linux-kernel - Re: [PATCH 4/4] ARM: dts: keystone-k2g-evm: Add gpio nodes

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Date:   Tue, 18 Jul 2017 14:13:42 -0500
From:   Suman Anna <s-anna@...com>
To:     Keerthy <j-keerthy@...com>, <linus.walleij@...aro.org>,
        <ssantosh@...nel.org>
CC:     <robh+dt@...nel.org>, <nsekhar@...com>, <fcooper@...com>,
        <linux-gpio@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] ARM: dts: keystone-k2g-evm: Add gpio nodes

Hi Keerthy,

On 07/18/2017 05:57 AM, Keerthy wrote:
> keystone-k2g has 2 instances of gpio. The first one has all the 144 GPIOs

Please use 66AK2G for keystone-k2g.

> functional( 9 banks with 16 gpios = 144). The second instance has
> only the GPIO0:GPIO67 functional and rest are marked reserved.
> 
> Signed-off-by: Keerthy <j-keerthy@...com>
> ---
>  arch/arm/boot/dts/keystone-k2g.dtsi | 42 +++++++++++++++++++++++++++++++++++++
>  1 file changed, 42 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/keystone-k2g.dtsi b/arch/arm/boot/dts/keystone-k2g.dtsi
> index bf4d1fa..58ac3db 100644
> --- a/arch/arm/boot/dts/keystone-k2g.dtsi
> +++ b/arch/arm/boot/dts/keystone-k2g.dtsi
> @@ -15,6 +15,7 @@
>  
>  #include <dt-bindings/interrupt-controller/arm-gic.h>
>  #include <dt-bindings/pinctrl/keystone.h>
> +#include <dt-bindings/gpio/gpio.h>
>  
>  / {
>  	compatible = "ti,k2g","ti,keystone";
> @@ -168,5 +169,46 @@
>  				#reset-cells = <2>;
>  			};
>  		};
> +
> +		gpio0: gpio@...3000 {
> +			compatible = "ti,keystone-k2g-gpio";
> +			reg = <0x02603000 0x100>;
> +			gpio-controller;
> +			#gpio-cells = <2>;
> +
> +			interrupts = <GIC_SPI 432 IRQ_TYPE_EDGE_RISING>,
> +					<GIC_SPI 433 IRQ_TYPE_EDGE_RISING>,
> +					<GIC_SPI 434 IRQ_TYPE_EDGE_RISING>,
> +					<GIC_SPI 435 IRQ_TYPE_EDGE_RISING>,
> +					<GIC_SPI 436 IRQ_TYPE_EDGE_RISING>,
> +					<GIC_SPI 437 IRQ_TYPE_EDGE_RISING>,
> +					<GIC_SPI 438 IRQ_TYPE_EDGE_RISING>,
> +					<GIC_SPI 439 IRQ_TYPE_EDGE_RISING>,
> +					<GIC_SPI 440 IRQ_TYPE_EDGE_RISING>;
> +			interrupt-controller;
> +			#interrupt-cells = <2>;
> +			ti,ngpio = <144>;
> +			ti,davinci-gpio-unbanked = <0>;
> +			clocks = <&k2g_clks 0x001b 0x0>;
> +			clock-names = "gpio";

I don't see the clocks and clock-names documented in the binding.
Looking at davinci_gpio_irq_setup(), these are required, and a specific
clock name is what the driver is looking for. And you have different
semantics for this on K2G and non-K2G SoCs. Davinci platforms are using
non-DT clocks, so their DT nodes didn't have them.

regards
Suman

> +		};
> +
> +		gpio1: gpio@...a000 {
> +			compatible = "ti,keystone-k2g-gpio";
> +			reg = <0x0260a000 0x100>;
> +			gpio-controller;
> +			#gpio-cells = <2>;
> +			interrupts = <GIC_SPI 442 IRQ_TYPE_EDGE_RISING>,
> +					<GIC_SPI 443 IRQ_TYPE_EDGE_RISING>,
> +					<GIC_SPI 444 IRQ_TYPE_EDGE_RISING>,
> +					<GIC_SPI 445 IRQ_TYPE_EDGE_RISING>,
> +					<GIC_SPI 446 IRQ_TYPE_EDGE_RISING>;
> +			interrupt-controller;
> +			#interrupt-cells = <2>;
> +			ti,ngpio = <68>;
> +			ti,davinci-gpio-unbanked = <0>;
> +			clocks = <&k2g_clks 0x001c 0x0>;
> +			clock-names = "gpio";
> +		};
>  	};
>  };
>