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Date: Mon, 24 Jul 2023 06:55:43 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Delphine CC Chiu <Delphine_CC_Chiu@...ynn.com>, patrick@...cx.xyz,
Jean Delvare <jdelvare@...e.com>
Cc: Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>, linux-i2c@...r.kernel.org,
linux-hwmon@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] hwmon: pmbus: Add ltc4286 driver
On 7/24/23 03:05, Delphine CC Chiu wrote:
> Add a driver to support ltc4286 chip
>
No change log, no versioning, did not address all feedback,
sent as reply to previous version instead of independently.
I am not going to re-review this patch. Address all feedback
comments, provide change log and patch versions, and do not
send as reply to previous patch series.
Guenter
> Signed-off-by: Delphine CC Chiu <Delphine_CC_Chiu@...ynn.com>
> ---
> drivers/hwmon/pmbus/Kconfig | 9 +++
> drivers/hwmon/pmbus/Makefile | 1 +
> drivers/hwmon/pmbus/ltc4286.c | 147 ++++++++++++++++++++++++++++++++++
> 3 files changed, 157 insertions(+)
> create mode 100644 drivers/hwmon/pmbus/ltc4286.c
>
> diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
> index 270b6336b76d..7cb9cbff587d 100644
> --- a/drivers/hwmon/pmbus/Kconfig
> +++ b/drivers/hwmon/pmbus/Kconfig
> @@ -226,6 +226,15 @@ config SENSORS_LTC3815
>
> This driver can also be built as a module. If so, the module will
> be called ltc3815.
> +config SENSORS_LTC4286
> + bool "Analog Devices LTC4286"
> + help
> + LTC4286 is an integrated solution for hot swap applications that
> + allows a board to be safely inserted and removed from a
> + live backplane.
> + This chip could be used to monitor voltage, current, ...etc.
> + If you say yes here you get hardware monitoring support for Analog
> + Devices LTC4286.
>
> config SENSORS_MAX15301
> tristate "Maxim MAX15301"
> diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
> index 84ee960a6c2d..94e28f6d6a61 100644
> --- a/drivers/hwmon/pmbus/Makefile
> +++ b/drivers/hwmon/pmbus/Makefile
> @@ -24,6 +24,7 @@ obj-$(CONFIG_SENSORS_LM25066) += lm25066.o
> obj-$(CONFIG_SENSORS_LT7182S) += lt7182s.o
> obj-$(CONFIG_SENSORS_LTC2978) += ltc2978.o
> obj-$(CONFIG_SENSORS_LTC3815) += ltc3815.o
> +obj-$(CONFIG_SENSORS_LTC4286) += ltc4286.o
> obj-$(CONFIG_SENSORS_MAX15301) += max15301.o
> obj-$(CONFIG_SENSORS_MAX16064) += max16064.o
> obj-$(CONFIG_SENSORS_MAX16601) += max16601.o
> diff --git a/drivers/hwmon/pmbus/ltc4286.c b/drivers/hwmon/pmbus/ltc4286.c
> new file mode 100644
> index 000000000000..b86bf31cfbae
> --- /dev/null
> +++ b/drivers/hwmon/pmbus/ltc4286.c
> @@ -0,0 +1,147 @@
> +#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"
> +
> +/* LTC4286 register */
> +#define LTC4286_MFR_CONFIG1 0xF2
> +
> +/* LTC4286 configuration */
> +#define VRANGE_SELECT_BIT BIT(1)
> +
> +#define LTC4286_MFR_ID_SIZE 3
> +
> +enum chips { ltc4286, ltc4287 };
> +
> +/*
> + * Initialize the MBR as default settings which is referred to LTC4286 datasheet
> + * (March 22, 2022 version) table 3 page 16
> + */
> +static struct pmbus_driver_info ltc4286_info = {
> + .pages = 1,
> + .format[PSC_VOLTAGE_IN] = direct,
> + .format[PSC_VOLTAGE_OUT] = direct,
> + .format[PSC_CURRENT_OUT] = direct,
> + .format[PSC_POWER] = direct,
> + .format[PSC_TEMPERATURE] = direct,
> + .m[PSC_VOLTAGE_IN] = 32,
> + .b[PSC_VOLTAGE_IN] = 0,
> + .R[PSC_VOLTAGE_IN] = 1,
> + .m[PSC_VOLTAGE_OUT] = 32,
> + .b[PSC_VOLTAGE_OUT] = 0,
> + .R[PSC_VOLTAGE_OUT] = 1,
> + .m[PSC_CURRENT_OUT] = 1024,
> + .b[PSC_CURRENT_OUT] = 0,
> + .R[PSC_CURRENT_OUT] = 3 - 6, /* To support small shunt resistor value */
> + .m[PSC_POWER] = 1,
> + .b[PSC_POWER] = 0,
> + .R[PSC_POWER] = 4 - 6, /* To support small shunt resistor value */
> + .m[PSC_TEMPERATURE] = 1,
> + .b[PSC_TEMPERATURE] = 273,
> + .R[PSC_TEMPERATURE] = 0,
> + .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
> + PMBUS_HAVE_PIN | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_VOUT |
> + PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_TEMP,
> +};
> +
> +static const struct i2c_device_id ltc4286_id[] = { { "ltc4286", ltc4286 },
> + { "ltc4287", ltc4287 },
> + {} };
> +MODULE_DEVICE_TABLE(i2c, ltc4286_id);
> +
> +static int ltc4286_probe(struct i2c_client *client)
> +{
> + int ret;
> + u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
> + struct pmbus_driver_info *info;
> + u32 rsense;
> +
> + ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, block_buffer);
> + if (ret < 0) {
> + dev_err(&client->dev, "failed to read manufacturer id\n");
> + return ret;
> + }
> +
> + /*
> + * Refer to ltc4286 datasheet page 20
> + * the manufacturer id is LTC
> + */
> + if (ret != LTC4286_MFR_ID_SIZE ||
> + strncmp(block_buffer, "LTC", LTC4286_MFR_ID_SIZE)) {
> + return dev_err_probe(&client->dev, err,
> + "failed to read manufacturer id\n");
> + }
> +
> + ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, block_buffer);
> + if (ret < 0) {
> + dev_err(&client->dev, "failed to read manufacturer model\n");
> + return ret;
> + }
> +
> + for (mid = ltc4286_id; mid->name[0]; mid++) {
> + if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
> + break;
> + }
> +
> + ret = of_property_read_u32(client->dev.of_node,
> + "shunt-resistor-micro-ohms", &rsense);
> + if (ret < 0)
> + return ret;
> +
> + if (rsense == 0)
> + return -EINVAL;
> +
> + info = <c4286_info;
> +
> + /* Default of VRANGE_SELECT = 1, 102.4V */
> + if (device_property_read_bool(client->dev, "vrange_select_25p6")) {
> + /* Setup MFR1 CONFIG register bit 1 VRANGE_SELECT */
> + ret = i2c_smbus_read_word_data(client, LTC4286_MFR_CONFIG1);
> + if (ret < 0) {
> + dev_err(&client->dev,
> + "failed to read manufacturer configuration one\n");
> + return ret;
> + }
> +
> + ret &= ~VRANGE_SELECT; /* VRANGE_SELECT = 0, 25.6V */
> + ret = i2c_smbus_write_word_data(client, LTC4286_MFR_CONFIG1,
> + ret);
> + if (ret < 0) {
> + dev_err(&client->dev, "failed to set vrange\n");
> + return ret;
> + }
> +
> + info->m[PSC_VOLTAGE_IN] = 128;
> + info->m[PSC_VOLTAGE_OUT] = 128;
> + info->m[PSC_POWER] = 4 * rsense;
> + } else
> + info->m[PSC_POWER] = rsense;
> +
> + info->m[PSC_CURRENT_OUT] = 1024 * rsense;
> +
> + return pmbus_do_probe(client, info);
> +}
> +
> +static const struct of_device_id ltc4286_of_match[] = {
> + { .compatible = "lltc,ltc4286" },
> + { .compatible = "lltc,ltc4287" },
> + {}
> +};
> +
> +static struct i2c_driver ltc4286_driver = {
> + .driver = {
> + .name = "ltc4286",
> + .of_match_table = ltc4286_of_match,
> + },
> + .probe = ltc4286_probe,
> + .id_table = ltc4286_id,
> +};
> +
> +module_i2c_driver(ltc4286_driver);
> +
> +MODULE_AUTHOR("Delphine CC Chiu <Delphine_CC_Chiu@...ynn.com>");
> +MODULE_DESCRIPTION("PMBUS driver for LTC4286 and compatibles");
> +MODULE_LICENSE("GPL");
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