From d7dbe2c78f74f1d6514b2ea4fc3f4740f01f70c5 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Lothar=20Wa=C3=9Fmann?= Date: Tue, 9 Sep 2014 13:26:02 +0200 Subject: [PATCH] ARM: dts: imx28-tx28: add spi-gpio as alternative for spi-mxs MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Shawn Guo --- arch/arm/boot/dts/imx28-tx28.dts | 54 ++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) diff --git a/arch/arm/boot/dts/imx28-tx28.dts b/arch/arm/boot/dts/imx28-tx28.dts index cfe6b3148dcc..81d4eb4220a5 100644 --- a/arch/arm/boot/dts/imx28-tx28.dts +++ b/arch/arm/boot/dts/imx28-tx28.dts @@ -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 = ; }; + 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 = ; + fsl,voltage = ; + fsl,pull-up = ; + }; + tx28_tsc2007_pins: tx28-tsc2007-pins { fsl,pinmux-ids = < MX28_PAD_SAIF0_MCLK__GPIO_3_20 /* TSC2007 IRQ */ -- 2.39.2