linux-kernel - Re: [PATCH 1/2] dt-binding: Tegra194 pinctrl support

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Date:   Fri, 26 Apr 2019 15:05:37 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Krishna Yarlagadda <kyarlagadda@...dia.com>
Cc:     linus.walleij@...aro.org, jonathanh@...dia.com,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-tegra@...r.kernel.org, devicetree@...r.kernel.org,
        pdeschrijver@...dia.com, josephl@...dia.com, smangipudi@...dia.com,
        ldewangan@...dia.com, vidyas@...dia.com
Subject: Re: [PATCH 1/2] dt-binding: Tegra194 pinctrl support

On Fri, Apr 26, 2019 at 08:26:17AM +0530, Krishna Yarlagadda wrote:
> Add new compatible string and other fields used in pinctrl
> driver for Tegra194 in nvidia,tegra210-pinmux.txt
> 
> Signed-off-by: Krishna Yarlagadda <kyarlagadda@...dia.com>
> ---
>  .../bindings/pinctrl/nvidia,tegra210-pinmux.txt    | 43 +++++++++++++++++++---
>  1 file changed, 38 insertions(+), 5 deletions(-)

I think it'd make sense to create an nvidia,tegra194-pinmux.txt and just
duplicate the generic parts in this file. The bulk of the document is
about the specifics anyway and having a separate file makes it a little
cleaner and easier to read.

> diff --git a/Documentation/devicetree/bindings/pinctrl/nvidia,tegra210-pinmux.txt b/Documentation/devicetree/bindings/pinctrl/nvidia,tegra210-pinmux.txt
> index 85f2114..c4e802d 100644
> --- a/Documentation/devicetree/bindings/pinctrl/nvidia,tegra210-pinmux.txt
> +++ b/Documentation/devicetree/bindings/pinctrl/nvidia,tegra210-pinmux.txt
> @@ -1,7 +1,7 @@
> -NVIDIA Tegra210 pinmux controller
> +NVIDIA Tegra210/194 pinmux controller
>  
>  Required properties:
> -- compatible: "nvidia,tegra210-pinmux"
> +- compatible: "nvidia,tegra210-pinmux" or "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)
> @@ -83,6 +83,10 @@ Valid values for pin and group names (nvidia,pin) are:
>      These correspond to Tegra PINMUX_AUX_* (pinmux) registers. Any property
>      that exists in those registers may be set for the following pin names.
>  
> +  Tegra194:
> +    pex_l5_clkreq_n_pgg0, pex_l5_rst_n_pgg1
> +
> +  Tegra210:
>      In Tegra210, many pins also have a dedicated APB_MISC_GP_*_PADCTRL
>      register. Where that is true, and property that exists in that register
>      may also be set on the following pin names.
> @@ -127,12 +131,15 @@ Valid values for pin and group names (nvidia,pin) are:
>      registers. Note that where one of these registers controls a single pin
>      for which a PINMUX_AUX_* exists, see the list above for the pin name to
>      use when configuring the pinmux.
> -
> +  Tegra210:
>      pa6, pcc7, pe6, pe7, ph6, pk0, pk1, pk2, pk3, pk4, pk5, pk6, pk7, pl0, pl1,
>      pz0, pz1, pz2, pz3, pz4, pz5, sdmmc1, sdmmc2, sdmmc3, sdmmc4
> +  Tegra194:
> +    pex_l5_clkreq_n_pgg0, pex_l5_rst_n_pgg1
>  
>  Valid values for nvidia,functions are:
>  
> +  Tegra210:
>      aud, bcl, blink, ccla, cec, cldvfs, clk, core, cpu, displaya, displayb,
>      dmic1, dmic2, dmic3, dp, dtv, extperiph3, i2c1, i2c2, i2c3, i2cpmu, i2cvi,
>      i2s1, i2s2, i2s3, i2s4a, i2s4b, i2s5a, i2s5b, iqc0, iqc1, jtag, pe, pe0,
> @@ -140,9 +147,12 @@ Valid values for nvidia,functions are:
>      sdmmc1, sdmmc3, shutdown, soc, sor0, sor1, spdif, spi1, spi2, spi3, spi4,
>      sys, touch, uart, uarta, uartb, uartc, uartd, usb, vgp1, vgp2, vgp3, vgp4,
>      vgp5, vgp6, vimclk, vimclk2
> +  Tegra194:
> +    pe5
>  
> -Example:
> +Examples:
>  
> +  Tegra210:
>  	pinmux: pinmux@...00800 {
>  		compatible = "nvidia,tegra210-pinmux";
>  		reg = <0x0 0x700008d4 0x0 0x2a8>, /* Pad control registers */
> @@ -163,4 +173,27 @@ Example:
>  			};
>  		};
>  	};
> -};
> +
> +  Tegra194:
> +		tegra_pinctrl: pinmux: pinmux@...0000 {
> +			compatible = "nvidia,tegra194-pinmux";
> +			reg = <0x2430000 0x17000
> +			       0xc300000 0x4000>;
> +			#gpio-range-cells = <2>;
> +			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>;
> +				};
> +			};
> +		};
> +		pinmuxtest@0 {
> +			compatible = "nvidia,tegra194-pinmux-test";
> +			pinctrl-names = "pex_rst";
> +			pinctrl-0 = <&pex_rst_c5_out_state>;
> +		};

It's not clean to me what that pinmuxtest@0 node is there for. That
compatible string is not defined anywhere and nothing references the
state.

Wouldn't it make more sense to have an example similar to what we have
for Tegra210?

Thierry

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