linux-kernel - Re: [PATCH v2 4/5] hwmon: pmbus: mpq8785: Implement VOUT feedback resistor divider ratio configuration

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Message-ID: <881c4ed3-51a1-4859-8417-6a46a4d7de2c@kernel.org>
Date: Fri, 9 May 2025 09:07:39 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Pawel Dembicki <paweldembicki@...il.com>, linux-hwmon@...r.kernel.org
Cc: Jean Delvare <jdelvare@...e.com>, Guenter Roeck <linux@...ck-us.net>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Jonathan Corbet <corbet@....net>,
 Noah Wang <noahwang.wang@...look.com>, Michal Simek <michal.simek@....com>,
 Naresh Solanki <naresh.solanki@...ements.com>,
 Fabio Estevam <festevam@...il.com>, Grant Peltier
 <grantpeltier93@...il.com>,
 Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Shen Lichuan <shenlichuan@...o.com>, Peter Zijlstra <peterz@...radead.org>,
 Greg KH <gregkh@...uxfoundation.org>, Charles Hsu <ythsu0511@...il.com>,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-doc@...r.kernel.org
Subject: Re: [PATCH v2 4/5] hwmon: pmbus: mpq8785: Implement VOUT feedback
 resistor divider ratio configuration

On 09/05/2025 08:51, Pawel Dembicki wrote:
> Implement support for setting the VOUT_SCALE_LOOP PMBus register
> based on an optional device tree property
> "mps,vout-fb-divider-ratio-permille".
> 
> This allows the driver to provide the correct VOUT value depending
> on the feedback voltage divider configuration for chips where the
> bootloader does not configure the VOUT_SCALE_LOOP register.
> 
> Signed-off-by: Pawel Dembicki <paweldembicki@...il.com>
> 
> ---
> v2:
>   - rename property to mps,vout-fb-divider-ratio-permille
>   - add register value range checking
> ---
>  drivers/hwmon/pmbus/mpq8785.c | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/drivers/hwmon/pmbus/mpq8785.c b/drivers/hwmon/pmbus/mpq8785.c
> index 34245d0d2125..1d0e7ac9daf4 100644
> --- a/drivers/hwmon/pmbus/mpq8785.c
> +++ b/drivers/hwmon/pmbus/mpq8785.c
> @@ -12,6 +12,13 @@
>  
>  enum chips { mpq8785, mpm82504, mpm3695, mpm3695_25 };
>  
> +static u16 voltage_scale_loop_max_val[] = {
> +	GENMASK(10, 0), /* mpq8785 */

Drop comments and index the table with enums instead. It makes clear and
obvious code. Code should be readable and self-documenting instead of
adding comments as an substitute of non-obvious code.

> +	GENMASK(9, 0), /* mpm82504 */
> +	GENMASK(9, 0), /* mpm3695 */
> +	GENMASK(11, 0), /* mpm3695_25 */
> +};
> +
Best regards,
Krzysztof