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SubjectRe: [PATCH v6 01/22] dt-bindings: mediatek: Add binding for mt8183 IOMMU and SMI
On Sun, 17 Feb 2019 17:04:39 +0800, Yong Wu wrote:
> This patch adds decriptions for mt8183 IOMMU and SMI.
>
> mt8183 has only one M4U like mt8173 and is also MTK IOMMU gen2 which
> uses ARM Short-Descriptor translation table format.
>
> The mt8183 M4U-SMI HW diagram is as below:
>
> EMI
> |
> M4U
> |
> ----------
> | |
> gals0-rx gals1-rx
> | |
> | |
> gals0-tx gals1-tx
> | |
> ------------
> SMI Common
> ------------
> |
> +-----+-----+--------+-----+-----+-------+-------+
> | | | | | | | |
> | | gals-rx gals-rx | gals-rx gals-rx gals-rx
> | | | | | | | |
> | | | | | | | |
> | | gals-tx gals-tx | gals-tx gals-tx gals-tx
> | | | | | | | |
> larb0 larb1 IPU0 IPU1 larb4 larb5 larb6 CCU
> disp vdec img cam venc img cam
>
> All the connections are HW fixed, SW can NOT adjust it.
>
> Compared with mt8173, we add a GALS(Global Async Local Sync) module
> between SMI-common and M4U, and additional GALS between larb2/3/5/6
> and SMI-common. GALS can help synchronize for the modules in different
> clock frequency, it can be seen as a "asynchronous fifo".
>
> GALS can only help transfer the command/data while it doesn't have
> the configuring register, thus it has the special "smi" clock and it
> doesn't have the "apb" clock. From the diagram above, we add "gals0"
> and "gals1" clocks for smi-common and add a "gals" clock for smi-larb.
>
> >From the diagram above, IPU0/IPU1(Image Processor Unit) and CCU(Camera
> Control Unit) is connected with smi-common directly, we can take them
> as "larb2", "larb3" and "larb7", and their register spaces are
> different with the normal larb.
>
> Signed-off-by: Yong Wu <yong.wu@mediatek.com>
> ---
> Hi Rob,
> In this version, I changed the picture in the binding and list the
> detailed SoCs which has "bclk" and "gals". So I don't keep your R-b.
> ---
> .../devicetree/bindings/iommu/mediatek,iommu.txt | 30 ++++-
> .../memory-controllers/mediatek,smi-common.txt | 12 +-
> .../memory-controllers/mediatek,smi-larb.txt | 4 +
> include/dt-bindings/memory/mt8183-larb-port.h | 130 +++++++++++++++++++++
> 4 files changed, 170 insertions(+), 6 deletions(-)
> create mode 100644 include/dt-bindings/memory/mt8183-larb-port.h
>

Reviewed-by: Rob Herring <robh@kernel.org>

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