linux-kernel - [PATCH RFC v3 1/4] dt-bindings: spmi: Add PMIC ARB v7 schema

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Message-Id: <20240214-spmi-multi-master-support-v3-1-0bae0ef04faf@linaro.org>
Date: Wed, 14 Feb 2024 23:13:46 +0200
From: Abel Vesa <abel.vesa@...aro.org>
To: Stephen Boyd <sboyd@...nel.org>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
 Neil Armstrong <neil.armstrong@...aro.org>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: Srini Kandagatla <srinivas.kandagatla@...aro.org>, 
 Johan Hovold <johan@...nel.org>, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org, 
 linux-mediatek@...ts.infradead.org, Abel Vesa <abel.vesa@...aro.org>
Subject: [PATCH RFC v3 1/4] dt-bindings: spmi: Add PMIC ARB v7 schema

Add dedicated schema for PMIC ARB v7 as it allows multiple
buses by declaring them as child nodes. These child nodes
will follow the generic spmi bus bindings.

Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
---
 .../bindings/spmi/qcom,spmi-pmic-arb-v7.yaml       | 119 +++++++++++++++++++++
 1 file changed, 119 insertions(+)

diff --git a/Documentation/devicetree/bindings/spmi/qcom,spmi-pmic-arb-v7.yaml b/Documentation/devicetree/bindings/spmi/qcom,spmi-pmic-arb-v7.yaml
new file mode 100644
index 000000000000..8a93d2145aa5
--- /dev/null
+++ b/Documentation/devicetree/bindings/spmi/qcom,spmi-pmic-arb-v7.yaml
@@ -0,0 +1,119 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spmi/qcom,spmi-pmic-arb-v7.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm SPMI Controller v7 (PMIC Arbiter)
+
+maintainers:
+  - Stephen Boyd <sboyd@...nel.org>
+
+description: |
+  The SPMI PMIC Arbiter v7 is found on Snapdragon chipsets. It is an SPMI
+  controller with wrapping arbitration logic to allow for multiple on-chip
+  devices to control up to 2 SPMI separate buses.
+
+  The PMIC Arbiter can also act as an interrupt controller, providing interrupts
+  to slave devices.
+
+properties:
+  compatible:
+    const: qcom,spmi-pmic-arb-v7
+
+  reg:
+    items:
+      - description: core registers
+      - description: tx-channel per virtual slave regosters
+      - description: rx-channel (called observer) per virtual slave registers
+
+  reg-names:
+    items:
+      - const: core
+      - const: chnls
+      - const: obsrvr
+
+  ranges: true
+
+  '#address-cells':
+    const: 2
+
+  '#size-cells':
+    const: 2
+
+  qcom,ee:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 0
+    maximum: 5
+    description: >
+      indicates the active Execution Environment identifier
+
+  qcom,channel:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 0
+    maximum: 5
+    description: >
+      which of the PMIC Arb provided channels to use for accesses
+
+patternProperties:
+  "spmi@[0-1]$":
+    type: object
+    $ref: /schemas/spmi/spmi.yaml
+
+required:
+  - compatible
+  - reg-names
+  - qcom,ee
+  - qcom,channel
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    spmi: arbiter@...0000 {
+      compatible = "qcom,spmi-pmic-arb-v7";
+      reg = <0x0c400000 0x3000>,
+            <0x0c500000 0x4000000>,
+            <0x0c440000 0x80000>;
+      reg-names = "core", "chnls", "obsrvr";
+
+      qcom,ee = <0>;
+      qcom,channel = <0>;
+
+      #address-cells = <2>;
+      #size-cells = <2>;
+
+      spmi_bus0: spmi@0 {
+        reg = <0 0x0c42d000 0 0x4000>,
+              <0 0x0c4c0000 0 0x10000>;
+        reg-names = "cnfg", "intr";
+
+        interrupt-names = "periph_irq";
+        interrupts-extended = <&pdc 1 IRQ_TYPE_LEVEL_HIGH>;
+        interrupt-controller;
+        #interrupt-cells = <4>;
+
+        qcom,bus-id = <0>;
+
+        #address-cells = <2>;
+        #size-cells = <0>;
+      };
+
+      spmi_bus1: spmi@1 {
+        reg = <0 0x0c432000 0 0x4000>,
+              <0 0x0c4d0000 0 0x10000>;
+        reg-names = "cnfg", "intr";
+
+        interrupt-names = "periph_irq";
+        interrupts-extended = <&pdc 3 IRQ_TYPE_LEVEL_HIGH>;
+        interrupt-controller;
+        #interrupt-cells = <4>;
+
+        qcom,bus-id = <1>;
+
+        #address-cells = <2>;
+        #size-cells = <0>;
+      };
+    };

-- 
2.34.1