drivers/thermal/spear_thermal.c: add Device Tree probing capability

SPEAr platforms now support DT and so must convert all drivers to support
DT.  This patch adds DT probing support for SPEAr thermal sensor driver
and updates its documentation too.

Also, as SPEAr is the only user of this driver and is only available with
DT, make this an only DT driver.  So, platform_data is completely removed
and passed via DT now.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Vincenzo Frascino <vincenzo.frascino@st.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Len Brown <len.brown@intel.com>

2 files changed, 17 insertions, 10 deletions

diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index 514a691abea..3ab2bd540b5 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -23,6 +23,7 @@ config SPEAR_THERMAL
         bool "SPEAr thermal sensor driver"
         depends on THERMAL
         depends on PLAT_SPEAR
+        depends on OF
         help
           Enable this to plug the SPEAr thermal sensor driver into the Linux
           thermal framework
diff --git a/drivers/thermal/spear_thermal.c b/drivers/thermal/spear_thermal.c
index c2e32df3b16..ca40d36d0ba 100644
--- a/drivers/thermal/spear_thermal.c
+++ b/drivers/thermal/spear_thermal.c
@@ -20,9 +20,9 @@
 #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/platform_data/spear_thermal.h>
 #include <linux/thermal.h>
 
 #define MD_FACTOR       1000
@@ -103,21 +103,20 @@ static int spear_thermal_probe(struct platform_device *pdev)
 {
         struct thermal_zone_device *spear_thermal = NULL;
         struct spear_thermal_dev *stdev;
-        struct spear_thermal_pdata *pdata;
-        int ret = 0;
+        struct device_node *np = pdev->dev.of_node;
         struct resource *stres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        int ret = 0, val;
+
+        if (!np || !of_property_read_u32(np, "st,thermal-flags", &val)) {
+                dev_err(&pdev->dev, "Failed: DT Pdata not passed\n");
+                return -EINVAL;
+        }
 
         if (!stres) {
                 dev_err(&pdev->dev, "memory resource missing\n");
                 return -ENODEV;
         }
 
-        pdata = dev_get_platdata(&pdev->dev);
-        if (!pdata) {
-                dev_err(&pdev->dev, "platform data is NULL\n");
-                return -EINVAL;
-        }
-
         stdev = devm_kzalloc(&pdev->dev, sizeof(*stdev), GFP_KERNEL);
         if (!stdev) {
                 dev_err(&pdev->dev, "kzalloc fail\n");
@@ -144,7 +143,7 @@ static int spear_thermal_probe(struct platform_device *pdev)
                 goto put_clk;
         }
 
-        stdev->flags = pdata->thermal_flags;
+        stdev->flags = val;
         writel_relaxed(stdev->flags, stdev->thermal_base);
 
         spear_thermal = thermal_zone_device_register("spear_thermal", 0,
@@ -189,6 +188,12 @@ static int spear_thermal_exit(struct platform_device *pdev)
         return 0;
 }
 
+static const struct of_device_id spear_thermal_id_table[] = {
+        { .compatible = "st,thermal-spear1340" },
+        {}
+};
+MODULE_DEVICE_TABLE(of, spear_thermal_id_table);
+
 static struct platform_driver spear_thermal_driver = {
         .probe = spear_thermal_probe,
         .remove = spear_thermal_exit,
@@ -196,6 +201,7 @@ static struct platform_driver spear_thermal_driver = {
                 .name = "spear_thermal",
                 .owner = THIS_MODULE,
                 .pm = &spear_thermal_pm_ops,
+                .of_match_table = of_match_ptr(spear_thermal_id_table),
         },
 };