[PATCH v2 2/5] mfd: ts4800-syscon: add driver for TS-4800 syscon

[Damien Riegel <damien.riegel@savoirfairelinux.com>]

Driver for TS-4800 syscon. These registers belong to a FPGA that is
memory mapped and are used for counters, enable various IPs in the FPGA,
control LEDs, control IOs, etc.

Currently, only the watchdog is handled.

Signed-off-by: Damien Riegel <damien.riegel@savoirfairelinux.com>
---
 .../devicetree/bindings/mfd/ts4800-syscon.txt      | 12 ++++
 drivers/mfd/Kconfig                                |  7 ++
 drivers/mfd/Makefile                               |  1 +
 drivers/mfd/ts4800-syscon.c                        | 84 ++++++++++++++++++++++
 include/linux/mfd/ts4800-syscon.h                  | 24 +++++++
 5 files changed, 128 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/mfd/ts4800-syscon.txt
 create mode 100644 drivers/mfd/ts4800-syscon.c
 create mode 100644 include/linux/mfd/ts4800-syscon.h

diff --git a/Documentation/devicetree/bindings/mfd/ts4800-syscon.txt b/Documentation/devicetree/bindings/mfd/ts4800-syscon.txt
new file mode 100644
index 0000000..8dbc12c
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/ts4800-syscon.txt
@@ -0,0 +1,12 @@
+Technologic Systems Syscon
+
+Required properties:
+- compatible : must be "ts,ts4800-syscon"
+- reg : physical base address and length of memory mapped region
+
+Example:
+
+syscon@b0010000 {
+	compatible = "ts,ts4800-syscon";
+	reg = <0xb0010000 0x3d>;
+};
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 3f68dd2..8f03dce 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1302,6 +1302,13 @@ config MFD_TC6393XB
 	help
 	  Support for Toshiba Mobile IO Controller TC6393XB
 
+config MFD_TS4800_SYSCON
+	tristate "TS-4800 Syscon Support"
+	select REGMAP
+	select REGMAP_MMIO
+	help
+	  Support for TS-4800's FPGA Syscon registers
+
 config MFD_VX855
 	tristate "VIA VX855/VX875 integrated south bridge"
 	depends on PCI
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index ea40e07..e2c0f1b 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -181,6 +181,7 @@ obj-$(CONFIG_MFD_HI6421_PMIC)	+= hi6421-pmic-core.o
 obj-$(CONFIG_MFD_DLN2)		+= dln2.o
 obj-$(CONFIG_MFD_RT5033)	+= rt5033.o
 obj-$(CONFIG_MFD_SKY81452)	+= sky81452.o
+obj-$(CONFIG_MFD_TS4800_SYSCON)	+= ts4800-syscon.o
 
 intel-soc-pmic-objs		:= intel_soc_pmic_core.o intel_soc_pmic_crc.o
 obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
diff --git a/drivers/mfd/ts4800-syscon.c b/drivers/mfd/ts4800-syscon.c
new file mode 100644
index 0000000..1e42e96
--- /dev/null
+++ b/drivers/mfd/ts4800-syscon.c
@@ -0,0 +1,84 @@
+/*
+ * Device driver for TS-4800 FPGA's syscon
+ *
+ * Copyright (c) 2015 - Savoir-faire Linux
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope 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/device.h>
+#include <linux/err.h>
+#include <linux/mfd/core.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/mfd/ts4800-syscon.h>
+
+
+static const struct regmap_config ts4800_regmap_config = {
+	.reg_bits = 32,
+	.reg_stride = 2,
+	.val_bits = 16,
+};
+
+static int ts4800_syscon_probe(struct platform_device *pdev)
+{
+	struct ts4800_syscon *syscon;
+	struct resource *res;
+	void __iomem *base;
+
+	syscon = devm_kzalloc(&pdev->dev, sizeof(*syscon), GFP_KERNEL);
+	if (!syscon)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	syscon->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
+						   &ts4800_regmap_config);
+	if (IS_ERR(syscon->regmap)) {
+		dev_err(&pdev->dev,
+			"regmap init failed: %ld\n",
+			PTR_ERR(syscon->regmap));
+		return PTR_ERR(syscon->regmap);
+	}
+
+	platform_set_drvdata(pdev, syscon);
+
+	return 0;
+}
+
+static int ts4800_syscon_remove(struct platform_device *pdev)
+{
+	return 0;
+}
+
+static const struct of_device_id ts4800_syscon_of_match[] = {
+	{ .compatible = "ts,ts4800-syscon", },
+	{ },
+};
+
+static struct platform_driver ts4800_syscon_driver = {
+	.driver = {
+		.name	= "ts4800_syscon",
+		.of_match_table = ts4800_syscon_of_match,
+	},
+	.probe	= ts4800_syscon_probe,
+	.remove	= ts4800_syscon_remove,
+};
+module_platform_driver(ts4800_syscon_driver);
+
+MODULE_AUTHOR("Damien Riegel <damien.riegel@savoirfairelinux.com>");
+MODULE_DESCRIPTION("TS-4800 Syscon driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/mfd/ts4800-syscon.h b/include/linux/mfd/ts4800-syscon.h
new file mode 100644
index 0000000..3d29184
--- /dev/null
+++ b/include/linux/mfd/ts4800-syscon.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2015 - Savoir-faire Linux
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope 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.
+ */
+
+#ifndef __LINUX_MFD_TS4800_SYSCON_H
+#define __LINUX_MFD_TS4800_SYSCON_H
+
+#include <linux/regmap.h>
+
+struct ts4800_syscon {
+	struct regmap		*regmap;
+};
+
+#endif /* __LINUX_MFD_TS4800_SYSCON_H */
-- 
2.5.0