All of lore.kernel.org
 help / color / mirror / Atom feed
From: Kyungmin Park <kmpark@infradead.org>
To: Stephen Warren <swarren@wwwdotorg.org>
Cc: Sean Paul <seanpaul@chromium.org>,
	Tomasz Stanislawski <t.stanislaws@samsung.com>,
	"kgene.kim" <kgene.kim@samsung.com>,
	devicetree-discuss@lists.ozlabs.org,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	dri-devel@lists.freedesktop.org,
	Tomasz Figa <tomasz.figa@gmail.com>,
	InKi Dae <inki.dae@samsung.com>,
	linux-samsung-soc@vger.kernel.org,
	Sylwester Nawrocki <sylvester.nawrocki@gmail.com>,
	Olof Johansson <olofj@chromium.org>,
	linux-arm-kernel@lists.infradead.org,
	RAHUL SHARMA <rahul.sharma@samsung.com>
Subject: Re: [PATCH v3 1/3] drm/exynos: Get HDMI version from device tree
Date: Wed, 6 Feb 2013 09:47:49 +0900	[thread overview]
Message-ID: <CAH9JG2UzCQiMdcx1BeBCAPwT8YnDO2pDD9aA-L1XKasOgNr3wg@mail.gmail.com> (raw)
In-Reply-To: <5111A6D9.7090700@wwwdotorg.org>

On Wed, Feb 6, 2013 at 9:42 AM, Stephen Warren <swarren@wwwdotorg.org> wrote:
> On 02/05/2013 05:37 PM, Sean Paul wrote:
>> On Tue, Feb 5, 2013 at 4:22 PM, Stephen Warren <swarren@wwwdotorg.org> wrote:
>>> n 02/05/2013 04:42 PM, Sean Paul wrote:
>>>> Use the compatible string in the device tree to determine which
>>>> registers/functions to use in the HDMI driver. Also changes the
>>>> references from v13 to 4210 and v14 to 4212 to reflect the IP
>>>> block version instead of the HDMI version.
>>>
>>>> diff --git a/Documentation/devicetree/bindings/drm/exynos/hdmi.txt b/Documentation/devicetree/bindings/drm/exynos/hdmi.txt
>>>
>>> Binding looks sane to me.
>>>
>>>> diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
>>>
>>>>  #ifdef CONFIG_OF
>>>>  static struct of_device_id hdmi_match_types[] = {
>>>>       {
>>>> -             .compatible = "samsung,exynos5-hdmi",
>>>> -             .data   = (void *)HDMI_TYPE14,
>>>> +             .compatible = "samsung,exynos4-hdmi",
>>>>       }, {
>>>>               /* end node */
>>>>       }
>>>
>>> Why not fill in all the "base" compatible values there (I think you need
>>> this anyway so that DTs don't all have to be compatible with
>>> samsung,exynos4-hdmi), with .data containing the HDMI_VER_EXYNOS*
>>> values, then ...
>>>
>>
>> At the moment, all DTs have to be compatible with exynos4-hdmi since
>> it provides the base for the current driver. The driver uses 4210 and
>> 4212 to differentiate between different register addresses and
>> features, but most things are just exynos4-hdmi compatible.
I would like to distinguish between 4210 and 4x12. since it has
different features. e.g., HDMI v1.3 and v1.4.
and I also want to use 4412 instead of 4212. there's no board to use
4212 at mainline until this time.

Thank you,
Kyungmin Park
>
> The DT nodes should include only the compatible values that the HW is
> actually compatible with. If the HW isn't compatible with exynos4-hdmi,
> that value shouldn't be in the compatible property, but instead whatever
> the "base" value that the HW really is compatible with. The driver can
> support multiple "base" compatible values from this table.
>
>>>> @@ -2218,17 +2217,18 @@ static int hdmi_probe(struct platform_device *pdev)
>>>
>>>> +
>>>> +     if (of_device_is_compatible(dev->of_node, "samsung,exynos4210-hdmi"))
>>>> +             hdata->version |= HDMI_VER_EXYNOS4210;
>>>> +     if (of_device_is_compatible(dev->of_node, "samsung,exynos4212-hdmi"))
>>>> +             hdata->version |= HDMI_VER_EXYNOS4212;
>>>> +     if (of_device_is_compatible(dev->of_node, "samsung,exynos5250-hdmi"))
>>>> +             hdata->version |= HDMI_VER_EXYNOS5250;
>>>
>>> Instead of that, do roughly:
>>>
>>>     match = of_match_device(hdmi_match_types, &pdev->dev);
>>>     if (match)
>>>         hdata->version |= (int)match->data;
>>>
>>> That way, it's all table-based. Any future additions to
>>> hdmi_match_types[] won't require another if statement to be added to
>>> probe().
>>
>> I don't think it's that easy. of_match_device returns the first match
>> from the device table, so I'd still need to iterate through the
>> matches. I could still break this out into a table, but I don't think
>> of_match_device is the right way to probe it.
>
> You shouldn't have to iterate over multiple matches. of_match_device()
> is supposed to return the match for the first entry in the compatible
> property, then if there was no match, move on to looking at the next
> entry in the compatible property, etc. In practice, I think it's still
> not implemented quite correctly for this, but you can make it work by
> putting the newest compatible value first in the match table.
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

WARNING: multiple messages have this Message-ID
From: kmpark@infradead.org (Kyungmin Park)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 1/3] drm/exynos: Get HDMI version from device tree
Date: Wed, 6 Feb 2013 09:47:49 +0900	[thread overview]
Message-ID: <CAH9JG2UzCQiMdcx1BeBCAPwT8YnDO2pDD9aA-L1XKasOgNr3wg@mail.gmail.com> (raw)
In-Reply-To: <5111A6D9.7090700@wwwdotorg.org>

On Wed, Feb 6, 2013 at 9:42 AM, Stephen Warren <swarren@wwwdotorg.org> wrote:
> On 02/05/2013 05:37 PM, Sean Paul wrote:
>> On Tue, Feb 5, 2013 at 4:22 PM, Stephen Warren <swarren@wwwdotorg.org> wrote:
>>> n 02/05/2013 04:42 PM, Sean Paul wrote:
>>>> Use the compatible string in the device tree to determine which
>>>> registers/functions to use in the HDMI driver. Also changes the
>>>> references from v13 to 4210 and v14 to 4212 to reflect the IP
>>>> block version instead of the HDMI version.
>>>
>>>> diff --git a/Documentation/devicetree/bindings/drm/exynos/hdmi.txt b/Documentation/devicetree/bindings/drm/exynos/hdmi.txt
>>>
>>> Binding looks sane to me.
>>>
>>>> diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
>>>
>>>>  #ifdef CONFIG_OF
>>>>  static struct of_device_id hdmi_match_types[] = {
>>>>       {
>>>> -             .compatible = "samsung,exynos5-hdmi",
>>>> -             .data   = (void *)HDMI_TYPE14,
>>>> +             .compatible = "samsung,exynos4-hdmi",
>>>>       }, {
>>>>               /* end node */
>>>>       }
>>>
>>> Why not fill in all the "base" compatible values there (I think you need
>>> this anyway so that DTs don't all have to be compatible with
>>> samsung,exynos4-hdmi), with .data containing the HDMI_VER_EXYNOS*
>>> values, then ...
>>>
>>
>> At the moment, all DTs have to be compatible with exynos4-hdmi since
>> it provides the base for the current driver. The driver uses 4210 and
>> 4212 to differentiate between different register addresses and
>> features, but most things are just exynos4-hdmi compatible.
I would like to distinguish between 4210 and 4x12. since it has
different features. e.g., HDMI v1.3 and v1.4.
and I also want to use 4412 instead of 4212. there's no board to use
4212 at mainline until this time.

Thank you,
Kyungmin Park
>
> The DT nodes should include only the compatible values that the HW is
> actually compatible with. If the HW isn't compatible with exynos4-hdmi,
> that value shouldn't be in the compatible property, but instead whatever
> the "base" value that the HW really is compatible with. The driver can
> support multiple "base" compatible values from this table.
>
>>>> @@ -2218,17 +2217,18 @@ static int hdmi_probe(struct platform_device *pdev)
>>>
>>>> +
>>>> +     if (of_device_is_compatible(dev->of_node, "samsung,exynos4210-hdmi"))
>>>> +             hdata->version |= HDMI_VER_EXYNOS4210;
>>>> +     if (of_device_is_compatible(dev->of_node, "samsung,exynos4212-hdmi"))
>>>> +             hdata->version |= HDMI_VER_EXYNOS4212;
>>>> +     if (of_device_is_compatible(dev->of_node, "samsung,exynos5250-hdmi"))
>>>> +             hdata->version |= HDMI_VER_EXYNOS5250;
>>>
>>> Instead of that, do roughly:
>>>
>>>     match = of_match_device(hdmi_match_types, &pdev->dev);
>>>     if (match)
>>>         hdata->version |= (int)match->data;
>>>
>>> That way, it's all table-based. Any future additions to
>>> hdmi_match_types[] won't require another if statement to be added to
>>> probe().
>>
>> I don't think it's that easy. of_match_device returns the first match
>> from the device table, so I'd still need to iterate through the
>> matches. I could still break this out into a table, but I don't think
>> of_match_device is the right way to probe it.
>
> You shouldn't have to iterate over multiple matches. of_match_device()
> is supposed to return the match for the first entry in the compatible
> property, then if there was no match, move on to looking at the next
> entry in the compatible property, etc. In practice, I think it's still
> not implemented quite correctly for this, but you can make it work by
> putting the newest compatible value first in the match table.
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2013-02-06  0:47 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-02-05 23:42 [PATCH v3 0/2] Get the HDMI IP block " Sean Paul
2013-02-05 23:42 ` Sean Paul
2013-02-05 23:42 ` [PATCH v3 1/3] drm/exynos: Get HDMI " Sean Paul
2013-02-05 23:42   ` Sean Paul
2013-02-06  0:22   ` Stephen Warren
2013-02-06  0:22     ` Stephen Warren
2013-02-06  0:37     ` Sean Paul
2013-02-06  0:37       ` Sean Paul
2013-02-06  0:37       ` Sean Paul
2013-02-06  0:42       ` Stephen Warren
2013-02-06  0:42         ` Stephen Warren
2013-02-06  0:47         ` Kyungmin Park [this message]
2013-02-06  0:47           ` Kyungmin Park
2013-02-06  0:56         ` Sean Paul
2013-02-06  0:56           ` Sean Paul
2013-02-06  1:48           ` Joonyoung Shim
2013-02-06  1:48             ` Joonyoung Shim
2013-02-06  2:49           ` Stephen Warren
2013-02-06  2:49             ` Stephen Warren
2013-02-06  2:56           ` 김승우
2013-02-06  2:56             ` 김승우
2013-02-06 19:01             ` Olof Johansson
2013-02-06 19:01               ` Olof Johansson
2013-02-05 23:42 ` [PATCH v3 2/3] ARM: Change exynos5-hdmi references to exynos4-hdmi Sean Paul
2013-02-05 23:42   ` Sean Paul

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=CAH9JG2UzCQiMdcx1BeBCAPwT8YnDO2pDD9aA-L1XKasOgNr3wg@mail.gmail.com \
    --to=kmpark@infradead.org \
    --cc=devicetree-discuss@lists.ozlabs.org \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=inki.dae@samsung.com \
    --cc=kgene.kim@samsung.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-samsung-soc@vger.kernel.org \
    --cc=olofj@chromium.org \
    --cc=rahul.sharma@samsung.com \
    --cc=seanpaul@chromium.org \
    --cc=swarren@wwwdotorg.org \
    --cc=sylvester.nawrocki@gmail.com \
    --cc=t.stanislaws@samsung.com \
    --cc=tomasz.figa@gmail.com \
    --subject='Re: [PATCH v3 1/3] drm/exynos: Get HDMI version from device tree' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.