Add bindings to support SGPIO on AST2400 or AST2500.
Signed-off-by: Hongwei Zhang <[email protected]>
---
.../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)
+
+- 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
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 <[email protected]>
> ---
> .../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/bindings/gpio/gpio.txt?h=v5.2#n141
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
>
>
Hello Andrew,
Thanks for reviewing and please see my inline comments.
--Hongwei
> From: Andrew Jeffery <[email protected]>
> Sent: Wednesday, July 17, 2019 9:48 PM
> To: Hongwei Zhang; Joel Stanley; Linus Walleij; [email protected]
> Cc: Rob Herring; Mark Rutland; Bartosz Golaszewski; [email protected]; linux-
> [email protected]; [email protected]; [email protected]
> 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 <[email protected]>
> > ---
> > .../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
> >
> >