From: Siarhei Siamashka <siarhei.siamashka@gmail.com>
To: "André Przywara" <andre.przywara@arm.com>
Cc: Karsten Merker <merker@debian.org>,
Maxime Ripard <maxime.ripard@free-electrons.com>,
Chen-Yu Tsai <wens@csie.org>,
linux-sunxi@googlegroups.com, Arnd Bergmann <arnd@arndb.de>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org,
Linus Walleij <linus.walleij@linaro.org>,
Vishnu Patekar <vishnupatekar0510@gmail.com>,
linux-gpio@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
Pawel Moll <pawel.moll@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Kumar Gala <galak@codeaurora.org>,
devicetree@vger.kernel.org
Subject: Re: [linux-sunxi] Re: [PATCH 05/11] drivers: pinctrl: add driver for Allwinner A64 SoC
Date: Tue, 2 Feb 2016 03:58:52 +0200 [thread overview]
Message-ID: <20160202035852.6984db63@i7> (raw)
In-Reply-To: <56AFE0EC.8080207@arm.com>
On Mon, 1 Feb 2016 22:49:16 +0000
André Przywara <andre.przywara@arm.com> wrote:
> On 01/02/16 18:27, Karsten Merker wrote:
>
> Hi Karsten,
>
> thank you very much for your feedback!
>
> > On Mon, Feb 01, 2016 at 05:39:24PM +0000, Andre Przywara wrote:
> >> Based on the Allwinner A64 user manual and on the previous sunxi
> >> pinctrl drivers this introduces the pin multiplex assignments for
> >> the ARMv8 Allwinner A64 SoC.
> >> Port A is apparently used for the fixed function DRAM controller, so
> >> the ports start at B here (the manual mentions "n from 1 to 7", so
> >> not starting at 0).
> >>
> >> Signed-off-by: Andre Przywara <andre.przywara@arm.com>
> >> ---
> >> .../bindings/pinctrl/allwinner,sunxi-pinctrl.txt | 1 +
> >> arch/arm64/Kconfig.platforms | 1 +
> >> drivers/pinctrl/sunxi/Kconfig | 4 +
> >> drivers/pinctrl/sunxi/Makefile | 1 +
> >> drivers/pinctrl/sunxi/pinctrl-a64.c | 606 +++++++++++++++++++++
> >> 5 files changed, 613 insertions(+)
> >> create mode 100644 drivers/pinctrl/sunxi/pinctrl-a64.c
> >>
> >> diff --git a/Documentation/devicetree/bindings/pinctrl/allwinner,sunxi-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/allwinner,sunxi-pinctrl.txt
> >> index 9213b27..9050002 100644
> >> --- a/Documentation/devicetree/bindings/pinctrl/allwinner,sunxi-pinctrl.txt
> >> +++ b/Documentation/devicetree/bindings/pinctrl/allwinner,sunxi-pinctrl.txt
> >> @@ -21,6 +21,7 @@ Required properties:
> >> "allwinner,sun9i-a80-r-pinctrl"
> >> "allwinner,sun8i-a83t-pinctrl"
> >> "allwinner,sun8i-h3-pinctrl"
> >> + "allwinner,a64-pinctrl"
> >
> > Hello,
> >
> > on all other Allwinner SoCs we use the SoC family as part of the
> > compatible, as well as in the names of the Kconfig options. To
> > keep things consistent, I would like to propose doing the same on
> > Arm64, i.e. using allwinner,sun50i-a64-pinctrl instead of
> > allwinner,a64-pinctrl.
>
> Yes, I have been told this already. However I don't like this idea so
> much, for the following reasons:
> a) It is mostly redundant. The actual SoC (marketing) name is unique,
> there is no sun6i-a20 or sun7i-a23.
> b) It is not even helpful. If I got Maxime correctly, then the newer
> sunxi generation numbers depend on the ARM _cores_ used in the SoC,
> which is frankly the least interesting part from a Linux support
> perspective. I would see some sense if it would reflect the generation
> of IP blocks used, but so it is even more confusing to see that
> sun7i-a20 and sun8i-a23 are related, but sun8i-h3 is a completely
> different beast. The Allwinner marketing name tells you that, but the
> sunxi one does not.
> c) It is very confusing for people not dealing with it everyday. Just
> because I own a BananaPi I know that the A20 is sun7i, but I am totally
> lost when it comes to all the other names. And even now it took me about
> a minute to find the appropriate Wiki page which explains part of that
> story.
> d) Most importantly ;-): It kills TAB completion, unless you know the
> sunxi number, which is mostly not true as pointed out in c)
>
> So while I see that just a<somenumber> is not really very specific, I'd
> rather do away with current naming scheme for the future. In this
> particular case we have the vendor name as a name space identifier
> already, so there is no possible confusion with ARM Cortex naming, for
> instance.
>
> Also as this is now moving into the arm64 world, I'd like to use the
> opportunity to fix things that are not really optimal, the naming is one
> of them.
One of the problems is that A64 name is not unique. We have reasons
to believe that there are also H64 and R18 out there using exactly
the same die, but possibly available in different packaging (a different
ball grid pitch? or maybe a different set of peripherals routed to the
outside?). Early prototypes of the Pine64 board were using Allwinner R18
and the Jide Remix Mini HTPC box is using Allwinner H64.
The bootloader sources from Allwinner are also referring to A64 as
AW1689, which makes some sense because it is the chip id number that
is accessible for runtime identification via reading the SRAM_VER_REG
hardware register:
http://linux-sunxi.org/SRAM_Controller_Register_Guide#SRAM_VER_REG
So would it be a good idea to use "aw1689" as a compatible property
in the DT instead of "a64"? Or maybe have "aw1689-a64" and
"aw1689-h64", which would be similar to the existing "sun5i-a13"
and "sun5i-a10s" naming convention?
--
Best regards,
Siarhei Siamashka
next prev parent reply other threads:[~2016-02-02 1:58 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-01 17:39 [PATCH 00/11] arm64: Introduce Allwinner A64 and Pine64 support Andre Przywara
2016-02-01 17:39 ` [PATCH 01/11] irqchip: sun4i: fix compilation outside of arch/arm Andre Przywara
2016-02-02 14:51 ` [tip:irq/urgent] irqchip/sun4i: Fix compilation outside of arch/ arm tip-bot for Andre Przywara
2016-02-02 15:12 ` [PATCH 01/11] irqchip: sun4i: fix compilation outside of arch/arm Matthias Brugger
2016-02-02 15:32 ` Andre Przywara
2016-02-02 16:50 ` Matthias Brugger
2016-02-01 17:39 ` [PATCH 02/11] crypto: sunxi-ss: prevent compilation on 64-bit Andre Przywara
2016-02-02 3:16 ` Herbert Xu
2016-02-02 8:42 ` [linux-sunxi] " LABBE Corentin
2016-02-06 7:46 ` Herbert Xu
2016-02-01 17:39 ` [PATCH 03/11] drivers: rtc: allow compilation of sun6i RTC for all sunxi SoCs Andre Przywara
2016-02-02 9:44 ` Maxime Ripard
2016-02-04 22:58 ` Alexandre Belloni
2016-02-01 17:39 ` [PATCH 04/11] arm64: Introduce Allwinner SoC config option Andre Przywara
2016-02-02 15:20 ` Matthias Brugger
2016-02-02 15:30 ` Andre Przywara
2016-02-02 16:04 ` Arnd Bergmann
2016-02-01 17:39 ` [PATCH 05/11] drivers: pinctrl: add driver for Allwinner A64 SoC Andre Przywara
2016-02-01 18:27 ` Karsten Merker
2016-02-01 18:45 ` [linux-sunxi] " Karsten Merker
2016-02-01 23:02 ` André Przywara
2016-02-01 22:49 ` André Przywara
2016-02-02 1:58 ` Siarhei Siamashka [this message]
2016-02-02 14:24 ` [linux-sunxi] " Andre Przywara
2016-02-02 17:37 ` Maxime Ripard
2016-02-02 10:00 ` Maxime Ripard
2016-02-02 10:09 ` Chen-Yu Tsai
2016-02-02 16:53 ` Andre Przywara
2016-02-04 16:51 ` Maxime Ripard
2016-02-08 15:54 ` Rob Herring
2016-02-08 15:58 ` Andre Przywara
2016-02-09 17:12 ` Maxime Ripard
2016-02-01 17:39 ` [PATCH 06/11] clk: sunxi: add generic multi-parent bus clock gates driver Andre Przywara
2016-02-01 18:40 ` Jean-Francois Moine
2016-02-01 23:01 ` André Przywara
2016-02-01 17:39 ` [PATCH 07/11] clk: sunxi: add generic allwinner,sunxi name Andre Przywara
2016-02-08 15:57 ` Rob Herring
2016-02-08 16:06 ` Andre Przywara
2016-02-01 17:39 ` [PATCH 08/11] clk: sunxi: improve error reporting for the mux clock Andre Przywara
2016-02-02 18:02 ` Maxime Ripard
2016-02-02 18:05 ` Andre Przywara
2016-02-01 17:39 ` [PATCH 09/11] clk: sunxi: add critical-clocks property to mux clocks Andre Przywara
2016-02-01 17:39 ` [PATCH 10/11] arm64: dts: add Allwinner A64 SoC .dtsi Andre Przywara
2016-02-01 19:05 ` [linux-sunxi] " Karsten Merker
2016-02-01 23:03 ` André Przywara
2016-02-02 16:24 ` Jens Kuske
2016-02-02 16:46 ` Andre Przywara
2016-02-02 17:40 ` Jens Kuske
2016-02-05 8:55 ` Chen-Yu Tsai
2016-02-05 8:50 ` Maxime Ripard
2016-02-08 9:42 ` Andre Przywara
2016-02-23 18:45 ` Maxime Ripard
2016-02-01 17:39 ` [PATCH 11/11] arm64: dts: add Pine64 support Andre Przywara
2016-02-01 19:22 ` [linux-sunxi] " Karsten Merker
2016-02-01 23:04 ` André Przywara
2016-02-05 9:03 ` Maxime Ripard
2016-02-05 10:04 ` Andre Przywara
2016-02-08 0:55 ` [linux-sunxi] " Julian Calaby
2016-02-09 20:33 ` Danny Milosavljevic
2016-02-11 10:32 ` Maxime Ripard
2016-02-02 7:57 ` [PATCH 00/11] arm64: Introduce Allwinner A64 and " lists.nick.betteridge
2016-02-02 8:12 ` André Przywara
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