On Nov 11, 2013, at 2:31 AM, Hiroshi Doyu <hdoyu@xxxxxxxxxx> wrote:
> Follow arm,smmu's "mmu-masters" binding.
>
> Signed-off-by: Hiroshi Doyu <hdoyu@xxxxxxxxxx>
> ---
> Update:
> Newly added for v4. In v3, I used "nvidia,swgroups" and
> "nvidia,memory-clients" bindings.
> ---
> .../bindings/iommu/nvidia,tegra30-smmu.txt | 28 ++++-
> drivers/iommu/tegra-smmu.c | 138 +++++++++++++++++----
> 2 files changed, 141 insertions(+), 25 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/iommu/nvidia,tegra30-smmu.txt b/Documentation/devicetree/bindings/iommu/nvidia,tegra30-smmu.txt
> index 89fb543..51884e9 100644
> --- a/Documentation/devicetree/bindings/iommu/nvidia,tegra30-smmu.txt
> +++ b/Documentation/devicetree/bindings/iommu/nvidia,tegra30-smmu.txt
> @@ -8,9 +8,16 @@ Required properties:
> - nvidia,#asids : # of ASIDs
> - dma-window : IOVA start address and length.
> - nvidia,ahb : phandle to the ahb bus connected to SMMU.
> +- mmu-masters : A list of phandles to device nodes representing bus
> + masters for which the SMMU can provide a translation
> + and their corresponding StreamIDs (see example below).
> + Each device node linked from this list must have a
> + "#stream-id-cells" property, indicating the number of
> + StreamIDs(swgroup ID) associated with it, which is defined
> + in "include/dt-bindings/memory/tegra-swgroup.h".
>
> Example:
> - smmu {
> + iommu {
> compatible = "nvidia,tegra30-smmu";
> reg = <0x7000f010 0x02c
> 0x7000f1f0 0x010
> @@ -18,4 +25,23 @@ Example:
> nvidia,#asids = <4>; /* # of ASIDs */
> dma-window = <0 0x40000000>; /* IOVA start & length */
> nvidia,ahb = <&ahb>;
> +
> + mmu-masters = <&host1x TEGRA_SWGROUP_HC>,
> + <&mpe TEGRA_SWGROUP_MPE>,
> + <&vi TEGRA_SWGROUP_VI>,
> + <&epp TEGRA_SWGROUP_EPP>,
> + <&isp TEGRA_SWGROUP_ISP>,
> + <&gr2d TEGRA_SWGROUP_G2>,
> + <&gr3d TEGRA_SWGROUP_NV TEGRA_SWGROUP_NV2>,
> + <&dc TEGRA_SWGROUP_DC>,
> + <&dcb TEGRA_SWGROUP_DCB>,
> + <&uarta TEGRA_SWGROUP_PPCS>,
> + <&uartb TEGRA_SWGROUP_PPCS>,
> + <&uartc TEGRA_SWGROUP_PPCS>,
> + <&uartd TEGRA_SWGROUP_PPCS>,
> + <&uarte TEGRA_SWGROUP_PPCS>,
> + <&sdhci0 TEGRA_SWGROUP_PPCS>,
> + <&sdhci1 TEGRA_SWGROUP_PPCS>,
> + <&sdhci2 TEGRA_SWGROUP_PPCS>,
> + <&sdhci3 TEGRA_SWGROUP_PPCS>;
> };
At first glance this seems backward from all other cases we have in which we usually have the device have a property that points back, like interrupt-parent.
- k
--
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
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