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In-Reply-To: <647b842d-76a1-7a96-3ea7-8a37b62bc18e@metafoo.de>
From:   Arnd Bergmann <arnd@kernel.org>
Date:   Mon, 15 Nov 2021 11:42:12 +0100
Message-ID: <CAK8P3a2EVseM4t=e982fFhzBGSZxZ2_V-FHwr-fQPd-bkAKaJg@mail.gmail.com>
Subject: Re: [PATCH 01/11] ASoC: dai_dma: remove slave_id field
To:     Lars-Peter Clausen <lars@metafoo.de>
Cc:     Vinod Koul <vkoul@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
        Andy Gross <agross@kernel.org>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Baolin Wang <baolin.wang7@gmail.com>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Chunyan Zhang <zhang.lyra@gmail.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Hyun Kwon <hyun.kwon@xilinx.com>,
        Jaroslav Kysela <perex@perex.cz>,
        Jon Hunter <jonathanh@nvidia.com>,
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        Mark Brown <broonie@kernel.org>,
        Michal Simek <michal.simek@xilinx.com>,
        Nicolas Saenz Julienne <nsaenz@kernel.org>,
        Orson Zhai <orsonzhai@gmail.com>,
        Robert Jarzmik <robert.jarzmik@free.fr>,
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        Thierry Reding <thierry.reding@gmail.com>,
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On Mon, Nov 15, 2021 at 11:14 AM Lars-Peter Clausen <lars@metafoo.de> wrote:
>
> On 11/15/21 9:53 AM, Arnd Bergmann wrote:
> > From: Arnd Bergmann <arnd@arndb.de>
> >
> > This field is never set, and serves no purpose, so remove it.
>
> I agree that we should remove it. Its been legacy support code for a
> while, but the description that there is no user is not right.
>
> The tegra20_spdif driver obviously uses it and that user is removed in
> this patch. I think it makes sense to split that out into a separate
> patch with a description why the driver will still work even with
> slave_id removed. Maybe the best is to remove the whole tegra20_spdif
> driver.

Ok, I'll split out the tegra patch and try to come up with a better
description for it. What I saw in that driver is it just passes down the
slave_id number from a 'struct resource', but there is nothing in
the kernel that sets up this resource.

Do you or someone else have more information on the state of this
driver? I can see that it does not contain any of_device_id based
probing, so it seems that this is either dead code, the platform_device
gets created by some other code that is no longer compatible with
this driver.

      Arnd