linux-kernel - Re: [PATCH 1/8] soundwire: bus_type: add master

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Date:   Fri, 28 Feb 2020 09:53:36 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        tiwai@...e.de, broonie@...nel.org, vkoul@...nel.org,
        jank@...ence.com, srinivas.kandagatla@...aro.org,
        slawomir.blauciak@...el.com,
        Bard liao <yung-chuan.liao@...ux.intel.com>,
        Rander Wang <rander.wang@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Hui Wang <hui.wang@...onical.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>
Subject: Re: [PATCH 1/8] soundwire: bus_type: add master_device/driver support

> As you are adding new sysfs files here, is there a follow-on patch for
> Documentation/ABI/ updates?

Yes that's the plan. The original patches for sysfs were submitted as an 
RFC:

https://mailman.alsa-project.org/pipermail/alsa-devel/2019-May/148699.html

Most of the sysfs entries would mirror the value of _DSD properties, but 
that's still very useful to check platform integration issues. Some of 
the DSDT blocks are overwritten at run-time depending on BIOS menu 
selections, so it's impossible to figure out what the firmware exposes 
to the OS just by looking at the DSDT contents extracted with acpica tools.