[PATCH 01/13] dt-bindings: mediatek: Add binding for mt8183 IOMMU and SMI

Rob Herring robh at kernel.org
Sun Sep 16 15:26:16 PDT 2018


On Mon, Sep 03, 2018 at 02:01:30PM +0800, Yong Wu wrote:
> This patch adds decriptions for mt8183 IOMMU and SMI.
> 
> mt8183 has 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  larb2   larb3  larb4 larb5  larb6    CCU
> disp  vdec   IPU0    IPU1   venc  IPU1    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 between larb2/3/5/6 and
> SMI-common. GALS can help synchronize for the modules in different
> clock frequence, it can be seen as a "asynchronous fifo".

s/frequence/frequency/


> GALS can only help transfer the command/data while it don't have the
> register, thus it has the special "smi" clock and it don't have the
> "apb" clock. From the diagram above, we add "gals0" and "gals1"
> clockes for smi-common and add a "gals" clock for smi-larb.

s/clockes/clocks/
s/don't/doesn't/

> From the diagram above, CCU(Camera Control Unit) is connected with
> smi-common directly, we can look it as "larb7" but its register space
> is different with the normal larb.
> 
> Signed-off-by: Yong Wu <yong.wu at mediatek.com>
> ---
>  .../devicetree/bindings/iommu/mediatek,iommu.txt   |  15 ++-
>  .../memory-controllers/mediatek,smi-common.txt     |  11 +-
>  .../memory-controllers/mediatek,smi-larb.txt       |   3 +
>  include/dt-bindings/memory/mt8183-larb-port.h      | 130 +++++++++++++++++++++
>  4 files changed, 153 insertions(+), 6 deletions(-)
>  create mode 100644 include/dt-bindings/memory/mt8183-larb-port.h

With those fixed,

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




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