diff options
| author | Xianwei Zhao <xianwei.zhao@amlogic.com> | 2024-06-12 11:44:50 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2024-06-12 17:19:59 +0200 |
| commit | 313d2c9d1252185721cad4f8c57099840d6c9958 (patch) | |
| tree | 64c20634744d64247327ef88576295abdfe83426 /drivers/spi | |
| parent | spi: Rework DMA mapped flag (diff) | |
| download | linux-313d2c9d1252185721cad4f8c57099840d6c9958.tar.xz linux-313d2c9d1252185721cad4f8c57099840d6c9958.zip | |
spi: meson-spicc: add spicc loopback mode
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>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-meson-spicc.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/spi/spi-meson-spicc.c b/drivers/spi/spi-meson-spicc.c index 8a4a8ba9dfed..8838a98b04c2 100644 --- a/drivers/spi/spi-meson-spicc.c +++ b/drivers/spi/spi-meson-spicc.c @@ -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) | |