linux-kernel - Re: [PATCH] soundwire: debugfs: use controller id instead of link

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Date:   Thu, 21 Jan 2021 12:22:52 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Vinod Koul <vkoul@...nel.org>
Cc:     gregkh@...uxfoundation.org, alsa-devel@...a-project.org,
        yung-chuan.liao@...ux.intel.com, linux-kernel@...r.kernel.org,
        sanyog.r.kale@...el.com
Subject: Re: [PATCH] soundwire: debugfs: use controller id instead of link_id



> diff --git a/drivers/soundwire/debugfs.c b/drivers/soundwire/debugfs.c
> index b6cad0d59b7b..f22868614f09 100644
> --- a/drivers/soundwire/debugfs.c
> +++ b/drivers/soundwire/debugfs.c
> @@ -19,13 +19,14 @@ void sdw_bus_debugfs_init(struct sdw_bus *bus)
>                  return;
> 
>          /* create the debugfs master-N */
> +       bus->controller_debugfs = debugfs_create_dir(dev_name(bus->dev), 
> sdw_debugfs_root);

	bus->dev = &md->dev;

dev_name(bus->dev) does not describe a controller at all but an 
individual master.

We might as well just change the information as:

snprintf(name, sizeof(name), "master-%d-%d", bus_id, bus->link_id);

you get the system unique ID and controller-relative ID, and you can 
decide to ignore one or the other on different platform.