[PATCH 08/15] watchdog: orion: Add per-compatible clock initialization

[Ezequiel Garcia]

Following the introduction of the compatible-data field,
it's now possible to further abstract the clock initialization.
This will allow to support SoC with a different clock setup.

Signed-off-by: Ezequiel Garcia <ezequiel.garcia at free-electrons.com>
---
 drivers/watchdog/orion_wdt.c | 28 +++++++++++++++++++++-------
 1 file changed, 21 insertions(+), 7 deletions(-)

diff --git a/drivers/watchdog/orion_wdt.c b/drivers/watchdog/orion_wdt.c
index ed1df3a..696f383 100644
--- a/drivers/watchdog/orion_wdt.c
+++ b/drivers/watchdog/orion_wdt.c
@@ -39,9 +39,13 @@
 static bool nowayout = WATCHDOG_NOWAYOUT;
 static int heartbeat = -1;		/* module parameter (seconds) */
 
+struct orion_watchdog;
+
 struct orion_watchdog_data {
 	int wdt_counter_offset;
 	int wdt_enable_bit;
+	int (*clock_init) (struct platform_device *,
+			   struct orion_watchdog *);
 };
 
 struct orion_watchdog {
@@ -53,6 +57,17 @@ struct orion_watchdog {
 	struct orion_watchdog_data *data;
 };
 
+static int orion_wdt_clock_init(struct platform_device *pdev,
+				struct orion_watchdog *dev)
+{
+	dev->clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(dev->clk))
+		return -ENODEV;
+	clk_prepare_enable(dev->clk);
+	dev->clk_rate = clk_get_rate(dev->clk);
+	return 0;
+}
+
 static int orion_wdt_ping(struct watchdog_device *wdt_dev)
 {
 	struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
@@ -139,6 +154,7 @@ static const struct watchdog_ops orion_wdt_ops = {
 static const struct orion_watchdog_data orion_data = {
 	.wdt_enable_bit = BIT(4),
 	.wdt_counter_offset = 0x24,
+	.clock_init = orion_wdt_clock_init,
 };
 
 static const struct of_device_id orion_wdt_of_match_table[] = {
@@ -173,13 +189,6 @@ static int orion_wdt_probe(struct platform_device *pdev)
 	dev->wdt.min_timeout = 1;
 	dev->data = (struct orion_watchdog_data *)match->data;
 
-	dev->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(dev->clk)) {
-		dev_err(&pdev->dev, "Orion Watchdog missing clock\n");
-		return -ENODEV;
-	}
-	clk_prepare_enable(dev->clk);
-	dev->clk_rate = clk_get_rate(dev->clk);
 	spin_lock_init(&dev->lock);
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -190,6 +199,11 @@ static int orion_wdt_probe(struct platform_device *pdev)
 	if (!dev->reg)
 		return -ENOMEM;
 
+	ret = dev->data->clock_init(pdev, dev);
+	if (ret) {
+		dev_err(&pdev->dev, "cannot initialize clock\n");
+		return ret;
+	}
 	wdt_max_duration = WDT_MAX_CYCLE_COUNT / dev->clk_rate;
 
 	dev->wdt.timeout = wdt_max_duration;
-- 
1.8.1.5