Commit c79cbde9 authored by Remo Senekowitsch's avatar Remo Senekowitsch Committed by Danilo Krummrich
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samples: rust: platform: Add property child and reference args examples 



Add some example usage of the device property methods for reading
DT/ACPI/swnode child nodes and reference args.

Signed-off-by: default avatarRemo Senekowitsch <remo@buenzli.dev>
Link: https://lore.kernel.org/r/20250616154511.1862909-4-remo@buenzli.dev


[ Convert 'child@{0,1}' to 'child-{0,1}'; skip child nodes without
  'compatible' property in of_unittest_platform_populate() as proposed
  by Rob Herring. - Danilo]
Signed-off-by: default avatarDanilo Krummrich <dakr@kernel.org>
parent c3e05bd1

drivers/of/unittest-data/tests-platform.dtsi

+7 −0
Original line number Diff line number Diff line
@@ -40,6 +40,13 @@ test-device@2 { 


				test,u32-prop = <0xdeadbeef>;

				test,i16-array = /bits/ 16 <1 2 (-3) (-4)>;



				ref_child_0: child-0 {

					test,ref-arg = <&ref_child_1 0x20 0x32>;

				};

				ref_child_1: child-1 {

					test,ref-arg = <&ref_child_0 0x10 0x64>;

				};

			};

		};

drivers/of/unittest.c

+2 −0
Original line number Diff line number Diff line
@@ -1856,6 +1856,8 @@ static void __init of_unittest_platform_populate(void) 
	of_platform_populate(np, match, NULL, &test_bus->dev);

	for_each_child_of_node(np, child) {

		for_each_child_of_node(child, grandchild) {

			if (!of_property_present(grandchild, "compatible"))

				continue;

			pdev = of_find_device_by_node(grandchild);

			unittest(pdev,

				 "Could not create device for node '%pOFn'\n",

samples/rust/rust_driver_platform.rs

+12 −1
Original line number Diff line number Diff line
@@ -4,7 +4,11 @@ 


use kernel::{

    c_str,

    device::{self, Core},

    device::{

        self,

        property::{FwNodeReferenceArgs, NArgs},

        Core,

    },

    of, platform,

    prelude::*,

    str::CString,
@@ -91,6 +95,13 @@ fn properties_parse(dev: &device::Device) -> Result { 
        let prop: KVec<i16> = fwnode.property_read_array_vec(name, 4)?.required_by(dev)?;

        dev_info!(dev, "'{name}'='{prop:?}' (KVec)\n");



        for child in fwnode.children() {

            let name = c_str!("test,ref-arg");

            let nargs = NArgs::N(2);

            let prop: FwNodeReferenceArgs = child.property_get_reference_args(name, nargs, 0)?;

            dev_info!(dev, "'{name}'='{prop:?}'\n");

        }



        Ok(())

    }

}