Revert "bcm53xx: add support for reading NVRAM based on DT mapping"

This reverts commit b0376462c1. Those
changes were rejected and were replaced with an NVMEM driver.

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

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

@@ -1,56 +0,0 @@
-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>;
-+    };

target/linux/bcm53xx/patches-5.4/181-0002-firmware-bcm47xx_nvram-support-platform-device-brcm-.patch

@@ -1,85 +0,0 @@
-From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
-Date: Tue, 2 Mar 2021 08:33:13 +0100
-Subject: [PATCH] firmware: bcm47xx_nvram: support platform device "brcm,nvram"
-
-Add support for platform device providing mapping resource. This allows
-reading NVRAM based on DT mapping binding. It's required for devices
-that boot depending on NVRAM stored setup and provides early access to
-NVRAM data.
-
-Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
----
- drivers/firmware/broadcom/bcm47xx_nvram.c | 55 +++++++++++++++++++++++
- 1 file changed, 55 insertions(+)
-
---- a/drivers/firmware/broadcom/bcm47xx_nvram.c
-+++ b/drivers/firmware/broadcom/bcm47xx_nvram.c
-@@ -13,6 +13,7 @@
- #include <linux/kernel.h>
- #include <linux/string.h>
- #include <linux/mtd/mtd.h>
-+#include <linux/platform_device.h>
- #include <linux/bcm47xx_nvram.h>
- 
- #define NVRAM_MAGIC			0x48534C46	/* 'FLSH' */
-@@ -162,6 +163,60 @@ static int nvram_init(void)
- 	return -ENXIO;
- }
- 
-+static int brcm_nvram_probe(struct platform_device *pdev)
-+{
-+	struct nvram_header __iomem *header;
-+	struct device *dev = &pdev->dev;
-+	struct resource *res;
-+	void __iomem *mmio;
-+	size_t copy_len;
-+
-+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-+	if (!res) {
-+		dev_err(dev, "Failed to get resource\n");
-+		return -ENODEV;
-+	}
-+
-+	mmio = ioremap(res->start, resource_size(res));
-+	if (!mmio)
-+		return -ENOMEM;
-+
-+	header = (struct nvram_header *)mmio;
-+	copy_len = DIV_ROUND_UP(sizeof(*header) + header->len, 4);
-+	if (header->magic != NVRAM_MAGIC) {
-+		dev_err(dev, "No NVRAM found at %pR\n", res);
-+		return -EPROTO;
-+	} else if (copy_len > resource_size(res)) {
-+		dev_err(dev, "NVRAM size exceeds %pR\n", res);
-+		return -ERANGE;
-+	} else if (copy_len >= NVRAM_SPACE) {
-+		dev_err(dev, "NVRAM size exceeds buffer size %d\n", NVRAM_SPACE);
-+		return -ENOMEM;
-+	}
-+
-+	__ioread32_copy(nvram_buf, mmio, copy_len);
-+	nvram_buf[NVRAM_SPACE - 1] = '\0';
-+
-+	iounmap(mmio);
-+
-+	return 0;
-+}
-+
-+static const struct of_device_id brcm_nvram_of_match[] = {
-+	{ .compatible = "brcm,nvram "},
-+	{},
-+};
-+
-+static struct platform_driver brcm_nvram_driver = {
-+	.driver = {
-+		.name = "brcm_nvram",
-+		.of_match_table = brcm_nvram_of_match,
-+	},
-+	.probe	= brcm_nvram_probe,
-+};
-+
-+module_platform_driver(brcm_nvram_driver);
-+
- int bcm47xx_nvram_getenv(const char *name, char *val, size_t val_len)
- {
- 	char *var, *value, *end, *eq;