ath79 spi报错：ath79-spi 1f000000.spi: cs1 = max 1

一、问题及其解决方法

ath79 在dts中配置spi，固件启动后出错log如下：

[    0.374839] ath79-spi 1f000000.spi: cs1 >= max 1
[    0.379668] spi_master spi0: spi_device register error /ahb/spi@1f000000/flash@1
[    0.387309] spi_master spi0: Failed to create SPI device for /ahb/spi@1f000000/flash@1
[    0.406176] m25p80 spi0.0: w25q128 (16384 Kbytes)
[    0.411104] 6 fixed-partitions partitions found on MTD device spi0.0
[    0.417658] Creating 6 MTD partitions on "spi0.0":
[    0.422632] 0x000000000000-0x000000040000 : "u-boot"
[    0.428493] 0x000000040000-0x000000050000 : "u-boot-env"
[    0.434607] 0x000000050000-0x000000060000 : "art"
[    0.440165] 0x000000060000-0x000001000000 : "nor_firmware"
[    0.446436] 0x000000060000-0x000000460000 : "kernel"
[    0.452231] 0x000000460000-0x000001000000 : "nor_reserved"
[    0.459194] libphy: Fixed MDIO Bus: probed
[    1.138441] libphy: ag71xx_mdio: probed
[    1.145395] switch0: Atheros AR8337 rev. 2 switch registered on mdio-bus.0
[    1.799559] ag71xx 19000000.eth: connected to PHY at mdio-bus.0:00 [uid=004dd036, driver=Atheros AR8216/AR8236/AR8316]
[    1.811180] eth0: Atheros AG71xx at 0xb9000000, irq 4, mode: mii
[    1.819260] NET: Registered protocol family 10
[    1.827674] Segment Routing with IPv6
[    1.831590] NET: Registered protocol family 17
[    1.836223] 8021q: 802.1Q VLAN Support v1.8
[    1.844012] VFS: Cannot open root device "(null)" or unknown-block(0,0): error -6
[    1.851786] Please append a correct "root=" boot option; here are the available partitions:
[    1.860429] 1f00             256 mtdblock0
[    1.860433]  (driver?)
[    1.867184] 1f01              64 mtdblock1
[    1.867187]  (driver?)
[    1.873951] 1f02              64 mtdblock2
[    1.873954]  (driver?)
[    1.880724] 1f03           16000 mtdblock3
[    1.880728]  (driver?)
[    1.887478] 1f04            4096 mtdblock4
[    1.887481]  (driver?)
[    1.894245] 1f05           11904 mtdblock5
[    1.894248]  (driver?)
[    1.901017] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
[    1.910175] Rebooting in 1 seconds..

原因：
spi slave不识别。

解决方法：
修改dts中的spi

&spi {status = "okay";num-cs = <2>;     #两个spi slave,根据个人的硬件情况选cs-gpios = <0>, <0>;  #片选cs0与cs1为低电平有效.......
}

如cs-gpios = <0>, <0>, <&gpio1 18 GPIO_ACTIVE_LOW>;其中cs-gpios = <0>, <0>表示使用系统默认的cs0,与cs1低电平有效,而<&gpio1 18 GPIO_ACTIVE_LOW>表示cs2则绑定到gpio18，低电平有效

二、SPI知识拓展

CS: SPI从设备是否被选中的，只有片选信号为预先规定的使能信号时（高电位或低电位），对此 SPI 从设备的操作才有效。

通常使用如下图：一个从设备分配一根 SPI 的片选 CS 信号，常见的 SPI 从设备的片选信号为低电平选中设备，高电平释放设备。

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ath79 spi报错：ath79-spi 1f000000.spi: cs1 = max 1

一、问题及其解决方法

二、SPI知识拓展

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