linux-kernel - [PATCH RFC 3/3] samples: rust: platform: Add property read examples

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Message-Id: <20241025-rust-platform-dev-v1-3-0df8dcf7c20b@kernel.org>
Date: Fri, 25 Oct 2024 16:05:48 -0500
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Saravana Kannan <saravanak@...gle.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, Miguel Ojeda <ojeda@...nel.org>, 
 Alex Gaynor <alex.gaynor@...il.com>, Boqun Feng <boqun.feng@...il.com>, 
 Gary Guo <gary@...yguo.net>, 
 Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
 Benno Lossin <benno.lossin@...ton.me>, 
 Andreas Hindborg <a.hindborg@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, 
 Trevor Gross <tmgross@...ch.edu>, Danilo Krummrich <dakr@...nel.org>, 
 Dirk Behme <dirk.behme@...il.com>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 rust-for-linux@...r.kernel.org
Subject: [PATCH RFC 3/3] samples: rust: platform: Add property read
 examples

Add some example usage of the device property read methods for
DT/ACPI/swnode properties.

Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
---
 drivers/of/unittest-data/tests-platform.dtsi |  3 +++
 samples/rust/rust_driver_platform.rs         | 22 ++++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/drivers/of/unittest-data/tests-platform.dtsi b/drivers/of/unittest-data/tests-platform.dtsi
index 2caaf1c10ee6..a5369b9343b8 100644
--- a/drivers/of/unittest-data/tests-platform.dtsi
+++ b/drivers/of/unittest-data/tests-platform.dtsi
@@ -37,6 +37,9 @@ dev@100 {
 			test-device@2 {
 				compatible = "test,rust-device";
 				reg = <0x2>;
+
+				test,u32-prop = <0xdeadbeef>;
+				test,i16-array = /bits/ 16 <1 2 (-3) (-4)>;
 			};
 		};
 	};
diff --git a/samples/rust/rust_driver_platform.rs b/samples/rust/rust_driver_platform.rs
index 5cf4a8f86c13..95c290806862 100644
--- a/samples/rust/rust_driver_platform.rs
+++ b/samples/rust/rust_driver_platform.rs
@@ -41,6 +41,28 @@ fn probe(pdev: &mut platform::Device, info: Option<&Self::IdInfo>) -> Result<Pin
             }
         };

+        let dev = pdev.as_ref();
+        if let Ok(idx) = dev.property_match_string(c_str!("compatible"), c_str!("test,rust-device"))
+        {
+            dev_info!(pdev.as_ref(), "matched compatible string idx = {}\n", idx);
+        }
+
+        let prop = dev.property_read_bool(c_str!("test,bool-prop"));
+        dev_info!(dev, "bool prop is {}\n", prop);
+
+        let _prop = dev.property_read::<u32>(c_str!("test,u32-prop"))?;
+        let prop: u32 = dev.property_read(c_str!("test,u32-prop"))?;
+        dev_info!(dev, "'test,u32-prop' is {:#x}\n", prop);
+
+        let prop: [i16; 4] = dev.property_read_array(c_str!("test,i16-array"))?;
+        dev_info!(dev, "'test,i16-array' is {:?}\n", prop);
+        dev_info!(
+            dev,
+            "'test,i16-array' length is {}\n",
+            dev.property_count_elem::<u16>(c_str!("test,i16-array"))
+                .unwrap()
+        );
+
         let drvdata = KBox::new(Self { pdev: pdev.clone() }, GFP_KERNEL)?;

         Ok(drvdata.into())

-- 
2.45.2