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spi: spi-fsl-lpspi: Read chip-select amount from hardware for i.MX93

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PARAM.PCSNUM register on i.MX93 indicates the number of supported
(hw) chip-selects. LPSPI4 has 3 while others have only 2.
Still allow overwriting from DT.

Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Link: https://lore.kernel.org/r/20230717085934.409476-3-alexander.stein@ew.tq-group.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Alexander Stein 2023-07-17 10:59:34 +02:00 committed by Mark Brown
parent dfc07ee62c
commit f46b06e62c
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GPG Key ID: 24D68B725D5487D0
1 changed files with 6 additions and 2 deletions
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8
drivers/spi/spi-fsl-lpspi.c
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@ -896,8 +896,12 @@ static int fsl_lpspi_probe(struct platform_device *pdev)
fsl_lpspi->txfifosize = 1 << (temp & 0x0f);
fsl_lpspi->rxfifosize = 1 << ((temp >> 8) & 0x0f);
if (of_property_read_u32((&pdev->dev)->of_node, "num-cs",
&num_cs))
num_cs = 1;
&num_cs)) {
if (of_device_is_compatible(pdev->dev.of_node, "fsl,imx93-spi"))
num_cs = ((temp >> 16) & 0xf);
else
num_cs = 1;
}
controller->bits_per_word_mask = SPI_BPW_RANGE_MASK(8, 32);
controller->transfer_one = fsl_lpspi_transfer_one;