netdev - Re: [PATCH 1/3] net: pse-pd: tps23881: Fix current measurement scaling

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Message-ID: <20251006144911.702fed49@kmaincent-XPS-13-7390>
Date: Mon, 6 Oct 2025 14:50:29 +0200
From: Kory Maincent <kory.maincent@...tlin.com>
To: Thomas Wismer <thomas@...mer.xyz>
Cc: Oleksij Rempel <o.rempel@...gutronix.de>, Andrew Lunn
 <andrew+netdev@...n.ch>, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo
 Abeni <pabeni@...hat.com>, Thomas Wismer <thomas.wismer@....ch>,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] net: pse-pd: tps23881: Fix current measurement
 scaling

On Sat,  4 Oct 2025 20:03:49 +0200
Thomas Wismer <thomas@...mer.xyz> wrote:

> From: Thomas Wismer <thomas.wismer@....ch>
> 
> The TPS23881 improves on the TPS23880 with current sense resistors reduced
> from 255 mOhm to 200 mOhm. This has a direct impact on the scaling of the
> current measurement. However, the latest TPS23881 data sheet from May 2023
> still shows the scaling of the TPS23880 model.

Didn't know that. Where did you get that new current step value if it's not
from the datasheet?

Also as the value reported was wrong maybe we need a fix tag here and send it
to net instead of net-next.

> Signed-off-by: Thomas Wismer <thomas.wismer@....ch>
> ---
>  drivers/net/pse-pd/tps23881.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/pse-pd/tps23881.c b/drivers/net/pse-pd/tps23881.c
> index 63f8f43062bc..b724b222ab44 100644
> --- a/drivers/net/pse-pd/tps23881.c
> +++ b/drivers/net/pse-pd/tps23881.c
> @@ -62,7 +62,7 @@
>  #define TPS23881_REG_SRAM_DATA	0x61
>  
>  #define TPS23881_UV_STEP	3662
> -#define TPS23881_NA_STEP	70190
> +#define TPS23881_NA_STEP	89500
>  #define TPS23881_MW_STEP	500
>  #define TPS23881_MIN_PI_PW_LIMIT_MW	2000
>  

-- 
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com