linux-kernel - [PATCH] spi: meson-spicc: add spicc loopback mode

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Message-Id: <20240612-spi_lbc-v1-1-d52e8c8011bd@amlogic.com>
Date: Wed, 12 Jun 2024 17:44:50 +0800
From: Xianwei Zhao via B4 Relay <devnull+xianwei.zhao.amlogic.com@...nel.org>
To: Mark Brown <broonie@...nel.org>, 
 Neil Armstrong <neil.armstrong@...aro.org>, 
 Kevin Hilman <khilman@...libre.com>, Jerome Brunet <jbrunet@...libre.com>, 
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc: linux-spi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Sunny Luo <sunny.luo@...ogic.com>, Xianwei Zhao <xianwei.zhao@...ogic.com>
Subject: [PATCH] spi: meson-spicc: add spicc loopback mode

From: Xianwei Zhao <xianwei.zhao@...ogic.com>

Add spicc loopback mode for debugging convenience.

Signed-off-by: Sunny Luo <sunny.luo@...ogic.com>
Signed-off-by: Xianwei Zhao <xianwei.zhao@...ogic.com>
---
 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@...ogic.com>