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Date:   Thu, 26 Nov 2020 08:50:37 +0800
From:   Charles <hsu.yungteng@...il.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
        alan@...hat.com
Subject: Re: [PATCH v4] hwmon: Add driver for STMicroelectronics PM6764
 Voltage Regulator

On 22/11/2020 下午11:36, Guenter Roeck wrote:
> On Wed, Nov 11, 2020 at 03:10:08PM +0800, Charles wrote:
>> Add the pmbus driver for the STMicroelectronics pm6764 voltage regulator.
>>
>> the output voltage use the MFR_READ_VOUT 0xD4
>> vout value returned is linear11
>>
>> Signed-off-by: Charles Hsu <hsu.yungteng@...il.com>
> Please fix all checkpatch errors and warnings before resubmitting,
> and make sure that your e-mail agent does not corrupt the patch.
>
> Guenter
>

There is still a warning can't fix.

Device tree bindings should be their own patch, right?

I'm not sure which patch should I submit first.

WARNING: DT compatible string "pm6764tr" appears un-documented -- check 
./Documentation/devicetree/bindings/
#189: FILE: drivers/hwmon/pmbus/pm6764tr.c:60:

+    {.compatible = "pm6764tr"},


>> ---
>>
>> v4:
>>    - Add pm6764tr to Documentation/hwmon/index.rst.
>> v3:
>>    - Add Documentation(Documentation/hwmon/pm6764tr.rst).
>>    - Fix include order.
>> v2:
>>    - Fix formatting.
>>    - Remove pmbus_do_remove.
>>    - Change from .probe to .probe_new.
>> v1:
>>    - Initial patchset.
>> ---
>>
>>    Documentation/hwmon/index.rst    |  1 +
>>    Documentation/hwmon/pm6764tr.rst | 33 ++++++++++++++
>>    drivers/hwmon/pmbus/Kconfig      |  9 ++++
>>    drivers/hwmon/pmbus/Makefile     |  1 +
>>    drivers/hwmon/pmbus/pm6764tr.c   | 78 ++++++++++++++++++++++++++++++++
>>    5 files changed, 122 insertions(+)
>>    create mode 100644 Documentation/hwmon/pm6764tr.rst
>>    create mode 100644 drivers/hwmon/pmbus/pm6764tr.c
>>
>> +MODULE_DESCRIPTION("PMBus driver for  ST PM6764TR");
>> +MODULE_LICENSE("GPL");
>>
>> diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
>> index b797db738225..1bbd05e41de4 100644
>> --- a/Documentation/hwmon/index.rst
>> +++ b/Documentation/hwmon/index.rst
>> @@ -144,6 +144,7 @@ Hardware Monitoring Kernel Drivers
>>       pc87360
>>       pc87427
>>       pcf8591
>> +   pm6764tr
>>       pmbus
>>       powr1220
>>       pxe1610
>> diff --git a/Documentation/hwmon/pm6764tr.rst
>> b/Documentation/hwmon/pm6764tr.rst
>> new file mode 100644
>> index 000000000000..5e8092e39297
>> --- /dev/null
>> +++ b/Documentation/hwmon/pm6764tr.rst
>> @@ -0,0 +1,33 @@
>> +.. SPDX-License-Identifier: GPL-2.0-only
>> +
>> +Kernel driver pm6764tr
>> +======================
>> +
>> +Supported chips:
>> +
>> +  * ST PM6764TR
>> +
>> +    Prefix: 'pm6764tr'
>> +
>> +    Addresses scanned: -
>> +
>> +    Datasheet: http://www.st.com/resource/en/data_brief/pm6764.pdf
>> +
>> +Authors:
>> +    <hsu.yungteng@...il.com>
>> +
>> +Description:
>> +------------
>> +
>> +This driver supports the STMicroelectronics PM6764TR chip. The PM6764TR
>> is a high
>> +performance digital controller designed to power Intel’s VR12.5
>> processors and memories.
>> +
>> +The device utilizes digital technology to implement all control and
>> power management
>> +functions to provide maximum flexibility and performance. The NVM is
>> embedded to store
>> +custom configurations. The PM6764TR device features up to 4-phase
>> programmable operation.
>> +
>> +The PM6764TR supports power state transitions featuring VFDE, and
>> programmable DPM
>> +maintaining the best efficiency over all loading conditions without
>> compromising transient
>> +response. The device assures fast and independent protectionagainstload
>> overcurrent,
>> +under/overvoltage and feedback disconnections.
>> +
>> diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
>> index a25faf69fce3..9c846facce9f 100644
>> --- a/drivers/hwmon/pmbus/Kconfig
>> +++ b/drivers/hwmon/pmbus/Kconfig
>> @@ -220,6 +220,15 @@ config SENSORS_MP2975
>>          This driver can also be built as a module. If so, the module will
>>          be called mp2975.
>>
>> +config SENSORS_PM6764TR
>> +    tristate "ST PM6764TR"
>> +    help
>> +      If you say yes here you get hardware monitoring support for ST
>> +      PM6764TR.
>> +
>> +      This driver can also be built as a module. If so, the module will
>> +      be called pm6764tr.
>> +
>>    config SENSORS_PXE1610
>>        tristate "Infineon PXE1610"
>>        help
>> diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
>> index 4c97ad0bd791..31ebdef5d4a6 100644
>> --- a/drivers/hwmon/pmbus/Makefile
>> +++ b/drivers/hwmon/pmbus/Makefile
>> @@ -25,6 +25,7 @@ obj-$(CONFIG_SENSORS_MAX31785)    += max31785.o
>>    obj-$(CONFIG_SENSORS_MAX34440)    += max34440.o
>>    obj-$(CONFIG_SENSORS_MAX8688)    += max8688.o
>>    obj-$(CONFIG_SENSORS_MP2975)    += mp2975.o
>> +obj-$(CONFIG_SENSORS_PM6764TR)    += pm6764tr.o
>>    obj-$(CONFIG_SENSORS_PXE1610)    += pxe1610.o
>>    obj-$(CONFIG_SENSORS_TPS40422)    += tps40422.o
>>    obj-$(CONFIG_SENSORS_TPS53679)    += tps53679.o
>> diff --git a/drivers/hwmon/pmbus/pm6764tr.c b/drivers/hwmon/pmbus/pm6764tr.c
>> new file mode 100644
>> index 000000000000..2ab68036bb0c
>> --- /dev/null
>> +++ b/drivers/hwmon/pmbus/pm6764tr.c
>> @@ -0,0 +1,78 @@
>> +// SPDX-License-Identifier: GPL-2.0+
>> +/*
>> + * Hardware monitoring driver for STMicroelectronics digital controller
>> PM6764TR
>> + */
>> +
>> +#include <linux/err.h>
>> +#include <linux/i2c.h>
>> +#include <linux/init.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/mutex.h>
>> +#include <linux/pmbus.h>
>> +#include <linux/slab.h>
>> +#include "pmbus.h"
>> +
>> +#define PM6764TR_PMBUS_READ_VOUT    0xD4
>> +
>> +static int pm6764tr_read_word_data(struct i2c_client *client, int page,
>> int reg)
>> +{
>> +    int ret;
>> +
>> +    switch (reg) {
>> +    case PMBUS_VIRT_READ_VMON:
>> +        ret = pmbus_read_word_data(client, page, PM6764TR_PMBUS_READ_VOUT);
>> +        break;
>> +    default:
>> +        ret = -ENODATA;
>> +        break;
>> +    }
>> +    return ret;
>> +}
>> +
>> +static struct pmbus_driver_info pm6764tr_info = {
>> +    .pages = 1,
>> +    .format[PSC_VOLTAGE_IN] = linear,
>> +    .format[PSC_VOLTAGE_OUT] = vid,
>> +    .format[PSC_TEMPERATURE] = linear,
>> +    .format[PSC_CURRENT_OUT] = linear,
>> +    .format[PSC_POWER] = linear,
>> +    .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN |  PMBUS_HAVE_PIN |
>> +        PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT | PMBUS_HAVE_VMON |
>> +        PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_VOUT |
>> +        PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
>> +    .read_word_data = pm6764tr_read_word_data,
>> +};
>> +
>> +static int pm6764tr_probe(struct i2c_client *client,
>> +              const struct i2c_device_id *id)
>> +{
>> +    return pmbus_do_probe(client, id, &pm6764tr_info);
>> +}
>> +
>> +static const struct i2c_device_id pm6764tr_id[] = {
>> +    {"pm6764tr", 0},
>> +    {}
>> +};
>> +MODULE_DEVICE_TABLE(i2c, pm6764tr_id);
>> +
>> +static const struct of_device_id pm6764tr_of_match[] = {
>> +    {.compatible = "pm6764tr"},
>> +    {}
>> +};
>> +
>> +/* This is the driver that will be inserted */
>> +static struct i2c_driver pm6764tr_driver = {
>> +    .driver = {
>> +           .name = "pm6764tr",
>> +           .of_match_table = of_match_ptr(pm6764tr_of_match),
>> +           },
>> +    .probe_new = pm6764tr_probe,
>> +    .id_table = pm6764tr_id,
>> +};
>> +
>> +module_i2c_driver(pm6764tr_driver);
>> +
>> +MODULE_AUTHOR("Charles Hsu");


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