[PATCH] spi: meson-spicc: add spicc loopback mode
From: Xianwei Zhao via B4 Relay
Date: Wed Jun 12 2024 - 05:45:34 EST
From: Xianwei Zhao <xianwei.zhao@xxxxxxxxxxx>
Add spicc loopback mode for debugging convenience.
Signed-off-by: Sunny Luo <sunny.luo@xxxxxxxxxxx>
Signed-off-by: Xianwei Zhao <xianwei.zhao@xxxxxxxxxxx>
---
drivers/spi/spi-meson-spicc.c | 6 ++++--
1 file 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) |
---
base-commit: ec0d19f2b59699e2e148091debaa0d9d6af5800a
change-id: 20240611-spi_lbc-0859cebc580e
Best regards,
--
Xianwei Zhao <xianwei.zhao@xxxxxxxxxxx>