linux-kernel - [PATCH v2 3/7] watchdog: bcm7038_wdt: Support platform data configuration

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Message-Id: <20211029183430.4086765-4-f.fainelli@gmail.com>
Date:   Fri, 29 Oct 2021 11:34:26 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     rafal@...ecki.pl, Florian Fainelli <f.fainelli@...il.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        bcm-kernel-feedback-list@...adcom.com (maintainer:BROADCOM BCM63XX ARM
        ARCHITECTURE), Justin Chen <justinpopo6@...il.com>,
        linux-watchdog@...r.kernel.org (open list:WATCHDOG DEVICE DRIVERS),
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS),
        linux-mips@...r.kernel.org (open list:MIPS),
        linux-arm-kernel@...ts.infradead.org (moderated list:BROADCOM BCM63XX
        ARM ARCHITECTURE)
Subject: [PATCH v2 3/7] 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.

Reviewed-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 drivers/watchdog/bcm7038_wdt.c            | 8 +++++++-
 include/linux/platform_data/bcm7038_wdt.h | 8 ++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100644 include/linux/platform_data/bcm7038_wdt.h

diff --git a/drivers/watchdog/bcm7038_wdt.c b/drivers/watchdog/bcm7038_wdt.c
index acaaa0005d5b..506cd7ef9c77 100644
--- 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
index 000000000000..e18cfd9ec8f9
--- /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 */
-- 
2.25.1