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

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Message-ID: <20251004180351.118779-4-thomas@wismer.xyz>
Date: Sat,  4 Oct 2025 20:03:49 +0200
From: Thomas Wismer <thomas@...mer.xyz>
To: Oleksij Rempel <o.rempel@...gutronix.de>,
	Kory Maincent <kory.maincent@...tlin.com>,
	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>
Cc: Thomas Wismer <thomas.wismer@....ch>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] net: pse-pd: tps23881: Fix current measurement scaling

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.

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
 
-- 
2.43.0