linux-kernel - [PATCH v3 3/3] ARM: dts: use syscon in cygnus touchscreen dt node

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Date:	Mon, 22 Feb 2016 13:19:39 +0530
From:	Raveendra Padasalagi <raveendra.padasalagi@...adcom.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	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
Cc:	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,
	Raveendra Padasalagi <raveendra.padasalagi@...adcom.com>
Subject: [PATCH v3 3/3] ARM: dts: use syscon in cygnus touchscreen dt node

In Cygnus SOC touch screen controller registers are shared
with ADC and flex timer. Using readl/writel could lead to
race condition. So in such case register access is handled
through syscon framework API's in the touch screen driver.
This feature is enabled if "brcm,iproc-touchscreen-syscon"
compatible string is selected in touchscreen dt node.

So this patch enables syscon support in touchscreen driver
by adding necessary properties in touchscreen dt node.

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>
---
 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..1704dc0 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>;
 		};
 
+		ts_adc_syscon: ts_adc_syscon@...a6000 {
+			compatible = "brcm,iproc-ts-adc-syscon","syscon";
+			reg = <0x180a6000 0xc30>;
+		};
+
 		touchscreen: tsc@...a6000 {
-			compatible = "brcm,iproc-touchscreen";
-			reg = <0x180a6000 0x40>;
+			compatible = "brcm,iproc-touchscreen-syscon";
+			#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