From: Nobuhiro Iwamatsu <redacted>

Some Orion SoC has thermal sensor.
This patch adds support for 88F6282 and 88F6283.

Signed-off-by: Nobuhiro Iwamatsu <redacted>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
---
 .../devicetree/bindings/thermal/orion-thermal.txt  |   16 +++
 drivers/thermal/Kconfig                            |    7 ++
 drivers/thermal/Makefile                           |    1 +
 drivers/thermal/orion_thermal.c                    |  133 ++++++++++++++++++++
 4 files changed, 157 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/thermal/orion-thermal.txt
 create mode 100644 drivers/thermal/orion_thermal.c

diff --git a/Documentation/devicetree/bindings/thermal/orion-thermal.txt b/Documentation/devicetree/bindings/thermal/orion-thermal.txt
new file mode 100644
index 0000000..5ce925d
--- /dev/null
+++ b/Documentation/devicetree/bindings/thermal/orion-thermal.txt

@@ -0,0 +1,16 @@
+* Orion Thermal
+
+This initial version is for Kirkwood 88F8262 & 88F6283 SoCs, however
+it is expected the driver will sometime in the future be expanded to
+also support Dove, using a different compatibility string.
+
+Required properties:
+- compatible : "marvell,kirkwood-thermal"
+- reg : Address range of the thermal registers
+
+Example:
+
+       thermal at 10078 {
+               compatible = "marvell,kirkwood";

+               reg = <0x10078 0x4>;
+       };

diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index e1cb6bd..3bba13f 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig

@@ -55,3 +55,10 @@ config EXYNOS_THERMAL
        help
          If you say yes here you get support for TMU (Thermal Managment
          Unit) on SAMSUNG EXYNOS series of SoC.
+
+config ORION_THERMAL
+       tristate "Temperature sensor on Marvel Orion SoCs"

+       depends on PLAT_ORION && THERMAL
+       help
+         Support for the Orion thermal sensor driver into the Linux thermal
+         framework. This currently supports only 88F6282 and 88F6283.

diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
index 885550d..2fc64aa 100644
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile

@@ -6,4 +6,5 @@ obj-$(CONFIG_THERMAL)           += thermal_sys.o
 obj-$(CONFIG_CPU_THERMAL)              += cpu_cooling.o
 obj-$(CONFIG_SPEAR_THERMAL)            += spear_thermal.o
 obj-$(CONFIG_RCAR_THERMAL)     += rcar_thermal.o
+obj-$(CONFIG_ORION_THERMAL)            += orion_thermal.o
 obj-$(CONFIG_EXYNOS_THERMAL)           += exynos_thermal.o

diff --git a/drivers/thermal/orion_thermal.c b/drivers/thermal/orion_thermal.c
new file mode 100644
index 0000000..e8a2a68
--- /dev/null
+++ b/drivers/thermal/orion_thermal.c

@@ -0,0 +1,133 @@
+/*
+ * Orion thermal sensor driver
+ *
+ * Copyright (C) 2012 Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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/device.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/thermal.h>
+
+#define THERMAL_VALID_OFFSET   9
+#define THERMAL_VALID_MASK     0x1
+#define THERMAL_TEMP_OFFSET    10
+#define THERMAL_TEMP_MASK      0x1FF
+
+/* Orion Thermal Sensor Dev Structure */
+struct orion_thermal_dev {
+       void __iomem *base_addr;
+};
+
+static int orion_get_temp(struct thermal_zone_device *thermal,
+                         unsigned long *temp)
+{
+       unsigned long reg;
+       struct orion_thermal_dev *thermal_dev = thermal->devdata;
+
+       reg = readl_relaxed(thermal_dev->base_addr);
+
+       /* Valid check */
+       if (!(reg >> THERMAL_VALID_OFFSET) & THERMAL_VALID_MASK) {
+               dev_info(&thermal->device,
+                        "Temperature sensor reading not valid\n");
+               return -EIO;
+       }
+
+       reg = (reg >> THERMAL_TEMP_OFFSET) & THERMAL_TEMP_MASK;
+       /* Calculate temperature. See Table 814 in 8262 hardware manual. */
+       *temp = ((322UL - reg) * 10000UL * 1000UL) / 13625UL;
+
+       return 0;
+}
+
+static struct thermal_zone_device_ops ops = {
+       .get_temp = orion_get_temp,
+};
+
+static int orion_thermal_probe(struct platform_device *pdev)
+{
+       struct thermal_zone_device *thermal = NULL;
+       struct orion_thermal_dev *thermal_dev;
+       struct resource *res;
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (!res) {
+               dev_err(&pdev->dev, "Failed to get platform resource\n");
+               return -ENODEV;
+       }
+
+       thermal_dev = devm_kzalloc(&pdev->dev, sizeof(*thermal_dev),
+                                  GFP_KERNEL);
+       if (!thermal_dev) {
+               dev_err(&pdev->dev, "kzalloc fail\n");
+               return -ENOMEM;
+       }
+
+       thermal_dev->base_addr = devm_ioremap(&pdev->dev, res->start,
+                                             resource_size(res));
+       if (!thermal_dev->base_addr) {
+               dev_err(&pdev->dev, "Failed to ioremap memory\n");
+               return -ENOMEM;
+       }
+
+       thermal = thermal_zone_device_register("orion_thermal", 0, 0,
+                                  thermal_dev, &ops, 0, 0);
+       if (IS_ERR(thermal)) {
+               dev_err(&pdev->dev,
+                       "Failed to register thermal zone device\n");
+               return  PTR_ERR(thermal);
+       }
+
+       platform_set_drvdata(pdev, thermal);
+
+       dev_info(&thermal->device,
+                KBUILD_MODNAME ": Thermal sensor registered\n");
+
+       return 0;
+}
+
+static int orion_thermal_exit(struct platform_device *pdev)
+{
+       struct thermal_zone_device *orion_thermal = platform_get_drvdata(pdev);
+
+       thermal_zone_device_unregister(orion_thermal);
+       platform_set_drvdata(pdev, NULL);
+
+       return 0;
+}
+
+static const struct of_device_id orion_thermal_id_table[] = {
+       { .compatible = "marvell,kirkwood-thermal" },
+       {}
+};
+MODULE_DEVICE_TABLE(of, orion_thermal_id_table);
+
+static struct platform_driver orion_thermal_driver = {
+       .probe = orion_thermal_probe,
+       .remove = orion_thermal_exit,
+       .driver = {
+               .name = "orion_thermal",
+               .owner = THIS_MODULE,
+               .of_match_table = of_match_ptr(orion_thermal_id_table),
+       },
+};
+
+module_platform_driver(orion_thermal_driver);
+
+MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu@nigauri.org>");
+MODULE_DESCRIPTION("orion thermal driver");
+MODULE_LICENSE("GPL");
--

1.7.10.4