linux-kernel - Re: [PATCH 2/5] hwmon: pmbus: mpq8785: Add support for MPM82504

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Message-ID: <759682b9-04b0-4e95-ab0b-e4d584ed6361@roeck-us.net>
Date: Tue, 29 Apr 2025 21:07:50 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Pawel Dembicki <paweldembicki@...il.com>, linux-hwmon@...r.kernel.org
Cc: Jean Delvare <jdelvare@...e.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Jonathan Corbet <corbet@....net>,
 Greg KH <gregkh@...uxfoundation.org>, Shen Lichuan <shenlichuan@...o.com>,
 Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
 Peter Zijlstra <peterz@...radead.org>, Charles Hsu <ythsu0511@...il.com>,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-doc@...r.kernel.org
Subject: Re: [PATCH 2/5] hwmon: pmbus: mpq8785: Add support for MPM82504

On 4/28/25 15:13, Pawel Dembicki wrote:
> Add support for the Monolithic Power Systems MPM82504 digital voltage
> regulator. MPM82504 uses PMBus direct format for voltage output.
> 
> Tested with device tree based matching.
> 
> Signed-off-by: Pawel Dembicki <paweldembicki@...il.com>
> ---
>   Documentation/hwmon/mpq8785.rst | 20 +++++++++++++++-----
>   drivers/hwmon/pmbus/mpq8785.c   | 12 +++++++++++-
>   2 files changed, 26 insertions(+), 6 deletions(-)
> 
> diff --git a/Documentation/hwmon/mpq8785.rst b/Documentation/hwmon/mpq8785.rst
> index bf8176b87086..be228ee58ce2 100644
> --- a/Documentation/hwmon/mpq8785.rst
> +++ b/Documentation/hwmon/mpq8785.rst
> @@ -6,6 +6,7 @@ Kernel driver mpq8785
>   Supported chips:
>   
>     * MPS MPQ8785
> +  * MPS MPM82504
>   
>       Prefix: 'mpq8785'
>   
> @@ -20,21 +21,30 @@ buck converter. The MPQ8785 offers a very compact solution that achieves up to
>   wide input supply range. The MPQ8785 operates at high efficiency over a wide
>   output current load range.
>   
> +The MPM82504 is a quad 25A, scalable, fully integrated power module with a PMBus
> +interface. The device offers a complete power solution that achieves up to 25A
> +per output channel. The MPM82504 has four output channels that can be paralleled
> +to provide 50A, 75A, or 100A of output current for flexible configurations.
> +The device can also operate in parallel with the MPM3695-100 and additional
> +MPM82504 devices to provide a higher output current. The MPM82504 operates
> +at high efficiency across a wide load range.
> +
>   The PMBus interface provides converter configurations and key parameters
>   monitoring.
>   
> -The MPQ8785 adopts MPS's proprietary multi-phase digital constant-on-time (MCOT)
> +The devices adopts MPS's proprietary multi-phase digital constant-on-time (MCOT)
>   control, which provides fast transient response and eases loop stabilization.
> -The MCOT scheme also allows multiple MPQ8785 devices to be connected in parallel
> -with excellent current sharing and phase interleaving for high-current
> +The MCOT scheme also allows multiple devices or chennels to be connected in
> +parallel with excellent current sharing and phase interleaving for high-current
>   applications.
>   
>   Fully integrated protection features include over-current protection (OCP),
>   over-voltage protection (OVP), under-voltage protection (UVP), and
>   over-temperature protection (OTP).
>   
> -The MPQ8785 requires a minimal number of readily available, standard external
> -components, and is available in a TLGA (5mmx6mm) package.
> +All supported modules require a minimal number of readily available, standard
> +external components. The MPQ8785 is available in a TLGA (5mmx6mm) package
> +and the MPM82504 is available in a BGA (15mmx30mmx5.18mm) package.
>   
>   Device compliant with:
>   
> diff --git a/drivers/hwmon/pmbus/mpq8785.c b/drivers/hwmon/pmbus/mpq8785.c
> index 00ec21b081cb..7ee201550554 100644
> --- a/drivers/hwmon/pmbus/mpq8785.c
> +++ b/drivers/hwmon/pmbus/mpq8785.c
> @@ -8,7 +8,7 @@
>   #include <linux/of_device.h>
>   #include "pmbus.h"
>   
> -enum chips { mpq8785 };
> +enum chips { mpq8785, mpm82504 };
>   
>   static int mpq8785_identify(struct i2c_client *client,
>   			    struct pmbus_driver_info *info)
> @@ -59,12 +59,14 @@ static struct pmbus_driver_info mpq8785_info = {
>   
>   static const struct i2c_device_id mpq8785_id[] = {
>   	{ "mpq8785", mpq8785 },
> +	{ "mpm82504", mpm82504 },
>   	{ },
>   };
>   MODULE_DEVICE_TABLE(i2c, mpq8785_id);
>   
>   static const struct of_device_id __maybe_unused mpq8785_of_match[] = {
>   	{ .compatible = "mps,mpq8785", .data = (void *)mpq8785 },
> +	{ .compatible = "mps,mpm82504", .data = (void *)mpm82504 },
>   	{}
>   };
>   MODULE_DEVICE_TABLE(of, mpq8785_of_match);
> @@ -87,6 +89,14 @@ static int mpq8785_probe(struct i2c_client *client)
>   	switch (chip_id) {
>   	case mpq8785:
>   		info->identify = mpq8785_identify;
> +
Please drop this extra empty line.

> +		break;
> +	case mpm82504:
> +		info->format[PSC_VOLTAGE_OUT] = direct;
> +		info->m[PSC_VOLTAGE_OUT] = 8;
> +		info->b[PSC_VOLTAGE_OUT] = 0;
> +		info->R[PSC_VOLTAGE_OUT] = 2;
> +
Same here.

>   		break;
>   	default:
>   		return -ENODEV;