linux-kernel - [PATCH 6/6] fpga-manager: altera-ps-spi: preserve nCONFIG state

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Message-Id: <20180329153658.11614-7-mdf@kernel.org>
Date:   Thu, 29 Mar 2018 08:36:58 -0700
From:   Moritz Fischer <mdf@...nel.org>
To:     gregkh@...uxfoundation.org
Cc:     atull@...nel.org, linux-kernel@...r.kernel.org,
        linux-fpga@...r.kernel.org, Anatolij Gustschin <agust@...x.de>,
        Moritz Fischer <mdf@...nel.org>
Subject: [PATCH 6/6] fpga-manager: altera-ps-spi: preserve nCONFIG state

From: Anatolij Gustschin <agust@...x.de>

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 <agust@...x.de>
Signed-off-by: Alan Tull <atull@...nel.org>
Signed-off-by: Moritz Fischer <mdf@...nel.org>
---
 drivers/fpga/altera-ps-spi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/fpga/altera-ps-spi.c b/drivers/fpga/altera-ps-spi.c
index b061408bf0ae..250d9cf9bb1b 100644
--- a/drivers/fpga/altera-ps-spi.c
+++ b/drivers/fpga/altera-ps-spi.c
@@ -254,7 +254,7 @@ 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));
-- 
2.16.2