On Thu, Feb 11, 2021 at 11:29:14AM +0200, Leon Romanovsky wrote:

On Thu, Feb 11, 2021 at 10:08:43AM +0100, Gustavo Pimentel wrote:

quoted

This patch describes the sysfs interface implemented on the dw-xdata-pcie
driver.

Signed-off-by: Gustavo Pimentel <redacted>
---
 Documentation/ABI/testing/sysfs-driver-xdata | 46 ++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-driver-xdata

I don't know and maybe this is how modern drivers are developed now, but my
laptop doesn't have anything driver and vendor specific related under plain
/sys/kernel/* directory.

➜  kernel git:(rdma-next) ls -l /sys/kernel
total 0
drwxr-xr-x.   2 root root    0 Feb 11 11:20 boot_params
drwxr-xr-x.   2 root root    0 Feb 11 11:20 btf
drwxr-xr-x.   2 root root    0 Feb 11 11:20 cgroup
drwxr-xr-x.   2 root root    0 Feb  8 07:45 config
drwx------.  51 root root    0 Feb  8 07:45 debug
-r--r--r--.   1 root root 4096 Feb 11 11:20 fscaps
drwxr-xr-x.   2 root root    0 Feb  8 10:16 iommu_groups
drwxr-xr-x.  94 root root    0 Feb 11 11:20 irq
-r--r--r--.   1 root root 4096 Feb 11 11:20 kexec_crash_loaded
-rw-r--r--.   1 root root 4096 Feb 11 11:20 kexec_crash_size
-r--r--r--.   1 root root 4096 Feb 11 11:20 kexec_loaded
drwxr-xr-x.   2 root root    0 Feb 11 11:20 livepatch
drwxr-xr-x.   6 root root    0 Feb  8 07:45 mm
-r--r--r--.   1 root root  512 Feb 11 11:20 notes
-rw-r--r--.   1 root root 4096 Feb 11 11:20 profiling
-rw-r--r--.   1 root root 4096 Feb 11 11:20 rcu_expedited
-rw-r--r--.   1 root root 4096 Feb 11 11:20 rcu_normal
drwxr-xr-x.   4 root root    0 Feb  8 07:45 security
drwxr-xr-x. 163 root root    0 Feb 11 11:20 slab
drwxr-xr-x.   4 root root    0 Feb 11 11:20 software_nodes
drwx------.   8 root root    0 Feb  8 07:45 tracing
-r--r--r--.   1 root root 4096 Feb 11 11:20 uevent_seqnum
-r--r--r--.   1 root root 4096 Feb 11 11:20 vmcoreinfo

Also it is very uncommon in large subsystems to see custom sysfs entries
for the specific driver. I wonder why this dw-xdata-pcie driver is different.

It is not, and should not do that at all.