linux-kernel - Re: [PATCH] rtc: omap: Support scratch registers

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Message-ID: <4741d4c7-d6f7-ecdb-1eed-1293175f38d9@ti.com>
Date:   Mon, 6 Nov 2017 12:29:15 +0530
From:   Keerthy <j-keerthy@...com>
To:     Sekhar Nori <nsekhar@...com>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        <linux-rtc@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>,
        Linux OMAP List <linux-omap@...r.kernel.org>
Subject: Re: [PATCH] rtc: omap: Support scratch registers



On Monday 06 November 2017 12:25 PM, Sekhar Nori wrote:
> + linux omap list
> 
> On Tuesday 31 October 2017 09:57 PM, Alexandre Belloni wrote:
>> Register an nvmem device to expose the 3 scratch registers (total of 12
>> bytes) to both userspace and kernel space.
>>
>> Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
> 
> Looks good to me.
> 
> Reviewed-by: Sekhar Nori <nsekhar@...com>
> 
> Curious on what you are using these registers for.

This is in response to this:
https://patchwork.kernel.org/patch/9684955/


> 
> Thanks,
> Sekhar
> 
>> ---
>>  drivers/rtc/rtc-omap.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
>>  1 file changed, 45 insertions(+)
>>
>> diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c
>> index d56d937966dc..1d666ac9ef70 100644
>> --- a/drivers/rtc/rtc-omap.c
>> +++ b/drivers/rtc/rtc-omap.c
>> @@ -70,6 +70,10 @@
>>  #define OMAP_RTC_COMP_MSB_REG		0x50
>>  #define OMAP_RTC_OSC_REG		0x54
>>  
>> +#define OMAP_RTC_SCRATCH0_REG		0x60
>> +#define OMAP_RTC_SCRATCH1_REG		0x64
>> +#define OMAP_RTC_SCRATCH2_REG		0x68
>> +
>>  #define OMAP_RTC_KICK0_REG		0x6c
>>  #define OMAP_RTC_KICK1_REG		0x70
>>  
>> @@ -667,6 +671,45 @@ static struct pinctrl_desc rtc_pinctrl_desc = {
>>  	.owner = THIS_MODULE,
>>  };
>>  
>> +static int omap_rtc_scratch_read(void *priv, unsigned int offset, void *_val,
>> +				 size_t bytes)
>> +{
>> +	struct omap_rtc	*rtc = priv;
>> +	u32 *val = _val;
>> +	int i;
>> +
>> +	for (i = 0; i < bytes / 4; i++)
>> +		val[i] = rtc_readl(rtc,
>> +				   OMAP_RTC_SCRATCH0_REG + offset + (i * 4));
>> +
>> +	return 0;
>> +}
>> +
>> +static int omap_rtc_scratch_write(void *priv, unsigned int offset, void *_val,
>> +				  size_t bytes)
>> +{
>> +	struct omap_rtc	*rtc = priv;
>> +	u32 *val = _val;
>> +	int i;
>> +
>> +	rtc->type->unlock(rtc);
>> +	for (i = 0; i < bytes / 4; i++)
>> +		rtc_writel(rtc,
>> +			   OMAP_RTC_SCRATCH0_REG + offset + (i * 4), val[i]);
>> +	rtc->type->lock(rtc);
>> +
>> +	return 0;
>> +}
>> +
>> +static struct nvmem_config omap_rtc_nvmem_config = {
>> +	.name = "omap_rtc_scratch",
>> +	.word_size = 4,
>> +	.stride = 4,
>> +	.size = OMAP_RTC_KICK0_REG - OMAP_RTC_SCRATCH0_REG,
>> +	.reg_read = omap_rtc_scratch_read,
>> +	.reg_write = omap_rtc_scratch_write,
>> +};
>> +
>>  static int omap_rtc_probe(struct platform_device *pdev)
>>  {
>>  	struct omap_rtc	*rtc;
>> @@ -804,6 +847,8 @@ static int omap_rtc_probe(struct platform_device *pdev)
>>  	}
>>  
>>  	rtc->rtc->ops = &omap_rtc_ops;
>> +	omap_rtc_nvmem_config.priv = rtc;
>> +	rtc->rtc->nvmem_config = &omap_rtc_nvmem_config;
>>  
>>  	/* handle periodic and alarm irqs */
>>  	ret = devm_request_irq(&pdev->dev, rtc->irq_timer, rtc_irq, 0,
>> -- 
>> 2.15.0.rc2
>>
>