[PATCH net] net: pse-pd: tps23881: Fix current measurement scaling

From: Thomas Wismer <redacted>

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.

Fixes: 7f076ce3f1733 ("net: pse-pd: tps23881: Add support for power limit and measurement features")
Signed-off-by: Thomas Wismer <redacted>
---
 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

On Mon,  6 Oct 2025 22:40:29 +0200
Thomas Wismer [off-list ref] wrote:

From: Thomas Wismer <redacted>

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.

Fixes: 7f076ce3f1733 ("net: pse-pd: tps23881: Add support for power limit and
measurement features") Signed-off-by: Thomas Wismer [off-list ref]

Acked-by: Kory Maincent <kory.maincent@bootlin.com>

Thank you!
-- 
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Embedded Linux and kernel engineering
https://bootlin.com

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski [off-list ref]:

On Mon,  6 Oct 2025 22:40:29 +0200 you wrote:

From: Thomas Wismer <redacted>

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.

[...]

Here is the summary with links:
  - [net] net: pse-pd: tps23881: Fix current measurement scaling
    https://git.kernel.org/netdev/net/c/2c95a756e0cf

You are awesome, thank you!
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