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

From: Rafał Miłecki
Date: Tue Mar 02 2021 - 03:46:26 EST


From: Rafał Miłecki <rafal@xxxxxxxxxx>

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

Signed-off-by: Rafał Miłecki <rafal@xxxxxxxxxx>
---
.../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@xxxxxxxxxx>
+
+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@1e000000 {
+ compatible = "brcm,nvram";
+ reg = <0x1e000000 0x10000>;
+ };
--
2.26.2