linux-kernel - [PATCH 1/3] dt-bindings: bus: simple-pm-bus: Make clocks and power-domains optional

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Date:   Thu,  7 Oct 2021 15:48:56 +0300
From:   Tony Lindgren <tony@...mide.com>
To:     linux-kernel@...r.kernel.org
Cc:     Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-omap@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Rob Herring <robh@...nel.org>,
        Simon Horman <horms+renesas@...ge.net.au>,
        Suman Anna <s-anna@...com>
Subject: [PATCH 1/3] dt-bindings: bus: simple-pm-bus: Make clocks and power-domains optional

Clocks and power domains are not required by the simple-pm-bus driver.
There are buses with read-only registers for clocks and power domains
that are always on.

Even without clocks and power domains configured, simple-pm-bus is still
different from simple-bus as simple-pm-bus enables runtime PM for the bus
driver.

Let's update the binding accordingly as this remove the related warnings
for dt_binding_check for omaps.

Cc: Geert Uytterhoeven <geert+renesas@...der.be>
Cc: Rob Herring <robh@...nel.org>
Cc: Simon Horman <horms+renesas@...ge.net.au>
Cc: Suman Anna <s-anna@...com>
Signed-off-by: Tony Lindgren <tony@...mide.com>
---
 .../devicetree/bindings/bus/simple-pm-bus.yaml  | 17 +++++------------
 1 file changed, 5 insertions(+), 12 deletions(-)

diff --git a/Documentation/devicetree/bindings/bus/simple-pm-bus.yaml b/Documentation/devicetree/bindings/bus/simple-pm-bus.yaml
--- a/Documentation/devicetree/bindings/bus/simple-pm-bus.yaml
+++ b/Documentation/devicetree/bindings/bus/simple-pm-bus.yaml
@@ -13,10 +13,9 @@ description: |
   A Simple Power-Managed Bus is a transparent bus that doesn't need a real
   driver, as it's typically initialized by the boot loader.
 
-  However, its bus controller is part of a PM domain, or under the control
-  of a functional clock.  Hence, the bus controller's PM domain and/or
-  clock must be enabled for child devices connected to the bus (either
-  on-SoC or externally) to function.
+  However, its bus controller is typically part of a PM domain, or under
+  the control of a functional clock.  Without PM domain or functional clock,
+  it still enables runtime PM for the bus driver unlike "simple-bus".
 
   While "simple-pm-bus" follows the "simple-bus" set of properties, as
   specified in the Devicetree Specification, it is not an extension of
@@ -43,10 +42,10 @@ properties:
 
   clocks: true
     # Functional clocks
-    # Required if power-domains is absent, optional otherwise
+    # Typically used if power-domains is absent
 
   power-domains:
-    # Required if clocks is absent, optional otherwise
+    # Typically used if clocks is absent
     minItems: 1
 
 required:
@@ -55,12 +54,6 @@ required:
   - '#size-cells'
   - ranges
 
-anyOf:
-  - required:
-      - clocks
-  - required:
-      - power-domains
-
 additionalProperties: true
 
 examples:
-- 
2.33.0