On Tue, Oct 1, 2019 at 5:32 PM Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com wrote:
On 10/1/19 9:20 AM, 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.
Or use something like
config SND_SOC_SOF_IMX8_SUPPORT bool "SOF support for i.MX8" depends on IMX_SCU depends on IMX_DSP
config SND_SOC_SOF_IMX8 tristate <i.mx selects>
config SND_SOC_SOF_OF depends on OF select SND_SOC_SOF_IMX8 if SND_SOC_SOF_IMX8_SUPPORT
That way you propagate the module/built-in information. That's how we fixed those issues for the Intel parts.
Yes, I think that would work here as well, but it keeps even more information about the specific drivers in the generic code. It also requires adding more 'select' statements that tend to cause more problems.
The same could be done with a Kconfig-only solution avoiding 'select' such as:
config SND_SOC_SOF_IMX8_SUPPORT bool "SOF support for i.MX8" depends on IMX_SCU depends on IMX_DSP
config SND_SOC_SOF_IMX8 def_tristate SND_SOC_SOF_OF depends on SND_SOC_SOF_IMX8_SUPPORT
Arnd