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[RFC,v1,3/3] spi: microchip-core-qspi: set min_speed_hz during probe

Message ID 20240612-attach-distaste-5c32099c1a76@spud (mailing list archive)
State New
Headers show
Series mmc-spi - support controllers incapable of getting as low as 400KHz | expand

Commit Message

Conor Dooley June 12, 2024, 3:48 p.m. UTC
From: Conor Dooley <conor.dooley@microchip.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

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


diff --git a/drivers/spi/spi-microchip-core-qspi.c b/drivers/spi/spi-microchip-core-qspi.c
index 1b23a38c155c..a549911b2f66 100644
--- a/drivers/spi/spi-microchip-core-qspi.c
+++ b/drivers/spi/spi-microchip-core-qspi.c
@@ -763,6 +763,7 @@  static int mchp_coreqspi_probe(struct platform_device *pdev)
 	ctlr->transfer_one_message = mchp_coreqspi_transfer_one_message;
 	ctlr->num_chipselect = 2;
 	ctlr->use_gpio_descriptors = true;
+	ctlr->min_speed_hz = clk_get_rate(qspi->clk) / 30;
 	ret = devm_spi_register_controller(&pdev->dev, ctlr);
 	if (ret)