linux-kernel - Re: [PATCH v4 3/7] ARM: dts: aspeed-g6: Add SGPIO node.

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Message-Id: <5277db96-4eb8-4794-a1fa-6a5bc40bffb7@www.fastmail.com>
Date:   Tue, 08 Jun 2021 08:58:42 +0930
From:   "Andrew Jeffery" <andrew@...id.au>
To:     "Steven Lee" <steven_lee@...eedtech.com>,
        "Linus Walleij" <linus.walleij@...aro.org>,
        "Bartosz Golaszewski" <bgolaszewski@...libre.com>,
        "Rob Herring" <robh+dt@...nel.org>,
        "Joel Stanley" <joel@....id.au>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-aspeed@...ts.ozlabs.org>,
        "open list" <linux-kernel@...r.kernel.org>
Cc:     "Hongwei Zhang" <Hongweiz@....com>,
        "Ryan Chen" <ryan_chen@...eedtech.com>,
        "Billy Tsai" <billy_tsai@...eedtech.com>
Subject: Re: [PATCH v4 3/7] ARM: dts: aspeed-g6: Add SGPIO node.

On Mon, 7 Jun 2021, at 16:45, Steven Lee wrote:
> AST2600 supports 2 SGPIO master interfaces one with 128 pins another one
> with 80 pins.
> 
> Signed-off-by: Steven Lee <steven_lee@...eedtech.com>
> ---
>  arch/arm/boot/dts/aspeed-g6.dtsi | 30 ++++++++++++++++++++++++++++++
>  1 file changed, 30 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/aspeed-g6.dtsi b/arch/arm/boot/dts/aspeed-g6.dtsi
> index f96607b7b4e2..c09b24824b6d 100644
> --- a/arch/arm/boot/dts/aspeed-g6.dtsi
> +++ b/arch/arm/boot/dts/aspeed-g6.dtsi
> @@ -377,6 +377,36 @@
>  				#interrupt-cells = <2>;
>  			};
>  
> +			sgpiom0: sgpiom@...80500 {
> +				#gpio-cells = <2>;
> +				gpio-controller;
> +				compatible = "aspeed,ast2600-sgpiom-128";
> +				reg = <0x1e780500 0x100>;
> +				interrupts = <GIC_SPI 51 IRQ_TYPE_LEVEL_HIGH>;
> +				ngpios = <128>;

Doesn't this affect the way the data is presented on the bus?

My understanding is this should be defined by each platform, not in the dtsi. Having said that, it appears it is specified in aspeed-g5.dtsi (as the value 8?).

> +				clocks = <&syscon ASPEED_CLK_APB2>;
> +				interrupt-controller;
> +				bus-frequency = <12000000>;
> +				pinctrl-names = "default";
> +				pinctrl-0 = <&pinctrl_sgpm1_default>;
> +				status = "disabled";
> +			};
> +
> +			sgpiom1: sgpiom@...80600 {
> +				#gpio-cells = <2>;
> +				gpio-controller;
> +				compatible = "aspeed,ast2600-sgpiom-80";
> +				reg = <0x1e780600 0x100>;
> +				interrupts = <GIC_SPI 70 IRQ_TYPE_LEVEL_HIGH>;
> +				ngpios = <80>;

As above.

Andrew