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

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Date:   Thu, 28 Oct 2021 11:18:42 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     linux-kernel@...r.kernel.org, rafal@...ecki.pl,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "maintainer:BROADCOM BCM63XX ARM ARCHITECTURE" 
        <bcm-kernel-feedback-list@...adcom.com>,
        Justin Chen <justinpopo6@...il.com>,
        "open list:WATCHDOG DEVICE DRIVERS" <linux-watchdog@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "open list:MIPS" <linux-mips@...r.kernel.org>,
        "moderated list:BROADCOM BCM63XX ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 3/7] watchdog: bcm7038_wdt: Support platform data
 configuration

On Thu, Oct 28, 2021 at 10:23:18AM -0700, Florian Fainelli wrote:
> 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@...il.com>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
>  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
>