From d6a9f0c8f635a9177e39db6386575bd6cdd55931 Mon Sep 17 00:00:00 2001
From: Bjorn Andersson <bjorn.andersson@linaro.org>
Date: Mon, 22 Jun 2020 00:59:54 -0700
Subject: [PATCH] dt-bindings: hwlock: qcom: Allow device on mmio bus

In modern Qualcomm platforms the mutex region of the TCSR is forked off
into its own block, all with a offset of 0 and stride of 4096, and in
some of these platforms no other registers in this region is accessed
from Linux.

Update the binding to allow the hardware block to be described directly
on the mmio bus, in addition to allowing the existing syscon based
definition for backwards compatibility.

Reviewed-by: Vinod Koul <vkoul@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20200622075956.171058-3-bjorn.andersson@linaro.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
 .../bindings/hwlock/qcom-hwspinlock.yaml         | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.yaml b/Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.yaml
index 71e63b52edd5..88f975837588 100644
--- a/Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.yaml
+++ b/Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.yaml
@@ -19,6 +19,9 @@ properties:
       - qcom,sfpb-mutex
       - qcom,tcsr-mutex
 
+  reg:
+    maxItems: 1
+
   '#hwlock-cells':
     const: 1
 
@@ -31,7 +34,12 @@ properties:
 required:
   - compatible
   - '#hwlock-cells'
-  - syscon
+
+oneOf:
+  - required:
+    - reg
+  - required:
+    - syscon
 
 additionalProperties: false
 
@@ -46,6 +54,12 @@ examples:
                 compatible = "qcom,tcsr-mutex";
                 syscon = <&tcsr_mutex_block 0 0x80>;
 
+                #hwlock-cells = <1>;
+        };
+  - |
+        tcsr_mutex: hwlock@1f40000 {
+                compatible = "qcom,tcsr-mutex";
+                reg = <0x01f40000 0x40000>;
                 #hwlock-cells = <1>;
         };
 ...