linux-kernel - [PATCH stblinux.git 1/2] dt-bindings: firmware: add Broadcom's NVRAM memory mapping

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Message-Id: <20210302074405.18998-1-zajec5@gmail.com>
Date:   Tue,  2 Mar 2021 08:44:04 +0100
From:   Rafał Miłecki <zajec5@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Vivek Unune <npcomplete13@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-mips@...r.kernel.org,
        devicetree@...r.kernel.org, bcm-kernel-feedback-list@...adcom.com,
        linux-kernel@...r.kernel.org,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: [PATCH stblinux.git 1/2] dt-bindings: firmware: add Broadcom's NVRAM memory mapping

From: Rafał Miłecki <rafal@...ecki.pl>

NVRAM structure contains device data and can be accessed using MMIO.

Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
---
 .../bindings/firmware/brcm,nvram.yaml         | 41 +++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/firmware/brcm,nvram.yaml

diff --git a/Documentation/devicetree/bindings/firmware/brcm,nvram.yaml b/Documentation/devicetree/bindings/firmware/brcm,nvram.yaml
new file mode 100644
index 000000000000..12af8e2e7c9c
--- /dev/null
+++ b/Documentation/devicetree/bindings/firmware/brcm,nvram.yaml
@@ -0,0 +1,41 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/firmware/brcm,nvram.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Broadcom's NVRAM
+
+maintainers:
+  - Rafał Miłecki <rafal@...ecki.pl>
+
+description: |
+  NVRAM is a structure containing device specific environment variables.
+  It is used for storing device configuration, booting parameters and
+  calibration data.
+
+  It's required very early in booting process and so is made available
+  using memory mapping.
+
+  NVRAM can be found on Broadcom BCM47xx MIPS, Northstar ARM Cortex-A9
+  and some more devices.
+
+properties:
+  compatible:
+    const: brcm,nvram
+
+  reg:
+    description: memory region with NVRAM data
+    maxItems: 1
+
+required:
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    nvram@...00000 {
+         compatible = "brcm,nvram";
+         reg = <0x1e000000 0x10000>;
+    };
-- 
2.26.2