linux-kernel - [PATCH v2 1/3] spi: microchip-core-qspi: set min_speed

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Message-ID: <20250620-drained-widen-ac311bd5f172@spud>
Date: Fri, 20 Jun 2025 14:28:24 +0100
From: Conor Dooley <conor@...nel.org>
To: linux-spi@...r.kernel.org
Cc: conor@...nel.org,
	Conor Dooley <conor.dooley@...rochip.com>,
	Daire McNamara <daire.mcnamara@...rochip.com>,
	Mark Brown <broonie@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/3] spi: microchip-core-qspi: set min_speed_hz during probe

From: Conor Dooley <conor.dooley@...rochip.com>

The controller's minimum possible bus clock is 1/30 the rate of the
input clock. Naively set the minimum bus clock speed the controller
is capable of during probe, assuming that the rate will never reduce
further.

Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
---
 drivers/spi/spi-microchip-core-qspi.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/spi/spi-microchip-core-qspi.c b/drivers/spi/spi-microchip-core-qspi.c
index fa828fcaaef2d..111ae6519ff41 100644
--- a/drivers/spi/spi-microchip-core-qspi.c
+++ b/drivers/spi/spi-microchip-core-qspi.c
@@ -562,6 +562,7 @@ static int mchp_coreqspi_probe(struct platform_device *pdev)
 	ctlr->mode_bits = SPI_CPOL | SPI_CPHA | SPI_RX_DUAL | SPI_RX_QUAD |
 			  SPI_TX_DUAL | SPI_TX_QUAD;
 	ctlr->dev.of_node = np;
+	ctlr->min_speed_hz = clk_get_rate(qspi->clk) / 30;
 
 	ret = devm_spi_register_controller(&pdev->dev, ctlr);
 	if (ret)
-- 
2.45.2