[PATCH 4/4] nvmem: uniphier-efuse: replace driver with a generic MMIO one

["Rafał Miłecki" <zajec5@gmail.com>]

From: Rafał Miłecki <rafal@milecki.pl>

UniPhier eFuse uses a simple MMIO that can be handled with a generic
driver. Replace this driver to avoid code duplication.

Keep Kconfig symbol for a release or two to help with "make oldconfig".

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
---
 drivers/nvmem/Kconfig          |  7 ++-
 drivers/nvmem/Makefile         |  2 -
 drivers/nvmem/mmio.c           |  1 +
 drivers/nvmem/uniphier-efuse.c | 78 ----------------------------------
 4 files changed, 4 insertions(+), 84 deletions(-)
 delete mode 100644 drivers/nvmem/uniphier-efuse.c

diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
index 4d652c7382a6..d65950da39b0 100644
--- a/drivers/nvmem/Kconfig
+++ b/drivers/nvmem/Kconfig
@@ -359,12 +359,11 @@ config NVMEM_UNIPHIER_EFUSE
 	tristate "UniPhier SoCs eFuse support"
 	depends on ARCH_UNIPHIER || COMPILE_TEST
 	depends on HAS_IOMEM
+	select NVMEM_MMIO
 	help
-	  This is a simple driver to dump specified values of UniPhier SoC
-	  from eFuse.
+	  This driver has been replaced by a generic MMIO implementation.
 
-	  This driver can also be built as a module. If so, the module
-	  will be called nvmem-uniphier-efuse.
+	  Update your config as this symbol will be dropped in the next release.
 
 config NVMEM_VF610_OCOTP
 	tristate "VF610 SoC OCOTP support"
diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile
index 7a8e29ea408e..70dd1154c832 100644
--- a/drivers/nvmem/Makefile
+++ b/drivers/nvmem/Makefile
@@ -67,8 +67,6 @@ obj-$(CONFIG_NVMEM_SUNPLUS_OCOTP)	+= nvmem_sunplus_ocotp.o
 nvmem_sunplus_ocotp-y			:= sunplus-ocotp.o
 obj-$(CONFIG_NVMEM_SUNXI_SID)		+= nvmem_sunxi_sid.o
 nvmem_sunxi_sid-y			:= sunxi_sid.o
-obj-$(CONFIG_NVMEM_UNIPHIER_EFUSE)	+= nvmem-uniphier-efuse.o
-nvmem-uniphier-efuse-y			:= uniphier-efuse.o
 obj-$(CONFIG_NVMEM_VF610_OCOTP)		+= nvmem-vf610-ocotp.o
 nvmem-vf610-ocotp-y			:= vf610-ocotp.o
 obj-$(CONFIG_NVMEM_ZYNQMP)		+= nvmem_zynqmp_nvmem.o
diff --git a/drivers/nvmem/mmio.c b/drivers/nvmem/mmio.c
index 253ade72e0c3..f44ff2a56c56 100644
--- a/drivers/nvmem/mmio.c
+++ b/drivers/nvmem/mmio.c
@@ -60,6 +60,7 @@ static const struct of_device_id mmio_nvmem_of_match_table[] = {
 	/* Custom bindings that were introduced before the mmio one */
 	{ .compatible = "mediatek,mt8173-efuse", },
 	{ .compatible = "mediatek,efuse", },
+	{ .compatible = "socionext,uniphier-efuse", },
 	{},
 };
 
diff --git a/drivers/nvmem/uniphier-efuse.c b/drivers/nvmem/uniphier-efuse.c
deleted file mode 100644
index aca910b3b6f8..000000000000
--- a/drivers/nvmem/uniphier-efuse.c
+++ /dev/null
@@ -1,78 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * UniPhier eFuse driver
- *
- * Copyright (C) 2017 Socionext Inc.
- */
-
-#include <linux/device.h>
-#include <linux/io.h>
-#include <linux/module.h>
-#include <linux/mod_devicetable.h>
-#include <linux/nvmem-provider.h>
-#include <linux/platform_device.h>
-
-struct uniphier_efuse_priv {
-	void __iomem *base;
-};
-
-static int uniphier_reg_read(void *context,
-			     unsigned int reg, void *_val, size_t bytes)
-{
-	struct uniphier_efuse_priv *priv = context;
-	u8 *val = _val;
-	int offs;
-
-	for (offs = 0; offs < bytes; offs += sizeof(u8))
-		*val++ = readb(priv->base + reg + offs);
-
-	return 0;
-}
-
-static int uniphier_efuse_probe(struct platform_device *pdev)
-{
-	struct device *dev = &pdev->dev;
-	struct resource *res;
-	struct nvmem_device *nvmem;
-	struct nvmem_config econfig = {};
-	struct uniphier_efuse_priv *priv;
-
-	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		return -ENOMEM;
-
-	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);
-
-	econfig.stride = 1;
-	econfig.word_size = 1;
-	econfig.read_only = true;
-	econfig.reg_read = uniphier_reg_read;
-	econfig.size = resource_size(res);
-	econfig.priv = priv;
-	econfig.dev = dev;
-	nvmem = devm_nvmem_register(dev, &econfig);
-
-	return PTR_ERR_OR_ZERO(nvmem);
-}
-
-static const struct of_device_id uniphier_efuse_of_match[] = {
-	{ .compatible = "socionext,uniphier-efuse",},
-	{/* sentinel */},
-};
-MODULE_DEVICE_TABLE(of, uniphier_efuse_of_match);
-
-static struct platform_driver uniphier_efuse_driver = {
-	.probe = uniphier_efuse_probe,
-	.driver = {
-		.name = "uniphier-efuse",
-		.of_match_table = uniphier_efuse_of_match,
-	},
-};
-module_platform_driver(uniphier_efuse_driver);
-
-MODULE_AUTHOR("Keiji Hayashibara <hayashibara.keiji@socionext.com>");
-MODULE_DESCRIPTION("UniPhier eFuse driver");
-MODULE_LICENSE("GPL v2");
-- 
2.34.1