clocksource: sh_tmu: Add DT support

Document DT bindings and parse them in the TMU driver.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: Simon Horman <horms+renesas@verge.net.au>

1 files changed, 41 insertions, 10 deletions

diff --git a/drivers/clocksource/sh_tmu.c b/drivers/clocksource/sh_tmu.c
index 560a31acbc9c..0f665b8f2461 100644
--- a/drivers/clocksource/sh_tmu.c
+++ b/drivers/clocksource/sh_tmu.c
@@ -24,6 +24,7 @@
 #include <linux/ioport.h>
 #include <linux/irq.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/pm_domain.h>
 #include <linux/pm_runtime.h>
@@ -509,23 +510,48 @@ static int sh_tmu_map_memory(struct sh_tmu_device *tmu)
         return 0;
 }
 
+static int sh_tmu_parse_dt(struct sh_tmu_device *tmu)
+{
+        struct device_node *np = tmu->pdev->dev.of_node;
+
+        tmu->model = SH_TMU;
+        tmu->num_channels = 3;
+
+        of_property_read_u32(np, "#renesas,channels", &tmu->num_channels);
+
+        if (tmu->num_channels != 2 && tmu->num_channels != 3) {
+                dev_err(&tmu->pdev->dev, "invalid number of channels %u\n",
+                        tmu->num_channels);
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
 static int sh_tmu_setup(struct sh_tmu_device *tmu, struct platform_device *pdev)
 {
-        struct sh_timer_config *cfg = pdev->dev.platform_data;
-        const struct platform_device_id *id = pdev->id_entry;
         unsigned int i;
         int ret;
 
-        if (!cfg) {
-                dev_err(&tmu->pdev->dev, "missing platform data\n");
-                return -ENXIO;
-        }
-
         tmu->pdev = pdev;
-        tmu->model = id->driver_data;
 
         raw_spin_lock_init(&tmu->lock);
 
+        if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
+                ret = sh_tmu_parse_dt(tmu);
+                if (ret < 0)
+                        return ret;
+        } else if (pdev->dev.platform_data) {
+                const struct platform_device_id *id = pdev->id_entry;
+                struct sh_timer_config *cfg = pdev->dev.platform_data;
+
+                tmu->model = id->driver_data;
+                tmu->num_channels = hweight8(cfg->channels_mask);
+        } else {
+                dev_err(&tmu->pdev->dev, "missing platform data\n");
+                return -ENXIO;
+        }
+
         /* Get hold of clock. */
         tmu->clk = clk_get(&tmu->pdev->dev, "fck");
         if (IS_ERR(tmu->clk)) {
@@ -545,8 +571,6 @@ static int sh_tmu_setup(struct sh_tmu_device *tmu, struct platform_device *pdev)
         }
 
         /* Allocate and setup the channels. */
-        tmu->num_channels = hweight8(cfg->channels_mask);
-
         tmu->channels = kzalloc(sizeof(*tmu->channels) * tmu->num_channels,
                                 GFP_KERNEL);
         if (tmu->channels == NULL) {
@@ -628,11 +652,18 @@ static const struct platform_device_id sh_tmu_id_table[] = {
 };
 MODULE_DEVICE_TABLE(platform, sh_tmu_id_table);
 
+static const struct of_device_id sh_tmu_of_table[] __maybe_unused = {
+        { .compatible = "renesas,tmu" },
+        { }
+};
+MODULE_DEVICE_TABLE(of, sh_tmu_of_table);
+
 static struct platform_driver sh_tmu_device_driver = {
         .probe          = sh_tmu_probe,
         .remove         = sh_tmu_remove,
         .driver         = {
                 .name   = "sh_tmu",
+                .of_match_table = of_match_ptr(sh_tmu_of_table),
         },
         .id_table       = sh_tmu_id_table,
 };