linux-kernel - [PATCH 1/2] dt-bindings: mfd: Add Baikal-T1 Boot Controller bindings

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Date:   Fri, 6 Mar 2020 16:05:27 +0300
From:   <Sergey.Semin@...kalelectronics.ru>
To:     Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
CC:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Paul Burton <paulburton@...nel.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] dt-bindings: mfd: Add Baikal-T1 Boot Controller bindings

From: Serge Semin <Sergey.Semin@...kalelectronics.ru>

>From Linux point of view Baikal-T1 Boot Controller is a multi-function
memory-mapped device, which provides an access to three memory-mapped
ROMs and to an embedded DW APB SSI-based SPI controller. It's refelected
in the be,bt1-boot-ctl bindings file. So the device must be added to
the system dts-file as an ordinary memory-mapped device node with
a single clocks source phandle declared and with also memory-mapped
spi/mtd-rom sub-devices.

Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
Signed-off-by: Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>
Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc: Paul Burton <paulburton@...nel.org>
Cc: Ralf Baechle <ralf@...ux-mips.org>
---
 .../bindings/mfd/be,bt1-boot-ctl.yaml         | 89 +++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/be,bt1-boot-ctl.yaml

diff --git a/Documentation/devicetree/bindings/mfd/be,bt1-boot-ctl.yaml b/Documentation/devicetree/bindings/mfd/be,bt1-boot-ctl.yaml
new file mode 100644
index 000000000000..bb95a236d231
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/be,bt1-boot-ctl.yaml
@@ -0,0 +1,89 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/be,bt1-boot-ctl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Baikal-T1 Boot Controller bindings
+
+description: |
+  Baikal-T1 SoC Boot Controller is a vendor-specific module responsible
+  for the CPU primary booting up. Mainly it is a special block, which
+  task is to properly start the SoC and then pass the control to the CPU
+  cores. It also provides a MMIO-based interface to a bootable memory
+  devices with an executable code pre-installed for the system to
+  start. The controller includes the next functions:
+  1) Pysically mapped ROMs to transparently access a SoC' internal firmware
+     and SPI Boot flash.
+  2) DW APB SSI-based embedded SPI controller.
+
+maintainers:
+  - Serge Semin <fancer.lancer@...il.com>
+
+properties:
+  compatible:
+    const: be,bt1-boot-ctl
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    description: APB interface clock source.
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: pclk
+
+  "#address-cells": true
+
+  "#size-cells": true
+
+  ranges: true
+
+patternProperties:
+  "^(rom|spi)@[0-9a-fA-F]+$":
+    type: object
+
+    properties:
+      compatible:
+        anyOf:
+          - description: Memory mapped boot ROMs.
+            items:
+             - enum:
+               - be,bt1-int-rom
+               - be,bt1-ssi-rom
+               - be,bt1-boot-rom
+             - const: mtd-rom
+          - description: DW APB SSI-based boot SPI controller.
+            const: be,bt1-boot-ssi
+
+    required:
+      - compatible
+
+additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - "#address-cells"
+  - "#size-cells"
+  - ranges
+  - clocks
+  - clock-names
+
+examples:
+  - |
+    #include <dt-bindings/clock/bt1-ccu.h>
+
+    boot: boot@...40000 {
+      compatible = "be,bt1-boot-ctl";
+      reg = <0x1F040000 0x100>;
+      #address-cells = <1>;
+      #size-cells = <1>;
+      ranges;
+
+      clocks = <&ccu_sys CCU_SYS_APB_CLK>;
+      clock-names = "pclk";
+    };
+...
-- 
2.25.1