Re: [PATCHv5 5/6] iommu: arm-smmu-impl: Use table to list QCOM implementations

[Robin Murphy]

On 2020-09-22 07:18, Sai Prakash Ranjan wrote:
> Use table and of_match_node() to match qcom implementation
> instead of multiple of_device_compatible() calls for each
> QCOM SMMU implementation.
>
> Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@xxxxxxxxxxxxxx>
> ---
>   drivers/iommu/arm/arm-smmu/arm-smmu-impl.c | 12 ++++++++----
>   1 file changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c b/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c
> index d199b4bff15d..ce78295cfa78 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-impl.c
> @@ -9,6 +9,13 @@
>   
>   #include "arm-smmu.h"
>   
> +static const struct of_device_id __maybe_unused qcom_smmu_impl_of_match[] = {
> +	{ .compatible = "qcom,sc7180-smmu-500" },
> +	{ .compatible = "qcom,sdm845-smmu-500" },
> +	{ .compatible = "qcom,sm8150-smmu-500" },
> +	{ .compatible = "qcom,sm8250-smmu-500" },
> +	{ }
> +};

Can you push the table itself into arm-smmu-qcom? That way you'll be 
free to add new SoCs willy-nilly without any possibility of conflicting 
with anything else.

Bonus points if you can fold in the Adreno variant and keep everything 
together ;)

Robin.

>   static int arm_smmu_gr0_ns(int offset)
>   {
> @@ -217,10 +224,7 @@ struct arm_smmu_device *arm_smmu_impl_init(struct arm_smmu_device *smmu)
>   	if (of_device_is_compatible(np, "nvidia,tegra194-smmu"))
>   		return nvidia_smmu_impl_init(smmu);
>   
> -	if (of_device_is_compatible(np, "qcom,sdm845-smmu-500") ||
> -	    of_device_is_compatible(np, "qcom,sc7180-smmu-500") ||
> -	    of_device_is_compatible(np, "qcom,sm8150-smmu-500") ||
> -	    of_device_is_compatible(np, "qcom,sm8250-smmu-500"))
> +	if (of_match_node(qcom_smmu_impl_of_match, np))
>   		return qcom_smmu_impl_init(smmu);
>   
>   	if (of_device_is_compatible(smmu->dev->of_node, "qcom,adreno-smmu"))