From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from web112304.mail.gq1.yahoo.com (web112304.mail.gq1.yahoo.com [98.137.26.132]) by ozlabs.org (Postfix) with SMTP id 381BAB6F01 for ; Tue, 29 Dec 2009 00:23:29 +1100 (EST) Message-ID: <107858.98423.qm@web112304.mail.gq1.yahoo.com> References: Date: Mon, 28 Dec 2009 05:23:27 -0800 (PST) From: Jothi Adithya Subject: SPI - ADS7846 driver To: linuxppc-dev@lists.ozlabs.org In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="0-507734825-1262006607=:98423" List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , --0-507734825-1262006607=:98423 Content-Type: text/plain; charset=us-ascii Hi I am using Xilinx Virtex4 Powerpc. I am trying to interface with ADS7846 SPI touch screen controller. This is connected to the Xilinx SPI. The CS is connected to a GPIO & PEN_IRQ is connected to different GPIO. My DTS is //Chip Select 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 --0-507734825-1262006607=:98423 Content-Type: text/html; charset=us-ascii

Hi

I am using Xilinx Virtex4 Powerpc. I am trying to interface with ADS7846 SPI touch screen controller. This is connected to the Xilinx SPI. The CS is connected to a GPIO & PEN_IRQ is connected to different GPIO.

My DTS is

//Chip Select

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

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