kernel: backport 5.13 mtd partitioning changes

1. Use upstream accepted NVMEM patches
2. Minor fix for BCM4908 partitioning
3. Support for Linksys firmware partitions on Northstar

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

1 files changed, 119 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.4/406-v5.13-0003-dt-bindings-mtd-Document-use-of-nvmem-cells-compatib.patch b/target/linux/generic/backport-5.4/406-v5.13-0003-dt-bindings-mtd-Document-use-of-nvmem-cells-compatib.patch
new file mode 100644
index 0000000000..552919f587
--- /dev/null
+++ b/target/linux/generic/backport-5.4/406-v5.13-0003-dt-bindings-mtd-Document-use-of-nvmem-cells-compatib.patch
@@ -0,0 +1,119 @@
+From ac42c46f983e4a9003a7bb91ad44a23ab7b8f534 Mon Sep 17 00:00:00 2001
+From: Ansuel Smith <ansuelsmth@gmail.com>
+Date: Fri, 12 Mar 2021 07:28:21 +0100
+Subject: [PATCH] dt-bindings: mtd: Document use of nvmem-cells compatible
+
+Document nvmem-cells compatible used to treat mtd partitions as a
+nvmem provider.
+
+Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
+Reviewed-by: Rob Herring <robh@kernel.org>
+Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
+Link: https://lore.kernel.org/linux-mtd/20210312062830.20548-3-ansuelsmth@gmail.com
+---
+ .../bindings/mtd/partitions/nvmem-cells.yaml  | 99 +++++++++++++++++++
+ 1 file changed, 99 insertions(+)
+ create mode 100644 Documentation/devicetree/bindings/mtd/partitions/nvmem-cells.yaml
+
+--- /dev/null
++++ b/Documentation/devicetree/bindings/mtd/partitions/nvmem-cells.yaml
+@@ -0,0 +1,99 @@
++# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
++%YAML 1.2
++---
++$id: http://devicetree.org/schemas/mtd/partitions/nvmem-cells.yaml#
++$schema: http://devicetree.org/meta-schemas/core.yaml#
++
++title: Nvmem cells
++
++description: |
++  Any partition containing the compatible "nvmem-cells" will register as a
++  nvmem provider.
++  Each direct subnodes represents a nvmem cell following the nvmem binding.
++  Nvmem binding to declare nvmem-cells can be found in:
++  Documentation/devicetree/bindings/nvmem/nvmem.yaml
++
++maintainers:
++  - Ansuel Smith <ansuelsmth@gmail.com>
++
++allOf:
++  - $ref: /schemas/nvmem/nvmem.yaml#
++
++properties:
++  compatible:
++    const: nvmem-cells
++
++required:
++  - compatible
++
++additionalProperties: true
++
++examples:
++  - |
++    partitions {
++      compatible = "fixed-partitions";
++      #address-cells = <1>;
++      #size-cells = <1>;
++
++      /* ... */
++
++      };
++      art: art@1200000 {
++        compatible = "nvmem-cells";
++        reg = <0x1200000 0x0140000>;
++        label = "art";
++        read-only;
++        #address-cells = <1>;
++        #size-cells = <1>;
++
++        macaddr_gmac1: macaddr_gmac1@0 {
++          reg = <0x0 0x6>;
++        };
++
++        macaddr_gmac2: macaddr_gmac2@6 {
++          reg = <0x6 0x6>;
++        };
++
++        pre_cal_24g: pre_cal_24g@1000 {
++          reg = <0x1000 0x2f20>;
++        };
++
++        pre_cal_5g: pre_cal_5g@5000{
++          reg = <0x5000 0x2f20>;
++        };
++      };
++  - |
++    partitions {
++        compatible = "fixed-partitions";
++        #address-cells = <1>;
++        #size-cells = <1>;
++
++        partition@0 {
++            label = "bootloader";
++            reg = <0x000000 0x100000>;
++            read-only;
++        };
++
++        firmware@100000 {
++            compatible = "brcm,trx";
++            label = "firmware";
++            reg = <0x100000 0xe00000>;
++        };
++
++        calibration@f00000 {
++            compatible = "nvmem-cells";
++            label = "calibration";
++            reg = <0xf00000 0x100000>;
++            ranges = <0 0xf00000 0x100000>;
++            #address-cells = <1>;
++            #size-cells = <1>;
++
++            wifi0@0 {
++                reg = <0x000000 0x080000>;
++            };
++
++            wifi1@80000 {
++                reg = <0x080000 0x080000>;
++            };
++        };
++    };