From: Philippe Schenker <philippe.schenker@toradex.com>
To: Mark Brown <broonie@kernel.org>,
"linux-spi@vger.kernel.org" <linux-spi@vger.kernel.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Clark Wang <xiaoning.wang@nxp.com>,
Philippe Schenker <philippe.schenker@toradex.com>
Subject: [PATCH] spi: fsl-lpspi: fix only one cs-gpio working
Date: Wed, 4 Dec 2019 14:13:33 +0000 [thread overview]
Message-ID: <20191204141312.1411251-1-philippe.schenker@toradex.com> (raw)
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>
---
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 2cc0ddb4a988..1375bdfc587b 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:
--
2.24.0
reply other threads:[~2019-12-04 14:14 UTC|newest]
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