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arm64: dts: hikey: listing spidev

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Listing spidev for SPI of Low-Speed (LS) expansion port on HiKey

To test SPI on HiKey, try the following steps:
1. Get latest spidev test
$ wget https://github.com/torvalds/linux/raw/master/tools/spi/spidev_test.c
$ gcc -O2 -o spidev_test spidev_test.c
2. run: modprobe spidev
3. short Pin SDO and SDI on HiKey LS port, for loop test
4. run: ./spidev_test -D /dev/spidev0.0
, and you will see something similar to:

spi mode: 0x0
bits per word: 8
max speed: 500000 Hz (500 KHz)
RX | FF FF FF FF FF FF 40 00 00 00 00 95 FF FF FF FF FF FF FF FF
     FF FF FF FF FF FF FF FF FF FF F0 0D  |
     ......@....�..................�.

Signed-off-by: Akira Tsukamoto <akira.tsukamoto@linaro.org>
Signed-off-by: Guodong Xu <guodong.xu@linaro.org>
[jstultz: fwdported to 4.9]
Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
Akira Tsukamoto
2015-12-31 15:55:24 +09:00
committed by John Stultz
parent ca54f88942
commit 64a7d387b2
2 changed files with 15 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/arm64/boot/dts/hisilicon/hi6220-hikey.dts
+13
View File
@@ -19,6 +19,7 @@
serial1 = &uart1; /* BT UART */
serial2 = &uart2; /* LS Expansion UART0 */
serial3 = &uart3; /* LS Expansion UART1 */
spi0 = &spi0;
};
chosen {
@@ -508,4 +509,16 @@
};
};
};
};
&spi0 {
#address-cells = <1>;
#size-cells = <0>;
status = "ok"
spidev@0 {
compatible = "linux,spidev";
spi-max-frequency = <500000>;
reg = <0>;
};
};
drivers/spi/spidev.c
+2 -2
View File
@@ -753,8 +753,8 @@ static int spidev_probe(struct spi_device *spi)
*/
if (spi->dev.of_node && !of_match_device(spidev_dt_ids, &spi->dev)) {
dev_err(&spi->dev, "buggy DT: spidev listed directly in DT\n");
WARN_ON(spi->dev.of_node &&
!of_match_device(spidev_dt_ids, &spi->dev));
// WARN_ON(spi->dev.of_node &&
// !of_match_device(spidev_dt_ids, &spi->dev));
}
spidev_probe_acpi(spi);