linux-kernel - [PATCH] i2c: add debug message for detected HostNotify alerts

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Date: Thu, 27 Jun 2024 14:43:14 +0200
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
To: linux-renesas-soc@...r.kernel.org
Cc: Wolfram Sang <wsa+renesas@...g-engineering.com>,
	linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] i2c: add debug message for detected HostNotify alerts

Setting up HostNotify can be tricky. Support debugging by stating
whenever we received a HostNotify alert independent of the irq being
mapped. Especially useful with the in-kernel i2c testunit.

Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
---
 drivers/i2c/i2c-core-base.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index db0d1ac82910..b94594e90a66 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -1468,6 +1468,8 @@ int i2c_handle_smbus_host_notify(struct i2c_adapter *adap, unsigned short addr)
 	if (!adap)
 		return -EINVAL;
 
+	dev_dbg(&adap->dev, "Detected HostNotify from address 0x%02x", addr);
+
 	irq = irq_find_mapping(adap->host_notify_domain, addr);
 	if (irq <= 0)
 		return -ENXIO;
-- 
2.43.0