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>
diff --git a/drivers/clocksource/sh_tmu.c b/drivers/clocksource/sh_tmu.c
index 560a31a..0f665b8 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 @@
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) {
+ tmu->pdev = pdev;
+
+ 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;
}
- tmu->pdev = pdev;
- tmu->model = id->driver_data;
-
- raw_spin_lock_init(&tmu->lock);
-
/* Get hold of clock. */
tmu->clk = clk_get(&tmu->pdev->dev, "fck");
if (IS_ERR(tmu->clk)) {
@@ -545,8 +571,6 @@
}
/* 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 @@
};
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,
};