SPI_CS: gpio@81400000 {

compatible = "xlnx,xps-gpio-1.00.a";

reg = < 0x81400000 0x10000 >;

xlnx,all-inputs = <0x0>;

xlnx,all-inputs-2 = <0x0>;

xlnx,dout-default = <0x0>;

xlnx,dout-default-2 = <0x0>;

xlnx,family = "virtex4";

xlnx,gpio-width = <0x4>;

xlnx,interrupt-present = <0x0>;

xlnx,is-bidir = <0x1>;

xlnx,is-bidir-2 = <0x1>;

xlnx,is-dual = <0x0>;

xlnx,tri-default = <0xffffffff>;

xlnx,tri-default-2 = <0xffffffff>;

} ;

               //Touch Screen (ADS7846) pen irq

 

               ts_pen_irq: gpio@81c00000 {

compatible = "xlnx,xps-gpio-1.00.a";

interrupt-parent = <&xps_intc_0>;

interrupts = < 0 2 >;

reg = < 0x81c00000 0x10000 >;

xlnx,all-inputs = <0x1>;

xlnx,all-inputs-2 = <0x0>;

xlnx,dout-default = <0x0>;

xlnx,dout-default-2 = <0x0>;

xlnx,family = "virtex4";

xlnx,gpio-width = <0x1>;

xlnx,interrupt-present = <0x1>;

xlnx,is-bidir = <0x1>;

xlnx,is-bidir-2 = <0x1>;

xlnx,is-dual = <0x0>;

xlnx,tri-default = <0xffffffff>;

xlnx,tri-default-2 = <0xffffffff>;

} ;

       

               // This is SPI

               xps_spi_ts: xps-spi@42400000 {

compatible = "xlnx,xps-spi-2.00.b", "xlnx,xps-spi-2.00.a";

reg = < 0x42400000 0x200 >;

xlnx,family = "virtex4";

xlnx,fifo-exist = <0x0>;

xlnx,num-ss-bits = <0x1>;

xlnx,num-transfer-bits = <0x8>;

xlnx,sck-ratio = <0xd0>;

} ;

          when I include the ADS7846 info in virtex.c file, the ADS7846 is detected & I could see at /dev/input/event0. But I do not know how to call or access the particluat GPIO in virtex.c file for Chipselect & for Irq.

         Please let me know how to do this