linux-kernel - Re: [RFC PATCH v5 6/9] media: tegra: Add Tegra210 Video input driver

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Message-ID: <927e0263-38b4-4502-f2ad-ab76f31412e4@nvidia.com>
Date:   Thu, 26 Mar 2020 10:04:02 -0700
From:   Sowjanya Komatineni <skomatineni@...dia.com>
To:     Sakari Ailus <sakari.ailus@....fi>
CC:     <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <frankc@...dia.com>, <hverkuil@...all.nl>,
        <helen.koike@...labora.com>, <digetx@...il.com>,
        <sboyd@...nel.org>, <linux-media@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v5 6/9] media: tegra: Add Tegra210 Video input driver


On 3/26/20 7:48 AM, Sakari Ailus wrote:
> External email: Use caution opening links or attachments
>
>
> Hi Sowjanya,
>
> On Wed, Mar 25, 2020 at 11:30:18PM -0700, Sowjanya Komatineni wrote:
>> On 3/25/20 4:03 AM, Sakari Ailus wrote:
>>>> +static int tegra_channel_enum_input(struct file *file, void *fh,
>>>> +                                 struct v4l2_input *inp)
>>>> +{
>>>> +     /* currently driver supports internal TPG only */
>>>> +     if (inp->index)
>>>> +             return -EINVAL;
>>>> +
>>>> +     inp->type = V4L2_INPUT_TYPE_CAMERA;
>>>> +     strscpy(inp->name, "Tegra TPG", sizeof(inp->name));
>>>> +
>>>> +     return 0;
>>>> +}
>>>> +
>>>> +static int tegra_channel_g_input(struct file *file, void *priv,
>>>> +                              unsigned int *i)
>>>> +{
>>>> +     *i = 0;
>>>> +     return 0;
>>>> +}
>>>> +
>>>> +static int tegra_channel_s_input(struct file *file, void *priv,
>>>> +                              unsigned int input)
>>>> +{
>>>> +     if (input > 0)
>>>> +             return -EINVAL;
>>>> +
>>>> +     return 0;
>>>> +}
>>> Please see patchset on topic "v4l2-dev/ioctl: Add V4L2_CAP_IO_MC" on
>>> linux-media; it's relevant here, too.
>> Can update in v6 to add device caps V4L2_CAP_IO_MC and remove enum/g/s_input
>> ioctls.
>>
>> But, I don't see this patch "v4l2-dev/ioctl: Add V4L2_CAP_IO_MC" on latest
>> linux-next
> It's not merged yet but likely will be very soon.
>
> --
> Sakari Ailus

OK, Will wait and send v6 once I see that patch merged. Thanks Sakari.