Unverified Commit 313d2c9d authored by Xianwei Zhao's avatar Xianwei Zhao Committed by Mark Brown
Browse files

spi: meson-spicc: add spicc loopback mode 



Add spicc loopback mode for debugging convenience.

Signed-off-by: default avatarSunny Luo <sunny.luo@amlogic.com>
Signed-off-by: default avatarXianwei Zhao <xianwei.zhao@amlogic.com>
Reviewed-by: default avatarNeil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20240612-spi_lbc-v1-1-d52e8c8011bd@amlogic.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 412a05d6

drivers/spi/spi-meson-spicc.c

+4 −2
Original line number Diff line number Diff line
@@ -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) |