linux-kernel - [PATCH 1/3] dt-bindings: power: reset: add gs101 poweroff bindings

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Message-ID: <20240320020549.71810-1-alexey.klimov@linaro.org>
Date: Wed, 20 Mar 2024 02:05:47 +0000
From: Alexey Klimov <alexey.klimov@...aro.org>
To: sre@...nel.org,
	robh@...nel.org,
	krzysztof.kozlowski+dt@...aro.org,
	linux-pm@...r.kernel.org,
	devicetree@...r.kernel.org,
	peter.griffin@...aro.org,
	robh+dt@...nel.org
Cc: conor+dt@...nel.org,
	linux-samsung-soc@...r.kernel.org,
	semen.protsenko@...aro.org,
	linux-kernel@...r.kernel.org,
	klimov.linux@...il.com,
	kernel-team@...roid.com,
	tudor.ambarus@...aro.org,
	andre.draszik@...aro.org,
	saravanak@...gle.com,
	willmcvicker@...gle.com,
	alexey.klimov@...aro.org,
	alim.akhtar@...sung.com,
	linux-arm-kernel@...ts.infradead.org,
	elder@...aro.org
Subject: [PATCH 1/3] dt-bindings: power: reset: add gs101 poweroff bindings

Signed-off-by: Alexey Klimov <alexey.klimov@...aro.org>
---
 .../power/reset/google,gs101-poweroff.yaml    | 54 +++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/power/reset/google,gs101-poweroff.yaml

diff --git a/Documentation/devicetree/bindings/power/reset/google,gs101-poweroff.yaml b/Documentation/devicetree/bindings/power/reset/google,gs101-poweroff.yaml
new file mode 100644
index 000000000000..d704bf28294a
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/reset/google,gs101-poweroff.yaml
@@ -0,0 +1,54 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/power/reset/google,gs101-poweroff.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Google GS101 poweroff driver
+
+maintainers:
+  - Alexey Klimov <alexey.klimov@...aro.org>
+
+description: |+
+  This is a Google Tensor gs101 poweroff driver using custom regmap
+  to map the poweroff register. The poweroff itself is performed with
+  a write to the poweroff register from a privileged mode. Since generic
+  syscon does not support this, the specific one is required.
+  The write to the poweroff register is defined by the register map pointed
+  by syscon reference plus the offset with the value and mask defined
+  in the poweroff node.
+  Default will be little endian mode, 32 bit access only.
+
+properties:
+  compatible:
+    const: google,gs101-poweroff
+
+  mask:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: Update only the register bits defined by the mask (32 bit).
+
+  offset:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: Offset in the register map for the poweroff register (in bytes).
+
+  samsung,syscon-phandle:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      Phandle to the PMU system controller node.
+
+required:
+  - compatible
+  - offset
+  - mask
+  - samsung,syscon-phandle
+
+additionalProperties: false
+
+examples:
+  - |
+    poweroff {
+        compatible = "google,gs101-poweroff";
+        samsung,syscon-phandle = <&pmu_syscon>;
+        offset = <0x10>;
+        mask = <0x42>;
+    };
-- 
2.43.0