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Date: Mon, 30 Nov 2020 15:46:19 +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 v5] hwmon: Add driver for STMicroelectronics PM6764
Voltage Regulator
On 28/11/2020 上午12:10, Guenter Roeck wrote:
> On Fri, Nov 27, 2020 at 09:59:01AM +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>
> This patch (again) didn't make it to any of the mailing lists.
> Please try to find out why this is the case. I usually pick up
> patches from https://patchwork.kernel.org/project/linux-hwmon/list/,
> and may easily miss a patch if I can't find it there.
>
>> ---
>>
>> v5:
>> - Add MAINTAINERS
>> - Add a reference into trivial-devices.yaml
>> 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.
>>
>> ---
>>
>> .../devicetree/bindings/trivial-devices.yaml | 2 +
>> Documentation/hwmon/index.rst | 1 +
>> Documentation/hwmon/pm6764tr.rst | 33 ++++++++
>> MAINTAINERS | 7 ++
>> drivers/hwmon/pmbus/Kconfig | 9 +++
>> drivers/hwmon/pmbus/Makefile | 1 +
>> drivers/hwmon/pmbus/pm6764tr.c | 76 +++++++++++++++++++
>> 7 files changed, 129 insertions(+)
>> create mode 100644 Documentation/hwmon/pm6764tr.rst
>> create mode 100644 drivers/hwmon/pmbus/pm6764tr.c
>>
>> diff --git a/Documentation/devicetree/bindings/trivial-devices.yaml b/Documentation/devicetree/bindings/trivial-devices.yaml
>> index ab623ba930d5..cdd7bdb6abbb 100644
>> --- a/Documentation/devicetree/bindings/trivial-devices.yaml
>> +++ b/Documentation/devicetree/bindings/trivial-devices.yaml
>> @@ -348,6 +348,8 @@ properties:
>> - socionext,synquacer-tpm-mmio
>> # i2c serial eeprom (24cxx)
>> - st,24c256
>> + # SMBus/I2C Voltage Regulator
>> + - st,pm6764tr
>> # Ambient Light Sensor with SMBUS/Two Wire Serial Interface
>> - taos,tsl2550
>> # 8-Channels, 12-bit ADC
> This, like all devicetre changes, needs to be a separate patch.
> Also, please make sure to copy dt maintainers and the dt mailing list
> when you send that patch.
Thank you for your suggestions.
I will send that patch as soon as possible.
>> 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.
>> +
> Unrelated side note: I understand this means that you are forced to keep the
> datasheet under wraps, which in turn means I can not suggest functionality
> improvements since I don't have access to it. If the chip happens to support
> per-rail telemetry, you might want to consider adding support for that in a
> follow-up patch.
>
>> +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,
> "protectionagainstload" -> "protection against load"
>
>> +under/overvoltage and feedback disconnections.
>> +
> Drop empty line at end.
>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 94ac10a153c7..a3fea132c4ed 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -13904,6 +13904,13 @@ M: Logan Gunthorpe <logang@...tatee.com>
>> S: Maintained
>> F: drivers/dma/plx_dma.c
> Add empty line.
There is an empty line here,
Should I add one more empty line?
>> +PM6764TR DRIVER
>> +M: Charles Hsu <hsu.yungteng@...il.com>
>> +L: linux-hwmon@...r.kernel.org
>> +S: Maintained
>> +F: Documentation/hwmon/pm6764tr.rst
>> +F: drivers/hwmon/pmbus/pm6764tr.c
>> +
>> PM-GRAPH UTILITY
>> M: "Todd E Brandt" <todd.e.brandt@...ux.intel.com>
>> L: linux-pm@...r.kernel.org
>> 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.
> Add empty line.
Same as above.
>> +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..70747c21c66e
>> --- /dev/null
>> +++ b/drivers/hwmon/pmbus/pm6764tr.c
>> @@ -0,0 +1,76 @@
>> +// 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/pmbus.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 = "st,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");
>> +MODULE_DESCRIPTION("PMBus driver for ST PM6764TR");
>> +MODULE_LICENSE("GPL");
>> --
>> 2.25.1
>>
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