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From: Jean-Francois Moine <moinejf@free.fr>
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>,
	Jens Kuske <jenskuske@gmail.com>,
	Vishnu Patekar <vishnupatekar0510@gmail.com>,
	Hans de Goede <hdegoede@redhat.com>,
	linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org
Subject: Re: [PATCH v4] clk: sunxi: Refactor A31 PLL6 so that it can be reused
Date: Wed, 10 Feb 2016 18:04:20 +0100	[thread overview]
Message-ID: <20160210180420.0968c2018bf5fbe54a28a505@free.fr> (raw)
In-Reply-To: <20160210125333.GC31506@lukather>

On Wed, 10 Feb 2016 13:53:33 +0100
Maxime Ripard <maxime.ripard@free-electrons.com> wrote:

> > I don't agree:
> > - you changed the DTs of many SoCs without any valid reason,
>=20
> I did give you a significant number of reasons [1]. The fact that you
> chose to ignore them is up to you.

Sorry, I don't see any reason for changing the DT definition of the pll6.
The clock is named "pll6" with "#clock-cells =3D <1>;" in all DTs,
and it works as it is.
If you want an other clock as "pll8", with the same HW description,
you must add new code for this clock.

> Except that it doesn't match the hardware and that the parenthood
> relationship is inversed. The pll6 output is 24 MHz * n * k / 2, as
> seen in any datasheet that uses it. Your clock driver doesn't
> represent that fact.

The datasheet says that the pll6x2 output is 24 MHz * n * k, then, if
I remember correctly my lessons at primary school, defining pll6 as
(pll6x2 / 2) gives 24 MHz * n * k / 2 as the pll6 output. No?

--=20
Ken ar c'henta=F1	|	      ** Breizh ha Linux atav! **
Jef		|		http://moinejf.free.fr/

WARNING: multiple messages have this Message-ID (diff)
From: moinejf@free.fr (Jean-Francois Moine)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v4] clk: sunxi: Refactor A31 PLL6 so that it can be reused
Date: Wed, 10 Feb 2016 18:04:20 +0100	[thread overview]
Message-ID: <20160210180420.0968c2018bf5fbe54a28a505@free.fr> (raw)
In-Reply-To: <20160210125333.GC31506@lukather>

On Wed, 10 Feb 2016 13:53:33 +0100
Maxime Ripard <maxime.ripard@free-electrons.com> wrote:

> > I don't agree:
> > - you changed the DTs of many SoCs without any valid reason,
> 
> I did give you a significant number of reasons [1]. The fact that you
> chose to ignore them is up to you.

Sorry, I don't see any reason for changing the DT definition of the pll6.
The clock is named "pll6" with "#clock-cells = <1>;" in all DTs,
and it works as it is.
If you want an other clock as "pll8", with the same HW description,
you must add new code for this clock.

> Except that it doesn't match the hardware and that the parenthood
> relationship is inversed. The pll6 output is 24 MHz * n * k / 2, as
> seen in any datasheet that uses it. Your clock driver doesn't
> represent that fact.

The datasheet says that the pll6x2 output is 24 MHz * n * k, then, if
I remember correctly my lessons at primary school, defining pll6 as
(pll6x2 / 2) gives 24 MHz * n * k / 2 as the pll6 output. No?

-- 
Ken ar c'henta?	|	      ** Breizh ha Linux atav! **
Jef		|		http://moinejf.free.fr/

  reply	other threads:[~2016-02-10 17:04 UTC|newest]

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-02-01 20:20 [PATCH v4] clk: sunxi: Refactor A31 PLL6 so that it can be reused Maxime Ripard
2016-02-01 20:20 ` Maxime Ripard
2016-02-04 12:05 ` Maxime Ripard
2016-02-04 12:05   ` Maxime Ripard
2016-02-04 15:25   ` Jean-Francois Moine
2016-02-04 15:25     ` Jean-Francois Moine
2016-02-10 12:53     ` Maxime Ripard
2016-02-10 12:53       ` Maxime Ripard
2016-02-10 17:04       ` Jean-Francois Moine [this message]
2016-02-10 17:04         ` Jean-Francois Moine
2016-02-11  9:53         ` Maxime Ripard
2016-02-11  9:53           ` Maxime Ripard
2016-02-05 17:59 ` Andre Przywara
2016-02-05 17:59   ` Andre Przywara
2016-02-10 12:30   ` breaking DT compatibility (was: Re: [PATCH v4] clk: sunxi: Refactor A31 PLL6 so that it can be reused) Andre Przywara
2016-02-10 12:30     ` Andre Przywara
2016-02-10 13:42     ` Rob Herring
2016-02-10 13:42       ` Rob Herring
2016-02-10 14:37       ` Maxime Ripard
2016-02-10 14:37         ` Maxime Ripard
2016-02-10 14:45         ` Arnd Bergmann
2016-02-10 14:45           ` Arnd Bergmann
2016-02-10 14:45           ` Arnd Bergmann
2016-02-10 16:14         ` breaking DT compatibility Andre Przywara
2016-02-10 16:14           ` Andre Przywara
2016-02-11 10:16           ` Maxime Ripard
2016-02-11 10:16             ` Maxime Ripard
2016-02-10 16:30         ` breaking DT compatibility (was: Re: [PATCH v4] clk: sunxi: Refactor A31 PLL6 so that it can be reused) Mark Rutland
2016-02-10 16:30           ` Mark Rutland
2016-02-11 10:00           ` Maxime Ripard
2016-02-11 10:00             ` Maxime Ripard
2016-02-11 11:44             ` Mark Rutland
2016-02-11 11:44               ` Mark Rutland
2016-02-11 12:29               ` breaking DT compatibility Andre Przywara
2016-02-11 12:29                 ` Andre Przywara
2016-02-11 17:08               ` breaking DT compatibility (was: Re: [PATCH v4] clk: sunxi: Refactor A31 PLL6 so that it can be reused) Maxime Ripard
2016-02-11 17:08                 ` Maxime Ripard
2016-02-12  9:40                 ` Lucas Stach
2016-02-12  9:40                   ` Lucas Stach
2016-02-12  9:40                   ` Lucas Stach
2016-02-16  8:44                   ` Maxime Ripard
2016-02-16  8:44                     ` Maxime Ripard
2016-02-16 19:40                     ` Michael Turquette
2016-02-16 19:40                       ` Michael Turquette
2016-02-16 19:40                       ` Michael Turquette
2016-02-16 21:11                       ` Rob Herring
2016-02-11 14:51             ` Richard Cochran
2016-02-11 14:51               ` Richard Cochran
2016-02-11 15:16               ` breaking DT compatibility Andre Przywara
2016-02-11 15:16                 ` Andre Przywara
2016-02-11 21:46             ` breaking DT compatibility (was: Re: [PATCH v4] clk: sunxi: Refactor A31 PLL6 so that it can be reused) Rob Herring
2016-02-11 21:46               ` Rob Herring
2016-02-11 21:46               ` Rob Herring
2016-02-10 12:59   ` [PATCH v4] clk: sunxi: Refactor A31 PLL6 so that it can be reused Maxime Ripard
2016-02-10 12:59     ` Maxime Ripard
2016-02-10 14:02     ` Rob Herring
2016-02-10 14:02       ` Rob Herring
2016-02-11  9:41       ` Maxime Ripard
2016-02-11  9:41         ` Maxime Ripard
2016-02-10 18:41     ` Mark Rutland
2016-02-10 18:41       ` Mark Rutland

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