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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: Lothar Waßmann <LW@KARO-electronics.de>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>
This commit is contained in:
Lothar Waßmann 2014-09-09 13:26:02 +02:00 committed by Shawn Guo
parent 4d6480ac8c
commit d7dbe2c78f
1 changed files with 54 additions and 0 deletions
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54
arch/arm/boot/dts/imx28-tx28.dts
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@ -27,6 +27,8 @@ aliases {
lcdif = &lcdif; lcdif = &lcdif;
lcdif_23bit_pins = &tx28_lcdif_23bit_pins; lcdif_23bit_pins = &tx28_lcdif_23bit_pins;
lcdif_24bit_pins = &lcdif_24bit_pins_a; lcdif_24bit_pins = &lcdif_24bit_pins_a;
spi_gpio = &spi_gpio;
spi_mxs = &ssp3;
stk5led = &user_led; stk5led = &user_led;
usbotg = &usb0; usbotg = &usb0;
}; };
@ -203,6 +205,44 @@ &gpio5 7 GPIO_ACTIVE_HIGH
col-scan-delay-us = <5000>; col-scan-delay-us = <5000>;
linux,no-autorepeat; 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 */ /* 2nd TX-Std UART - (A)UART1 */
@ -558,6 +598,20 @@ MX28_PAD_PWM3__GPIO_3_28
fsl,pull-up = <MXS_PULL_DISABLE>; 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 { tx28_tsc2007_pins: tx28-tsc2007-pins {
fsl,pinmux-ids = < fsl,pinmux-ids = <
MX28_PAD_SAIF0_MCLK__GPIO_3_20 /* TSC2007 IRQ */ MX28_PAD_SAIF0_MCLK__GPIO_3_20 /* TSC2007 IRQ */