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Commit d7dbe2c7 authored by Lothar Waßmann's avatar Lothar Waßmann Committed by Shawn Guo
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ARM: dts: imx28-tx28: add spi-gpio as alternative for spi-mxs 



The spi-mxs driver does not allow full duplex SPI transfers. The
spi-gpio driver may be used as an alternative if this is required.

Make the choice between those drivers easier for the end user by
providing settings for both drivers.

Signed-off-by: default avatarLothar Waßmann <LW@KARO-electronics.de>
Signed-off-by: default avatarShawn Guo <shawn.guo@freescale.com>
parent 4d6480ac

arch/arm/boot/dts/imx28-tx28.dts

+54 −0
Original line number Diff line number Diff line
@@ -27,6 +27,8 @@ 
		lcdif = &lcdif;

		lcdif_23bit_pins = &tx28_lcdif_23bit_pins;

		lcdif_24bit_pins = &lcdif_24bit_pins_a;

		spi_gpio = &spi_gpio;

		spi_mxs = &ssp3;

		stk5led = &user_led;

		usbotg = &usb0;

	};
@@ -203,6 +205,44 @@ 
		col-scan-delay-us = <5000>;

		linux,no-autorepeat;

	};



	spi_gpio: spi-gpio {

		compatible = "spi-gpio";

		#address-cells = <1>;

		#size-cells = <0>;

		pinctrl-names = "default";

		pinctrl-0 = <&tx28_spi_gpio_pins>;



		gpio-sck = <&gpio2 24 GPIO_ACTIVE_HIGH>;

		gpio-mosi = <&gpio2 25 GPIO_ACTIVE_HIGH>;

		gpio-miso = <&gpio2 26 GPIO_ACTIVE_HIGH>;

		num-chipselects = <3>;

		cs-gpios = <

			&gpio2 27 GPIO_ACTIVE_LOW

			&gpio3 8 GPIO_ACTIVE_LOW

			&gpio3 9 GPIO_ACTIVE_LOW

		>;

		/* enable this and disable ssp3 below, if you need full duplex SPI transfer */

		status = "disabled";



		spi@0 {

			compatible = "spidev";

			reg = <0>;

			spi-max-frequency = <57600000>;

		};



		spi@1 {

			compatible = "spidev";

			reg = <1>;

			spi-max-frequency = <57600000>;

		};



		spi@2 {

			compatible = "spidev";

			reg = <2>;

			spi-max-frequency = <57600000>;

		};

	};

};



/* 2nd TX-Std UART - (A)UART1  */
@@ -558,6 +598,20 @@ 
		fsl,pull-up = <MXS_PULL_DISABLE>;

	};



	tx28_spi_gpio_pins: spi-gpiogrp {

		fsl,pinmux-ids = <

			MX28_PAD_AUART2_RX__GPIO_3_8

			MX28_PAD_AUART2_TX__GPIO_3_9

			MX28_PAD_SSP3_SCK__GPIO_2_24

			MX28_PAD_SSP3_MOSI__GPIO_2_25

			MX28_PAD_SSP3_MISO__GPIO_2_26

			MX28_PAD_SSP3_SS0__GPIO_2_27

		>;

		fsl,drive-strength = <MXS_DRIVE_8mA>;

		fsl,voltage = <MXS_VOLTAGE_HIGH>;

		fsl,pull-up = <MXS_PULL_DISABLE>;

	};



	tx28_tsc2007_pins: tx28-tsc2007-pins {

		fsl,pinmux-ids = <

			MX28_PAD_SAIF0_MCLK__GPIO_3_20 /* TSC2007 IRQ */