linux-kernel - Re: [PATCH 1/2] watchdog: Add Cadence WDT driver

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Message-ID: <533BA48A.6040301@monstr.eu>
Date:	Wed, 02 Apr 2014 07:47:54 +0200
From:	Michal Simek <monstr@...str.eu>
To:	Guenter Roeck <linux@...ck-us.net>
CC:	Harini Katakam <harinik@...inx.com>, grant.likely@...aro.org,
	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	rob@...dley.net, michals@...inx.com,
	linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH 1/2] watchdog: Add Cadence WDT driver

On 04/02/2014 02:32 AM, Guenter Roeck wrote:
> On 04/01/2014 04:20 AM, Michal Simek wrote:
>> Hi Guenter,
>>
>>>> +/**
>>>> + * struct cdns_wdt - Watchdog device structure
>>>> + * @regs: baseaddress of device
>>>> + * @rst: reset flag
>>>> + * @clk: struct clk * of a clock source
>>>> + * @prescaler: for saving prescaler value
>>>> + * @ctrl_clksel: counter clock prescaler selection
>>>> + * @io_lock: spinlock for IO register access
>>>> + * @cdns_wdt_device: watchdog device structure
>>>> + * @cdns_wdt_notifier: notifier structure
>>>> + *
>>>> + * Structure containing parameters specific to cadence watchdog.
>>>> + */
>>>> +struct cdns_wdt {
>>>> +    void __iomem        *regs;
>>>> +    u32            rst;
>>>> +    struct clk        *clk;
>>>> +    u32            prescaler;
>>>> +    u32            ctrl_clksel;
>>>> +    spinlock_t        io_lock;
>>>> +    struct watchdog_device    cdns_wdt_device;
>>>> +    struct notifier_block    cdns_wdt_notifier;
>>>> +};
>>>> +
>>>> +/* Write access to Registers */
>>>> +static inline void cdns_wdt_writereg(void __iomem *offset, u32 val)
>>>> +{
>>>> +    writel_relaxed(val, offset);
>>>> +}
>>>> +
>>>
>>> Not really sure if this function provides any value.
>>
>> I can't see any problem to use this helper IO function
>> but maybe we could do it a little bit differently.
>> Currently implementation is just passing values to writel_relaxed()
>>
>> What about to do it like this?
>>
>> static inline void cdns_wdt_writereg(struct cdns_wdt *wdt, u32 offset, u32 val)
>> {
>>      writel_relaxed(val, wdt->regs + offset);
>> }
>>
> Yes, that would make more sense.

ok good.
Harini: Please use this version instead.

Thanks,
Michal


-- 
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform



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