From: Philippe Schenker philippe.schenker@toradex.com
[ Upstream commit bc3a8b295e5bca9d1ec2622a6ba38289f9fd3d8a ]
Why it does not work at the moment: - num_chipselect sets the number of cs-gpios that are in the DT. This comes from drivers/spi/spi.c - num_chipselect gets set with devm_spi_register_controller, that is called in drivers/spi/spi.c - devm_spi_register_controller got called after num_chipselect has been used.
How this commit fixes the issue: - devm_spi_register_controller gets called before num_chipselect is being used.
Fixes: c7a402599504 ("spi: lpspi: use the core way to implement cs-gpio function") Signed-off-by: Philippe Schenker philippe.schenker@toradex.com Link: https://lore.kernel.org/r/20191204141312.1411251-1-philippe.schenker@toradex... Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/spi/spi-fsl-lpspi.c | 32 ++++++++++++++++---------------- 1 file changed, 16 insertions(+), 16 deletions(-)
diff --git a/drivers/spi/spi-fsl-lpspi.c b/drivers/spi/spi-fsl-lpspi.c index 2cc0ddb4a9889..1375bdfc587bf 100644 --- a/drivers/spi/spi-fsl-lpspi.c +++ b/drivers/spi/spi-fsl-lpspi.c @@ -862,6 +862,22 @@ static int fsl_lpspi_probe(struct platform_device *pdev) fsl_lpspi->dev = &pdev->dev; fsl_lpspi->is_slave = is_slave;
+ controller->bits_per_word_mask = SPI_BPW_RANGE_MASK(8, 32); + controller->transfer_one = fsl_lpspi_transfer_one; + controller->prepare_transfer_hardware = lpspi_prepare_xfer_hardware; + controller->unprepare_transfer_hardware = lpspi_unprepare_xfer_hardware; + controller->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; + controller->flags = SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX; + controller->dev.of_node = pdev->dev.of_node; + controller->bus_num = pdev->id; + controller->slave_abort = fsl_lpspi_slave_abort; + + ret = devm_spi_register_controller(&pdev->dev, controller); + if (ret < 0) { + dev_err(&pdev->dev, "spi_register_controller error.\n"); + goto out_controller_put; + } + if (!fsl_lpspi->is_slave) { for (i = 0; i < controller->num_chipselect; i++) { int cs_gpio = of_get_named_gpio(np, "cs-gpios", i); @@ -885,16 +901,6 @@ static int fsl_lpspi_probe(struct platform_device *pdev) controller->prepare_message = fsl_lpspi_prepare_message; }
- controller->bits_per_word_mask = SPI_BPW_RANGE_MASK(8, 32); - controller->transfer_one = fsl_lpspi_transfer_one; - controller->prepare_transfer_hardware = lpspi_prepare_xfer_hardware; - controller->unprepare_transfer_hardware = lpspi_unprepare_xfer_hardware; - controller->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; - controller->flags = SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX; - controller->dev.of_node = pdev->dev.of_node; - controller->bus_num = pdev->id; - controller->slave_abort = fsl_lpspi_slave_abort; - init_completion(&fsl_lpspi->xfer_done);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0); @@ -952,12 +958,6 @@ static int fsl_lpspi_probe(struct platform_device *pdev) if (ret < 0) dev_err(&pdev->dev, "dma setup error %d, use pio\n", ret);
- ret = devm_spi_register_controller(&pdev->dev, controller); - if (ret < 0) { - dev_err(&pdev->dev, "spi_register_controller error.\n"); - goto out_controller_put; - } - return 0;
out_controller_put: