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fpga-manager: altera-ps-spi: preserve nCONFIG state

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If the driver module is loaded when FPGA is configured, the FPGA
is reset because nconfig is pulled low (low-active gpio inited
with GPIOD_OUT_HIGH activates the signal which means setting its
value to low). Init nconfig with GPIOD_OUT_LOW to prevent this.

Signed-off-by: Anatolij Gustschin <[email protected]>
Acked-by: Alan Tull <[email protected]>
Signed-off-by: Moritz Fischer <[email protected]>
Cc: stable <[email protected]> # 4.14+
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Anatolij Gustschin 2018-04-15 11:33:08 -07:00 • committed by Greg Kroah-Hartman
commit 881c93c0fb
1 changed files with 1 additions and 1 deletions
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2
drivers/fpga/altera-ps-spi.c
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@ -249,7 +249,7 @@ static int altera_ps_probe(struct spi_device *spi)
conf->data = of_id->data;
conf->spi = spi;
conf->config = devm_gpiod_get(&spi->dev, "nconfig", GPIOD_OUT_HIGH);
conf->config = devm_gpiod_get(&spi->dev, "nconfig", GPIOD_OUT_LOW);
if (IS_ERR(conf->config)) {
dev_err(&spi->dev, "Failed to get config gpio: %ld\n",
PTR_ERR(conf->config));