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@xxxxxxxxxxxxxxxxxxxx> Reviewed-by: Andi Shyti <andi.shyti@xxxxxxxxxx> --- Changes since v1: * added docs * added tags (Thanks, Andi!) Documentation/i2c/slave-testunit-backend.rst | 5 +++++ drivers/i2c/i2c-core-base.c | 2 ++ 2 files changed, 7 insertions(+) diff --git a/Documentation/i2c/slave-testunit-backend.rst b/Documentation/i2c/slave-testunit-backend.rst index 0df60c7c0be4..37142a48ab35 100644 --- a/Documentation/i2c/slave-testunit-backend.rst +++ b/Documentation/i2c/slave-testunit-backend.rst @@ -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 ~~~~~~~~~~~~~~~~~~~~~~~~~~ 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
