watchdog: bcm7038_wdt: Support platform data configuration

The BCM7038 watchdog driver needs to be able to obtain a specific clock
name on BCM63xx platforms which is the "periph" clock ticking at 50MHz.
make it possible to specify the clock name to obtain via platform data.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20211112224636.395101-4-f.fainelli@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

diff --git a/drivers/watchdog/bcm7038_wdt.c b/drivers/watchdog/bcm7038_wdt.c
index acaaa0005d5b28ae85382dcd6b9c729205963ead..506cd7ef9c77e980797e8da3a3db71afc8dd6ce3 100644 (file)
--- a/drivers/watchdog/bcm7038_wdt.c
+++ b/drivers/watchdog/bcm7038_wdt.c
@@ -10,6 +10,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
+#include <linux/platform_data/bcm7038_wdt.h>
 #include <linux/pm.h>
 #include <linux/watchdog.h>
 
@@ -133,8 +134,10 @@ static void bcm7038_clk_disable_unprepare(void *data)
 
 static int bcm7038_wdt_probe(struct platform_device *pdev)
 {
+       struct bcm7038_wdt_platform_data *pdata = pdev->dev.platform_data;
        struct device *dev = &pdev->dev;
        struct bcm7038_watchdog *wdt;
+       const char *clk_name = NULL;
        int err;
 
        wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
@@ -147,7 +150,10 @@ static int bcm7038_wdt_probe(struct platform_device *pdev)
        if (IS_ERR(wdt->base))
                return PTR_ERR(wdt->base);
 
-       wdt->clk = devm_clk_get(dev, NULL);
+       if (pdata && pdata->clk_name)
+               clk_name = pdata->clk_name;
+
+       wdt->clk = devm_clk_get(dev, clk_name);
        /* If unable to get clock, use default frequency */
        if (!IS_ERR(wdt->clk)) {
                err = clk_prepare_enable(wdt->clk);

diff --git a/include/linux/platform_data/bcm7038_wdt.h b/include/linux/platform_data/bcm7038_wdt.h
new file mode 100644 (file)
index 0000000..e18cfd9
--- /dev/null
+++ b/include/linux/platform_data/bcm7038_wdt.h
@@ -0,0 +1,8 @@
+#ifndef __BCM7038_WDT_PDATA_H
+#define __BCM7038_WDT_PDATA_H
+
+struct bcm7038_wdt_platform_data {
+       const char *clk_name;
+};
+
+#endif /* __BCM7038_WDT_PDATA_H */