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spi: meson-spicc: add spicc loopback mode

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Add spicc loopback mode for debugging convenience.

Signed-off-by: Sunny Luo <sunny.luo@amlogic.com>
Signed-off-by: Xianwei Zhao <xianwei.zhao@amlogic.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20240612-spi_lbc-v1-1-d52e8c8011bd@amlogic.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Xianwei Zhao 2024-06-12 17:44:50 +08:00 committed by Mark Brown
parent 412a05d6a9
commit 313d2c9d12
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GPG Key ID: 24D68B725D5487D0
1 changed files with 4 additions and 2 deletions
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6
drivers/spi/spi-meson-spicc.c
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@ -514,7 +514,9 @@ static int meson_spicc_prepare_message(struct spi_controller *host,
/* Setup no wait cycles by default */
writel_relaxed(0, spicc->base + SPICC_PERIODREG);
writel_bits_relaxed(SPICC_LBC_W1, 0, spicc->base + SPICC_TESTREG);
writel_bits_relaxed(SPICC_LBC_W1,
spi->mode & SPI_LOOP ? SPICC_LBC_W1 : 0,
spicc->base + SPICC_TESTREG);
return 0;
}
@ -850,7 +852,7 @@ static int meson_spicc_probe(struct platform_device *pdev)
host->num_chipselect = 4;
host->dev.of_node = pdev->dev.of_node;
host->mode_bits = SPI_CPHA | SPI_CPOL | SPI_CS_HIGH;
host->mode_bits = SPI_CPHA | SPI_CPOL | SPI_CS_HIGH | SPI_LOOP;
host->bits_per_word_mask = SPI_BPW_MASK(32) |
SPI_BPW_MASK(24) |
SPI_BPW_MASK(16) |