In the olden days the Qualcomm shared memory (SMEM) region consisted of
multiple chunks of memory, so SMEM was described as a standalone node
with references to its various memory regions.
But practically all modern Qualcomm platforms has a single reserved memory
region used for SMEM. So rather than having to use two nodes to describe
the one SMEM region, update the binding to allow the reserved-memory
region alone to describe SMEM.
The olden format is preserved as valid, as this is widely used already.
Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
---
Changes since v1:
- None
.../bindings/soc/qcom/qcom,smem.yaml | 34 ++++++++++++++++---
1 file changed, 30 insertions(+), 4 deletions(-)
diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,smem.yaml b/Documentation/devicetree/bindings/soc/qcom/qcom,smem.yaml
index f7e17713b3d8..4149cf2b66be 100644
--- a/Documentation/devicetree/bindings/soc/qcom/qcom,smem.yaml
+++ b/Documentation/devicetree/bindings/soc/qcom/qcom,smem.yaml
@@ -10,14 +10,18 @@ maintainers:
- Andy Gross <agross@xxxxxxxxxx>
- Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
-description: |
- This binding describes the Qualcomm Shared Memory Manager, used to share data
- between various subsystems and OSes in Qualcomm platforms.
+description:
+ This binding describes the Qualcomm Shared Memory Manager, a region of
+ reserved-memory used to share data between various subsystems and OSes in
+ Qualcomm platforms.
properties:
compatible:
const: qcom,smem
+ reg:
+ maxItems: 1
+
memory-region:
maxItems: 1
description: handle to memory reservation for main SMEM memory region.
@@ -29,11 +33,19 @@ properties:
$ref: /schemas/types.yaml#/definitions/phandle
description: handle to RPM message memory resource
+ no-map: true
+
required:
- compatible
- - memory-region
- hwlocks
+oneOf:
+ - required:
+ - reg
+ - no-map
+ - required:
+ - memory-region
+
additionalProperties: false
examples:
@@ -43,6 +55,20 @@ examples:
#size-cells = <1>;
ranges;
+ smem@fa00000 {
+ compatible = "qcom,smem";
+ reg = <0xfa00000 0x200000>;
+ no-map;
+
+ hwlocks = <&tcsr_mutex 3>;
+ };
+ };
+ - |
+ reserved-memory {
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges;
+
smem_region: smem@fa00000 {
reg = <0xfa00000 0x200000>;
no-map;
--
2.29.2
