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@xxxxxxxxxxxx>
Reviewed-by: Ray Jui <ray.jui@xxxxxxxxxxxx>
Reviewed-by: Scott Branden <scott.branden@xxxxxxxxxxxx>
---
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..79678c1 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@0x180a6000 {
+ compatible = "syscon";
+ reg = <0x180a6000 0xc30>;
+ };
+
touchscreen: tsc@180a6000 {
- 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
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