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

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Message-ID: <954adfa7-94d9-f785-aeab-6f20c8f4c3b9@kernel.org>
Date:   Sun, 30 Oct 2016 17:05:47 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Lee Jones <lee.jones@...aro.org>,
        Mugunthan V N <mugunthanvnm@...com>
Cc:     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 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.

Jonathan
>