linux-kernel - [PATCH 4.4 284/342] spi: atmel: fix gpio chip-select in case of non-DT platform

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Date:	Tue, 01 Mar 2016 23:55:18 +0000
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	<linux-kernel@...r.kernel.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<stable@...r.kernel.org>, Mans Rullgard <mans@...sr.com>,
	Cyrille Pitchen <cyrille.pitchen@...el.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Mark Brown <broonie@...nel.org>
Subject: [PATCH 4.4 284/342] spi: atmel: fix gpio chip-select in case of non-DT platform

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Cyrille Pitchen <cyrille.pitchen@...el.com>

commit 70f340df24518d36eeaefb6652d492f250115c19 upstream.

The non-DT platform that uses this driver (actually the AVR32) was taking a bad
branch for determining if the IP would use gpio for CS.
Adding the presence of DT as a condition fixes this issue.

Fixes: 4820303480a1 ("spi: atmel: add support for the internal chip-select of the spi controller")
Reported-by: Mans Rullgard <mans@...sr.com>
Signed-off-by: Cyrille Pitchen <cyrille.pitchen@...el.com>
[nicolas.ferre@...el.com: extract from ml discussion]
Signed-off-by: Nicolas Ferre <nicolas.ferre@...el.com>
Tested-by: Mans Rullgard <mans@...sr.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/spi/spi-atmel.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -1571,6 +1571,7 @@ static int atmel_spi_probe(struct platfo
 
 	as->use_cs_gpios = true;
 	if (atmel_spi_is_v2(as) &&
+	    pdev->dev.of_node &&
 	    !of_get_property(pdev->dev.of_node, "cs-gpios", NULL)) {
 		as->use_cs_gpios = false;
 		master->num_chipselect = 4;