[PATCH 1/2] gpio/gpio-generic: read set register for caching if available

[Sebastian Andrzej Siewior]

The ->data is a shadow copy which is used during the ->set callback in
order to avoid a read of the register before write.
If ->reg_set is set then we write to this location therefore we should
cache that value.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
---
 drivers/gpio/gpio-generic.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/drivers/gpio/gpio-generic.c b/drivers/gpio/gpio-generic.c
index 231714d..9f8b5c6 100644
--- a/drivers/gpio/gpio-generic.c
+++ b/drivers/gpio/gpio-generic.c
@@ -398,7 +398,10 @@ int __devinit bgpio_init(struct bgpio_chip *bgc,
 	if (ret)
 		return ret;
 
-	bgc->data = bgc->read_reg(bgc->reg_dat);
+	if (bgc->reg_set)
+		bgc->data = bgc->read_reg(bgc->reg_set);
+	else
+		bgc->data = bgc->read_reg(bgc->reg_dat);
 
 	return ret;
 }
-- 
1.7.4.4

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