linux-kernel - [PATCH V3] dt-bindings: soc: imx: Add binding doc for spba bus

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Date:   Wed, 11 Nov 2020 08:57:57 -0600
From:   Adam Ford <aford173@...il.com>
To:     devicetree@...r.kernel.org
Cc:     aford@...conembedded.com, Adam Ford <aford173@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH V3] dt-bindings: soc: imx: Add binding doc for spba bus

Add binding doc for fsl,spba-bus.

Signed-off-by: Adam Ford <aford173@...il.com>
---
make dt_binding_check showed no errors if I did this right.

V3:  Rebase sample from aips-bus example
     Split off from series adding i.MX8M Nano functions to reduce noise
V2:  Attempted to update yaml from feedback

diff --git a/Documentation/devicetree/bindings/Makefile b/Documentation/devicetree/bindings/Makefile
index f50420099a55..ec8073cb2e71 100644
--- a/Documentation/devicetree/bindings/Makefile
+++ b/Documentation/devicetree/bindings/Makefile
@@ -3,8 +3,6 @@ DT_DOC_CHECKER ?= dt-doc-validate
 DT_EXTRACT_EX ?= dt-extract-example
 DT_MK_SCHEMA ?= dt-mk-schema
 
-DT_SCHEMA_LINT = $(shell which yamllint)
-
 DT_SCHEMA_MIN_VERSION = 2020.8.1
 
 PHONY += check_dtschema_version
@@ -26,10 +24,6 @@ find_cmd = find $(srctree)/$(src) \( -name '*.yaml' ! \
 		-name 'processed-schema*' ! \
 		-name '*.example.dt.yaml' \)
 
-quiet_cmd_yamllint = LINT    $(src)
-      cmd_yamllint = $(find_cmd) | \
-                     xargs $(DT_SCHEMA_LINT) -f parsable -c $(srctree)/$(src)/.yamllint
-
 quiet_cmd_chk_bindings = CHKDT   $@
       cmd_chk_bindings = $(find_cmd) | \
                          xargs -n200 -P$$(nproc) $(DT_DOC_CHECKER) -u $(srctree)/$(src)
@@ -43,7 +37,6 @@ quiet_cmd_mk_schema = SCHEMA  $@
 		      rm -f $$f
 
 define rule_chkdt
-	$(if $(DT_SCHEMA_LINT),$(call cmd,yamllint),)
 	$(call cmd,chk_bindings)
 	$(call cmd,mk_schema)
 endef
@@ -55,7 +48,7 @@ override DTC_FLAGS := \
 	-Wno-graph_child_address \
 	-Wno-interrupt_provider
 
-$(obj)/processed-schema-examples.json: $(DT_DOCS) $(src)/.yamllint check_dtschema_version FORCE
+$(obj)/processed-schema-examples.json: $(DT_DOCS) check_dtschema_version FORCE
 	$(call if_changed_rule,chkdt)
 
 ifeq ($(DT_SCHEMA_FILES),)
diff --git a/Documentation/devicetree/bindings/bus/fsl,spba-bus.yaml b/Documentation/devicetree/bindings/bus/fsl,spba-bus.yaml
new file mode 100644
index 000000000000..91dae405ed39
--- /dev/null
+++ b/Documentation/devicetree/bindings/bus/fsl,spba-bus.yaml
@@ -0,0 +1,65 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/bus/fsl,spba-bus.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Shared Peripherals Bus Interface
+
+maintainers:
+  - Shawn Guo <shawnguo@...nel.org>
+
+description: |
+  A simple bus enabling access to shared peripherals.
+
+  The "spba-bus" follows the "simple-bus" set of properties, as
+  specified in the Devicetree Specification.  It is an extension of
+  "simple-bus" because the SDMA controller uses this compatible flag to
+  determine which peripherals are available to it and the range over which
+  the SDMA can access.  There are no special clocks for the bus, because
+  the SDMA controller itself has its interrupt, and clock assignments.
+
+select:
+  properties:
+    compatible:
+      contains:
+        const: fsl,spba-bus
+  required:
+    - compatible
+
+properties:
+  $nodename:
+    pattern: "^bus(@[0-9a-f]+)?$"
+
+  compatible:
+    items:
+      - const: fsl,spba-bus
+      - const: simple-bus
+
+  '#address-cells':
+    enum: [ 1, 2 ]
+
+  '#size-cells':
+    enum: [ 1, 2 ]
+
+  ranges: true
+
+required:
+  - compatible
+  - '#address-cells'
+  - '#size-cells'
+  - ranges
+
+additionalProperties: true
+
+type: object
+
+examples:
+  - |
+    bus@...00000 {
+        compatible = "fsl,spba-bus", "simple-bus";
+        #address-cells = <1>;
+        #size-cells = <1>;
+        reg = <0x30000000 0x100000>;
+        ranges;
+    };
-- 
2.25.1