linux-kernel - Re: [PATCH v2 5/7] ASoC: qdsp6: Add depends on OF

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Date:   Mon, 18 Jun 2018 22:08:48 +0200
From:   Niklas Cassel <niklas.cassel@...aro.org>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Mark Brown <broonie@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Andy Gross <andy.gross@...aro.org>,
        Patrick Lai <plai@...eaurora.org>,
        Banajit Goswami <bgoswami@...eaurora.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        srinivas.kandagatla@...aro.org
Subject: Re: [PATCH v2 5/7] ASoC: qdsp6: Add depends on OF

On Mon, Jun 18, 2018 at 08:48:32AM -0600, Rob Herring wrote:
> On Mon, Jun 18, 2018 at 6:39 AM, Niklas Cassel <niklas.cassel@...aro.org> wrote:
> > On Mon, Jun 18, 2018 at 12:06:42PM +0100, Mark Brown wrote:
> >> On Thu, Jun 14, 2018 at 01:11:36PM +0200, Niklas Cassel wrote:
> >> > of_platform_device_destroy is only defined when building
> >> > with CONFIG_OF=y. Add a depends on OF.
> >>
> >> Is it sensible that of_platform_device_destroy() is only defined when
> >> building with CONFIG_OF=y?
> >
> > I'm redirecting that question to the device tree maintainers.
> >
> > There are a few of_* functions in include/linux/of_platform.h
> > that are only defined when CONFIG_OF=y:
> >
> > of_platform_device_create()
> > of_platform_device_destroy()
> > of_platform_bus_probe()
> > of_device_alloc()
> >
> > Rob, Frank, do you want me to create static inline dummy versions of these?
> 
> No, because generally you should not be using these functions
> directly. Yes, there are some users, but if you look at the tree,
> there are few or isolated (PowerPC) users. Using
> of_platform_populate/of_platform_depopulate is preferred.

of_platform_device_destroy() is also used by sound/soc/qcom/qdsp6/*
which is why I suggested this patch:
https://marc.info/?l=alsa-devel&m=152932497413567
that adds "depends on OF" for SND_SOC_QDSP6 in sound/soc/qcom/Kconfig.

Or do you think that a better solution would be to modify
sound/soc/qcom/qdsp6/* so that it instead uses
of_platform_populate()/of_platform_depopulate()?
(Or perhaps this isn't even an option,
I'm not at all familiar with the QDSP6 code).

Regards,
Niklas