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Message-ID: <41c67246-114d-f458-4ff1-164995639ca0@roeck-us.net>
Date: Thu, 8 Sep 2022 11:20:22 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Duke Du <dukedu83@...il.com>, jdelvare@...e.com, corbet@....net,
linux-hwmon@...r.kernel.org, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: fran.hsu@...ntatw.com, george.hung@...ntatw.com,
charles.hsu@...ntatw.com, duke.du@...ntatw.com
Subject: Re: [PATCH v4] hwmon: Add driver for the TEXAS TPS546D24 Buck
Converter.
On 9/7/22 23:13, Duke Du wrote:
> From: Duke Du <dukedu83@...il.com>
>
> Add the pmbus driver for TEXAS tps546d24 Buck Converter.
> The vout mode of tps546d24 supported relative data format,
> which is not meet for the original driver (pmbus.c).
"which is not supported by the PMBus core"
>
> Signed-off-by: Duke Du <dukedu83@...il.com>
> ---
> Change in v1:
> Initial patchset.
> Change in v2:
> Correct the tps546d24.rst format.
> Change in v3:
> 1. Modify the patch description.
> 2. Put the change log between the dashes and diffstat.
> Change in v4:
> 1. Modify the patch description.
> 2. Clear the bit 7 of PMBUS_VOUT_MODE to change the mode from relative
> to absolute.
> 3. Add the vendor prefix.
> ---
> ---
> Documentation/hwmon/index.rst | 1 +
> Documentation/hwmon/tps546d24.rst | 35 ++++++++++++++++++++++
> MAINTAINERS | 7 +++++
> drivers/hwmon/pmbus/Kconfig | 9 ++++++
> drivers/hwmon/pmbus/Makefile | 1 +
> drivers/hwmon/pmbus/tps546d24.c | 63 +++++++++++++++++++++++++++++++++++++++
> 6 files changed, 116 insertions(+)
> create mode 100644 Documentation/hwmon/tps546d24.rst
> create mode 100644 drivers/hwmon/pmbus/tps546d24.c
>
> diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
> index f7113b0..d3eede4 100644
> --- a/Documentation/hwmon/index.rst
> +++ b/Documentation/hwmon/index.rst
> @@ -205,6 +205,7 @@ Hardware Monitoring Kernel Drivers
> tps23861
> tps40422
> tps53679
> + tps546d24
> twl4030-madc-hwmon
> ucd9000
> ucd9200
> diff --git a/Documentation/hwmon/tps546d24.rst b/Documentation/hwmon/tps546d24.rst
> new file mode 100644
> index 0000000..3061fd8
> --- /dev/null
> +++ b/Documentation/hwmon/tps546d24.rst
> @@ -0,0 +1,35 @@
> +.. SPDX-License-Identifier: GPL-2.0-only
> +
> +Kernel driver tps546d24
> +======================
> +
> +Supported chips:
> +
> + * TI TPS546D24
> +
> + Prefix: 'tps546d24'
> +
> + Addresses scanned: -
> +
> + Datasheet: https://www.ti.com/lit/gpn/tps546d24
> +
> +Author: Duke Du <dukedu83@...il.com>
> +
> +
> +Description
> +-----------
> +
> +The TPS546D24A is a highly integrated, non-isolated DC/DC converter capable
> +of high frequency operation and 40-A current output from a 7-mm x 5-mm
> +package.
> +
> +Two, three, and four TPS546D24A devices can be interconnected
> +to provide up to 160 A on a single output. The device has an option to
> +overdrive the internal 5-V LDO with an external 5-V supply via the VDD5
> +pin to improve efficiency and reduce power dissipation of the converter.
> +
> +
> +Platform data support
> +---------------------
> +
> +The driver supports standard PMBus driver platform data.
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 8a5012b..fa2d4fb 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -20583,6 +20583,13 @@ Q: https://patchwork.kernel.org/project/linux-integrity/list/
> T: git git://git.kernel.org/pub/scm/linux/kernel/git/jarkko/linux-tpmdd.git
> F: drivers/char/tpm/
>
> +TPS546D24 DRIVER
> +M: Duke Du <dukedu83@...il.com>
> +L: linux-hwmon@...r.kernel.org
> +S: Maintained
> +F: Documentation/hwmon/tps546d24.rst
> +F: drivers/hwmon/pmbus/tps546d24.c
> +
> TRACING
> M: Steven Rostedt <rostedt@...dmis.org>
> M: Ingo Molnar <mingo@...hat.com>
> diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
> index 951e4a9..89668af 100644
> --- a/drivers/hwmon/pmbus/Kconfig
> +++ b/drivers/hwmon/pmbus/Kconfig
> @@ -397,6 +397,15 @@ config SENSORS_TPS53679
> This driver can also be built as a module. If so, the module will
> be called tps53679.
>
> +config SENSORS_TPS546D24
> + tristate "TPS546D24"
> + help
> + If you say yes here you get hardware monitoring support for TEXAS
> + TPS546D24.
> +
> + This driver can also be built as a module. If so, the module will
> + be called tps546d24
> +
> config SENSORS_UCD9000
> tristate "TI UCD90120, UCD90124, UCD90160, UCD90320, UCD9090, UCD90910"
> help
> diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
> index e2fe86f..0002dbe 100644
> --- a/drivers/hwmon/pmbus/Makefile
> +++ b/drivers/hwmon/pmbus/Makefile
> @@ -41,6 +41,7 @@ obj-$(CONFIG_SENSORS_Q54SJ108A2) += q54sj108a2.o
> obj-$(CONFIG_SENSORS_STPDDC60) += stpddc60.o
> obj-$(CONFIG_SENSORS_TPS40422) += tps40422.o
> obj-$(CONFIG_SENSORS_TPS53679) += tps53679.o
> +obj-$(CONFIG_SENSORS_TPS546D24) += tps546d24.o
> obj-$(CONFIG_SENSORS_UCD9000) += ucd9000.o
> obj-$(CONFIG_SENSORS_UCD9200) += ucd9200.o
> obj-$(CONFIG_SENSORS_XDPE122) += xdpe12284.o
> diff --git a/drivers/hwmon/pmbus/tps546d24.c b/drivers/hwmon/pmbus/tps546d24.c
> new file mode 100644
> index 0000000..84f3dc9
> --- /dev/null
> +++ b/drivers/hwmon/pmbus/tps546d24.c
> @@ -0,0 +1,63 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Hardware monitoring driver for TEXAS TPS546D24 buck converter
> + */
> +
> +#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"
> +
> +static struct pmbus_driver_info tps546d24_info = {
> + .pages = 1,
> + .format[PSC_VOLTAGE_IN] = linear,
> + .format[PSC_VOLTAGE_OUT] = linear,
> + .format[PSC_TEMPERATURE] = linear,
> + .format[PSC_CURRENT_OUT] = linear,
> + .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN
> + | PMBUS_HAVE_IOUT | PMBUS_HAVE_VOUT
> + | PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_VOUT
> + | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
> +};
> +
> +static int tps546d24_probe(struct i2c_client *client)
> +{
> + int reg;
> +
> + reg = i2c_smbus_read_byte_data(client, PMBUS_VOUT_MODE);
> + if (reg > 0x80)
This does not cover reg == 0x80, and does not handle errors.
I would suggest something like
if (reg < 0)
return reg;
if (reg & 0x80) {
int err;
err = i2c_smbus_write_byte_data(client, PMBUS_VOUT_MODE, reg & 0x7f);
if (err < 0)
return err;
}
return pmbus_do_probe(client, &tps546d24_info);
Thanks,
Guenter
> + i2c_smbus_write_byte_data(client, PMBUS_VOUT_MODE, reg & 0x7f);
> + return pmbus_do_probe(client, &tps546d24_info);
> +}
> +
> +static const struct i2c_device_id tps546d24_id[] = {
> + {"tps546d24", 0},
> + {}
> +};
> +MODULE_DEVICE_TABLE(i2c, tps546d24_id);
> +
> +static const struct of_device_id tps546d24_of_match[] = {
> + {.compatible = "ti,tps546d24"},
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, tps546d24_of_match);
> +
> +/* This is the driver that will be inserted */
> +static struct i2c_driver tps546d24_driver = {
> + .driver = {
> + .name = "tps546d24",
> + .of_match_table = of_match_ptr(tps546d24_of_match),
> + },
> + .probe_new = tps546d24_probe,
> + .id_table = tps546d24_id,
> +};
> +
> +module_i2c_driver(tps546d24_driver);
> +
> +MODULE_AUTHOR("Duke Du <dukedu83@...il.com>");
> +MODULE_DESCRIPTION("PMBus driver for TI tps546d24");
> +MODULE_LICENSE("GPL");
> +MODULE_IMPORT_NS(PMBUS);
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