[PATCH v2 08/15] dt-bindings: arm: cpus: Document qcom, msm8916-smp enable-method

[Stephan Gerhold]

Since MSM8916 is an ARM v8 64-bit SoC the CPU cores are normally booted
using "psci" or "spin-table". Unfortunately, some devices come with signed
32-bit-only firmware without ARM64 and PSCI support. This setup is easy to
support since it's very similar to older 32-bit only Qualcomm SoCs
(e.g. MSM8226) and only requires adding a few new definitions to already
existing drivers.

Document the qcom,msm8916-smp enable-method. It is actually just an alias
of qcom,msm8226-smp since it should be implemented identically.
The enable-method is only valid on ARM32 and must not be used on ARM64.

Signed-off-by: Stephan Gerhold <stephan at gerhold.net>
---
Changes in v2:
  - Clarify that this is only supposed to be used on ARM 32-bit
    (Add comment to commit message and DT schema)

The "see above for ARM v8 64-bit" comment refers to this a few lines
above in the DT schema:

      # On ARM v8 64-bit this property is required
      - enum:
          - psci
          - spin-table
---
 Documentation/devicetree/bindings/arm/cpus.yaml | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/arm/cpus.yaml b/Documentation/devicetree/bindings/arm/cpus.yaml
index 11e3e09da2e5..6a95b2a76bdc 100644
--- a/Documentation/devicetree/bindings/arm/cpus.yaml
+++ b/Documentation/devicetree/bindings/arm/cpus.yaml
@@ -211,6 +211,8 @@ properties:
           - qcom,kpss-acc-v1
           - qcom,kpss-acc-v2
           - qcom,msm8226-smp
+          # Only valid on ARM 32-bit, see above for ARM v8 64-bit
+          - qcom,msm8916-smp
           - renesas,apmu
           - renesas,r9a06g032-smp
           - rockchip,rk3036-smp
@@ -295,7 +297,8 @@ properties:
       Specifies the ACC* node associated with this CPU.
 
       Required for systems that have an "enable-method" property
-      value of "qcom,kpss-acc-v1", "qcom,kpss-acc-v2" or "qcom,msm8226-smp"
+      value of "qcom,kpss-acc-v1", "qcom,kpss-acc-v2", "qcom,msm8226-smp"
+      or "qcom,msm8916-smp".
 
       * arm/msm/qcom,kpss-acc.txt
 
-- 
2.33.0