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Date: Sun, 31 Jul 2022 23:47:57 -0500
From: Samuel Holland <samuel@...lland.org>
To: Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Rob Herring <robh+dt@...nel.org>
Cc: Samuel Holland <samuel@...lland.org>, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-sunxi@...ts.linux.dev
Subject: [PATCH 1/2] regulator: dt-bindings: Add Allwinner D1 LDOs
The Allwinner D1 SoC contains two pairs of in-package LDOs. One pair is
for general purpose use. LDOA generally powers the board's 1.8 V rail.
LDOB generally powers the in-package DRAM, where applicable.
The other pair of LDOs powers the analog power domains inside the SoC,
including the audio codec, thermal sensor, and ADCs. These LDOs require
a 0.9 V bandgap voltage reference. The calibration value for the voltage
reference is stored in an eFuse, accessed via an NVMEM cell.
Neither LDO control register is in its own MMIO range; instead, each
regulator device relies on a syscon exported by some "host" device node.
Getting the register via a syscon avoids a dependency on the subsystem/
driver for that host device (e.g. a functioning thermal sensor should
not depend on having the audio codec driver loaded).
Signed-off-by: Samuel Holland <samuel@...lland.org>
---
.../allwinner,sun20i-d1-analog-ldos.yaml | 77 +++++++++++++++++++
.../allwinner,sun20i-d1-system-ldos.yaml | 55 +++++++++++++
2 files changed, 132 insertions(+)
create mode 100644 Documentation/devicetree/bindings/regulator/allwinner,sun20i-d1-analog-ldos.yaml
create mode 100644 Documentation/devicetree/bindings/regulator/allwinner,sun20i-d1-system-ldos.yaml
diff --git a/Documentation/devicetree/bindings/regulator/allwinner,sun20i-d1-analog-ldos.yaml b/Documentation/devicetree/bindings/regulator/allwinner,sun20i-d1-analog-ldos.yaml
new file mode 100644
index 000000000000..df648c56123d
--- /dev/null
+++ b/Documentation/devicetree/bindings/regulator/allwinner,sun20i-d1-analog-ldos.yaml
@@ -0,0 +1,77 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/regulator/allwinner,sun20i-d1-analog-ldos.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Allwinner D1 Analog LDOs
+
+description:
+ Allwinner D1 contains a set of LDOs which are designed to supply analog power
+ inside and outside the SoC. They are controlled by a register within the audio
+ codec MMIO space, but which is not part of the audio codec clock/reset domain,
+ and so is exposed as a syscon.
+
+maintainers:
+ - Samuel Holland <samuel@...lland.org>
+
+properties:
+ compatible:
+ enum:
+ - allwinner,sun20i-d1-analog-ldos
+
+ nvmem-cells:
+ items:
+ - description: NVMEM cell for the calibrated bandgap reference trim value
+
+ nvmem-cell-names:
+ items:
+ - const: bg_trim
+
+ syscon:
+ $ref: /schemas/types.yaml#/definitions/phandle
+ description: phandle of the device containing the power register
+
+patternProperties:
+ "^(aldo|hpldo)$":
+ type: object
+ $ref: regulator.yaml#
+
+required:
+ - compatible
+ - nvmem-cells
+ - nvmem-cell-names
+ - syscon
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ sid: efuse {
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ bg_trim: bg-trim@28 {
+ reg = <0x28 0x4>;
+ bits = <16, 8>;
+ };
+ };
+
+ ldos-analog {
+ compatible = "allwinner,sun20i-d1-analog-ldos";
+ nvmem-cells = <&bg_trim>;
+ nvmem-cell-names = "bg_trim";
+ syscon = <&codec>;
+
+ reg_aldo: aldo {
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <1800000>;
+ };
+
+ reg_hpldo: hpldo {
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <1800000>;
+ };
+ };
+
+...
diff --git a/Documentation/devicetree/bindings/regulator/allwinner,sun20i-d1-system-ldos.yaml b/Documentation/devicetree/bindings/regulator/allwinner,sun20i-d1-system-ldos.yaml
new file mode 100644
index 000000000000..13b2e8c84f1d
--- /dev/null
+++ b/Documentation/devicetree/bindings/regulator/allwinner,sun20i-d1-system-ldos.yaml
@@ -0,0 +1,55 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/regulator/allwinner,sun20i-d1-system-ldos.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Allwinner D1 System LDOs
+
+description:
+ Allwinner D1 contains a pair of general-purpose LDOs which are designed to
+ supply power inside and outside the SoC. They are controlled by a register
+ within the system controller MMIO space.
+
+maintainers:
+ - Samuel Holland <samuel@...lland.org>
+
+properties:
+ compatible:
+ enum:
+ - allwinner,sun20i-d1-system-ldos
+
+ syscon:
+ $ref: /schemas/types.yaml#/definitions/phandle
+ description: phandle of the device containing the LDO control register
+
+patternProperties:
+ "^(ldoa|ldob)$":
+ type: object
+ $ref: regulator.yaml#
+
+required:
+ - compatible
+ - syscon
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ ldos-system {
+ compatible = "allwinner,sun20i-d1-system-ldos";
+ syscon = <&syscon>;
+
+ reg_ldoa: ldoa {
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <1800000>;
+ };
+
+ reg_ldob: ldob {
+ regulator-name = "vcc-dram";
+ regulator-min-microvolt = <1500000>;
+ regulator-max-microvolt = <1500000>;
+ };
+ };
+
+...
--
2.35.1
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