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serial: sc16is7xx: set safe default SPI clock frequency

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[ Upstream commit 3ef79cd1412236d884ab0c46b4d1921380807b48 ]

15 MHz is supported only by 76x variants.

If the SPI clock frequency is not specified, use a safe default clock value
of 4 MHz that is supported by all variants.

Also use HZ_PER_MHZ macro to improve readability.

Fixes: 2c837a8a8f9f ("sc16is7xx: spi interface is added")
Cc:  <stable@vger.kernel.org>
Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Link: https://lore.kernel.org/r/20231221231823.2327894-4-hugo@hugovil.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit 5733959d6770324020e30dd9313cbeac0aec07ef)
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
This commit is contained in:
Hugo Villeneuve 2023-12-21 18:18:10 -05:00 committed by Vegard Nossum
parent a86917709d
commit 43f2c1d0c3
1 changed files with 2 additions and 1 deletions
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3
drivers/tty/serial/sc16is7xx.c
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@ -29,6 +29,7 @@
#include <linux/tty_flip.h>
#include <linux/spi/spi.h>
#include <linux/uaccess.h>
#include <linux/units.h>
#include <uapi/linux/sched/types.h>
#define SC16IS7XX_NAME "sc16is7xx"
@ -1403,7 +1404,7 @@ static int sc16is7xx_spi_probe(struct spi_device *spi)
spi->bits_per_word = 8;
/* only supports mode 0 on SC16IS762 */
spi->mode = spi->mode ? : SPI_MODE_0;
spi->max_speed_hz = spi->max_speed_hz ? : 15000000;
spi->max_speed_hz = spi->max_speed_hz ? : 4 * HZ_PER_MHZ;
ret = spi_setup(spi);
if (ret)
return ret;