linux-kernel - [PATCH 04/14] dt-bindings: Add bindings for peci-aspeed

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Date:   Tue, 13 Jul 2021 00:04:37 +0200
From:   Iwona Winiarska <iwona.winiarska@...el.com>
To:     linux-kernel@...r.kernel.org, openbmc@...ts.ozlabs.org
Cc:     x86@...nel.org, devicetree@...r.kernel.org,
        linux-aspeed@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org, linux-hwmon@...r.kernel.org,
        linux-doc@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Jonathan Corbet <corbet@....net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Yazen Ghannam <yazen.ghannam@....com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>,
        Iwona Winiarska <iwona.winiarska@...el.com>
Subject: [PATCH 04/14] dt-bindings: Add bindings for peci-aspeed

Add device tree bindings for the peci-aspeed controller driver.

Co-developed-by: Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
Signed-off-by: Iwona Winiarska <iwona.winiarska@...el.com>
---
 .../devicetree/bindings/peci/peci-aspeed.yaml | 111 ++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/peci/peci-aspeed.yaml

diff --git a/Documentation/devicetree/bindings/peci/peci-aspeed.yaml b/Documentation/devicetree/bindings/peci/peci-aspeed.yaml
new file mode 100644
index 000000000000..6061e06009fb
--- /dev/null
+++ b/Documentation/devicetree/bindings/peci/peci-aspeed.yaml
@@ -0,0 +1,111 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/peci/peci-aspeed.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Aspeed PECI Bus Device Tree Bindings
+
+maintainers:
+  - Iwona Winiarska <iwona.winiarska@...el.com>
+  - Jae Hyun Yoo <jae.hyun.yoo@...ux.intel.com>
+
+allOf:
+  - $ref: peci-controller.yaml#
+
+properties:
+  compatible:
+    enum:
+      - aspeed,ast2400-peci
+      - aspeed,ast2500-peci
+      - aspeed,ast2600-peci
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    description: |
+      Clock source for PECI controller. Should reference the external
+      oscillator clock.
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+  clock-divider:
+    description: This value determines PECI controller internal clock
+      dividing rate. The divider will be calculated as 2 raised to the
+      power of the given value.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 0
+    maximum: 7
+    default: 0
+
+  msg-timing:
+    description: |
+      Message timing negotiation period. This value will determine the period
+      of message timing negotiation to be issued by PECI controller. The unit
+      of the programmed value is four times of PECI clock period.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 0
+    maximum: 255
+    default: 1
+
+  addr-timing:
+    description: |
+      Address timing negotiation period. This value will determine the period
+      of address timing negotiation to be issued by PECI controller. The unit
+      of the programmed value is four times of PECI clock period.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 0
+    maximum: 255
+    default: 1
+
+  rd-sampling-point:
+    description: |
+      Read sampling point selection. The whole period of a bit time will be
+      divided into 16 time frames. This value will determine the time frame
+      in which the controller will sample PECI signal for data read back.
+      Usually in the middle of a bit time is the best.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 0
+    maximum: 15
+    default: 8
+
+  cmd-timeout-ms:
+    description: |
+      Command timeout in units of ms.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 1
+    maximum: 1000
+    default: 1000
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - resets
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/ast2600-clock.h>
+    peci-controller@...8b000 {
+      compatible = "aspeed,ast2600-peci";
+      reg = <0x1e78b000 0x100>;
+      interrupts = <GIC_SPI 38 IRQ_TYPE_LEVEL_HIGH>;
+      clocks = <&syscon ASPEED_CLK_GATE_REF0CLK>;
+      resets = <&syscon ASPEED_RESET_PECI>;
+      clock-divider = <0>;
+      msg-timing = <1>;
+      addr-timing = <1>;
+      rd-sampling-point = <8>;
+      cmd-timeout-ms = <1000>;
+    };
+...
-- 
2.31.1