Re: [PATCH] ASoC: SOF: imx: fix reverse CONFIG_SND_SOC_SOF_OF dependency

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On Tue, 2019-10-01 at 16:20 +0200, Arnd Bergmann wrote:
> CONFIG_SND_SOC_SOF_IMX depends on CONFIG_SND_SOC_SOF, but is in
> turn referenced by the sof-of-dev driver. This creates a reverse
> dependency that manifests in a link error when CONFIG_SND_SOC_SOF_OF
> is built-in but CONFIG_SND_SOC_SOF_IMX=m:
> 
> sound/soc/sof/sof-of-dev.o:(.data+0x118): undefined reference to
> `sof_imx8_ops'
> 
> Make the latter a 'bool' symbol and change the Makefile so the imx8
> driver is compiled the same way as the driver using it.
> 
> A nicer way would be to reverse the layering and move all
> the imx specific bits of sof-of-dev.c into the imx driver
> itself, which can then call into the common code. Doing this
> would need more testing and can be done if we add another
> driver like the first one.
> 
> Fixes: f4df4e4042b0 ("ASoC: SOF: imx8: Fix COMPILE_TEST error")
> Fixes: 202acc565a1f ("ASoC: SOF: imx: Add i.MX8 HW support")
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>

Acked-by: Daniel Baluta <daniel.baluta@xxxxxxx>

Indeed we will need to somehow avoid getting sof_imx8_ops from 
sof-of-dev.c by directly referencing it. 

Will keep this in mind for the next platform.

Thanks a lot Arnd!

> ---
>  sound/soc/sof/imx/Kconfig  | 2 +-
>  sound/soc/sof/imx/Makefile | 4 +++-
>  2 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/sound/soc/sof/imx/Kconfig b/sound/soc/sof/imx/Kconfig
> index 5acae75f5750..a3891654a1fc 100644
> --- a/sound/soc/sof/imx/Kconfig
> +++ b/sound/soc/sof/imx/Kconfig
> @@ -12,7 +12,7 @@ config SND_SOC_SOF_IMX_TOPLEVEL
>  if SND_SOC_SOF_IMX_TOPLEVEL
>  
>  config SND_SOC_SOF_IMX8
> -	tristate "SOF support for i.MX8"
> +	bool "SOF support for i.MX8"
>  	depends on IMX_SCU
>  	depends on IMX_DSP
>  	help
> diff --git a/sound/soc/sof/imx/Makefile b/sound/soc/sof/imx/Makefile
> index 6ef908e8c807..9e8f35df0ff2 100644
> --- a/sound/soc/sof/imx/Makefile
> +++ b/sound/soc/sof/imx/Makefile
> @@ -1,4 +1,6 @@
>  # SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
>  snd-sof-imx8-objs := imx8.o
>  
> -obj-$(CONFIG_SND_SOC_SOF_IMX8) += snd-sof-imx8.o
> +ifdef CONFIG_SND_SOC_SOF_IMX8
> +obj-$(CONFIG_SND_SOC_SOF_OF) += snd-sof-imx8.o
> +endif
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