SPI1 in Slave Mode

Buanderie · March 23, 2022, 10:50am

Hello !

I followed some instructions listed on the forum to switch SPI1 from master mode to slave mode on Jetson Nano, namely, replacing

nvidia,tegra210-spi

by

nvidia,tegra210-spi-slave

in the dts.

After the modification, every attempt at using spidev result in this error :

[ 63.242691] spi-tegra124-slave 7000d400.spi: clk_prepare failed: -22
[ 63.249389] spi-tegra124-slave 7000d400.spi: pm runtime failed, e = -22

Which would point to this :

github.com

antmicro/tx2-deep-learning-kit-bsp/blob/master/kernel/kernel-4.4/drivers/spi/spi-tegra124-slave.c#L1477


      
          	if (!cdata) {
          		cdata = tegra_spi_get_cdata_dt(spi, tspi);
          		spi->controller_data = cdata;
          	}
          
          	/* Set speed to the spi max fequency if spi device has not set */
          	spi->max_speed_hz = spi->max_speed_hz ? : tspi->spi_max_frequency;
          
          	ret = pm_runtime_get_sync(tspi->dev);
          	if (ret < 0) {
          		dev_err(tspi->dev, "pm runtime failed, e = %d\n", ret);
          		return ret;
          	}
          
          	spin_lock_irqsave(&tspi->lock, flags);
          	val = tspi->def_command1_reg;
          	if (spi->mode & SPI_CS_HIGH)
          		val &= ~cs_pol_bit[spi->chip_select];
          	else
          		val |= cs_pol_bit[spi->chip_select];

But that’s as far as I could go trying to understand this error… Any idea ?

ShaneCCC · March 24, 2022, 5:26am

What’s the BSP version?
There’s no problem for me with J4.6(r32.6.1)

Buanderie · March 24, 2022, 5:31am

I’m using L4T R32.4.3…

kayccc · April 13, 2022, 3:19am

Please help to move on new BSP. Thanks

system · May 4, 2022, 6:45am

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