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From: Matti Vaittinen <mazziesaccount@gmail.com>
To: Michael Walle <michael@walle.cc>, Drew Fustini <drew@beagleboard.org>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>,
	Rob Herring <robh+dt@kernel.org>,
	Linus Walleij <linus.walleij@linaro.org>,
	Bartosz Golaszewski <bgolaszewski@baylibre.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Michael Zhu <michael.zhu@starfivetech.com>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Fu Wei <tekkamanninja@gmail.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	"open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
	linux-riscv <linux-riscv@lists.infradead.org>,
	 devicetree <devicetree@vger.kernel.org>,
	Emil Renner Berthing <kernel@esmil.dk>,
	Huan Feng <huan.feng@starfivetech.com>
Subject: Re: [RFC PATH 2/2] gpio: starfive-jh7100: Add StarFive JH7100 GPIO driver
Date: Mon, 05 Jul 2021 17:33:10 +0300	[thread overview]
Message-ID: <68dc9bba14776ecd07d1b9e6fe53956b892a4b56.camel@gmail.com> (raw)
In-Reply-To: <991dddfee40c5b358c07257b58a316f3@walle.cc>

Hi deee Ho Drew, Michael, All

On Mon, 2021-07-05 at 15:29 +0200, Michael Walle wrote:
> Hi Drew,
> 
> Am 2021-07-02 23:06, schrieb Drew Fustini:
> > On Fri, Jul 02, 2021 at 07:03:19PM +0300, Andy Shevchenko wrote:
> > > On Thu, Jul 1, 2021 at 3:23 AM Drew Fustini <drew@beagleboard.org
> > > > 
> > > wrote:
> > > > Add GPIO driver for the StarFive JH7100 SoC [1] used on the
> > > > BeagleV Starlight JH7100 board [2].
> > > > 
> > > > [1] https://github.com/starfive-tech/beaglev_doc/
> > > > [2] https://github.com/beagleboard/beaglev-starlight
> > > > Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
> > > > Signed-off-by: Huan Feng <huan.feng@starfivetech.com>
> > > > Signed-off-by: Drew Fustini <drew@beagleboard.org>
> > > 
> > > Seems some Co-developed-by are missing.
> > 
> > Thank you for suggesting this.  Huan Feng originally wrote the
> > driver.
> > Emil and I have made some changes to reorganize and clean it up for
> > submission.
> > 
> > Do you think all three of us should list Co-developed-by: for our
> > names
> > in addition to the SOB?
> > 
> > > Brief look into the code brings the Q. Can't you utilize gpio-
> > > regmap
> > > here? Why not?
> > 
> > Michael Walle asked about this yesterday and it was my first time
> > looking at regmap and gpio-regmap.  I've been reading the code and
> > it
> > does look like I should try convert this driver over to using
> > gpio-regmap.
> > 
> > The open question in my mind is how to handle the interrupt type
> > (edge
> > trigged on positive or negative, level triggered on high or low).
> > Hopefully I can find some other examples that can help me think
> > about
> > how to do that correctly.

> regmap_irq_type".
> If you're lucky, you can just supply the corresponding values that
> fits
> your hardware.

I added some level IRQ type-configuration support to regmap_irq back
when I wrote the BD70528 support. You should be able to just fill the
bit-mask indicating IRQ types supported by your GPIO controller
hardware, and then the corresponding type register values. As far as I
remember the supported types and values are given "per IRQ". If my
memory serves me right there was a limitation that the regmap-IRQ does
not distinguish setup where GPIO controller supports rising and falling
edges - but not both. That would have required adding another type
flag.

>  If it doesn't match your hardware at all, then you can
> keep your own functions, or if its slightly different, then maybe you
> can add support for your quirk in regmap-irq. You don't necessarily
> have
> to use regmap-irq together with gpio-regmap. You can also just use
> regmap-irq or gpio-regmap independently.
> 
> A quick grep for "type_rising_" lists drivers/mfd/max77650.c and
> drivers/mfd/rohm-bd70528.c for example.

The BD70528 has not been used too much and is scheduled for removal. It
may have received only limited testing but it *should* be functional
though.

Best Regards
	Matti Vaittinen


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  reply	other threads:[~2021-07-05 14:33 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-01  0:20 [RFC PATH 0/2] gpio: starfive-jh7100: Add StarFive JH7100 GPIO bindings and driver Drew Fustini
2021-07-01  0:20 ` [RFC PATH 1/2] dt-bindings: gpio: add starfive,jh7100-gpio bindings Drew Fustini
2021-07-01  8:34   ` [RFC PATH 1/2] dt-bindings: gpio: add starfive, jh7100-gpio bindings Geert Uytterhoeven
2021-07-02 20:56     ` [RFC PATH 1/2] dt-bindings: gpio: add starfive,jh7100-gpio bindings Drew Fustini
2021-07-02 21:03       ` [RFC PATH 1/2] dt-bindings: gpio: add starfive, jh7100-gpio bindings Geert Uytterhoeven
2021-07-03  6:46         ` [RFC PATH 1/2] dt-bindings: gpio: add starfive,jh7100-gpio bindings Drew Fustini
2021-07-03  8:49           ` [RFC PATH 1/2] dt-bindings: gpio: add starfive, jh7100-gpio bindings Geert Uytterhoeven
2021-07-01  0:20 ` [RFC PATH 2/2] gpio: starfive-jh7100: Add StarFive JH7100 GPIO driver Drew Fustini
2021-07-01  2:25   ` Bin Meng
2021-07-01 20:44     ` Drew Fustini
2021-07-01  6:39   ` Michael Walle
2021-07-01 20:33     ` Drew Fustini
2021-07-02 14:59       ` Michael Walle
2021-07-02 21:00     ` Drew Fustini
2021-07-23 21:04     ` Linus Walleij
2021-07-26  7:11       ` Drew Fustini
2021-07-26  7:21         ` Michael Walle
2021-07-27  5:28           ` Drew Fustini
2021-07-28  9:49             ` Michael Walle
2021-07-28 10:59               ` Emil Renner Berthing
2021-07-28 11:19                 ` Michael Walle
2021-07-28 11:21                   ` Emil Renner Berthing
2021-07-02 16:03   ` Andy Shevchenko
2021-07-02 21:06     ` Drew Fustini
2021-07-05 13:29       ` Michael Walle
2021-07-05 14:33         ` Matti Vaittinen [this message]
2021-07-15  1:49   ` Ley Foon Tan

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