From: "Fried, Ramon" <ramon.fried@linux.intel.com>
To: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>,
linus.walleij@linaro.org, bgolaszewski@baylibre.com,
linux-gpio@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, vladimir.kondratiev@linux.intel.com
Subject: Re: RFC: gpio: mmio: add support for 3 direction regs
Date: Thu, 3 Jan 2019 10:51:02 +0200 [thread overview]
Message-ID: <28205214-d395-1c17-51ee-970300b6a14e@linux.intel.com> (raw)
In-Reply-To: <ca7c1b99-4166-652b-aa53-8272aa66eb73@mentor.com>
On 1/3/2019 10:07, Vladimir Zapolskiy wrote:
> Hi Ramon,
>
> On 01/03/2019 09:36 AM, Fried, Ramon wrote:
>> Hi.
>>
>> I'm working on a driver for STA2X11 GPIO controller who seems to fit
>> best to the generic mmio driver,
> I hope you have seen the existing driver drivers/gpio/gpio-sta2x11.c
I surely did. we have the same IP in our soc but it was changed a lot internally, don't want to litter the original.
>
>> the only problem I have is with the dir register case. The STA2X11
>> has 3 registers for dir, one for data, one for set and one for
>> clear. The generic-mmio driver has support for this fashion for the
>> dat & set & clear registers but not for dirout/dirin registers.
>>
>> I wonder if support for this is generic enough to deserve a patch, if
>> so I'm willing to quickly add this support, if not, adding a flag
>> such as below, will allow partly using the generic mmio driver only
>> for set/get and the direction can be handled outside the driver.
>>
> If gpio-mmio fits well, then it might be simpler to set a flag
> BGPIOF_UNREADABLE_REG_DIR, then call bgpio_init() and then overwrite
> .direction_input, .direction_output and .get_direction callbacks,
> as a reference you can take a look at gpio-74xx-mmio.c
Nice.
That's an option I didn't think of, better than setting the flag. what about adding the generic support ?
>
> --
> Best wishes,
> Vladimir
next prev parent reply other threads:[~2019-01-03 8:51 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-03 7:36 RFC: gpio: mmio: add support for 3 direction regs Fried, Ramon
2019-01-03 8:07 ` Vladimir Zapolskiy
2019-01-03 8:51 ` Fried, Ramon [this message]
2019-01-03 8:59 ` Vladimir Zapolskiy
2019-01-03 9:30 ` Fried, Ramon
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