Device tree binding documentation for Broadcom NSP GPIO-a driver
Signed-off-by: Yendapally Reddy Dhananjaya Reddy <[email protected]>
---
.../devicetree/bindings/pinctrl/brcm,nsp-gpio.txt | 80 ++++++++++++++++++++++
1 file changed, 80 insertions(+)
create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt
diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt b/Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt
new file mode 100644
index 0000000..bea4211
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt
@@ -0,0 +1,80 @@
+Broadcom Northstar plus (NSP) GPIO/PINCONF Controller
+
+Required properties:
+- compatible:
+ Must be "brcm,nsp-gpio-a"
+
+- reg:
+ Should contain the register physical address and length for each of
+ GPIO base, IO control registers
+
+- #gpio-cells:
+ Must be two. The first cell is the GPIO pin number (within the
+ controller's pin space) and the second cell is used for the following:
+ bit[0]: polarity (0 for active high and 1 for active low)
+
+- gpio-controller:
+ Specifies that the node is a GPIO controller
+
+- ngpios:
+ Number of gpios supported (58x25 supports 32 and 58x23 supports 24)
+
+Optional properties:
+- interrupts:
+ Interrupt ID
+
+- interrupt-controller:
+ Specifies that the node is an interrupt controller
+
+- gpio-ranges:
+ Specifies the mapping between gpio controller and pin-controllers pins.
+ This requires 4 fields in cells defined as -
+ 1. Phandle of pin-controller.
+ 2. GPIO base pin offset.
+ 3 Pin-control base pin offset.
+ 4. number of gpio pins which are linearly mapped from pin base.
+
+Supported generic PINCONF properties in child nodes:
+- pins:
+ The list of pins (within the controller's own pin space) that properties
+ in the node apply to. Pin names are "gpio-<pin>"
+
+- bias-disable:
+ Disable pin bias
+
+- bias-pull-up:
+ Enable internal pull up resistor
+
+- bias-pull-down:
+ Enable internal pull down resistor
+
+- drive-strength:
+ Valid drive strength values include 2, 4, 6, 8, 10, 12, 14, 16 (mA)
+
+Example:
+
+ gpioa: gpio-a@18000020 {
+ compatible = "brcm,nsp-gpio-a";
+ reg = <0x18000020 0x100>,
+ <0x1803f1c4 0x1c>;
+ #gpio-cells = <2>;
+ gpio-controller;
+ ngpios = <32>;
+ gpio-ranges = <&pinctrl 0 0 31>;
+ interrupt-controller;
+ interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
+
+ /* Hog a few default settings */
+ pinctrl-names = "default";
+ pinctrl-0 = <&led>;
+ led: led {
+ pins = "gpio-1";
+ bias-pull-up;
+ };
+
+ pwr: pwr {
+ gpio-hog;
+ gpios = <3 1>;
+ output-high;
+ };
+ };
--
2.1.0
On Tue, Dec 01, 2015 at 11:46:38PM -0500, Yendapally Reddy Dhananjaya Reddy wrote:
> Device tree binding documentation for Broadcom NSP GPIO-a driver
Bindings are for h/w, not drivers...
>
> Signed-off-by: Yendapally Reddy Dhananjaya Reddy <[email protected]>
> ---
> .../devicetree/bindings/pinctrl/brcm,nsp-gpio.txt | 80 ++++++++++++++++++++++
> 1 file changed, 80 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt
>
> diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt b/Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt
> new file mode 100644
> index 0000000..bea4211
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt
> @@ -0,0 +1,80 @@
> +Broadcom Northstar plus (NSP) GPIO/PINCONF Controller
> +
> +Required properties:
> +- compatible:
> + Must be "brcm,nsp-gpio-a"
> +
> +- reg:
> + Should contain the register physical address and length for each of
> + GPIO base, IO control registers
> +
> +- #gpio-cells:
> + Must be two. The first cell is the GPIO pin number (within the
> + controller's pin space) and the second cell is used for the following:
> + bit[0]: polarity (0 for active high and 1 for active low)
> +
> +- gpio-controller:
> + Specifies that the node is a GPIO controller
> +
> +- ngpios:
> + Number of gpios supported (58x25 supports 32 and 58x23 supports 24)
2 chips? You should have 2 compatible strings. I think this is incorrect
use of ngpios which AIUI is not for how many lines there are, but how
many can be used (e.g. not reserved).
> +
> +Optional properties:
> +- interrupts:
> + Interrupt ID
> +
> +- interrupt-controller:
> + Specifies that the node is an interrupt controller
> +
> +- gpio-ranges:
> + Specifies the mapping between gpio controller and pin-controllers pins.
> + This requires 4 fields in cells defined as -
> + 1. Phandle of pin-controller.
> + 2. GPIO base pin offset.
> + 3 Pin-control base pin offset.
> + 4. number of gpio pins which are linearly mapped from pin base.
> +
> +Supported generic PINCONF properties in child nodes:
> +- pins:
> + The list of pins (within the controller's own pin space) that properties
> + in the node apply to. Pin names are "gpio-<pin>"
> +
> +- bias-disable:
> + Disable pin bias
> +
> +- bias-pull-up:
> + Enable internal pull up resistor
> +
> +- bias-pull-down:
> + Enable internal pull down resistor
> +
> +- drive-strength:
> + Valid drive strength values include 2, 4, 6, 8, 10, 12, 14, 16 (mA)
> +
> +Example:
> +
> + gpioa: gpio-a@18000020 {
node names are preferred to be generic, so just "gpio@..."
> + compatible = "brcm,nsp-gpio-a";
> + reg = <0x18000020 0x100>,
> + <0x1803f1c4 0x1c>;
> + #gpio-cells = <2>;
> + gpio-controller;
> + ngpios = <32>;
> + gpio-ranges = <&pinctrl 0 0 31>;
> + interrupt-controller;
> + interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
> +
> + /* Hog a few default settings */
> + pinctrl-names = "default";
> + pinctrl-0 = <&led>;
> + led: led {
> + pins = "gpio-1";
> + bias-pull-up;
> + };
> +
> + pwr: pwr {
> + gpio-hog;
> + gpios = <3 1>;
> + output-high;
> + };
> + };
> --
> 2.1.0
>
Hi Rob,
On 12/2/2015 7:07 AM, Rob Herring wrote:
> On Tue, Dec 01, 2015 at 11:46:38PM -0500, Yendapally Reddy Dhananjaya Reddy wrote:
>> Device tree binding documentation for Broadcom NSP GPIO-a driver
>
> Bindings are for h/w, not drivers...
>
>>
>> Signed-off-by: Yendapally Reddy Dhananjaya Reddy <[email protected]>
>> ---
>> .../devicetree/bindings/pinctrl/brcm,nsp-gpio.txt | 80 ++++++++++++++++++++++
>> 1 file changed, 80 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt
>>
>> diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt b/Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt
>> new file mode 100644
>> index 0000000..bea4211
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt
>> @@ -0,0 +1,80 @@
>> +Broadcom Northstar plus (NSP) GPIO/PINCONF Controller
>> +
>> +Required properties:
>> +- compatible:
>> + Must be "brcm,nsp-gpio-a"
>> +
>> +- reg:
>> + Should contain the register physical address and length for each of
>> + GPIO base, IO control registers
>> +
>> +- #gpio-cells:
>> + Must be two. The first cell is the GPIO pin number (within the
>> + controller's pin space) and the second cell is used for the following:
>> + bit[0]: polarity (0 for active high and 1 for active low)
>> +
>> +- gpio-controller:
>> + Specifies that the node is a GPIO controller
>> +
>> +- ngpios:
>> + Number of gpios supported (58x25 supports 32 and 58x23 supports 24)
>
> 2 chips? You should have 2 compatible strings. I think this is incorrect
> use of ngpios which AIUI is not for how many lines there are, but how
> many can be used (e.g. not reserved).
>
I believe this is the identical GPIO controller IP that is integrated
into two different SoC chip variants. The only difference is the
supported number of GPIO pins.
In this case, I believe this is what Linus prefers: 1) Using a single
compatible string (tied to the GPIO controller IP); 2) Addressing
difference in number of GPIOs using DT property 'ngpios'.
Thanks,
Ray
Hi Rob,
On 12/2/2015 8:37 PM, Rob Herring wrote:
> On Tue, Dec 01, 2015 at 11:46:38PM -0500, Yendapally Reddy Dhananjaya Reddy wrote:
>> Device tree binding documentation for Broadcom NSP GPIO-a driver
> Bindings are for h/w, not drivers...
Right, will address in the next patch.
>> Signed-off-by: Yendapally Reddy Dhananjaya Reddy <[email protected]>
>> ---
>> .../devicetree/bindings/pinctrl/brcm,nsp-gpio.txt | 80 ++++++++++++++++++++++
>> 1 file changed, 80 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt
>>
>> diff --git a/Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt b/Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt
>> new file mode 100644
>> index 0000000..bea4211
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/pinctrl/brcm,nsp-gpio.txt
>> @@ -0,0 +1,80 @@
>> +Broadcom Northstar plus (NSP) GPIO/PINCONF Controller
>> +
>> +Required properties:
>> +- compatible:
>> + Must be "brcm,nsp-gpio-a"
>> +
>> +- reg:
>> + Should contain the register physical address and length for each of
>> + GPIO base, IO control registers
>> +
>> +- #gpio-cells:
>> + Must be two. The first cell is the GPIO pin number (within the
>> + controller's pin space) and the second cell is used for the following:
>> + bit[0]: polarity (0 for active high and 1 for active low)
>> +
>> +- gpio-controller:
>> + Specifies that the node is a GPIO controller
>> +
>> +- ngpios:
>> + Number of gpios supported (58x25 supports 32 and 58x23 supports 24)
> 2 chips? You should have 2 compatible strings. I think this is incorrect
> use of ngpios which AIUI is not for how many lines there are, but how
> many can be used (e.g. not reserved).
>
>> +
>> +Optional properties:
>> +- interrupts:
>> + Interrupt ID
>> +
>> +- interrupt-controller:
>> + Specifies that the node is an interrupt controller
>> +
>> +- gpio-ranges:
>> + Specifies the mapping between gpio controller and pin-controllers pins.
>> + This requires 4 fields in cells defined as -
>> + 1. Phandle of pin-controller.
>> + 2. GPIO base pin offset.
>> + 3 Pin-control base pin offset.
>> + 4. number of gpio pins which are linearly mapped from pin base.
>> +
>> +Supported generic PINCONF properties in child nodes:
>> +- pins:
>> + The list of pins (within the controller's own pin space) that properties
>> + in the node apply to. Pin names are "gpio-<pin>"
>> +
>> +- bias-disable:
>> + Disable pin bias
>> +
>> +- bias-pull-up:
>> + Enable internal pull up resistor
>> +
>> +- bias-pull-down:
>> + Enable internal pull down resistor
>> +
>> +- drive-strength:
>> + Valid drive strength values include 2, 4, 6, 8, 10, 12, 14, 16 (mA)
>> +
>> +Example:
>> +
>> + gpioa: gpio-a@18000020 {
> node names are preferred to be generic, so just "gpio@..."
Right, will address in the next patch.
>> + compatible = "brcm,nsp-gpio-a";
>> + reg = <0x18000020 0x100>,
>> + <0x1803f1c4 0x1c>;
>> + #gpio-cells = <2>;
>> + gpio-controller;
>> + ngpios = <32>;
>> + gpio-ranges = <&pinctrl 0 0 31>;
>> + interrupt-controller;
>> + interrupts = <GIC_SPI 85 IRQ_TYPE_LEVEL_HIGH>;
>> +
>> + /* Hog a few default settings */
>> + pinctrl-names = "default";
>> + pinctrl-0 = <&led>;
>> + led: led {
>> + pins = "gpio-1";
>> + bias-pull-up;
>> + };
>> +
>> + pwr: pwr {
>> + gpio-hog;
>> + gpios = <3 1>;
>> + output-high;
>> + };
>> + };
>> --
>> 2.1.0
>>
Thanks
Dhananjay