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From: Chen-Yu Tsai <wens@csie.org>
To: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Chen-Yu Tsai <wens@csie.org>,
	Mike Turquette <mturquette@baylibre.com>,
	Stephen Boyd <sboyd@codeaurora.org>,
	David Airlie <airlied@linux.ie>,
	Thierry Reding <thierry.reding@gmail.com>,
	devicetree <devicetree@vger.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	linux-clk <linux-clk@vger.kernel.org>,
	dri-devel <dri-devel@lists.freedesktop.org>,
	linux-sunxi <linux-sunxi@googlegroups.com>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Hans de Goede <hdegoede@redhat.com>,
	Alexander Kaplan <alex@nextthing.co>,
	Wynter Woods <wynter@nextthing.co>,
	Boris Brezillon <boris.brezillon@free-electrons.com>,
	Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
	Rob Clark <robdclark@gmail.com>, Daniel Vetter <daniel@ffwll.ch>
Subject: Re: [PATCH 04/19] clk: sunxi: Add TCON channel1 clock
Date: Mon, 9 Nov 2015 11:36:15 +0800	[thread overview]
Message-ID: <CAGb2v65MUrBKA=pAC95evdiSBMaewRcnLUhBcqCbx_Pc6Jutnw@mail.gmail.com> (raw)
In-Reply-To: <20151107000139.GP6114@lukather>

On Sat, Nov 7, 2015 at 8:01 AM, Maxime Ripard
<maxime.ripard@free-electrons.com> wrote:
> Hi,
>
> On Sat, Oct 31, 2015 at 05:53:26PM +0800, Chen-Yu Tsai wrote:
>> On Fri, Oct 30, 2015 at 10:20 PM, Maxime Ripard
>> <maxime.ripard@free-electrons.com> wrote:
>> > The TCON is a controller generating the timings to output videos signals,
>> > acting like both a CRTC and an encoder.
>> >
>> > It has two channels depending on the output, each channel being driven by
>> > its own clock (and own clock controller).
>> >
>> > Add a driver for the channel 1 clock.
>> >
>> > Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
>> > ---
>> >  drivers/clk/sunxi/Makefile             |   1 +
>> >  drivers/clk/sunxi/clk-sun4i-tcon-ch1.c | 167 +++++++++++++++++++++++++++++++++
>> >  2 files changed, 168 insertions(+)
>> >  create mode 100644 drivers/clk/sunxi/clk-sun4i-tcon-ch1.c
>>
>> According to the documents I have, this variant of the TCON clock
>> is specific to sun5i. On sun4i/sun7i, TCON CH1 clock has the same
>> layout as TCON CH0 and the other display clocks.
>
> At least for the A20, it's not true.
>
> Make sure you do not confuse LCD1 CH0 (p79, which is a channel 0
> clock), with LCD0 CH1 (p81, which is a channel 1 clock).

Right. The names are great for confusing the reader. :(

>> > +       sclk1_parents[0] = sclk2_name;
>> > +       sclk1_parents[1] = sclk2d2_name;
>>
>> Is there any need to expose these 2 clocks via DT using of_clk_add_provider?
>
> No, as far as I'm aware, there's no user external to this clock
> driver.
>
>> Note that these complex clock trees within a clock node breaks the
>> assigned-clock-parents mechanism, as you can no longer specify the output
>> clock's direct parents.
>
> There's no point of changing the parent either. Hardware blocks are
> always connected to the leaf clock (sclk1). We could also model it as
> an extra 1-bit divider, which would simplify a bit the logic though.

Probably not. You still have a gate to handle. It's just moving the
divider from 1 clock to the other. I think the current approach of
modeling it like the hardware is better.

About reparenting, what I meant was if sclk2 is not exposed through
of_clk_add_provider, then we can't do assigned-clocks stuff on it,
like setting a default parent or making each channel use a different
source pll.

What I'm saying is if it is not expected to work with another core
binding, we should probably note it somewhere.


Regards
ChenYu

WARNING: multiple messages have this Message-ID (diff)
From: Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>
To: Maxime Ripard
	<maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
Cc: Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>,
	Mike Turquette
	<mturquette-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>,
	Stephen Boyd <sboyd-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
	David Airlie <airlied-cv59FeDIM0c@public.gmane.org>,
	Thierry Reding
	<thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	devicetree <devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	linux-arm-kernel
	<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
	linux-kernel
	<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	linux-clk <linux-clk-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	dri-devel
	<dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org>,
	linux-sunxi <linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>,
	Laurent Pinchart
	<laurent.pinchart-ryLnwIuWjnjg/C1BVhZhaw@public.gmane.org>,
	Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	Alexander Kaplan <alex-MflLfwwFzuz+yO7R74ARew@public.gmane.org>,
	Wynter Woods <wynter-MflLfwwFzuz+yO7R74ARew@public.gmane.org>,
	Boris Brezillon
	<boris.brezillon-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>,
	Thomas Petazzoni
	<thomas.petazzoni-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>,
	Rob Clark <robdclark-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Daniel Vetter <daniel-/w4YWyX8dFk@public.gmane.org>
Subject: Re: [PATCH 04/19] clk: sunxi: Add TCON channel1 clock
Date: Mon, 9 Nov 2015 11:36:15 +0800	[thread overview]
Message-ID: <CAGb2v65MUrBKA=pAC95evdiSBMaewRcnLUhBcqCbx_Pc6Jutnw@mail.gmail.com> (raw)
In-Reply-To: <20151107000139.GP6114@lukather>

On Sat, Nov 7, 2015 at 8:01 AM, Maxime Ripard
<maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org> wrote:
> Hi,
>
> On Sat, Oct 31, 2015 at 05:53:26PM +0800, Chen-Yu Tsai wrote:
>> On Fri, Oct 30, 2015 at 10:20 PM, Maxime Ripard
>> <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org> wrote:
>> > The TCON is a controller generating the timings to output videos signals,
>> > acting like both a CRTC and an encoder.
>> >
>> > It has two channels depending on the output, each channel being driven by
>> > its own clock (and own clock controller).
>> >
>> > Add a driver for the channel 1 clock.
>> >
>> > Signed-off-by: Maxime Ripard <maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
>> > ---
>> >  drivers/clk/sunxi/Makefile             |   1 +
>> >  drivers/clk/sunxi/clk-sun4i-tcon-ch1.c | 167 +++++++++++++++++++++++++++++++++
>> >  2 files changed, 168 insertions(+)
>> >  create mode 100644 drivers/clk/sunxi/clk-sun4i-tcon-ch1.c
>>
>> According to the documents I have, this variant of the TCON clock
>> is specific to sun5i. On sun4i/sun7i, TCON CH1 clock has the same
>> layout as TCON CH0 and the other display clocks.
>
> At least for the A20, it's not true.
>
> Make sure you do not confuse LCD1 CH0 (p79, which is a channel 0
> clock), with LCD0 CH1 (p81, which is a channel 1 clock).

Right. The names are great for confusing the reader. :(

>> > +       sclk1_parents[0] = sclk2_name;
>> > +       sclk1_parents[1] = sclk2d2_name;
>>
>> Is there any need to expose these 2 clocks via DT using of_clk_add_provider?
>
> No, as far as I'm aware, there's no user external to this clock
> driver.
>
>> Note that these complex clock trees within a clock node breaks the
>> assigned-clock-parents mechanism, as you can no longer specify the output
>> clock's direct parents.
>
> There's no point of changing the parent either. Hardware blocks are
> always connected to the leaf clock (sclk1). We could also model it as
> an extra 1-bit divider, which would simplify a bit the logic though.

Probably not. You still have a gate to handle. It's just moving the
divider from 1 clock to the other. I think the current approach of
modeling it like the hardware is better.

About reparenting, what I meant was if sclk2 is not exposed through
of_clk_add_provider, then we can't do assigned-clocks stuff on it,
like setting a default parent or making each channel use a different
source pll.

What I'm saying is if it is not expected to work with another core
binding, we should probably note it somewhere.


Regards
ChenYu

WARNING: multiple messages have this Message-ID (diff)
From: wens@csie.org (Chen-Yu Tsai)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 04/19] clk: sunxi: Add TCON channel1 clock
Date: Mon, 9 Nov 2015 11:36:15 +0800	[thread overview]
Message-ID: <CAGb2v65MUrBKA=pAC95evdiSBMaewRcnLUhBcqCbx_Pc6Jutnw@mail.gmail.com> (raw)
In-Reply-To: <20151107000139.GP6114@lukather>

On Sat, Nov 7, 2015 at 8:01 AM, Maxime Ripard
<maxime.ripard@free-electrons.com> wrote:
> Hi,
>
> On Sat, Oct 31, 2015 at 05:53:26PM +0800, Chen-Yu Tsai wrote:
>> On Fri, Oct 30, 2015 at 10:20 PM, Maxime Ripard
>> <maxime.ripard@free-electrons.com> wrote:
>> > The TCON is a controller generating the timings to output videos signals,
>> > acting like both a CRTC and an encoder.
>> >
>> > It has two channels depending on the output, each channel being driven by
>> > its own clock (and own clock controller).
>> >
>> > Add a driver for the channel 1 clock.
>> >
>> > Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
>> > ---
>> >  drivers/clk/sunxi/Makefile             |   1 +
>> >  drivers/clk/sunxi/clk-sun4i-tcon-ch1.c | 167 +++++++++++++++++++++++++++++++++
>> >  2 files changed, 168 insertions(+)
>> >  create mode 100644 drivers/clk/sunxi/clk-sun4i-tcon-ch1.c
>>
>> According to the documents I have, this variant of the TCON clock
>> is specific to sun5i. On sun4i/sun7i, TCON CH1 clock has the same
>> layout as TCON CH0 and the other display clocks.
>
> At least for the A20, it's not true.
>
> Make sure you do not confuse LCD1 CH0 (p79, which is a channel 0
> clock), with LCD0 CH1 (p81, which is a channel 1 clock).

Right. The names are great for confusing the reader. :(

>> > +       sclk1_parents[0] = sclk2_name;
>> > +       sclk1_parents[1] = sclk2d2_name;
>>
>> Is there any need to expose these 2 clocks via DT using of_clk_add_provider?
>
> No, as far as I'm aware, there's no user external to this clock
> driver.
>
>> Note that these complex clock trees within a clock node breaks the
>> assigned-clock-parents mechanism, as you can no longer specify the output
>> clock's direct parents.
>
> There's no point of changing the parent either. Hardware blocks are
> always connected to the leaf clock (sclk1). We could also model it as
> an extra 1-bit divider, which would simplify a bit the logic though.

Probably not. You still have a gate to handle. It's just moving the
divider from 1 clock to the other. I think the current approach of
modeling it like the hardware is better.

About reparenting, what I meant was if sclk2 is not exposed through
of_clk_add_provider, then we can't do assigned-clocks stuff on it,
like setting a default parent or making each channel use a different
source pll.

What I'm saying is if it is not expected to work with another core
binding, we should probably note it somewhere.


Regards
ChenYu

  reply	other threads:[~2015-11-09  3:36 UTC|newest]

Thread overview: 167+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-10-30 14:20 [PATCH 00/19] drm: Add Allwinner A10 display engine support Maxime Ripard
2015-10-30 14:20 ` Maxime Ripard
2015-10-30 14:20 ` Maxime Ripard
2015-10-30 14:20 ` [PATCH 01/19] clk: sunxi: Add display clock Maxime Ripard
2015-10-30 14:20   ` Maxime Ripard
2015-10-30 14:20   ` Maxime Ripard
2015-10-30 21:29   ` Stephen Boyd
2015-10-30 21:29     ` Stephen Boyd
2015-11-06 23:39     ` Maxime Ripard
2015-11-06 23:39       ` Maxime Ripard
2015-11-06 23:39       ` Maxime Ripard
2015-11-12 20:31       ` Stephen Boyd
2015-11-12 20:31         ` Stephen Boyd
2015-11-19 15:42         ` Maxime Ripard
2015-11-19 15:42           ` Maxime Ripard
2015-11-19 15:42           ` Maxime Ripard
2015-10-31 10:28   ` Chen-Yu Tsai
2015-10-31 10:28     ` Chen-Yu Tsai
2015-10-31 10:28     ` Chen-Yu Tsai
2015-11-06 19:42     ` Maxime Ripard
2015-11-06 19:42       ` Maxime Ripard
2015-11-06 19:42       ` Maxime Ripard
2015-10-30 14:20 ` [PATCH 02/19] clk: sunxi: Add PLL3 clock Maxime Ripard
2015-10-30 14:20   ` Maxime Ripard
2015-10-30 14:20   ` Maxime Ripard
2015-10-30 21:32   ` Stephen Boyd
2015-10-30 21:32     ` Stephen Boyd
2015-10-30 21:32     ` Stephen Boyd
2015-10-30 14:20 ` [PATCH 03/19] clk: sunxi: Add TCON channel0 clock Maxime Ripard
2015-10-30 14:20   ` Maxime Ripard
2015-10-30 14:20   ` Maxime Ripard
2015-10-31 10:19   ` Chen-Yu Tsai
2015-10-31 10:19     ` Chen-Yu Tsai
2015-11-06 22:11     ` Maxime Ripard
2015-11-06 22:11       ` Maxime Ripard
2015-10-30 14:20 ` [PATCH 04/19] clk: sunxi: Add TCON channel1 clock Maxime Ripard
2015-10-30 14:20   ` Maxime Ripard
2015-10-30 14:20   ` Maxime Ripard
2015-10-30 21:37   ` Stephen Boyd
2015-10-30 21:37     ` Stephen Boyd
2015-11-07  0:11     ` Maxime Ripard
2015-11-07  0:11       ` Maxime Ripard
2015-11-07  0:11       ` Maxime Ripard
2015-10-31  9:53   ` Chen-Yu Tsai
2015-10-31  9:53     ` Chen-Yu Tsai
2015-10-31  9:53     ` Chen-Yu Tsai
2015-11-07  0:01     ` Maxime Ripard
2015-11-07  0:01       ` Maxime Ripard
2015-11-07  0:01       ` Maxime Ripard
2015-11-09  3:36       ` Chen-Yu Tsai [this message]
2015-11-09  3:36         ` Chen-Yu Tsai
2015-11-09  3:36         ` Chen-Yu Tsai
2015-11-19 15:35         ` Maxime Ripard
2015-11-19 15:35           ` Maxime Ripard
2015-10-30 14:20 ` [PATCH 05/19] clk: sunxi: add DRAM gates Maxime Ripard
2015-10-30 14:20   ` Maxime Ripard
2015-10-30 14:20   ` Maxime Ripard
2015-11-09  4:18   ` Chen-Yu Tsai
2015-11-09  4:18     ` Chen-Yu Tsai
2015-11-09  4:18     ` Chen-Yu Tsai
2015-11-13  8:08     ` Chen-Yu Tsai
2015-11-13  8:08       ` Chen-Yu Tsai
2015-11-13  8:08       ` Chen-Yu Tsai
2015-11-19 15:43       ` Maxime Ripard
2015-11-19 15:43         ` Maxime Ripard
2015-11-19 15:43         ` Maxime Ripard
2015-10-30 14:20 ` [PATCH 06/19] clk: sunxi: Add Allwinner R8 AHB gates support Maxime Ripard
2015-10-30 14:20   ` Maxime Ripard
2015-10-30 14:20   ` Maxime Ripard
2015-10-30 16:01   ` Chen-Yu Tsai
2015-10-30 16:01     ` Chen-Yu Tsai
2015-10-30 16:01     ` Chen-Yu Tsai
2015-10-30 16:33     ` Hans de Goede
2015-10-30 16:33       ` Hans de Goede
2015-10-30 16:33       ` Hans de Goede
2015-10-30 14:20 ` [PATCH 07/19] drm/panel: simple: Add timings for the Olimex LCD-OLinuXino-4.3TS Maxime Ripard
2015-10-30 14:20   ` Maxime Ripard
2015-10-30 14:20   ` Maxime Ripard
2015-10-30 17:32   ` Thierry Reding
2015-10-30 17:32     ` Thierry Reding
2015-10-30 17:32     ` Thierry Reding
2015-11-07  0:44     ` Maxime Ripard
2015-11-07  0:44       ` Maxime Ripard
2015-11-07  0:44       ` Maxime Ripard
2015-10-30 14:20 ` [PATCH 08/19] drm: Add Allwinner A10 Display Engine support Maxime Ripard
2015-10-30 14:20   ` Maxime Ripard
2015-10-30 14:20   ` Maxime Ripard
2015-10-30 14:44   ` Daniel Vetter
2015-10-30 14:44     ` Daniel Vetter
2015-11-11 22:14     ` Maxime Ripard
2015-11-11 22:14       ` Maxime Ripard
2015-11-11 22:14       ` Maxime Ripard
2015-11-16 15:04       ` Daniel Vetter
2015-11-16 15:04         ` Daniel Vetter
2015-11-16 15:04         ` Daniel Vetter
2015-10-30 14:20 ` [PATCH 09/19] drm: sun4i: Add DT bindings documentation Maxime Ripard
2015-10-30 14:20   ` Maxime Ripard
2015-10-30 14:20   ` Maxime Ripard
2015-10-30 16:40   ` Rob Herring
2015-10-30 16:40     ` Rob Herring
2015-10-30 16:40     ` Rob Herring
2015-10-30 17:37     ` Thierry Reding
2015-10-30 17:37       ` Thierry Reding
2015-10-30 17:37       ` Thierry Reding
2015-10-30 17:37       ` Thierry Reding
2015-11-01 14:28       ` Rob Herring
2015-11-01 14:28         ` Rob Herring
2015-11-01 14:28         ` Rob Herring
2015-11-01 14:28         ` Rob Herring
2015-11-06 22:32     ` Maxime Ripard
2015-11-06 22:32       ` Maxime Ripard
2015-11-06 22:32       ` Maxime Ripard
2015-11-06 22:32       ` Maxime Ripard
2015-10-30 14:20 ` [PATCH 10/19] drm: sun4i: Add RGB output Maxime Ripard
2015-10-30 14:20   ` Maxime Ripard
2015-10-30 14:20   ` Maxime Ripard
2015-10-30 14:20 ` [PATCH 11/19] drm: sun4i: Add composite output Maxime Ripard
2015-10-30 14:20   ` Maxime Ripard
2015-10-30 14:20   ` Maxime Ripard
2015-11-02  2:53   ` [linux-sunxi] " Jonathan Liu
2015-11-02  2:53     ` Jonathan Liu
2015-11-02  2:53     ` Jonathan Liu
2015-11-07  0:35     ` [linux-sunxi] " Maxime Ripard
2015-11-07  0:35       ` Maxime Ripard
2015-11-07  0:35       ` Maxime Ripard
2015-10-30 14:20 ` [PATCH 12/19] drm: sun4i: tv: Add PAL output standard Maxime Ripard
2015-10-30 14:20   ` Maxime Ripard
2015-10-30 14:20   ` Maxime Ripard
2015-10-30 14:20 ` [PATCH 13/19] drm: sun4i: tv: Add NTSC " Maxime Ripard
2015-10-30 14:20   ` Maxime Ripard
2015-10-30 14:20   ` Maxime Ripard
2015-10-30 14:21 ` [PATCH 14/19] ARM: sun5i: dt: Add pll3 and pll7 clocks Maxime Ripard
2015-10-30 14:21   ` Maxime Ripard
2015-10-30 14:21   ` Maxime Ripard
2015-11-09  4:24   ` Chen-Yu Tsai
2015-11-09  4:24     ` Chen-Yu Tsai
2015-11-09  4:24     ` Chen-Yu Tsai
2015-10-30 14:21 ` [PATCH 15/19] ARM: sun5i: dt: Add display and TCON clocks Maxime Ripard
2015-10-30 14:21   ` Maxime Ripard
2015-10-30 14:21   ` Maxime Ripard
2015-10-30 14:21 ` [PATCH 16/19] ARM: sun5i: dt: Add DRAM gates Maxime Ripard
2015-10-30 14:21   ` Maxime Ripard
2015-10-30 14:21   ` Maxime Ripard
2015-10-30 14:21 ` [PATCH 17/19] ARM: sun5i: dt: Add display blocks to the DTSI Maxime Ripard
2015-10-30 14:21   ` Maxime Ripard
2015-10-30 14:21   ` Maxime Ripard
2015-10-30 14:21 ` [PATCH 18/19] ARM: sun5i: r8: Add AHB gates " Maxime Ripard
2015-10-30 14:21   ` Maxime Ripard
2015-10-30 14:21   ` Maxime Ripard
2015-10-30 14:21 ` [PATCH 19/19] ARM: sun5i: chip: Enable the TV Encoder Maxime Ripard
2015-10-30 14:21   ` Maxime Ripard
2015-10-30 14:21   ` Maxime Ripard
2015-10-30 15:20   ` Chen-Yu Tsai
2015-10-30 15:20     ` Chen-Yu Tsai
2015-11-06 19:37     ` Maxime Ripard
2015-11-06 19:37       ` Maxime Ripard
2015-11-06 19:37       ` Maxime Ripard
2015-10-30 14:52 ` [PATCH 00/19] drm: Add Allwinner A10 display engine support Daniel Vetter
2015-10-30 14:52   ` Daniel Vetter
2015-10-30 14:52   ` Daniel Vetter
2015-11-12  5:12   ` Maxime Ripard
2015-11-12  5:12     ` Maxime Ripard
2015-11-12  5:12     ` Maxime Ripard
2015-10-30 15:02 ` Stefan Monnier
2015-11-09  3:43 ` Chen-Yu Tsai
2015-11-09  3:43   ` Chen-Yu Tsai
2015-11-09  3:43   ` Chen-Yu Tsai

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