linux-kernel - [PATCH] rpmsg: Make modalias work for DeviceTree based devices

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Message-Id: <20170628184816.28300-1-bjorn.andersson@linaro.org>
Date:   Wed, 28 Jun 2017 11:48:16 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Ohad Ben-Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Clark <robdclark@...il.com>
Cc:     linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] rpmsg: Make modalias work for DeviceTree based devices

When rpmsg devices are expected to be matched based on their compatible
the modalias should reflect this, so that module autoloading has a
chance to match and load the appropriate module.

Reported-by: Rob Clark <robdclark@...il.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
---
 drivers/rpmsg/rpmsg_core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c
index ad3d2a9df287..b7e16fc3a6c7 100644
--- a/drivers/rpmsg/rpmsg_core.c
+++ b/drivers/rpmsg/rpmsg_core.c
@@ -343,6 +343,11 @@ static ssize_t modalias_show(struct device *dev,
 			     struct device_attribute *attr, char *buf)
 {
 	struct rpmsg_device *rpdev = to_rpmsg_device(dev);
+	ssize_t len;
+
+	len = of_device_modalias(dev, buf, PAGE_SIZE);
+	if (len != -ENODEV)
+		return len;
 
 	return sprintf(buf, RPMSG_DEVICE_MODALIAS_FMT "\n", rpdev->id.name);
 }
-- 
2.12.0