From 7d0ec8b6f40b356f780b79de63eeafd6b907d68c Mon Sep 17 00:00:00 2001
From: Pelle Nilsson <per.nilsson@xelmo.com>
Date: Tue, 14 Apr 2015 15:40:17 +0200
Subject: [PATCH] spi: bitbang: Make setup_transfer() callback optional

Some controller drivers have no need of this callback (spi-altera even
causes a NULL pointer dereference because it doesn't register the callback,
falsely assuming that it is already optional).

Fixes: 30af9b558a56 ("spi/bitbang: Drop empty setup() functions")
Signed-off-by: Pelle Nilsson <per.nilsson@xelmo.com>
Reviewed-by: Ezequiel Garcia <ezequiel.garcia@vanguardiasur.com.ar>
Signed-off-by: Mark Brown <broonie@kernel.org>
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