iommu/exynos: Update device tree documentation

Exynos SYSMMU bindings documentation was merged before generic IOMMU
binding have been introduced. This patch updates documentation to match
current state.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/Documentation/devicetree/bindings/iommu/samsung,sysmmu.txt b/Documentation/devicetree/bindings/iommu/samsung,sysmmu.txt
index bc620fe..f61ca25 100644 (file)
--- a/Documentation/devicetree/bindings/iommu/samsung,sysmmu.txt
+++ b/Documentation/devicetree/bindings/iommu/samsung,sysmmu.txt
@@ -23,28 +23,23 @@ MMUs.
   for window 1, 2 and 3.
 * M2M Scalers and G2D in Exynos5420 has one System MMU on the read channel and
   the other System MMU on the write channel.
-The drivers must consider how to handle those System MMUs. One of the idea is
-to implement child devices or sub-devices which are the client devices of the
-System MMU.
 
-Note:
-The current DT binding for the Exynos System MMU is incomplete.
-The following properties can be removed or changed, if found incompatible with
-the "Generic IOMMU Binding" support for attaching devices to the IOMMU.
+For information on assigning System MMU controller to its peripheral devices,
+see generic IOMMU bindings.
 
 Required properties:
 - compatible: Should be "samsung,exynos-sysmmu"
 - reg: A tuple of base address and size of System MMU registers.
+- #iommu-cells: Should be <0>.
 - interrupt-parent: The phandle of the interrupt controller of System MMU
 - interrupts: An interrupt specifier for interrupt signal of System MMU,
              according to the format defined by a particular interrupt
              controller.
 - clock-names: Should be "sysmmu" if the System MMU is needed to gate its clock.
               Optional "master" if the clock to the System MMU is gated by
-              another gate clock other than "sysmmu".
-              Exynos4 SoCs, there needs no "master" clock.
-              Exynos5 SoCs, some System MMUs must have "master" clocks.
-- clocks: Required if the System MMU is needed to gate its clock.
+              another gate clock other than "sysmmu" (usually main gate clock
+              of peripheral device this SYSMMU belongs to).
+- clocks: Phandles for respective clocks described by clock-names.
 - power-domains: Required if the System MMU is needed to gate its power.
          Please refer to the following document:
          Documentation/devicetree/bindings/power/pd-samsung.txt
@@ -57,6 +52,7 @@ Examples:
                power-domains = <&pd_gsc>;
                clocks = <&clock CLK_GSCL0>;
                clock-names = "gscl";
+               iommus = <&sysmmu_gsc0>;
        };
 
        sysmmu_gsc0: sysmmu@13E80000 {
@@ -67,4 +63,5 @@ Examples:
                clock-names = "sysmmu", "master";
                clocks = <&clock CLK_SMMU_GSCL0>, <&clock CLK_GSCL0>;
                power-domains = <&pd_gsc>;
+               #iommu-cells = <0>;
        };