netdev - [PATCH net-next] net: pse-pd: tps23881: Fix the device ID check

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Message-ID: <20240730161032.3616000-1-kyle.swenson@est.tech>
Date: Tue, 30 Jul 2024 16:11:08 +0000
From: Kyle Swenson <kyle.swenson@....tech>
To: Kyle Swenson <kyle.swenson@....tech>, "o.rempel@...gutronix.de"
	<o.rempel@...gutronix.de>, "kory.maincent@...tlin.com"
	<kory.maincent@...tlin.com>, "kuba@...nel.org" <kuba@...nel.org>
CC: "davem@...emloft.net" <davem@...emloft.net>, "edumazet@...gle.com"
	<edumazet@...gle.com>, "pabeni@...hat.com" <pabeni@...hat.com>,
	"thomas.petazzoni@...tlin.com" <thomas.petazzoni@...tlin.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH net-next] net: pse-pd: tps23881: Fix the device ID check

The DEVID register contains two pieces of information: the device ID in
the upper nibble, and the silicon revision number in the lower nibble.
The driver should work fine with any silicon revision, so let's mask
that out in the device ID check.

Fixes: 20e6d190ffe1 ("net: pse-pd: Add TI TPS23881 PSE controller driver")
Signed-off-by: Kyle Swenson <kyle.swenson@....tech>
---
 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 61f6ad9c1934..bff8402fb382 100644
--- a/drivers/net/pse-pd/tps23881.c
+++ b/drivers/net/pse-pd/tps23881.c
@@ -748,11 +748,11 @@ static int tps23881_i2c_probe(struct i2c_client *client)
 
 	ret = i2c_smbus_read_byte_data(client, TPS23881_REG_DEVID);
 	if (ret < 0)
 		return ret;
 
-	if (ret != 0x22) {
+	if ((ret & 0xF0) != 0x20) {
 		dev_err(dev, "Wrong device ID\n");
 		return -ENXIO;
 	}
 
 	ret = tps23881_flash_sram_fw(client);
-- 
2.43.0