bcm53xx: add support for reading NVRAM based on DT mapping

[openwrt/openwrt.git] / target / linux / bcm53xx / patches-5.4 / 181-0001-dt-bindings-firmware-add-Broadcom-s-NVRAM-memory-map.patch

diff --git a/target/linux/bcm53xx/patches-5.4/181-0001-dt-bindings-firmware-add-Broadcom-s-NVRAM-memory-map.patch b/target/linux/bcm53xx/patches-5.4/181-0001-dt-bindings-firmware-add-Broadcom-s-NVRAM-memory-map.patch
new file mode 100644 (file)
index 0000000..1b05987
--- /dev/null
+++ b/target/linux/bcm53xx/patches-5.4/181-0001-dt-bindings-firmware-add-Broadcom-s-NVRAM-memory-map.patch
@@ -0,0 +1,56 @@
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Tue, 2 Mar 2021 08:23:35 +0100
+Subject: [PATCH] dt-bindings: firmware: add Broadcom's NVRAM memory mapping
+
+NVRAM structure contains device data and can be accessed using MMIO.
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+---
+ .../bindings/firmware/brcm,nvram.yaml         | 41 +++++++++++++++++++
+ 1 file changed, 41 insertions(+)
+ create mode 100644 Documentation/devicetree/bindings/firmware/brcm,nvram.yaml
+
+--- /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@milecki.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@1e000000 {
++         compatible = "brcm,nvram";
++         reg = <0x1e000000 0x10000>;
++    };