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i2c: add debug message for detected HostNotify alerts

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Setting up HostNotify can be tricky. Support debugging by stating
when a HostNotify alert was received independent of the irq being
mapped. Especially useful with the in-kernel i2c testunit. Update
documentation as well.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
This commit is contained in:
Wolfram Sang 2024-07-04 05:28:59 +02:00
parent 711703013e
commit 500c20fe3e
2 changed files with 7 additions and 0 deletions
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5
Documentation/i2c/slave-testunit-backend.rst
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@ -99,6 +99,11 @@ Example to send a notification after 10ms::
# i2cset -y 0 0x30 0x02 0x42 0x64 0x01 i
If the host controller supports HostNotify, this message with debug level
should appear (Linux 6.11 and later)::
Detected HostNotify from address 0x30
0x03 SMBUS_BLOCK_PROC_CALL
~~~~~~~~~~~~~~~~~~~~~~~~~~

2
drivers/i2c/i2c-core-base.c
View File

@ -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;