[PATCH 1/3] pinctrl: Broadcom NSP GPIO-a device tree bindings

[PATCH 1/3] pinctrl: Broadcom NSP GPIO-a device tree bindings

[Yendapally Reddy Dhananjaya Reddy]

Device tree binding documentation for Broadcom NSP GPIO-a driver

Signed-off-by: Yendapally Reddy Dhananjaya Reddy <yrdreddy@broadcom.com>
---
 .../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

Re: [PATCH 1/3] pinctrl: Broadcom NSP GPIO-a device tree bindings

[Rob Herring]

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 <yrdreddy@broadcom.com>
> ---
>  .../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
> 

Re: [PATCH 1/3] pinctrl: Broadcom NSP GPIO-a device tree bindings

[Ray Jui]

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 <yrdreddy@broadcom.com>
>> ---
>>   .../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

Re: [PATCH 1/3] pinctrl: Broadcom NSP GPIO-a device tree bindings

[Yendapally Reddy Dhananjaya Reddy]

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 <yrdreddy@broadcom.com>
>> ---
>>  .../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