linux-kernel - [RFC PATCH 2/2] driver core: add compatible string in sysfs for platform devices

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Message-ID: <20220803122655.100254-3-nipun.gupta@amd.com>
Date:   Wed, 3 Aug 2022 17:56:55 +0530
From:   Nipun Gupta <nipun.gupta@....com>
To:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <gregkh@...uxfoundation.org>, <rafael@...nel.org>,
        <maz@...nel.org>, <tglx@...utronix.de>
CC:     <okaya@...nel.org>, <harpreet.anand@....com>,
        <michal.simek@....com>, <nikhil.agarwal@....com>,
        Nipun Gupta <nipun.gupta@....com>
Subject: [RFC PATCH 2/2] driver core: add compatible string in sysfs for platform devices

For devices registered dynamically using platform_device_register
API, this patch exposes the sysfs entry for the compatible string.

Signed-off-by: Nipun Gupta <nipun.gupta@....com>
---
 drivers/base/platform.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 51bb2289865c..89949f88a0a1 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -1289,10 +1289,25 @@ static ssize_t driver_override_store(struct device *dev,
 }
 static DEVICE_ATTR_RW(driver_override);
 
+static ssize_t compatible_show(struct device *dev, struct device_attribute *attr,
+			      char *buf)
+{
+	const char *compat;
+	int ret;
+
+	ret = device_property_read_string(dev, "compatible", &compat);
+	if (ret != 0)
+		return 0;
+
+	return sysfs_emit(buf, "%s", compat);
+}
+static DEVICE_ATTR_RO(compatible);
+
 static struct attribute *platform_dev_attrs[] = {
 	&dev_attr_modalias.attr,
 	&dev_attr_numa_node.attr,
 	&dev_attr_driver_override.attr,
+	&dev_attr_compatible.attr,
 	NULL,
 };
 
-- 
2.25.1