The commit 4585fbcb5331 ("PM / devfreq: Modify the device name as devfreq(X) for sysfs") changed the node name to devfreq(x). After this commit, it is not possible to get the device name through /sys/class/devfreq/devfreq(X)/*.
Add new name attribute in order to get device name.
Cc: stable@vger.kernel.org Fixes: 4585fbcb5331 ("PM / devfreq: Modify the device name as devfreq(X) for sysfs") Signed-off-by: Chanwoo Choi cw00.choi@samsung.com --- Changes from v1: - Update sysfs-class-devfreq documentation - Show device name directly from 'devfreq->dev.parent'
Documentation/ABI/testing/sysfs-class-devfreq | 7 +++++++ drivers/devfreq/devfreq.c | 9 +++++++++ 2 files changed, 16 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-class-devfreq b/Documentation/ABI/testing/sysfs-class-devfreq index 01196e19afca..75897e2fde43 100644 --- a/Documentation/ABI/testing/sysfs-class-devfreq +++ b/Documentation/ABI/testing/sysfs-class-devfreq @@ -7,6 +7,13 @@ Description: The name of devfreq object denoted as ... is same as the name of device using devfreq.
+What: /sys/class/devfreq/.../name +Date: November 2019 +Contact: Chanwoo Choi cw00.choi@samsung.com +Description: + The /sys/class/devfreq/.../name shows the name of device + of the corresponding devfreq object. + What: /sys/class/devfreq/.../governor Date: September 2011 Contact: MyungJoo Ham myungjoo.ham@samsung.com diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index 61c3e2d08969..2e5f64ee1969 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -1476,7 +1476,16 @@ static ssize_t trans_stat_show(struct device *dev, } static DEVICE_ATTR_RO(trans_stat);
+static ssize_t name_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct devfreq *devfreq = to_devfreq(dev); + return sprintf(buf, "%s\n", dev_name(devfreq->dev.parent)); +} +static DEVICE_ATTR_RO(name); + static struct attribute *devfreq_attrs[] = { + &dev_attr_name.attr, &dev_attr_governor.attr, &dev_attr_available_governors.attr, &dev_attr_cur_freq.attr,