linux-kernel - Re: [PATCH v4 3/3] ARM: dts: use syscon in cygnus touchscreen dt node

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Date:	Wed, 6 Apr 2016 10:31:40 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Raveendra Padasalagi <raveendra.padasalagi@...adcom.com>
Cc:	Russell King <linux@....linux.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Arnd Bergmann <arnd@...db.de>, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-input@...r.kernel.org,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Jonathan Richardson <jonathar@...adcom.com>,
	Jon Mason <jonmason@...adcom.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Anup Patel <anup.patel@...adcom.com>,
	Ray Jui <rjui@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>,
	linux-kernel@...r.kernel.org, bcm-kernel-feedback-list@...adcom.com
Subject: Re: [PATCH v4 3/3] ARM: dts: use syscon in cygnus touchscreen dt node

On Sat, Feb 27, 2016 at 12:29:56PM +0530, Raveendra Padasalagi wrote:
> In Cygnus SOC touch screen controller registers are shared
> with ADC and flex timer. Using readl/writel could lead to
> race condition. So touchscreen driver is enhanced to support
> syscon based register access to take care of mutually exclusive
> access.
> 
> This patch enables syscon support in touchscreen driver
> by adding necessary properties in touchscreen dt node and
> in addition to this renamed existing "tsc" touchscreen node
> name to "touchscreen".
> 
> Signed-off-by: Raveendra Padasalagi <raveendra.padasalagi@...adcom.com>
> Reviewed-by: Ray Jui <ray.jui@...adcom.com>
> Reviewed-by: Scott Branden <scott.branden@...adcom.com>

OK, since the new dts is really needed for the driver I'll be folding
this into the touchscreen driver patch unless I hear someone yelling at
me.

Thanks!

> ---
>  arch/arm/boot/dts/bcm-cygnus.dtsi | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/bcm-cygnus.dtsi b/arch/arm/boot/dts/bcm-cygnus.dtsi
> index 3878793..b42fe55 100644
> --- a/arch/arm/boot/dts/bcm-cygnus.dtsi
> +++ b/arch/arm/boot/dts/bcm-cygnus.dtsi
> @@ -351,9 +351,16 @@
>  					<&pinctrl 142 10 1>;
>  		};
>  
> -		touchscreen: tsc@...a6000 {
> +		ts_adc_syscon: ts_adc_syscon@...a6000 {
> +			compatible = "brcm,iproc-ts-adc-syscon", "syscon";
> +			reg = <0x180a6000 0xc30>;
> +		};
> +
> +		touchscreen: touchscreen@...a6000 {
>  			compatible = "brcm,iproc-touchscreen";
> -			reg = <0x180a6000 0x40>;
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +			ts_syscon = <&ts_adc_syscon>;
>  			clocks = <&asiu_clks BCM_CYGNUS_ASIU_ADC_CLK>;
>  			clock-names = "tsc_clk";
>  			interrupts = <GIC_SPI 164 IRQ_TYPE_LEVEL_HIGH>;
> -- 
> 1.9.1
> 

-- 
Dmitry