Re: [PATCH 3/6] gpio: add a userspace chardev ABI for GPIOs

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Fri, Jan 29, 2016 at 11:24 AM, Bamvor Zhang Jian
<bamvor.zhangjian@xxxxxxxxxx> wrote:
> On 01/28/2016 07:14 PM, Linus Walleij wrote:
>> On Wed, Jan 27, 2016 at 11:05 AM, Bamvor Zhang Jian
>> <bamvor.zhangjian@xxxxxxxxxx> wrote:
>>
>>> From the api(ioctl GPIO_GET_CHIPINFO_IOCTL: gpiochip_info), it seems
>>> that I could list all the gpiochips or list only one gpiochip. But
>>> I could not list gpiochip belongs to one gpio driver.
>>
>> I think you can get that information from parsing sysfs?
> Yeap, I could get the directory:
> "/sys/devices/platform/gpio-mockup/gpio/"
>
> I notice that you mark the sysfs ABI as obsolete in these series. I
> am not sure whether it is reasonable to read it from syfs when using
> chardev.

They can probably be used in parallel. I don't have a Kconfig
option for the chardev, it is always turned on, so as to make
people use it.

I even consider putting nasty stuff in dmesg and the boot crawl
for people using the sysfs at some point.

Yours,
Linus Walleij
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