linux-kernel - [PATCH] gpio: of: fix Freescale SPI CS quirk handling

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Message-Id: <20190816165000.32334-1-andreas@kemnade.info>
Date:   Fri, 16 Aug 2019 18:50:00 +0200
From:   Andreas Kemnade <andreas@...nade.info>
To:     linus.walleij@...aro.org, bgolaszewski@...libre.com,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        letux-kernel@...nphoenux.org, linux-spi@...r.kernel.org
Cc:     Andreas Kemnade <andreas@...nade.info>,
        "H . Nikolaus Schaller" <hns@...delico.com>
Subject: [PATCH] gpio: of: fix Freescale SPI CS quirk handling

On the gta04 we see:
spi_gpio: probe of spi_lcd failed with error -2

The quirk introduced in
commit e3023bf80639 ("gpio: of: Handle the Freescale SPI CS")
can also be triggered by a temporary -EPROBE_DEFER and
so "convert" it to a hard -ENOENT.

Disable that conversion by checking for -EPROBE_DEFER.

Fixes: e3023bf80639 ("gpio: of: Handle the Freescale SPI CS")
Suggested-by: H. Nikolaus Schaller <hns@...delico.com>
Signed-off-by: Andreas Kemnade <andreas@...nade.info>
---
 drivers/gpio/gpiolib-of.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index 567fb98c0892..9762dd6d99fa 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -363,7 +363,7 @@ struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id,
 	/* Special handling for SPI GPIOs if used */
 	if (IS_ERR(desc))
 		desc = of_find_spi_gpio(dev, con_id, &of_flags);
-	if (IS_ERR(desc)) {
+	if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER) {
 		/* This quirk looks up flags and all */
 		desc = of_find_spi_cs_gpio(dev, con_id, idx, flags);
 		if (!IS_ERR(desc))
-- 
2.20.1