linux-kernel - Re: [PATCH 1/4] mfd: ti_am335x_tscadc: store physical address

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Date:   Sat, 5 Nov 2016 17:45:14 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     Mugunthan V N <mugunthanvnm@...com>, linux-iio@...r.kernel.org,
        Tony Lindgren <tony@...mide.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Vignesh R <vigneshr@...com>, "Andrew F . Davis" <afd@...com>,
        linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Sekhar Nori <nsekhar@...com>,
        Peter Ujfalusi <peter.ujfalusi@...com>
Subject: Re: [PATCH 1/4] mfd: ti_am335x_tscadc: store physical address

On 31/10/16 08:16, Lee Jones wrote:
> On Sun, 30 Oct 2016, Jonathan Cameron wrote:
> 
>> On 26/10/16 13:17, Lee Jones wrote:
>>> On Fri, 30 Sep 2016, Mugunthan V N wrote:
>>>
>>>> On Wednesday 28 September 2016 01:10 AM, Lee Jones wrote:
>>>>> On Wed, 21 Sep 2016, Mugunthan V N wrote:
>>>>>
>>>>>> store the physical address of the device in its priv to use it
>>>>>> for DMA addressing in the client drivers.
>>>>>>
>>>>>> Signed-off-by: Mugunthan V N <mugunthanvnm@...com>
>>>>>> ---
>>>>>>  drivers/mfd/ti_am335x_tscadc.c       | 1 +
>>>>>>  include/linux/mfd/ti_am335x_tscadc.h | 1 +
>>>>>>  2 files changed, 2 insertions(+)
>>>>>>
>>>>>> diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
>>>>>> index c8f027b..0f3fab4 100644
>>>>>> --- a/drivers/mfd/ti_am335x_tscadc.c
>>>>>> +++ b/drivers/mfd/ti_am335x_tscadc.c
>>>>>> @@ -183,6 +183,7 @@ static	int ti_tscadc_probe(struct platform_device *pdev)
>>>>>>  		tscadc->irq = err;
>>>>>>  
>>>>>>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>>>>> +	tscadc->tscadc_phys_base = res->start;
>>>>>
>>>>> This is unusual.  Can't you use a virt_to_phys() variant instead?
>>>>>
>>>>
>>>> I tried using virt_to_phys(), but its not working for me.
>>>> Also saw many drivers uses like this to get physical address
>>>> ("git grep -n " res->start;" drivers/*").
>>>
>>> Very well:
>>>
>>> For my own reference:
>>>   Acked-for-MFD-by: Lee Jones <lee.jones@...aro.org>
>>>
>>> Let me know how you wish this set to be handled.
>> I'm happy to pick up the whole series.  There are some more mfd
>> header changes in patch 2 but as they only add defines, I
>> don't mind that much if I don't an Ack from you on those
>> (btw this got to V3 but as patch 1 didn't change I'll carry
>> your ack forwards).
>>
>> Do you want an immutable branch?  Seems unlikely to cause
>> much trouble even if there is a merge issue on all 10ish
>> lines of mfd code in the next merge window.
> 
> Not at the moment, but if you could set things up so it's possible to
> create one at a later date if things go Pete Tong, that would be
> great.
Couldn't think of an easy way to do this without creating a branch
and merging it into my normal branch.  I'll not push it out to
kernel.org though unless you tell me you need it.

Applied to the togreg branch (indirectly ;) of iio.git pushed out
as testing for the autobuilders to play with it.

Thanks,

Jonathan

>