Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Unverified Commit abf3a49e authored by Maxime Chevallier's avatar Maxime Chevallier Committed by Mark Brown
Browse files

spi: a3700: Set frequency limits at startup 



Armada 3700 SPI controller has an internal clock divider which can
divide the parent clock frequency by up to 30.

This patch sets the limits in the spi_controller fields so that we can
detect when a non-supported frequency is requested by a device for a
transfer.

Signed-off-by: default avatarMaxime Chevallier <maxime.chevallier@smile.fr>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 44a5f423

drivers/spi/spi-armada-3700.c

+7 −0
Original line number Diff line number Diff line
@@ -27,6 +27,8 @@ 


#define DRIVER_NAME			"armada_3700_spi"



#define A3700_SPI_MAX_SPEED_HZ		100000000

#define A3700_SPI_MAX_PRESCALE		30

#define A3700_SPI_TIMEOUT		10



/* SPI Register Offest */
@@ -815,6 +817,11 @@ static int a3700_spi_probe(struct platform_device *pdev) 
		goto error;

	}



	master->max_speed_hz = min_t(unsigned long, A3700_SPI_MAX_SPEED_HZ,

					clk_get_rate(spi->clk));

	master->min_speed_hz = DIV_ROUND_UP(clk_get_rate(spi->clk),

						A3700_SPI_MAX_PRESCALE);



	ret = a3700_spi_init(spi);

	if (ret)

		goto error_clk;