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rockchip: spi: Honour the deactivation delay 

This is not currently implemented. Add support for this so that the Chrome
OS EC can be used on jerry.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2016-11-13 14:22:03 -07:00
parent 6e019c4f28
commit b42524744d
1 changed files with 8 additions and 0 deletions
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8
drivers/spi/rk_spi.c
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@ -110,6 +110,14 @@ static void spi_cs_activate(struct udevice *dev, uint cs)
struct rockchip_spi_priv *priv = dev_get_priv(bus);
struct rockchip_spi *regs = priv->regs;
/* If it's too soon to do another transaction, wait */
if (plat->deactivate_delay_us && priv->last_transaction_us) {
ulong delay_us; /* The delay completed so far */
delay_us = timer_get_us() - priv->last_transaction_us;
if (delay_us < plat->deactivate_delay_us)
udelay(plat->deactivate_delay_us - delay_us);
}
debug("activate cs%u\n", cs);
writel(1 << cs, &regs->ser);
if (plat->activate_delay_us)