From patchwork Wed Mar 26 17:13:49 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Remo Senekowitsch X-Patchwork-Id: 14030378 Received: from mout-p-201.mailbox.org (mout-p-201.mailbox.org [80.241.56.171]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6D4AA1F872C; Wed, 26 Mar 2025 17:15:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=80.241.56.171 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743009323; cv=none; b=ainOMWoDTCg0v7+6PYSjXCgxIu8yIzkGTQFuEWdkCOIZWKesMyDqWeeoUIXpQDPmSW0X6bYRTH0nnLIXzJCEQb64tfopWrGLkfrX0MlGmLU5/Mf9X6ebytgevXbzsNCLxRpOyx6IO0fuwx4ixuLpnoOac6RZ+geFHf05NFlihNU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743009323; c=relaxed/simple; bh=GMrrzdfst3UrCx5Hw9DPHzzI0KYSCppNF/wVPqqk5rY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VLcNQkda8C7a7roh0gQArmEUP899stN1Og7KCENFQgoQ8fl7A9yY3ssibhfqkWwzfRGHUWW1a4dHSyTcVhg20ra7jE88HWLA+bzkBDZs3RR6kwGpxosOJ4a52Rxvhj78y+OMoRNmugb0VNOXHlPOWqN1vmG1tIC28dxd2yN9zzA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=buenzli.dev; spf=pass smtp.mailfrom=buenzli.dev; arc=none smtp.client-ip=80.241.56.171 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=buenzli.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=buenzli.dev Received: from smtp2.mailbox.org (smtp2.mailbox.org [IPv6:2001:67c:2050:b231:465::2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mout-p-201.mailbox.org (Postfix) with ESMTPS id 4ZND1x5lL5z9sq9; Wed, 26 Mar 2025 18:15:17 +0100 (CET) From: Remo Senekowitsch To: Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Rob Herring Cc: Dirk Behme , Greg Kroah-Hartman , "Rafael J. Wysocki" , Danilo Krummrich , Saravana Kannan , Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Remo Senekowitsch , linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, devicetree@vger.kernel.org, rust-for-linux@vger.kernel.org Subject: [PATCH 10/10] samples: rust: platform: Add property read examples Date: Wed, 26 Mar 2025 18:13:49 +0100 Message-ID: <20250326171411.590681-11-remo@buenzli.dev> In-Reply-To: <20250326171411.590681-1-remo@buenzli.dev> References: <20250326171411.590681-1-remo@buenzli.dev> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Rspamd-Queue-Id: 4ZND1x5lL5z9sq9 Add some example usage of the device property read methods for DT/ACPI/swnode properties. Co-developed-by: Rob Herring (Arm) Signed-off-by: Rob Herring (Arm) Signed-off-by: Remo Senekowitsch --- drivers/of/unittest-data/tests-platform.dtsi | 3 ++ samples/rust/rust_driver_platform.rs | 56 +++++++++++++++++++- 2 files changed, 58 insertions(+), 1 deletion(-) diff --git a/drivers/of/unittest-data/tests-platform.dtsi b/drivers/of/unittest-data/tests-platform.dtsi index 4171f43cf..50a51f38a 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 8120609e2..ed25a3781 100644 --- a/samples/rust/rust_driver_platform.rs +++ b/samples/rust/rust_driver_platform.rs @@ -2,7 +2,7 @@ //! Rust Platform driver sample. -use kernel::{c_str, of, platform, prelude::*}; +use kernel::{c_str, of, platform, prelude::*, str::CString}; struct SampleDriver { pdev: platform::Device, @@ -28,6 +28,60 @@ fn probe(pdev: &mut platform::Device, info: Option<&Self::IdInfo>) -> Result(c_str!("compatible")) + .required() + { + dev_info!(pdev.as_ref(), "compatible string = {:?}\n", str); + } + + let prop = dev + .property_read::(c_str!("test,bool-prop")) + .required()?; + dev_info!(dev, "bool prop is {}\n", prop); + + if dev.property_present(c_str!("test,u32-prop")) { + dev_info!(dev, "'test,u32-prop' is present\n"); + } + + let prop = dev + .property_read::(c_str!("test,u32-optional-prop")) + .or(0x12); + dev_info!( + dev, + "'test,u32-optional-prop' is {:#x} (default = {:#x})\n", + prop, + 0x12 + ); + + // Missing property without a default will print an error + let _ = dev + .property_read::(c_str!("test,u32-required-prop")) + .required()?; + + let prop: u32 = dev.property_read(c_str!("test,u32-prop")).required()?; + dev_info!(dev, "'test,u32-prop' is {:#x}\n", prop); + + let prop: [i16; 4] = dev.property_read(c_str!("test,i16-array")).required()?; + dev_info!(dev, "'test,i16-array' is {:?}\n", prop); + dev_info!( + dev, + "'test,i16-array' length is {}\n", + dev.property_count_elem::(c_str!("test,i16-array")) + .unwrap() + ); + + let prop: KVec = dev + .property_read_array_vec(c_str!("test,i16-array"), 4)? + .required()?; + dev_info!(dev, "'test,i16-array' is KVec {:?}\n", prop); + let drvdata = KBox::new(Self { pdev: pdev.clone() }, GFP_KERNEL)?; Ok(drvdata.into())