From: Hongwei Zhang <hongweiz@ami.com>
To: <hongweiz@ami.com>, Andrew Jeffery <andrew@aj.id.au>,
Linus Walleij <linus.walleij@linaro.org>,
<linux-gpio@vger.kernel.org>
Cc: Joel Stanley <joel@jms.id.au>, <devicetree@vger.kernel.org>,
<linux-aspeed@lists.ozlabs.org>,
Bartosz Golaszewski <bgolaszewski@baylibre.com>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
<linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>
Subject: dt-bindings: gpio: aspeed: Add SGPIO support
Date: Fri, 19 Jul 2019 16:37:24 -0400 [thread overview]
Message-ID: <1563568644-10392-1-git-send-email-hongweiz@ami.com> (raw)
In-Reply-To: <1563394325-15941-1-git-send-email-hongweiz@ami.com>
Hello Andrew,
Thanks for reviewing and please see my inline comments.
--Hongwei
> From: Andrew Jeffery <andrew@aj.id.au>
> Sent: Wednesday, July 17, 2019 9:48 PM
> To: Hongwei Zhang; Joel Stanley; Linus Walleij; devicetree@vger.kernel.org
> Cc: Rob Herring; Mark Rutland; Bartosz Golaszewski; linux-aspeed@lists.ozlabs.org; linux-
> kernel@vger.kernel.org; linux-arm-kernel@lists.infradead.org; linux-gpio@vger.kernel.org
> Subject: Re: [PATCH 2/3 v4] dt-bindings: gpio: aspeed: Add SGPIO support
>
> The subject is largely correct, but please see the discussion on the driver patch about how to clean up
> the [PATCH ...] prefix.
>
> On Thu, 18 Jul 2019, at 05:42, Hongwei Zhang wrote:
> > Add bindings to support SGPIO on AST2400 or AST2500.
> >
> > Signed-off-by: Hongwei Zhang <hongweiz@ami.com>
> > ---
> > .../devicetree/bindings/gpio/sgpio-aspeed.txt | 55 ++++++++++++++++++++++
> > 1 file changed, 55 insertions(+)
> > create mode 100644
> > Documentation/devicetree/bindings/gpio/sgpio-aspeed.txt
> >
> > diff --git a/Documentation/devicetree/bindings/gpio/sgpio-aspeed.txt
> > b/Documentation/devicetree/bindings/gpio/sgpio-aspeed.txt
> > new file mode 100644
> > index 0000000..2d6305e
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/gpio/sgpio-aspeed.txt
> > @@ -0,0 +1,55 @@
> > +Aspeed SGPIO controller Device Tree Bindings
> > +-------------------------------------------
> > +
> > +This SGPIO controller is for ASPEED AST2500 SoC, it supports up to 80
> > full
> > +featured Serial GPIOs. Each of the Serial GPIO pins can be programmed
> > to
> > +support the following options:
> > +- Support interrupt option for each input port and various interrupt
> > + sensitivity option (level-high, level-low, edge-high, edge-low)
> > +- Support reset tolerance option for each output port
> > +- Directly connected to APB bus and its shift clock is from APB bus
> > clock
> > + divided by a programmable value.
> > +- Co-work with external signal-chained TTL components
> > +(74LV165/74LV595)
> > +
> > +
> > +Required properties:
> > +
> > +- compatible : Either "aspeed,ast2400-sgpio" or "aspeed,ast2500-sgpio"
> > +
> > +- #gpio-cells : Should be two
> > + - First cell is the GPIO line number
> > + - Second cell is used to specify optional
> > + parameters (unused)
> > +
> > +- reg : Address and length of the register set for the device
> > +- gpio-controller : Marks the device node as a GPIO controller
> > +- interrupts : Interrupt specifier (see interrupt bindings for
> > + details)
> > +
> > +- interrupt-controller : Mark the GPIO controller as an
> > interrupt-controller
> > +
> > +- nr-gpios : number of GPIO pins to serialise.
> > + (should be multiple of 8, up to 80 pins)
>
> Please change the property name to "ngpios", as per the generic GPIO bindings[1].
>
> [1]
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindi
> ngs/gpio/gpio.txt?h=v5.2#n141
done
>
> Cheers,
>
> Andrew
>
> > +
> > +- clocks : A phandle to the APB clock for SGPM clock
> > division
> > +
> > +- bus-frequency : SGPM CLK frequency
> > +
> > +
> > +The sgpio and interrupt properties are further described in their
> > respective bindings documentation:
> > +
> > +- Documentation/devicetree/bindings/sgpio/gpio.txt
> > +-
> > +Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
> > +
> > + Example:
> > + sgpio: sgpio@1e780200 {
> > + #gpio-cells = <2>;
> > + compatible = "aspeed,ast2500-sgpio";
> > + gpio-controller;
> > + interrupts = <40>;
> > + reg = <0x1e780200 0x0100>;
> > + clocks = <&syscon ASPEED_CLK_APB>;
> > + interrupt-controller;
> > + nr-gpios = <8>;
> > + bus-frequency = <12000000>;
> > + };
> > --
> > 2.7.4
> >
> >
prev parent reply other threads:[~2019-07-19 20:38 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-17 20:12 [PATCH 2/3 v4] dt-bindings: gpio: aspeed: Add SGPIO support Hongwei Zhang
2019-07-18 1:48 ` Andrew Jeffery
2019-07-19 20:37 ` Hongwei Zhang [this message]
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