Hello Andrew, Thanks for reviewing and please see my inline comments. --Hongwei > From: Andrew Jeffery <andrew@xxxxxxxx> > Sent: Wednesday, July 17, 2019 9:48 PM > To: Hongwei Zhang; Joel Stanley; Linus Walleij; devicetree@xxxxxxxxxxxxxxx > Cc: Rob Herring; Mark Rutland; Bartosz Golaszewski; linux-aspeed@xxxxxxxxxxxxxxxx; linux- > kernel@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linux-gpio@xxxxxxxxxxxxxxx > 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@xxxxxxx> > > --- > > .../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 > > > >
