linux-kernel - Re: [PATCH v3 1/2] DT: pinctrl: Add binding documentation for Spreadtrum pin controller

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Date:   Fri, 9 Jun 2017 08:44:20 -0500
From:   Rob Herring <robh@...nel.org>
To:     Baolin Wang <baolin.wang@...eadtrum.com>
Cc:     linus.walleij@...aro.org, mark.rutland@....com,
        linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, broonie@...nel.org,
        baolin.wang@...aro.org
Subject: Re: [PATCH v3 1/2] DT: pinctrl: Add binding documentation for
 Spreadtrum pin controller

On Tue, Jun 06, 2017 at 09:03:13PM +0800, Baolin Wang wrote:
> This patch adds the binding documentation for Spreadtrum SC9860 pin
> controller device.

For the subject:  "dt-bindings: pinctrl: Add Spreadtrum SC9860 pin 
controller"

> 
> Signed-off-by: Baolin Wang <baolin.wang@...eadtrum.com>
> ---
> Changes since v2:
>  - No updates.
> 
> Changes since v1:
>  - Remove magic numbers and get to use the standard bindings.
>  - Fix some typos.
> ---
>  .../devicetree/bindings/pinctrl/sprd,pinctrl.txt   |   56 +++++++++++++++++
>  .../bindings/pinctrl/sprd,sc9860-pinctrl.txt       |   66 ++++++++++++++++++++
>  2 files changed, 122 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/pinctrl/sprd,pinctrl.txt
>  create mode 100644 Documentation/devicetree/bindings/pinctrl/sprd,sc9860-pinctrl.txt
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/sprd,pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/sprd,pinctrl.txt
> new file mode 100644
> index 0000000..2f544cd
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/sprd,pinctrl.txt
> @@ -0,0 +1,56 @@
> +* Spreadtrum Pin Controller
> +
> +The Spreadtrum pin controller are organized in 3 blocks (types).
> +
> +The first block comprises some global control registers, and each
> +register contains several bit fields with one bit or several bits
> +to configure for some global common configuration, such as domain
> +pad driving level, system control select and so on. We recognise
> +every fields comprising one bit or several bits in one global control
> +register as one pin, thus we should record every pin's bit offset,
> +bit width and register offset to configure this field (pin). Since
> +this type pins' configuration are very tricky and different for each
> +register, we introduce "sprd,ctrl" property to set the various global
> +control configuration.
> +
> +The second block comprises some common registers which have unified
> +register definition, and each register described one pin is used
> +to configure the pin sleep mode and function select. Now we have 4
> +systems on SC9860 SoC: AP system, PUBCP system, TGLDSP system and
> +AGDSP system. In some situation we have some pin-sleep related
> +configuration need to set when one of system goes into deep sleep
> +mode. For example, if we set the pin sleep mode as AP_SLEEP, which
> +means when AP system goes into deep sleep mode, this pin's sleep
> +related properties (input/output or pullup/down) will be set
> +automatically. Thus we intoduce "sprd,sleep_mode" to set pin sleep
> +mode.
> +
> +The last block comprises some misc registers which also have unified
> +register definition, and each register described one pin is used to
> +configure drive strength, pull up/down and so on. Especially for pull
> +up, we introduce "sprd,pullup" property for two kind configuration:
> +PULLUP_20K or PULLUP_4_7K, which means the pullup resistor is 20K or
> +4.7K.
> +
> +Required properties for Spreadtrum pin controller:
> +- compatible: "sprd,<soc>-pinctrl"
> +  Please refer to each sprd,<soc>-pinctrl.txt binding doc for supported SoCs.
> +- reg: The register address of pin controller device.
> +- pins : An array of pin names.
> +
> +Optional properties:
> +- function: Specified the function name.
> +- drive-strength: Drive strength in mA.
> +- input-schmitt-disable: Enable schmitt-trigger mode.
> +- input-schmitt-enable: Disable schmitt-trigger mode.
> +- bias-disable: Disable pin bias.
> +- bias-pull-down: Pull down on pin.
> +- sprd,ctrl: Control values referring to databook for global control pins.
> +- sprd,sleep_mode: Sleep mode selection.
> +- sprd,pullup: Pull up on pin.
> +- sprd,input-sleep: Input enable when system goes into deep sleep mode.
> +- sprd,output-sleep: Output enable when system goes into deep sleep mode.
> +- sprd,pullup_sleep: Pull up enable when system goes into deep sleep mode.
> +- sprd,pulldown_sleep: Pull down enable when system goes into deep sleep mode.
> +
> +Please refer to each sprd,<soc>-pinctrl.txt binding doc for supported values.
> diff --git a/Documentation/devicetree/bindings/pinctrl/sprd,sc9860-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/sprd,sc9860-pinctrl.txt
> new file mode 100644
> index 0000000..10b77e1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/sprd,sc9860-pinctrl.txt
> @@ -0,0 +1,66 @@
> +* Spreadtrum SC9860 Pin Controller
> +
> +Please refer to sprd,pinctrl.txt in this directory for common binding part
> +and usage.
> +
> +Required properties:
> +- compatible: Must be "sprd,sc9860-pinctrl".
> +- reg: The register address of pin controller device.
> +- pins : An array of strings, each string containing the name of a pin.
> +
> +Optional properties:
> +- function: A string containing the name of the function, values must be
> +  one of: "func1", "func2", "func3" and "func4".
> +- drive-strength: Drive strength in mA. Supported values: 2, 4, 6, 8, 10,
> +  12, 14, 16, 20, 21, 24, 25, 27, 29, 31 and 33.
> +- input-schmitt-disable: Enable schmitt-trigger mode.
> +- input-schmitt-enable: Disable schmitt-trigger mode.
> +- bias-disable: Disable pin bias.
> +- bias-pull-down: Pull down on pin.
> +- sprd,ctrl: Control values referring to databook for global control pins.
> +- sprd,sleep_mode: Choose the pin sleep mode, and supported values are:

sprd,sleep-mode

> +  AP_SLEEP, PUBCP_SLEEP, TGLDSP_SLEEP and AGDSP_SLEEP.
> +- sprd,pullup: Pull up on pin, the value should be PULLUP_20K or PULLUP_4_7K.

Different pull strengths is pretty commom. Seems like this should be a 
common property.

> +- sprd,input-sleep: Input enable when system goes into deep sleep mode.
> +- sprd,output-sleep: Output enable when system goes into deep sleep mode.

Seems like you would also need to define the state for output mode.

> +- sprd,pullup_sleep: Pull up enable when system goes into deep sleep mode.
> +- sprd,pulldown_sleep: Pull down enable when system goes into deep sleep mode.

s/_/-/

> +
> +Pin sleep mode definition:
> +enum pin_sleep_mode {
> +	AP_SLEEP = BIT(0),
> +	PUBCP_SLEEP = BIT(1),
> +	TGLDSP_SLEEP = BIT(2),
> +	AGDSP_SLEEP = BIT(3),
> +};
> +
> +Pin pullup mode definition:
> +enum pin_pullup_sel {
> +	PULLUP_20K,
> +	PULLUP_4_7K,
> +};
> +
> +Example:
> +pin_controller: pinctrl@...a0000 {
> +	compatible = "sprd,sc9860-pinctrl";
> +	reg = <0x402a0000 0x10000>;
> +
> +	grp1: sd0 {
> +		pins = "SC9860_VIO_SD2_IRTE", "SC9860_VIO_SD0_IRTE";
> +		sprd,ctrl = <0x1>;
> +	};
> +
> +	grp2: rfctl_33 {
> +		pins = "SC9860_RFCTL33";
> +		function = "func2";
> +		sprd,sleep_mode = <AP_SLEEP | PUBCP_SLEEP>;
> +		sprd,output-sleep;
> +	};
> +
> +	grp3: rfctl_misc_20 {
> +		pins = "SC9860_RFCTL20_MISC";
> +		drive-strength = <10>;
> +		sprd,pullup = <PULLUP_4_7K>;
> +		sprd,pullup-sleep;
> +	};
> +};
> -- 
> 1.7.9.5
>