bcm53xx: add testing support for kernel 5.10

It still requires fixing PCIe support:
[    6.644699] pcie_iproc_bcma bcma0:7: host bridge /axi@18000000/pcie@12000 ranges:
[    6.652217] pcie_iproc_bcma bcma0:7:   No bus range found for /axi@18000000/pcie@12000, using [bus 00-ff]
[    6.661833] OF: /axi@18000000/pcie@12000: Missing device_type
[    6.667622] pcie_iproc_bcma: probe of bcma0:7 failed with error -12
[    6.673985] pcie_iproc_bcma bcma0:8: host bridge /axi@18000000/pcie@13000 ranges:
[    6.681514] pcie_iproc_bcma bcma0:8:   No bus range found for /axi@18000000/pcie@13000, using [bus 00-ff]
[    6.691137] pcie_iproc_bcma: probe of bcma0:8 failed with error -12
[    6.697522] pcie_iproc_bcma bcma0:9: host bridge /axi@18000000/pcie@14000 ranges:
[    6.705048] pcie_iproc_bcma bcma0:9:   No bus range found for /axi@18000000/pcie@14000, using [bus 00-ff]
[    6.714669] pcie_iproc_bcma: probe of bcma0:9 failed with error -12

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

1 files changed, 124 insertions, 0 deletions

diff --git a/target/linux/bcm53xx/patches-5.10/080-v5.13-0002-nvmem-brcm_nvram-new-driver-exposing-Broadcom-s-NVRA.patch b/target/linux/bcm53xx/patches-5.10/080-v5.13-0002-nvmem-brcm_nvram-new-driver-exposing-Broadcom-s-NVRA.patch
new file mode 100644
index 0000000000..ac89ea4bc2
--- /dev/null
+++ b/target/linux/bcm53xx/patches-5.10/080-v5.13-0002-nvmem-brcm_nvram-new-driver-exposing-Broadcom-s-NVRA.patch
@@ -0,0 +1,124 @@
+From b152bbeb0282bfcf6f91d0d5befd7582c1c3fc23 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
+Date: Fri, 5 Mar 2021 19:32:36 +0100
+Subject: [PATCH] nvmem: brcm_nvram: new driver exposing Broadcom's NVRAM
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This driver provides access to Broadcom's NVRAM.
+
+Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
+Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
+---
+ drivers/nvmem/Kconfig      |  9 +++++
+ drivers/nvmem/Makefile     |  2 +
+ drivers/nvmem/brcm_nvram.c | 78 ++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 89 insertions(+)
+ create mode 100644 drivers/nvmem/brcm_nvram.c
+
+--- a/drivers/nvmem/Kconfig
++++ b/drivers/nvmem/Kconfig
+@@ -270,4 +270,13 @@ config SPRD_EFUSE
+ 	  This driver can also be built as a module. If so, the module
+ 	  will be called nvmem-sprd-efuse.
+ 
++
++config NVMEM_BRCM_NVRAM
++	tristate "Broadcom's NVRAM support"
++	depends on ARCH_BCM_5301X || COMPILE_TEST
++	depends on HAS_IOMEM
++	help
++	  This driver provides support for Broadcom's NVRAM that can be accessed
++	  using I/O mapping.
++
+ endif
+--- a/drivers/nvmem/Makefile
++++ b/drivers/nvmem/Makefile
+@@ -55,3 +55,5 @@ obj-$(CONFIG_NVMEM_ZYNQMP)	+= nvmem_zynq
+ nvmem_zynqmp_nvmem-y		:= zynqmp_nvmem.o
+ obj-$(CONFIG_SPRD_EFUSE)	+= nvmem_sprd_efuse.o
+ nvmem_sprd_efuse-y		:= sprd-efuse.o
++obj-$(CONFIG_NVMEM_BRCM_NVRAM)	+= nvmem_brcm_nvram.o
++nvmem_brcm_nvram-y		:= brcm_nvram.o
+--- /dev/null
++++ b/drivers/nvmem/brcm_nvram.c
+@@ -0,0 +1,78 @@
++// SPDX-License-Identifier: GPL-2.0-only
++/*
++ * Copyright (C) 2021 Rafał Miłecki <rafal@milecki.pl>
++ */
++
++#include <linux/io.h>
++#include <linux/mod_devicetable.h>
++#include <linux/module.h>
++#include <linux/nvmem-provider.h>
++#include <linux/platform_device.h>
++
++struct brcm_nvram {
++	struct device *dev;
++	void __iomem *base;
++};
++
++static int brcm_nvram_read(void *context, unsigned int offset, void *val,
++			   size_t bytes)
++{
++	struct brcm_nvram *priv = context;
++	u8 *dst = val;
++
++	while (bytes--)
++		*dst++ = readb(priv->base + offset++);
++
++	return 0;
++}
++
++static int brcm_nvram_probe(struct platform_device *pdev)
++{
++	struct nvmem_config config = {
++		.name = "brcm-nvram",
++		.reg_read = brcm_nvram_read,
++	};
++	struct device *dev = &pdev->dev;
++	struct resource *res;
++	struct brcm_nvram *priv;
++
++	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
++	if (!priv)
++		return -ENOMEM;
++	priv->dev = dev;
++
++	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++	priv->base = devm_ioremap_resource(dev, res);
++	if (IS_ERR(priv->base))
++		return PTR_ERR(priv->base);
++
++	config.dev = dev;
++	config.priv = priv;
++	config.size = resource_size(res);
++
++	return PTR_ERR_OR_ZERO(devm_nvmem_register(dev, &config));
++}
++
++static const struct of_device_id brcm_nvram_of_match_table[] = {
++	{ .compatible = "brcm,nvram", },
++	{},
++};
++
++static struct platform_driver brcm_nvram_driver = {
++	.probe = brcm_nvram_probe,
++	.driver = {
++		.name = "brcm_nvram",
++		.of_match_table = brcm_nvram_of_match_table,
++	},
++};
++
++static int __init brcm_nvram_init(void)
++{
++	return platform_driver_register(&brcm_nvram_driver);
++}
++
++subsys_initcall_sync(brcm_nvram_init);
++
++MODULE_AUTHOR("Rafał Miłecki");
++MODULE_LICENSE("GPL");
++MODULE_DEVICE_TABLE(of, brcm_nvram_of_match_table);