diff options
| author | Douglas Anderson <dianders@chromium.org> | 2023-06-16 18:14:38 +0300 |
|---|---|---|
| committer | Bjorn Andersson <andersson@kernel.org> | 2023-06-22 22:20:12 +0300 |
| commit | c0877829ada0406233aee5bd54f6813db79d5f1f (patch) | |
| tree | 6ef955ec774e10b992c07b72aeec71eb63e06e5f /Documentation | |
| parent | 661a4f089317c877aecd598fb70cd46510cc8d29 (diff) | |
| download | linux-c0877829ada0406233aee5bd54f6813db79d5f1f.tar.xz | |
dt-bindings: firmware: qcom,scm: Document that SCM can be dma-coherent
Trogdor devices use firmware backed by TF-A instead of Qualcomm's
normal TZ. On TF-A we end up mapping memory as cacheable. Specifically,
you can see in Trogdor's TF-A code [1] in qti_sip_mem_assign() that we
call qti_mmap_add_dynamic_region() with MT_RO_DATA. This translates
down to MT_MEMORY instead of MT_NON_CACHEABLE or MT_DEVICE.
Let's allow devices like trogdor to be described properly by allowing
"dma-coherent" in the SCM node.
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230616081440.v2.1.Ie79b5f0ed45739695c9970df121e11d724909157@changeid
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/firmware/qcom,scm.yaml | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/firmware/qcom,scm.yaml b/Documentation/devicetree/bindings/firmware/qcom,scm.yaml index 367d04ad1923..83381f3a1341 100644 --- a/Documentation/devicetree/bindings/firmware/qcom,scm.yaml +++ b/Documentation/devicetree/bindings/firmware/qcom,scm.yaml @@ -71,6 +71,8 @@ properties: minItems: 1 maxItems: 3 + dma-coherent: true + interconnects: maxItems: 1 |