From 313d2c9d1252185721cad4f8c57099840d6c9958 Mon Sep 17 00:00:00 2001 From: Xianwei Zhao Date: Wed, 12 Jun 2024 17:44:50 +0800 Subject: spi: meson-spicc: add spicc loopback mode Add spicc loopback mode for debugging convenience. Signed-off-by: Sunny Luo Signed-off-by: Xianwei Zhao Reviewed-by: Neil Armstrong Link: https://lore.kernel.org/r/20240612-spi_lbc-v1-1-d52e8c8011bd@amlogic.com Signed-off-by: Mark Brown --- drivers/spi/spi-meson-spicc.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) (limited to 'drivers/spi') 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) | -- cgit v1.2.3