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Date:   Thu, 17 Jan 2019 10:22:36 -0800
From:   Stephen Boyd <>
To:     Andy Gross <>,
        Bjorn Andersson <>,
        David Brown <>,
        Doug Anderson <>,
        Mark Rutland <>,
        Rob Herring <>
Subject: Re: [PATCH v4 2/2] arm64: dts: qcom: sdm845: Extend ranges and describe DMA space

Quoting Bjorn Andersson (2019-01-16 20:29:40)
> For devices attached to an IOMMU, translation between IOVA and physical
> addresses is no longer 1:1 and dma-ranges should be specified to
> describe the available IOVA address space.
> On SDM845 the busses are implemented with 36 address bits, so dma-ranges
> must be defined to reduce the size of the IOVA address space from the 48
> bits supported by the SMMU. Without this DMA allocations may end up with
> IOVAs outside the valid range, that gets truncated by the bus between
> the device and its translation unit.
> Also extend ranges to describe the available address space.
> Signed-off-by: Bjorn Andersson <>
> ---

Reviewed-by: Stephen Boyd <>

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