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在spi1上加两个595，同spi4 一样的，怎么更改设备树呀？
spi4 { compatible = "spi-gpio"; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_spi4>; pinctrl-assert-gpios = <&gpio5 8 GPIO_ACTIVE_LOW>; status = "okay"; gpio-sck = <&gpio5 11 0>; gpio-mosi = <&gpio5 10 0>; cs-gpios = <&gpio5 7 0>; num-chipselects = <1>; #address-cells = <1>; #size-cells = <0>; gpio_spi: gpio_spi@0 { compatible = "fairchild,74hc595"; gpio-controller; #gpio-cells = <2>; reg = <0>; registers-number = <1>; registers-default = /bits/ 8 <0xa7>; spi-max-frequency = <100000>; }; }; registers-default = /bits/ 16 <0x00a7>; 因为我是两片，这个地方是不是要改成16？ 我用 cat /sys/kernel/debug/gpio，怎么是空的，查不到gpio root@freescale ~$ mount -t debugfs none /sys/kernel/debug root@freescale ~$ cat /sys/kernel/debug/gpio GPIOs 0-31, platform/209c000.gpio, 209c000.gpio: gpio-9 (led2 ) out lo gpio-19 (2190000.usdhc cd ) in hi GPIOs 32-63, platform/20a0000.gpio, 20a0000.gpio: GPIOs 64-95, platform/20a4000.gpio, 20a4000.gpio: gpio-66 (u***_otg1_vbus ) out lo GPIOs 96-127, platform/20a8000.gpio, 20a8000.gpio: GPIOs 128-159, platform/20ac000.gpio, 20ac000.gpio: gpio-128 (GTP RST PORT ) in hi gpio-129 (GTP INT IRQ ) in hi gpio-131 (? ) out lo gpio-133 (heartbeat ) out lo gpio-135 (spi32766.0 ) out lo gpio-136 (? ) out lo gpio-137 (led1 ) out lo gpio-138 (spi4.15 ) out lo gpio-139 (spi4.15 ) out lo 
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4个回答
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先参考应用笔记添加spi1，再参考spi4添加74hc595
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GPIOs 248-255, spi/spi32766.0, 74hc595, can sleep:
挂载后能看到GPIO的信息了，可我的SPI1下接的595没有看到，我的设备树是这样改的 spi4 { compatible = "spi-gpio"; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_spi4>; pinctrl-assert-gpios = <&gpio5 8 GPIO_ACTIVE_LOW>; //NOE status = "okay"; gpio-sck = <&gpio5 11 0>; //SHCP gpio-mosi = <&gpio5 10 0>; //SDI cs-gpios = <&gpio5 7 0>; //STCP num-chipselects = <1>; #address-cells = <1>; #size-cells = <0>; gpio_spi: gpio_spi@0 { compatible = "fairchild,74hc595"; gpio-controller; #gpio-cells = <2>; reg = <0>; registers-number = <1>; registers-default = /bits/ 8 <0xa7>; spi-max-frequency = <100000>; }; }; /*新增GPIO SPI1*/ spi1 { compatible = "spi-gpio"; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_spi1>; //pinctrl-assert-gpios = <&gpio5 8 GPIO_ACTIVE_LOW>; OE固定接低 status = "okay"; gpio-sck = <&gpio4 25 0>; gpio-mosi = <&gpio4 27 0>; cs-gpios = <&gpio4 26 0>; num-chipselects = <1>; #address-cells = <1>; #size-cells = <0>; gpio_spi1: gpio_spi1@0 { compatible = "fairchild,74hc595"; gpio-controller; #gpio-cells = <2>; reg = <0>; registers-number = <1>; registers-default = /bits/ 16 <0x00a7>; spi-max-frequency = <100000>; }; }; /*新增GPIO SPi1*/ pinctrl_spi1: spi1grp { fsl,pins = < MX6UL_PAD_CSI_DATA06__GPIO4_IO27 0x70a1 MX6UL_PAD_CSI_DATA05__GPIO4_IO26 0x70a1 MX6UL_PAD_CSI_DATA04__GPIO4_IO25 0x70a1 MX6UL_PAD_CSI_DATA07__GPIO4_IO28 0x70a1 >; }; |
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去掉SN74HC595芯片，以其中的修改为参考添加芯片
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