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spi: bcm2835: Set controller max_speed_hz

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Set the struct spi_controller max_speed_hz. This is based on the
reported source clock frequency during probe. The maximum bus clock
is half the source clock (as per the code in bcm2835_spi_transfer_one).

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20210107164825.21919-1-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Richard Fitzgerald 2021-01-07 16:48:25 +00:00 committed by Mark Brown
parent 72366b3c53
commit c6892892a9
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1 changed files with 2 additions and 0 deletions
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2
drivers/spi/spi-bcm2835.c
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@ -1307,6 +1307,8 @@ static int bcm2835_spi_probe(struct platform_device *pdev)
return dev_err_probe(&pdev->dev, PTR_ERR(bs->clk),
"could not get clk\n");
ctlr->max_speed_hz = clk_get_rate(bs->clk) / 2;
bs->irq = platform_get_irq(pdev, 0);
if (bs->irq <= 0)
return bs->irq ? bs->irq : -ENODEV;