The "GMU Wrapper" is Qualcomm's name for "let's treat the GPU blocks
we'd normally assign to the GMU as if they were a part of the GMU, even
though they are not". It's a (good) software representation of the GMU_CX
and GMU_GX register spaces within the GPUSS that helps us programatically
treat these de-facto GMU-less parts in a way that's very similar to their
GMU-equipped cousins, massively saving up on code duplication.
The "wrapper" register space was specifically designed to mimic the layout
of a real GMU, though it rather obviously does not have the M3 core et al.
To sum it all up, the GMU wrapper is essentially a register space within
the GPU, which Linux sees as a dumbed-down regular GMU: there's no clocks,
interrupts, multiple reg spaces, iommus and OPP. Document it.
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
Signed-off-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>
---
.../devicetree/bindings/display/msm/gmu.yaml | 50 ++++++++++++++++------
1 file changed, 38 insertions(+), 12 deletions(-)
diff --git a/Documentation/devicetree/bindings/display/msm/gmu.yaml b/Documentation/devicetree/bindings/display/msm/gmu.yaml
index f31a26305ca9..5fc4106110ad 100644
--- a/Documentation/devicetree/bindings/display/msm/gmu.yaml
+++ b/Documentation/devicetree/bindings/display/msm/gmu.yaml
@@ -19,16 +19,18 @@ description: |
properties:
compatible:
- items:
- - pattern: '^qcom,adreno-gmu-6[0-9][0-9]\.[0-9]$'
- - const: qcom,adreno-gmu
+ oneOf:
+ - items:
+ - pattern: '^qcom,adreno-gmu-6[0-9][0-9]\.[0-9]$'
+ - const: qcom,adreno-gmu
+ - const: qcom,adreno-gmu-wrapper
reg:
- minItems: 3
+ minItems: 1
maxItems: 4
reg-names:
- minItems: 3
+ minItems: 1
maxItems: 4
clocks:
@@ -44,7 +46,6 @@ properties:
- description: GMU HFI interrupt
- description: GMU interrupt
-
interrupt-names:
items:
- const: hfi
@@ -72,14 +73,8 @@ required:
- compatible
- reg
- reg-names
- - clocks
- - clock-names
- - interrupts
- - interrupt-names
- power-domains
- power-domain-names
- - iommus
- - operating-points-v2
additionalProperties: false
@@ -218,6 +213,28 @@ allOf:
- const: axi
- const: memnoc
+ - if:
+ properties:
+ compatible:
+ contains:
+ const: qcom,adreno-gmu-wrapper
+ then:
+ properties:
+ reg:
+ items:
+ - description: GMU wrapper register space
+ reg-names:
+ items:
+ - const: gmu
+ else:
+ required:
+ - clocks
+ - clock-names
+ - interrupts
+ - interrupt-names
+ - iommus
+ - operating-points-v2
+
examples:
- |
#include <dt-bindings/clock/qcom,gpucc-sdm845.h>
@@ -250,3 +267,12 @@ examples:
iommus = <&adreno_smmu 5>;
operating-points-v2 = <&gmu_opp_table>;
};
+
+ gmu_wrapper: gmu@596a000 {
+ compatible = "qcom,adreno-gmu-wrapper";
+ reg = <0x0596a000 0x30000>;
+ reg-names = "gmu";
+ power-domains = <&gpucc GPU_CX_GDSC>,
+ <&gpucc GPU_GX_GDSC>;
+ power-domain-names = "cx", "gx";
+ };
--
2.41.0
