linux-kernel - [RFC PATCH v6 2/2] nvmem: Add Vybrid OCOTP and OCROM support

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Date:	Tue, 23 Jun 2015 19:14:57 +0530
From:	Sanchayan Maity <maitysanchayan@...il.com>
To:	linux-arm-kernel@...ts.infradead.org,
	srinivas.kandagatla@...aro.org, maxime.ripard@...e-electrons.com
Cc:	shawn.guo@...aro.org, arnd@...db.de, kernel@...gutronix.de,
	stefan@...er.ch, linux-kernel@...r.kernel.org,
	Sanchayan Maity <maitysanchayan@...il.com>
Subject: [RFC PATCH v6 2/2] nvmem: Add Vybrid OCOTP and OCROM support

The patch adds support for the On Chip One Time Programmable Peripheral
(OCOTP) and On Chip ROM (OCROM) support.

On Vybrid OCOTP contain data like SoC ID, MAC address and OCROM has the
revision ID.

Signed-off-by: Sanchayan Maity <maitysanchayan@...il.com>
---
 drivers/nvmem/Kconfig       | 11 +++++++++
 drivers/nvmem/Makefile      |  2 ++
 drivers/nvmem/vf610-ocotp.c | 60 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 73 insertions(+)
 create mode 100644 drivers/nvmem/vf610-ocotp.c

diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
index 17f1a57..557c1e0 100644
--- a/drivers/nvmem/Kconfig
+++ b/drivers/nvmem/Kconfig
@@ -33,4 +33,15 @@ config NVMEM_SUNXI_SID
 	  This driver can also be built as a module. If so, the module
 	  will be called eeprom-sunxi-sid.
 
+config NVMEM_VF610_OCOTP
+	tristate "VF610 SoCs OCOTP support"
+	depends on SOC_VF610
+	select REGMAP_MMIO
+	help
+	  This is a driver for the 'OCOTP' available on various Vybrid
+	  devices.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called nvmem-vf610-ocotp.
+
 endif
diff --git a/drivers/nvmem/Makefile b/drivers/nvmem/Makefile
index cc46791..a9ed113 100644
--- a/drivers/nvmem/Makefile
+++ b/drivers/nvmem/Makefile
@@ -11,3 +11,5 @@ obj-$(CONFIG_QCOM_QFPROM)	+= nvmem_qfprom.o
 nvmem_qfprom-y			:= qfprom.o
 obj-$(CONFIG_NVMEM_SUNXI_SID)	+= nvmem-sunxi-sid.o
 nvmem-sunxi-sid-y		:= sunxi-sid.o
+obj-$(CONFIG_NVMEM_VF610_OCOTP)	+= nvmem-vf610-ocotp.o
+nvmem-vf610-ocotp-y		:= vf610-ocotp.o
diff --git a/drivers/nvmem/vf610-ocotp.c b/drivers/nvmem/vf610-ocotp.c
new file mode 100644
index 0000000..d98772d
--- /dev/null
+++ b/drivers/nvmem/vf610-ocotp.c
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2015 Sanchayan Maity <sanchayan.maity@...adex.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/of.h>
+#include "nvmem-mmio.h"
+
+static struct regmap_config regmap_config = {
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+};
+
+static struct nvmem_config ocotp_config = {
+	.name = "soc_id",
+};
+
+static struct nvmem_config rom_config = {
+	.name = "rom_rev",
+};
+
+static struct nvmem_mmio_data ocotp_data = {
+	.nvmem_config = &ocotp_config,
+	.regmap_config = &regmap_config,
+};
+
+static struct nvmem_mmio_data rom_data = {
+	.nvmem_config = &rom_config,
+	.regmap_config = &regmap_config,
+};
+
+static const struct of_device_id ocotp_of_match[] = {
+	{ .compatible = "fsl,vf610-ocotp", .data = &ocotp_data},
+	{ .compatible = "fsl,vf610-ocrom", .data = &rom_data},
+	{/* sentinel */},
+};
+MODULE_DEVICE_TABLE(of, ocotp_of_match);
+
+static struct platform_driver vf610_ocotp_driver = {
+	.probe = nvmem_mmio_probe,
+	.remove = nvmem_mmio_remove,
+	.driver = {
+		.name = "vf610-nvmem",
+		.of_match_table = ocotp_of_match,
+	},
+};
+module_platform_driver(vf610_ocotp_driver);
+MODULE_AUTHOR("Sanchayan Maity <sanchayan.maity@...adex.com>");
+MODULE_DESCRIPTION("Vybrid NVMEM driver");
+MODULE_LICENSE("GPL v2");
-- 
2.4.4

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