linux-kernel - Re: [PATCH 3/4] ARM: dts: stm32: enable stmpe811 on stm32429-disco board

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Message-ID: <6e60c3494b7daea740b335fee9c5f5ce5ad7de45.camel@toradex.com>
Date:   Thu, 7 May 2020 08:32:52 +0000
From:   Philippe Schenker <philippe.schenker@...adex.com>
To:     "mcoquelin.stm32@...il.com" <mcoquelin.stm32@...il.com>,
        "dillon.minfei@...il.com" <dillon.minfei@...il.com>,
        "alexandre.torgue@...com" <alexandre.torgue@...com>
CC:     "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] ARM: dts: stm32: enable stmpe811 on stm32429-disco
 board

On Thu, 2020-05-07 at 15:47 +0800, dillon.minfei@...il.com wrote:
> From: dillon min <dillon.minfei@...il.com>
> 
> Enable the stmpe811 touch screen on stm32429-disco board.
> 
> Signed-off-by: dillon min <dillon.minfei@...il.com>
> ---
>  arch/arm/boot/dts/stm32f429-disco.dts | 50
> +++++++++++++++++++++++++++++++++++
>  1 file changed, 50 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/stm32f429-disco.dts
> b/arch/arm/boot/dts/stm32f429-disco.dts
> index 30c0f67..f9f21c8 100644
> --- a/arch/arm/boot/dts/stm32f429-disco.dts
> +++ b/arch/arm/boot/dts/stm32f429-disco.dts
> @@ -49,6 +49,8 @@
>  #include "stm32f429.dtsi"
>  #include "stm32f429-pinctrl.dtsi"
>  #include <dt-bindings/input/input.h>
> +#include <dt-bindings/interrupt-controller/irq.h>
> +#include <dt-bindings/gpio/gpio.h>
>  
>  / {
>  	model = "STMicroelectronics STM32F429i-DISCO board";
> @@ -127,3 +129,51 @@
>  	pinctrl-names = "default";
>  	status = "okay";
>  };
> +
> +&i2c3 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&i2c3_pins>;
> +	clock-frequency = <100000>;
> +	status = "okay";
> +
> +	stmpe811@41 {
> +		compatible = "st,stmpe811";
> +		reg = <0x41>;
> +		interrupts = <15 IRQ_TYPE_EDGE_FALLING>;
> +		interrupt-parent = <&gpioa>;
> +		id = <0>;
> +		blocks = <0x5>;
> +		irq-trigger = <0x1>;

I can't find id, blocks and irq-trigger in the binding. What are they
for?

Philippe

> +		/* 3.25 MHz ADC clock speed */
> +		st,adc-freq = <1>;
> +		/* 12-bit ADC */
> +		st,mod-12b = <1>;
> +		/* internal ADC reference */
> +		st,ref-sel = <0>;
> +		/* ADC converstion time: 80 clocks */
> +		st,sample-time = <4>;
> +
> +		stmpe_touchscreen {
> +			compatible = "st,stmpe-ts";
> +			/* 8 sample average control */
> +			st,ave-ctrl = <3>;
> +			/* 7 length fractional part in z */
> +			st,fraction-z = <7>;
> +			/*
> +			 * 50 mA typical 80 mA max touchscreen drivers
> +			 * current limit value
> +			 */
> +			st,i-drive = <1>;
> +			/* 1 ms panel driver settling time */
> +			st,settling = <3>;
> +			/* 5 ms touch detect interrupt delay */
> +			st,touch-det-delay = <5>;
> +		};
> +
> +		stmpe_adc {
> +			compatible = "st,stmpe-adc";
> +			/* forbid to use ADC channels 3-0 (touch) */
> +			st,norequest-mask = <0x0F>;
> +		};
> +	};
> +};