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spi: stm32_qspi: Add reset support

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In some situation, QSPI controller is already configured by an early
boot stage, adding reset support will insure that QSPI controller is
started from a pristine state.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
This commit is contained in:
Patrice Chotard 2018-05-14 15:42:56 +02:00 committed by Jagan Teki
parent 2a6ca73691
commit 5e46123bf3
1 changed files with 15 additions and 0 deletions
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15
drivers/spi/stm32_qspi.c
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@ -12,6 +12,7 @@
#include <dm.h>
#include <errno.h>
#include <malloc.h>
#include <reset.h>
#include <spi.h>
#include <spi_flash.h>
#include <asm/io.h>
@ -457,6 +458,7 @@ static int stm32_qspi_probe(struct udevice *bus)
struct stm32_qspi_priv *priv = dev_get_priv(bus);
struct dm_spi_bus *dm_spi_bus;
struct clk clk;
struct reset_ctl reset_ctl;
int ret;
dm_spi_bus = bus->uclass_priv;
@ -484,6 +486,19 @@ static int stm32_qspi_probe(struct udevice *bus)
return priv->clock_rate;
}
ret = reset_get_by_index(bus, 0, &reset_ctl);
if (ret) {
if (ret != -ENOENT) {
dev_err(bus, "failed to get reset\n");
clk_disable(&clk);
return ret;
}
} else {
/* Reset QSPI controller */
reset_assert(&reset_ctl);
udelay(2);
reset_deassert(&reset_ctl);
}
setbits_le32(&priv->regs->cr, STM32_QSPI_CR_SSHIFT);