > + ret = of_parse_phandle_with_args(child, "pwms", "#pwm-cells",
> > + 0, &args);
> > + if (ret)
> > + return ret;
> > +
> > + data->pwm_mask |= BIT(args.args[0]);
> > +
> > + fanin_cnt = of_property_count_u8_elems(child, "tach-ch");
> > + if (fanin_cnt < 1)
> > + return -EINVAL;
> > +
> > + fanin_ch = devm_kcalloc(dev, fanin_cnt, sizeof(*fanin_ch), GFP_KERNEL);
> > + if (!fanin_ch)
> > + return -ENOMEM;
> > +
> > + ret = of_property_read_u8_array(child, "tach-ch", fanin_ch, fanin_cnt);
> > + if (ret)
> > + return ret;
> > +
> > + for (ch = 0; ch < fanin_cnt; ch++) {
> > + index = fanin_ch[ch];
> > + data->fanin_mask |= BIT(index);
> > + }
> > +
> > + return 0;
> > +}
>
> I didn't check if this aligns with the fan bindings schema. Unfortunately
> the dt maintainer's reviewed-by: tag got lost with
> https://patchwork.kernel.org/project/linux-hwmon/patch/20231222013352.3873689-2-kcfeng0@nuvoton.com/
>
> o we can not really move forward until that is resolved.
ok, I'll keep monitoring the fan binding schema.
Thanks,
Ban
>
> > +
> > +static const struct regmap_config nct7363_regmap_config = {
> > + .reg_bits = 8,
> > + .val_bits = 8,
> > +};
> > +
> > +static int nct7363_probe(struct i2c_client *client)
> > +{
> > + struct device *dev = &client->dev;
> > + struct device_node *child;
> > + struct nct7363_data *data;
> > + struct device *hwmon_dev;
> > + int ret;
> > +
> > + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
> > + if (!data)
> > + return -ENOMEM;
> > +
> > + data->regmap = devm_regmap_init_i2c(client, &nct7363_regmap_config);
> > + if (IS_ERR(data->regmap))
> > + return PTR_ERR(data->regmap);
> > +
> > + mutex_init(&data->update_lock);
> > +
> > + for_each_child_of_node(dev->of_node, child) {
> > + ret = nct7363_present_pwm_fanin(dev, child, data);
> > + if (ret) {
> > + of_node_put(child);
> > + return ret;
> > + }
> > + }
> > +
> > + /* Initialize the chip */
> > + ret = nct7363_init_chip(data);
> > + if (ret)
> > + return ret;
> > +
> > + hwmon_dev =
> > + devm_hwmon_device_register_with_info(dev, client->name, data,
> > + &nct7363_chip_info, NULL);
> > + return PTR_ERR_OR_ZERO(hwmon_dev);
> > +}
> > +
> > +static struct i2c_driver nct7363_driver = {
> > + .class = I2C_CLASS_HWMON,
> > + .driver = {
> > + .name = "nct7363",
> > + .of_match_table = nct7363_of_match,
> > + },
> > + .probe = nct7363_probe,
> > + .id_table = nct7363_id,
> > + .detect = nct7363_detect,
> > + .address_list = normal_i2c,
> > +};
> > +
> > +module_i2c_driver(nct7363_driver);
> > +
> > +MODULE_AUTHOR("CW Ho <cwho@nuvoton.com>");
> > +MODULE_AUTHOR("Ban Feng <kcfeng0@nuvoton.com>");
> > +MODULE_DESCRIPTION("NCT7363 Hardware Monitoring Driver");
> > +MODULE_LICENSE("GPL");
WARNING: multiple messages have this Message-ID (diff)
From: Ban Feng <baneric926@gmail.com>
To: Guenter Roeck <linux@roeck-us.net>
Cc: linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org,
conor+dt@kernel.org, jdelvare@suse.com, corbet@lwn.net,
openbmc@lists.ozlabs.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, DELPHINE_CHIU@wiwynn.com,
naresh.solanki@9elements.com, billy_tsai@aspeedtech.com,
kcfeng0@nuvoton.com, robh+dt@kernel.org,
krzysztof.kozlowski+dt@linaro.org, kwliu@nuvoton.com
Subject: Re: [PATCH v3 3/3] hwmon: Driver for Nuvoton NCT7363Y
Date: Wed, 21 Feb 2024 09:26:34 +0800 [thread overview]
Message-ID: <CALz278bNWxgVZz7mjtsiQz+aU837+eNsebbJM6M07S0_CQgx4Q@mail.gmail.com> (raw)
In-Reply-To: <4ba56d33-cc58-44e1-9f2e-9fa7865e4537@roeck-us.net>
Hi Guenter,
On Sat, Feb 3, 2024 at 11:06 PM Guenter Roeck <linux@roeck-us.net> wrote:
>
> On Fri, Dec 22, 2023 at 09:33:52AM +0800, baneric926@gmail.com wrote:
> > From: Ban Feng <kcfeng0@nuvoton.com>
> >
> > NCT7363Y is an I2C based hardware monitoring chip from Nuvoton.
> >
> > Signed-off-by: Ban Feng <kcfeng0@nuvoton.com>
>
> Sorry for the late reply. I was waiting for the fan schema to be accepted,
> but it looks like that may take more time.
>
> Please fix the various issues reported by checkpatch --strict.
> Additional comments inline.
ok, fix in v4
>
> > ---
> > Documentation/hwmon/index.rst | 1 +
> > Documentation/hwmon/nct7363.rst | 33 ++
> > MAINTAINERS | 2 +
> > drivers/hwmon/Kconfig | 11 +
> > drivers/hwmon/Makefile | 1 +
> > drivers/hwmon/nct7363.c | 515 ++++++++++++++++++++++++++++++++
> > 6 files changed, 563 insertions(+)
> > create mode 100644 Documentation/hwmon/nct7363.rst
> > create mode 100644 drivers/hwmon/nct7363.c
> >
> > diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
> > index 72f4e6065bae..178d3cae95de 100644
> > --- a/Documentation/hwmon/index.rst
> > +++ b/Documentation/hwmon/index.rst
> > @@ -161,6 +161,7 @@ Hardware Monitoring Kernel Drivers
> > mp5023
> > nct6683
> > nct6775
> > + nct7363
> > nct7802
> > nct7904
> > npcm750-pwm-fan
> > diff --git a/Documentation/hwmon/nct7363.rst b/Documentation/hwmon/nct7363.rst
> > new file mode 100644
> > index 000000000000..89699c95aa4b
> > --- /dev/null
> > +++ b/Documentation/hwmon/nct7363.rst
> > @@ -0,0 +1,33 @@
> > +.. SPDX-License-Identifier: GPL-2.0
> > +
> > +Kernel driver nct7363
> > +=====================
> > +
> > +Supported chip:
> > +
> > + * Nuvoton NCT7363Y
> > +
> > + Prefix: nct7363
> > +
> > + Addresses: I2C 0x20, 0x21, 0x22, 0x23
> > +
> > +Author: Ban Feng <kcfeng0@nuvoton.com>
> > +
> > +
> > +Description
> > +-----------
> > +
> > +The NCT7363Y is a Fan controller which provides up to 16 independent
> > +FAN input monitors, and up to 16 independent PWM output with SMBus interface.
> > +
> > +
> > +Sysfs entries
> > +-------------
> > +
> > +Currently, the driver supports the following features:
> > +
> > +======================= =======================================================
> > +fanX_input provide current fan rotation value in RPM
> > +
> > +pwmX get or set PWM fan control value.
> > +======================= =======================================================
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index 53cfcc629aa1..e39c4fc01a3b 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -14842,6 +14842,8 @@ M: Ban Feng <kcfeng0@nuvoton.com>
> > L: linux-hwmon@vger.kernel.org
> > S: Maintained
> > F: Documentation/devicetree/bindings/hwmon/nuvoton,nct7363.yaml
> > +F: Documentation/hwmon/nct7363.rst
> > +F: drivers/hwmon/nct7363.c
> >
> > NETDEVSIM
> > M: Jakub Kicinski <kuba@kernel.org>
> > diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> > index cf27523eed5a..a0229851fc64 100644
> > --- a/drivers/hwmon/Kconfig
> > +++ b/drivers/hwmon/Kconfig
> > @@ -1605,6 +1605,17 @@ config SENSORS_NCT6775_I2C
> > This driver can also be built as a module. If so, the module
> > will be called nct6775-i2c.
> >
> > +config SENSORS_NCT7363
> > + tristate "Nuvoton NCT7363Y"
> > + depends on I2C
> > + select REGMAP_I2C
> > + help
> > + If you say yes here you get support for the Nuvoton NCT7363Y,
> > + hardware monitoring chip.
> > +
> > + This driver can also be built as a module. If so, the module
> > + will be called nct7363.
> > +
> > config SENSORS_NCT7802
> > tristate "Nuvoton NCT7802Y"
> > depends on I2C
> > diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> > index e84bd9685b5c..dd794aa06209 100644
> > --- a/drivers/hwmon/Makefile
> > +++ b/drivers/hwmon/Makefile
> > @@ -166,6 +166,7 @@ obj-$(CONFIG_SENSORS_NCT6775_CORE) += nct6775-core.o
> > nct6775-objs := nct6775-platform.o
> > obj-$(CONFIG_SENSORS_NCT6775) += nct6775.o
> > obj-$(CONFIG_SENSORS_NCT6775_I2C) += nct6775-i2c.o
> > +obj-$(CONFIG_SENSORS_NCT7363) += nct7363.o
> > obj-$(CONFIG_SENSORS_NCT7802) += nct7802.o
> > obj-$(CONFIG_SENSORS_NCT7904) += nct7904.o
> > obj-$(CONFIG_SENSORS_NPCM7XX) += npcm750-pwm-fan.o
> > diff --git a/drivers/hwmon/nct7363.c b/drivers/hwmon/nct7363.c
> > new file mode 100644
> > index 000000000000..1bf6e83afd7f
> > --- /dev/null
> > +++ b/drivers/hwmon/nct7363.c
> > @@ -0,0 +1,515 @@
> > +// SPDX-License-Identifier: GPL-2.0-or-later
> > +/*
> > + * Copyright (c) 2023 Nuvoton Technology corporation.
> > + */
> > +
> > +#include <linux/bitfield.h>
> > +#include <linux/bits.h>
> > +#include <linux/err.h>
> > +#include <linux/hwmon.h>
> > +#include <linux/hwmon-sysfs.h>
> > +#include <linux/i2c.h>
> > +#include <linux/jiffies.h>
> > +#include <linux/module.h>
> > +#include <linux/mutex.h>
> > +#include <linux/regmap.h>
> > +#include <linux/slab.h>
> > +
> > +#define NCT7363_REG_GPIO_0_3 0x20
> > +#define NCT7363_REG_GPIO_4_7 0x21
> > +#define NCT7363_REG_GPIO_10_13 0x22
> > +#define NCT7363_REG_GPIO_14_17 0x23
> > +#define NCT7363_REG_PWMEN_0_7 0x38
> > +#define NCT7363_REG_PWMEN_8_15 0x39
> > +#define NCT7363_REG_FANINEN_0_7 0x41
> > +#define NCT7363_REG_FANINEN_8_15 0x42
> > +#define NCT7363_REG_FANINx_HVAL(x) (0x48 + ((x) * 2))
> > +#define NCT7363_REG_FANINx_LVAL(x) (0x49 + ((x) * 2))
> > +#define NCT7363_REG_FSCPxDUTY(x) (0x90 + ((x) * 2))
> > +#define NCT7363_REG_VENDOR_ID 0xFD
> > +#define NCT7363_REG_CHIP_ID 0xFE
> > +#define NCT7363_REG_DEVICE_ID 0xFF
> > +
> > +#define NUVOTON_ID 0x49
> > +#define CHIP_ID 0x19
> > +#define DEVICE_ID 0x88
> > +
> > +#define PWM_SEL(x) (BIT(0) << ((x % 4) * 2))
> > +#define FANIN_SEL(x) (BIT(1) << ((x % 4) * 2))
>
> (x). checkpatch -strict does report this.
ok, fix in v4
>
> > +#define BIT_CHECK(x) (BIT(0) << x)
>
> This is identical to BIT(x) so I really don't get the point.
ok, fix in v4
>
> > +
> > +#define NCT7363_FANINx_LVAL_MASK GENMASK(4, 0)
>
> No CamelCase defines or variables, please.
ok, fix in v4
>
> > +#define NCT7363_FANIN_MASK GENMASK(12, 0)
> > +
> > +#define NCT7363_PWM_COUNT 16
> > +#define NCT7363_FANIN_COUNT 16
> > +
> > +#define REFRESH_INTERVAL (2 * HZ)
> > +
> > +static inline unsigned long FAN_FROM_REG(u16 val)
> > +{
> > + if ((val >= NCT7363_FANIN_MASK) || (val == 0))
>
> Unnecessary () as reported by checkpatch.
ok, fix in v4
>
> Too bad the datasheet isn't public. It would be useful to know what
> it means if the upper bits are set. Unconditionally reporting a fan
> speed of 0 if any of the bits are set seems excessive unless there
> is a good reason for it. If those bits indicate fan faults,
> it might make sense to implement respective attributes.
>
> [ Why do you keep this chip and NCT7362Y so secretive ? ]
It's only a double check for the bit range from 0 to 12.
I'll consider if this is still needed after dropping the local caching.
>
> > + return 0;
> > +
> > + return (1350000UL / val);
> > +}
> > +
> > +static const unsigned short normal_i2c[] = {
> > + 0x20, 0x21, 0x22, 0x23, I2C_CLIENT_END
> > +};
> > +
> > +enum chips { nct7363 };
>
> Unnecessary. If there are plans for this driver to support more chips
> in the future, the enum can be added at that time. Yes, I can see in
> Nuvoton's 2024 product selection document that there is a NCT7362Y
> with the same number of fan and pwm channels, but that doesn't help
> if the chips are kept under wrap.
so far only focus on NCT7363Y, I'll fix in v4
>
> Searching for the chips on the internet, I am reminded of
> https://lore.kernel.org/lkml/20230607101827.8544-4-zev@bewilderbeest.net/T/
> which introduces a quite similar driver with more functionality for NCT7362Y.
> That submission even mentions a NCT7360 with 8 channels. Quite frankly
> I am inclined to reject both drivers (not that I ever got an update for
> the NCT7362Y driver, but anyway) until I get a better understanding
> of the similarities and differences between NCT7362Y and NCT7363Y.
> Please consider sending me datasheets for those chips.
Sure, I'll send the relevant datasheet to you.
>
> > +
> > +static const struct i2c_device_id nct7363_id[] = {
> > + { "nct7363", nct7363 },
> > + { }
> > +};
> > +MODULE_DEVICE_TABLE(i2c, nct7363_id);
> > +
> > +static const struct of_device_id nct7363_of_match[] = {
> > + { .compatible = "nuvoton,nct7363", .data = (void *)nct7363 },
> > + { },
> > +};
> > +MODULE_DEVICE_TABLE(of, nct7363_of_match);
> > +
> > +struct nct7363_data {
> > + struct regmap *regmap;
> > + struct mutex update_lock;
> > + bool valid;
> > + unsigned long last_updated; /* In jiffies */
> > +
> > + u16 fanin_mask;
> > + u16 fan[NCT7363_FANIN_COUNT];
> > + u16 pwm_mask;
> > + u8 pwm[NCT7363_PWM_COUNT];
> > +};
> > +
> > +static struct nct7363_data *nct7363_update_device(struct device *dev)
>
> Personally I recommend to drop all local caching and just read values
> through regmap as requested.
ok, fix in v4
>
> > +{
> > + struct nct7363_data *data = dev_get_drvdata(dev);
> > + unsigned int hi, lo, regval;
> > + int i, ret = 0;
> > +
> > + mutex_lock(&data->update_lock);
> > +
> > + if (!(time_after(jiffies, data->last_updated + REFRESH_INTERVAL)
> > + || !data->valid))
> > + goto no_sensor_update;
> > +
> > + for (i = 0; i < ARRAY_SIZE(data->fan); i++) {
> > + if (!(data->fanin_mask & BIT_CHECK(i)))
> > + continue;
> > +
> > + /*
> > + * High-byte register should be read first to latch
> > + * synchronous low-byte value
> > + */
> > + ret = regmap_read(data->regmap,
> > + NCT7363_REG_FANINx_HVAL(i), &hi);
> > + if (ret)
> > + goto error;
> > +
> > + ret = regmap_read(data->regmap,
> > + NCT7363_REG_FANINx_LVAL(i), &lo);
> > + if (ret)
> > + goto error;
> > +
> > + data->fan[i] = (hi << 5) | (lo & NCT7363_FANINx_LVAL_MASK);
> > + }
> > +
> > + for (i = 0; i < ARRAY_SIZE(data->pwm); i++) {
> > + if (!(data->pwm_mask & BIT_CHECK(i)))
> > + continue;
> > +
> > + ret = regmap_read(data->regmap,
> > + NCT7363_REG_FSCPxDUTY(i), ®val);
> > + if (ret)
> > + goto error;
> > +
> > + data->pwm[i] = regval;
> > + }
> > +
> > + data->last_updated = jiffies;
> > + data->valid = true;
> > +
> > +error:
> > + if (ret)
> > + data = ERR_PTR(ret);
> > +
> > +no_sensor_update:
> > + mutex_unlock(&data->update_lock);
> > +
> > + return data;
> > +}
> > +
> > +static int nct7363_read_fan(struct device *dev, u32 attr, int channel,
> > + long *val)
> > +{
> > + struct nct7363_data *data = nct7363_update_device(dev);
> > + u16 cnt, rpm;
> > +
> > + if (IS_ERR(data))
> > + return PTR_ERR(data);
> > +
> > + switch (attr) {
> > + case hwmon_fan_input:
> > + cnt = data->fan[channel] & NCT7363_FANIN_MASK;
> > + rpm = FAN_FROM_REG(cnt);
> > + *val = (long)rpm;
> > + return 0;
> > + default:
> > + return -EOPNOTSUPP;
> > + }
> > +}
> > +
> > +static umode_t nct7363_fan_is_visible(const void *_data, u32 attr, int channel)
> > +{
> > + const struct nct7363_data *data = _data;
> > +
> > + switch (attr) {
> > + case hwmon_fan_input:
> > + if (data->fanin_mask & BIT_CHECK(channel))
> > + return 0444;
> > + break;
> > + default:
> > + break;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int nct7363_read_pwm(struct device *dev, u32 attr, int channel,
> > + long *val)
> > +{
> > + struct nct7363_data *data = nct7363_update_device(dev);
> > + u16 ret;
> > +
> > + if (IS_ERR(data))
> > + return PTR_ERR(data);
> > +
> > + switch (attr) {
> > + case hwmon_pwm_input:
> > + ret = data->pwm[channel];
> > + *val = (long)ret;
> > + return 0;
> > + default:
> > + return -EOPNOTSUPP;
> > + }
> > +}
> > +
> > +static int nct7363_write_pwm(struct device *dev, u32 attr, int channel,
> > + long val)
> > +{
> > + struct nct7363_data *data = nct7363_update_device(dev);
> > + int ret;
> > +
> > + if (IS_ERR(data))
> > + return PTR_ERR(data);
> > +
> > + switch (attr) {
> > + case hwmon_pwm_input:
> > + if (val < 0 || val > 255)
> > + return -EINVAL;
> > + mutex_lock(&data->update_lock);
> > + ret = regmap_write(data->regmap,
> > + NCT7363_REG_FSCPxDUTY(channel), val);
> > + if (ret == 0)
> > + data->pwm[channel] = val;
> > + mutex_unlock(&data->update_lock);
> > + return ret;
> > +
> > + default:
> > + return -EOPNOTSUPP;
> > + }
> > +}
> > +
> > +static umode_t nct7363_pwm_is_visible(const void *_data, u32 attr, int channel)
> > +{
> > + const struct nct7363_data *data = _data;
> > +
> > + switch (attr) {
> > + case hwmon_pwm_input:
> > + if (data->pwm_mask & BIT_CHECK(channel))
> > + return 0644;
> > + break;
> > + default:
> > + break;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int nct7363_read(struct device *dev, enum hwmon_sensor_types type,
> > + u32 attr, int channel, long *val)
> > +{
> > + switch (type) {
> > + case hwmon_fan:
> > + return nct7363_read_fan(dev, attr, channel, val);
> > + case hwmon_pwm:
> > + return nct7363_read_pwm(dev, attr, channel, val);
> > + default:
> > + return -EOPNOTSUPP;
> > + }
> > +}
> > +
> > +static int nct7363_write(struct device *dev, enum hwmon_sensor_types type,
> > + u32 attr, int channel, long val)
> > +{
> > + switch (type) {
> > + case hwmon_pwm:
> > + return nct7363_write_pwm(dev, attr, channel, val);
> > + default:
> > + return -EOPNOTSUPP;
> > + }
> > +}
> > +
> > +static umode_t nct7363_is_visible(const void *data,
> > + enum hwmon_sensor_types type,
> > + u32 attr, int channel)
> > +{
> > + switch (type) {
> > + case hwmon_fan:
> > + return nct7363_fan_is_visible(data, attr, channel);
> > + case hwmon_pwm:
> > + return nct7363_pwm_is_visible(data, attr, channel);
> > + default:
> > + return 0;
> > + }
> > +}
> > +
> > +static const struct hwmon_channel_info *nct7363_info[] = {
> > + HWMON_CHANNEL_INFO(fan,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT,
> > + HWMON_F_INPUT),
> > + HWMON_CHANNEL_INFO(pwm,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT,
> > + HWMON_PWM_INPUT),
> > + NULL
> > +};
> > +
> > +static const struct hwmon_ops nct7363_hwmon_ops = {
> > + .is_visible = nct7363_is_visible,
> > + .read = nct7363_read,
> > + .write = nct7363_write,
> > +};
> > +
> > +static const struct hwmon_chip_info nct7363_chip_info = {
> > + .ops = &nct7363_hwmon_ops,
> > + .info = nct7363_info,
> > +};
> > +
> > +/* Return 0 if detection is successful, -ENODEV otherwise */
> > +static int nct7363_detect(struct i2c_client *client,
> > + struct i2c_board_info *info)
> > +{
> > + struct i2c_adapter *adapter = client->adapter;
> > + int vendor, chip, device;
> > +
> > + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
> > + return -ENODEV;
> > +
> > + vendor = i2c_smbus_read_byte_data(client, NCT7363_REG_VENDOR_ID);
> > + if (vendor != NUVOTON_ID)
> > + return -ENODEV;
> > +
> > + chip = i2c_smbus_read_byte_data(client, NCT7363_REG_CHIP_ID);
> > + if (chip != CHIP_ID)
> > + return -ENODEV;
> > +
> > + device = i2c_smbus_read_byte_data(client, NCT7363_REG_DEVICE_ID);
> > + if (device != DEVICE_ID)
> > + return -ENODEV;
> > +
> > + strscpy(info->type, "nct7363", I2C_NAME_SIZE);
> > +
> > + return 0;
> > +}
>
> Chip auto-detection is undesirable for new drivers since it increases
> boot time. Please consider dropping this if it is not really needed
> for some actual use case.
ok, fix in v4
>
> > +
> > +static int nct7363_init_chip(struct nct7363_data *data)
> > +{
> > + u8 i, gpio0_3 = 0, gpio4_7 = 0, gpio10_13 = 0, gpio14_17 = 0;
> > + int ret;
> > +
> > + for (i = 0; i < NCT7363_PWM_COUNT; i++) {
> > + if (i < 4) {
> > + if (data->pwm_mask & BIT_CHECK(i))
> > + gpio0_3 |= PWM_SEL(i);
> > + if (data->fanin_mask & BIT_CHECK(i))
> > + gpio10_13 |= FANIN_SEL(i);
> > + } else if (i < 8) {
> > + if (data->pwm_mask & BIT_CHECK(i))
> > + gpio4_7 |= PWM_SEL(i);
> > + if (data->fanin_mask & BIT_CHECK(i))
> > + gpio14_17 |= FANIN_SEL(i);
> > + } else if (i < 12) {
> > + if (data->pwm_mask & BIT_CHECK(i))
> > + gpio10_13 |= PWM_SEL(i);
> > + if (data->fanin_mask & BIT_CHECK(i))
> > + gpio0_3 |= FANIN_SEL(i);
> > + } else {
> > + if (data->pwm_mask & BIT_CHECK(i))
> > + gpio14_17 |= PWM_SEL(i);
> > + if (data->fanin_mask & BIT_CHECK(i))
> > + gpio4_7 |= FANIN_SEL(i);
> > + }
> > + }
> > +
> > + /* Pin Function Configuration */
> > + ret = regmap_write(data->regmap, NCT7363_REG_GPIO_0_3, gpio0_3);
> > + if (ret < 0)
> > + return ret;
> > + ret = regmap_write(data->regmap, NCT7363_REG_GPIO_4_7, gpio4_7);
> > + if (ret < 0)
> > + return ret;
> > + ret = regmap_write(data->regmap, NCT7363_REG_GPIO_10_13, gpio10_13);
> > + if (ret < 0)
> > + return ret;
> > + ret = regmap_write(data->regmap, NCT7363_REG_GPIO_14_17, gpio14_17);
> > + if (ret < 0)
> > + return ret;
> > +
> > + /* PWM and FANIN Monitoring Enable */
> > + ret = regmap_write(data->regmap, NCT7363_REG_PWMEN_0_7,
> > + data->pwm_mask & 0xff);
> > + if (ret < 0)
> > + return ret;
> > + ret = regmap_write(data->regmap, NCT7363_REG_PWMEN_8_15,
> > + (data->pwm_mask >> 8) & 0xff);
> > + if (ret < 0)
> > + return ret;
> > + ret = regmap_write(data->regmap, NCT7363_REG_FANINEN_0_7,
> > + data->fanin_mask & 0xff);
> > + if (ret < 0)
> > + return ret;
> > + ret = regmap_write(data->regmap, NCT7363_REG_FANINEN_8_15,
> > + (data->fanin_mask >> 8) & 0xff);
> > + if (ret < 0)
> > + return ret;
> > +
> > + return 0;
> > +}
> > +
> > +static int nct7363_present_pwm_fanin(struct device *dev,
> > + struct device_node *child,
> > + struct nct7363_data *data)
> > +{
> > + struct of_phandle_args args;
> > + int ret, fanin_cnt;
> > + u8 *fanin_ch;
> > + u8 ch, index;
> > +
> > + ret = of_parse_phandle_with_args(child, "pwms", "#pwm-cells",
> > + 0, &args);
> > + if (ret)
> > + return ret;
> > +
> > + data->pwm_mask |= BIT(args.args[0]);
> > +
> > + fanin_cnt = of_property_count_u8_elems(child, "tach-ch");
> > + if (fanin_cnt < 1)
> > + return -EINVAL;
> > +
> > + fanin_ch = devm_kcalloc(dev, fanin_cnt, sizeof(*fanin_ch), GFP_KERNEL);
> > + if (!fanin_ch)
> > + return -ENOMEM;
> > +
> > + ret = of_property_read_u8_array(child, "tach-ch", fanin_ch, fanin_cnt);
> > + if (ret)
> > + return ret;
> > +
> > + for (ch = 0; ch < fanin_cnt; ch++) {
> > + index = fanin_ch[ch];
> > + data->fanin_mask |= BIT(index);
> > + }
> > +
> > + return 0;
> > +}
>
> I didn't check if this aligns with the fan bindings schema. Unfortunately
> the dt maintainer's reviewed-by: tag got lost with
> https://patchwork.kernel.org/project/linux-hwmon/patch/20231222013352.3873689-2-kcfeng0@nuvoton.com/
>
> o we can not really move forward until that is resolved.
ok, I'll keep monitoring the fan binding schema.
Thanks,
Ban
>
> > +
> > +static const struct regmap_config nct7363_regmap_config = {
> > + .reg_bits = 8,
> > + .val_bits = 8,
> > +};
> > +
> > +static int nct7363_probe(struct i2c_client *client)
> > +{
> > + struct device *dev = &client->dev;
> > + struct device_node *child;
> > + struct nct7363_data *data;
> > + struct device *hwmon_dev;
> > + int ret;
> > +
> > + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
> > + if (!data)
> > + return -ENOMEM;
> > +
> > + data->regmap = devm_regmap_init_i2c(client, &nct7363_regmap_config);
> > + if (IS_ERR(data->regmap))
> > + return PTR_ERR(data->regmap);
> > +
> > + mutex_init(&data->update_lock);
> > +
> > + for_each_child_of_node(dev->of_node, child) {
> > + ret = nct7363_present_pwm_fanin(dev, child, data);
> > + if (ret) {
> > + of_node_put(child);
> > + return ret;
> > + }
> > + }
> > +
> > + /* Initialize the chip */
> > + ret = nct7363_init_chip(data);
> > + if (ret)
> > + return ret;
> > +
> > + hwmon_dev =
> > + devm_hwmon_device_register_with_info(dev, client->name, data,
> > + &nct7363_chip_info, NULL);
> > + return PTR_ERR_OR_ZERO(hwmon_dev);
> > +}
> > +
> > +static struct i2c_driver nct7363_driver = {
> > + .class = I2C_CLASS_HWMON,
> > + .driver = {
> > + .name = "nct7363",
> > + .of_match_table = nct7363_of_match,
> > + },
> > + .probe = nct7363_probe,
> > + .id_table = nct7363_id,
> > + .detect = nct7363_detect,
> > + .address_list = normal_i2c,
> > +};
> > +
> > +module_i2c_driver(nct7363_driver);
> > +
> > +MODULE_AUTHOR("CW Ho <cwho@nuvoton.com>");
> > +MODULE_AUTHOR("Ban Feng <kcfeng0@nuvoton.com>");
> > +MODULE_DESCRIPTION("NCT7363 Hardware Monitoring Driver");
> > +MODULE_LICENSE("GPL");
next prev parent reply other threads:[~2024-02-21 1:26 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-22 1:33 [PATCH v3 0/3] hwmon: Driver for Nuvoton NCT7363Y baneric926
2023-12-22 1:33 ` baneric926
2023-12-22 1:33 ` [PATCH v3 1/3] dt-bindings: hwmon: fan: Add fan binding to schema baneric926
2023-12-22 1:33 ` baneric926
2024-01-04 0:15 ` Rob Herring
2024-01-04 0:15 ` Rob Herring
2024-01-09 9:00 ` Ban Feng
2024-01-09 9:00 ` Ban Feng
2024-02-03 15:09 ` Guenter Roeck
2024-02-03 15:09 ` Guenter Roeck
2024-02-21 2:22 ` Ban Feng
2024-02-21 2:22 ` Ban Feng
2023-12-22 1:33 ` [PATCH v3 2/3] dt-bindings: hwmon: Add NCT7363Y documentation baneric926
2023-12-22 1:33 ` baneric926
2024-01-04 0:21 ` Rob Herring
2024-01-04 0:21 ` Rob Herring
2023-12-22 1:33 ` [PATCH v3 3/3] hwmon: Driver for Nuvoton NCT7363Y baneric926
2023-12-22 1:33 ` baneric926
2024-02-03 15:06 ` Guenter Roeck
2024-02-03 15:06 ` Guenter Roeck
2024-02-21 1:26 ` Ban Feng [this message]
2024-02-21 1:26 ` Ban Feng
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