[PATCH] iommu/arm-smmu-qcom: create qcom_smmu_impl for ACPI boot

[Will Deacon]

[+ Lorenzo]

On Mon, Mar 01, 2021 at 03:40:21PM +0800, Shawn Guo wrote:
> Though qcom_adreno_smmu_impl is not used by ACPI boot right now,
> qcom_smmu_impl is already required at least to boot up Lenovo Flex 5G
> laptop.  Let's check asl_compiler_id in IORT header to ensure we are
> running a QCOM SMMU and create qcom_smmu_impl for it.
> 
> !np is used to check ACPI boot, because fwnode of SMMU device is
> a static allocation and thus has_acpi_companion() doesn't work here.
> 
> Signed-off-by: Shawn Guo <shawn.guo at linaro.org>
> ---
>  drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 33 ++++++++++++++++++++++
>  1 file changed, 33 insertions(+)

I don't know what a "asl_compiler_id" is, but it doesn't sound like it
has an awful lot to do with the SMMU.

Lorenzo -- any idea what we should be doing here instead? Probably not
using ACPI?

Will