rust: i2c: make Driver trait lifetime-parameterized

Add a 'bound lifetime to the associated Data, changing type Data to type
Data<'bound>.

This allows the driver's bus device private data to capture the device /
driver bound lifetime; device resources can be stored directly by
reference rather than requiring Devres.

The probe() and unbind() callbacks thus gain a 'bound lifetime parameter
on the methods themselves; avoiding a global lifetime on the trait impl.

Existing drivers set type Data<'bound> = Self, preserving the current
behavior.

Acked-by: Igor Korotin <igor.korotin@linux.dev>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260525202921.124698-17-dakr@kernel.org
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

1 files changed, 7 insertions, 7 deletions

diff --git a/samples/rust/rust_driver_i2c.rs b/samples/rust/rust_driver_i2c.rs
index 171550ea0b6f..ead8263a7d48 100644
--- a/samples/rust/rust_driver_i2c.rs
+++ b/samples/rust/rust_driver_i2c.rs
@@ -35,16 +35,16 @@ kernel::of_device_table! {
 
 impl i2c::Driver for SampleDriver {
     type IdInfo = u32;
-    type Data = Self;
+    type Data<'bound> = Self;
 
     const ACPI_ID_TABLE: Option<acpi::IdTable<Self::IdInfo>> = Some(&ACPI_TABLE);
     const I2C_ID_TABLE: Option<i2c::IdTable<Self::IdInfo>> = Some(&I2C_TABLE);
     const OF_ID_TABLE: Option<of::IdTable<Self::IdInfo>> = Some(&OF_TABLE);
 
-    fn probe(
-        idev: &i2c::I2cClient<Core<'_>>,
-        info: Option<&Self::IdInfo>,
-    ) -> impl PinInit<Self, Error> {
+    fn probe<'bound>(
+        idev: &'bound i2c::I2cClient<Core<'_>>,
+        info: Option<&'bound Self::IdInfo>,
+    ) -> impl PinInit<Self, Error> + 'bound {
         let dev = idev.as_ref();
 
         dev_info!(dev, "Probe Rust I2C driver sample.\n");
@@ -56,11 +56,11 @@ impl i2c::Driver for SampleDriver {
         Ok(Self)
     }
 
-    fn shutdown(idev: &i2c::I2cClient<Core<'_>>, _this: Pin<&Self>) {
+    fn shutdown<'bound>(idev: &'bound i2c::I2cClient<Core<'_>>, _this: Pin<&Self>) {
         dev_info!(idev.as_ref(), "Shutdown Rust I2C driver sample.\n");
     }
 
-    fn unbind(idev: &i2c::I2cClient<Core<'_>>, _this: Pin<&Self>) {
+    fn unbind<'bound>(idev: &'bound i2c::I2cClient<Core<'_>>, _this: Pin<&Self>) {
         dev_info!(idev.as_ref(), "Unbind Rust I2C driver sample.\n");
     }
 }