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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>
This commit is contained in:
Florian Fainelli 2021-11-12 14:46:32 -08:00 committed by Wim Van Sebroeck
parent 17fffe91ba
commit d6b9c679bb
2 changed files with 15 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/watchdog/bcm7038_wdt.c
View File

@ -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);

8
include/linux/platform_data/bcm7038_wdt.h Normal file
View File

@ -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 */