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Date: Thu, 18 Mar 2021 16:04:41 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Erik Rosen <erik.rosen@...ormote.com>,
Jean Delvare <jdelvare@...e.com>,
Jonathan Corbet <corbet@....net>,
Rob Herring <robh+dt@...nel.org>, linux-hwmon@...r.kernel.org,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org
Subject: Re: [PATCH 2/2] hwmon: (pmbus/tps53679) Add support for TPS53676
On 3/18/21 2:24 PM, Erik Rosen wrote:
> Add support for TI TPS53676 controller to the tps53679 pmbus driver
>
> The driver uses the USER_DATA_03 register to figure out how many phases are
> enabled and to which channel they are assigned, and sets the number of pages
checkpatch complains about the line length here. Picky, but just move pages
to the next line.
> and phases accordingly.
>
> Signed-off-by: Erik Rosen <erik.rosen@...ormote.com>
> ---
> Documentation/hwmon/tps53679.rst | 13 +++++++--
> drivers/hwmon/pmbus/Kconfig | 4 +--
> drivers/hwmon/pmbus/tps53679.c | 49 +++++++++++++++++++++++++++++++-
> 3 files changed, 61 insertions(+), 5 deletions(-)
>
> diff --git a/Documentation/hwmon/tps53679.rst b/Documentation/hwmon/tps53679.rst
> index c7c589e49789..3b9561648c24 100644
> --- a/Documentation/hwmon/tps53679.rst
> +++ b/Documentation/hwmon/tps53679.rst
> @@ -19,6 +19,14 @@ Supported chips:
>
> Datasheet: https://www.ti.com/lit/gpn/TPS53667
>
> + * Texas Instruments TPS53676
> +
> + Prefix: 'tps53676'
> +
> + Addresses scanned: -
> +
> + Datasheet: https://www.ti.com/lit/gpn/TPS53676
> +
> * Texas Instruments TPS53679
>
> Prefix: 'tps53679'
> @@ -136,7 +144,7 @@ power1_input Measured input power.
> power[N]_label "pout[1-2]".
>
> - TPS53647, TPS53667: N=2
> - - TPS53679, TPS53681, TPS53588: N=2,3
> + - TPS53676, TPS53679, TPS53681, TPS53588: N=2,3
>
> power[N]_input Measured output power.
>
> @@ -156,10 +164,11 @@ curr[N]_label "iout[1-2]" or "iout1.[0-5]".
>
> The first digit is the output channel, the second
> digit is the phase within the channel. Per-phase
> - telemetry supported on TPS53681 only.
> + telemetry supported on TPS53676 and TPS53681 only.
>
> - TPS53647, TPS53667: N=2
> - TPS53679, TPS53588: N=2,3
> + - TPS53676: N=2-8
> - TPS53681: N=2-9
>
> curr[N]_input Measured output current.
> diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
> index 32d2fc850621..35956a9227d8 100644
> --- a/drivers/hwmon/pmbus/Kconfig
> +++ b/drivers/hwmon/pmbus/Kconfig
> @@ -257,10 +257,10 @@ config SENSORS_TPS40422
> be called tps40422.
>
> config SENSORS_TPS53679
> - tristate "TI TPS53647, TPS53667, TPS53679, TPS53681, TPS53688"
> + tristate "TI TPS53647, TPS53667, TPS53676, TPS53679, TPS53681, TPS53688"
> help
> If you say yes here you get hardware monitoring support for TI
> - TPS53647, TPS53667, TPS53679, TPS53681, and TPS53688.
> + TPS53647, TPS53667, TPS53676, TPS53679, TPS53681, and TPS53688.
>
> This driver can also be built as a module. If so, the module will
> be called tps53679.
> diff --git a/drivers/hwmon/pmbus/tps53679.c b/drivers/hwmon/pmbus/tps53679.c
> index ba838fa311c3..d8e5f71ff162 100644
> --- a/drivers/hwmon/pmbus/tps53679.c
> +++ b/drivers/hwmon/pmbus/tps53679.c
> @@ -16,11 +16,14 @@
> #include "pmbus.h"
>
> enum chips {
> - tps53647, tps53667, tps53679, tps53681, tps53688
> + tps53647, tps53667, tps53676, tps53679, tps53681, tps53688
> };
>
> #define TPS53647_PAGE_NUM 1
>
> +#define TPS53676_USER_DATA_03 0xb3
> +#define TPS53676_MAX_PHASES 7
> +
> #define TPS53679_PROT_VR12_5MV 0x01 /* VR12.0 mode, 5-mV DAC */
> #define TPS53679_PROT_VR12_5_10MV 0x02 /* VR12.5 mode, 10-mV DAC */
> #define TPS53679_PROT_VR13_10MV 0x04 /* VR13.0 mode, 10-mV DAC */
> @@ -143,6 +146,43 @@ static int tps53681_identify(struct i2c_client *client,
> TPS53681_DEVICE_ID);
> }
>
> +static int tps53676_identify(struct i2c_client *client,
> + struct pmbus_driver_info *info)
> +{
> + u8 buf[I2C_SMBUS_BLOCK_MAX];
> + int phases_a = 0, phases_b = 0;
> + int i, ret;
> +
> + ret = i2c_smbus_read_block_data(client, PMBUS_IC_DEVICE_ID, buf);
> + if (ret < 0)
> + return ret;
> + if (strncmp("TI\x53\x67\x60", buf, 5)) {
Someone should have a serious talk with the chip designer.
> + dev_err(&client->dev, "Unexpected device ID: %s\n", buf);
> + return -ENODEV;
> + }
> +
> + ret = i2c_smbus_read_block_data(client, TPS53676_USER_DATA_03, buf);
> + if (ret < 0)
> + return ret;
You'll probably want to add a check to ensure that ret >= TPS53676_MAX_PHASES * 2 + 1
or maybe == 24.
> + for (i = 0; i < 2 * TPS53676_MAX_PHASES; i += 2) {
> + if (buf[i + 1] & 0x80) {
> + if (buf[i] & 0x08)
> + phases_b++;
> + else
> + phases_a++;
> + }
> + }
> +
> + info->format[PSC_VOLTAGE_OUT] = linear;
> + info->pages = 1;
> + info->phases[0] = phases_a;
> + if (phases_b > 0) {
> + info->pages = 2;
> + info->phases[1] = phases_b;
> + }
> + return 0;
> +}
> +
> static int tps53681_read_word_data(struct i2c_client *client, int page,
> int phase, int reg)
> {
> @@ -183,6 +223,7 @@ static struct pmbus_driver_info tps53679_info = {
> .pfunc[3] = PMBUS_HAVE_IOUT,
> .pfunc[4] = PMBUS_HAVE_IOUT,
> .pfunc[5] = PMBUS_HAVE_IOUT,
> + .pfunc[6] = PMBUS_HAVE_IOUT,
> };
>
> static int tps53679_probe(struct i2c_client *client)
> @@ -206,6 +247,9 @@ static int tps53679_probe(struct i2c_client *client)
> info->pages = TPS53647_PAGE_NUM;
> info->identify = tps53679_identify;
> break;
> + case tps53676:
> + info->identify = tps53676_identify;
> + break;
> case tps53679:
> case tps53688:
> info->pages = TPS53679_PAGE_NUM;
> @@ -227,9 +271,11 @@ static int tps53679_probe(struct i2c_client *client)
> static const struct i2c_device_id tps53679_id[] = {
> {"tps53647", tps53647},
> {"tps53667", tps53667},
> + {"tps53676", tps53676},
> {"tps53679", tps53679},
> {"tps53681", tps53681},
> {"tps53688", tps53688},
> + {"bmr474", tps53676},
Please move to the top for alphabetic order.
> {}
> };
>
> @@ -238,6 +284,7 @@ MODULE_DEVICE_TABLE(i2c, tps53679_id);
> static const struct of_device_id __maybe_unused tps53679_of_match[] = {
> {.compatible = "ti,tps53647", .data = (void *)tps53647},
> {.compatible = "ti,tps53667", .data = (void *)tps53667},
> + {.compatible = "ti,tps53676", .data = (void *)tps53676},
> {.compatible = "ti,tps53679", .data = (void *)tps53679},
> {.compatible = "ti,tps53681", .data = (void *)tps53681},
> {.compatible = "ti,tps53688", .data = (void *)tps53688},
>
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