linux-kernel - Re: [PATCH V3 1/4] dt-binding: Tegra194 pinctrl support

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Date:   Fri, 17 May 2019 17:03:56 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     Krishna Yarlagadda <kyarlagadda@...dia.com>,
        <linus.walleij@...aro.org>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <linux-kernel@...r.kernel.org>,
        <linux-gpio@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <devicetree@...r.kernel.org>
CC:     <pdeschrijver@...dia.com>, <josephl@...dia.com>,
        <smangipudi@...dia.com>, <ldewangan@...dia.com>
Subject: Re: [PATCH V3 1/4] dt-binding: Tegra194 pinctrl support

On 5/16/2019 5:23 PM, Krishna Yarlagadda wrote:
> Add binding doc for Tegra 194 pinctrl driver
> 
> Signed-off-by: Krishna Yarlagadda <kyarlagadda@...dia.com>
> ---
> Changes in V3:
> remove optional fields not supported by pins published here
> 
>   .../bindings/pinctrl/nvidia,tegra194-pinmux.txt    | 107 +++++++++++++++++++++
>   1 file changed, 107 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/pinctrl/nvidia,tegra194-pinmux.txt
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/nvidia,tegra194-pinmux.txt b/Documentation/devicetree/bindings/pinctrl/nvidia,tegra194-pinmux.txt
> new file mode 100644
> index 0000000..8763f44
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/nvidia,tegra194-pinmux.txt
> @@ -0,0 +1,107 @@
> +NVIDIA Tegra194 pinmux controller
> +
> +Required properties:
> +- compatible: "nvidia,tegra194-pinmux"
> +- reg: Should contain a list of base address and size pairs for:
> +  - first entry: The APB_MISC_GP_*_PADCTRL registers (pad control)
> +  - second entry: The PINMUX_AUX_* registers (pinmux)
> +
> +Please refer to pinctrl-bindings.txt in this directory for details of the
> +common pinctrl bindings used by client devices, including the meaning of the
> +phrase "pin configuration node".
> +
> +Tegra's pin configuration nodes act as a container for an arbitrary number of
> +subnodes. Each of these subnodes represents some desired configuration for a
> +pin, a group, or a list of pins or groups. This configuration can include the
> +mux function to select on those pin(s)/group(s), and various pin configuration
> +parameters, such as pull-up, tristate, drive strength, etc.
> +
> +See the TRM to determine which properties and values apply to each pin/group.
> +Macro values for property values are defined in
> +include/dt-binding/pinctrl/pinctrl-tegra.h.
> +
> +Required subnode-properties:
> +- nvidia,pins : An array of strings. Each string contains the name of a pin or
> +    group. Valid values for these names are listed below.
> +
> +Optional subnode-properties:
> +- nvidia,function: A string containing the name of the function to mux to the
> +    pin or group.
> +- nvidia,pull: Integer, representing the pull-down/up to apply to the pin.
> +    0: none, 1: down, 2: up.
> +- nvidia,tristate: Integer.
> +    0: drive, 1: tristate.
> +- nvidia,enable-input: Integer. Enable the pin's input path.
> +    enable :TEGRA_PIN_ENABLE and
> +    disable or output only: TEGRA_PIN_DISABLE.
> +- nvidia,open-drain: Integer.
> +    enable: TEGRA_PIN_ENABLE.
> +    disable: TEGRA_PIN_DISABLE.
> +- nvidia,lock: Integer. Lock the pin configuration against further changes
> +    until reset.
> +    enable: TEGRA_PIN_ENABLE.
> +    disable: TEGRA_PIN_DISABLE.
> +- nvidia,io-hv: Integer. Select high-voltage receivers.
> +    normal: TEGRA_PIN_DISABLE
> +    high: TEGRA_PIN_ENABLE
> +- nvidia,schmitt: Integer. Enables Schmitt Trigger on the input.
> +    normal: TEGRA_PIN_DISABLE
> +    high: TEGRA_PIN_ENABLE
> +- nvidia,drive-type: Integer. Valid range 0...3.
> +- nvidia,pull-down-strength: Integer. Controls drive strength. 0 is weakest.
> +    The range of valid values depends on the pingroup. See "CAL_DRVDN" in the
> +    Tegra TRM.
> +- nvidia,pull-up-strength: Integer. Controls drive strength. 0 is weakest.
> +    The range of valid values depends on the pingroup. See "CAL_DRVUP" in the
> +    Tegra TRM.
> +
> +Valid values for pin and group names (nvidia,pin) are:
> +
> +    These correspond to Tegra PADCTL_* (pinmux) registers.
> +
> +  Mux groups:
> +
> +    These correspond to Tegra PADCTL_* (pinmux) registers. Any property
> +    that exists in those registers may be set for the following pin names.
> +
> +    pex_l5_clkreq_n_pgg0, pex_l5_rst_n_pgg1
> +
> +  Drive groups:
> +
> +    These registers controls a single pin for which a mux group exists.
> +    See the list above for the pin name to use when configuring the pinmux.
> +
> +    pex_l5_clkreq_n_pgg0, pex_l5_rst_n_pgg1
> +
> +Valid values for nvidia,functions are:
> +
> +    pe5
> +
> +Power Domain:
> +    pex_l5_clkreq_n_pgg0 and pex_l5_rst_n_pgg1 are part of PCIE C5 power
> +    partition. Client devices must enable this partition before accessing
> +    these pins here.
> +
> +
> +Example:
> +
> +		tegra_pinctrl: pinmux: pinmux@...0000 {
> +			compatible = "nvidia,tegra194-pinmux";
> +			reg = <0x2430000 0x17000
> +			       0xc300000 0x4000>;
> +
> +			pinctrl-names = "pex_rst";
> +			pinctrl-0 = <&pex_rst_c5_out_state>;
> +
> +			pex_rst_c5_out_state: pex_rst_c5_out {
> +				pex_rst {
> +					nvidia,pins = "pex_l5_rst_n_pgg1";
> +					nvidia,schmitt = <TEGRA_PIN_DISABLE>;
> +					nvidia,lpdr = <TEGRA_PIN_ENABLE>;
> +					nvidia,enable-input = <TEGRA_PIN_DISABLE>;
> +					nvidia,io-high-voltage = <TEGRA_PIN_ENABLE>;
> +					nvidia,tristate = <TEGRA_PIN_DISABLE>;
> +					nvidia,pull = <TEGRA_PIN_PULL_NONE>;
> +				};
> +			};
> +		};
> 

Tested-by: Vidya Sagar <vidyas@...dia.com>