linux-kernel - [PATCH DNM 2/2] interconnect: Add a test Rust consumer driver

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Message-Id: <20250722-topic-icc_rs-v1-2-9da731c14603@oss.qualcomm.com>
Date: Tue, 22 Jul 2025 23:14:26 +0200
From: Konrad Dybcio <konradybcio@...nel.org>
To: 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 <lossin@...nel.org>, Andreas Hindborg <a.hindborg@...nel.org>, 
 Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>, 
 Danilo Krummrich <dakr@...nel.org>, Georgi Djakov <djakov@...nel.org>, 
 Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>, 
 Bjorn Andersson <bjorn.andersson@....qualcomm.com>
Cc: Marijn Suijten <marijn.suijten@...ainline.org>, 
 linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org, 
 linux-pm@...r.kernel.org, Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: [PATCH DNM 2/2] interconnect: Add a test Rust consumer driver

From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

Do not merge, this is for illustration / CI purposes only.

Signed-off-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
---
 drivers/interconnect/Makefile |  1 +
 drivers/interconnect/test.rs  | 47 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 48 insertions(+)

diff --git a/drivers/interconnect/Makefile b/drivers/interconnect/Makefile
index b0a9a6753b9dc30083781163ccc01dafcfcd0485..913b92080cc0b79846b74c239e14959b45b5450c 100644
--- a/drivers/interconnect/Makefile
+++ b/drivers/interconnect/Makefile
@@ -2,6 +2,7 @@
 
 CFLAGS_core.o				:= -I$(src)
 icc-core-objs				:= core.o bulk.o debugfs-client.o
+icc-core-$(CONFIG_RUST)			+= test.o
 
 obj-$(CONFIG_INTERCONNECT)		+= icc-core.o
 obj-$(CONFIG_INTERCONNECT_IMX)		+= imx/
diff --git a/drivers/interconnect/test.rs b/drivers/interconnect/test.rs
new file mode 100644
index 0000000000000000000000000000000000000000..f4ba2000d0f1fd2d91aedf8aace0b0b54bfd48f2
--- /dev/null
+++ b/drivers/interconnect/test.rs
@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
+
+//! Test interconnect consumer driver
+use kernel::{
+    c_str, device::Core, icc::*, module_platform_driver, of, of::DeviceId, platform, prelude::*,
+};
+
+#[pin_data]
+struct IccTestConsumerDriver {
+    #[pin]
+    path: IccPath,
+}
+
+kernel::of_device_table!(
+    OF_TABLE,
+    MODULE_OF_TABLE,
+    <IccTestConsumerDriver as platform::Driver>::IdInfo,
+    [(DeviceId::new(c_str!("linux,icc-consumer-test")), ())]
+);
+
+impl platform::Driver for IccTestConsumerDriver {
+    type IdInfo = ();
+    const OF_ID_TABLE: Option<of::IdTable<Self::IdInfo>> = Some(&OF_TABLE);
+
+    fn probe(
+        pdev: &platform::Device<Core>,
+        _id_info: Option<&Self::IdInfo>,
+    ) -> Result<Pin<KBox<Self>>> {
+        let path = IccPath::of_get(pdev.as_ref(), None)?;
+
+        path.set_bw(
+            IccBwUnit::from_megabits_per_sec(400),
+            IccBwUnit::from_megabits_per_sec(800),
+        )?;
+
+        Ok(KBox::pin_init(Self { path }, GFP_KERNEL)?.into())
+    }
+}
+
+module_platform_driver! {
+    type: IccTestConsumerDriver,
+    name: "icc-test-consumer",
+    authors: ["Konrad Dybcio <konrad.dybcio@....qualcomm.com>"],
+    description: "Test interconnect consumer driver",
+    license: "GPL",
+}

-- 
2.50.1