sh: add kycr2_delay for sh_keysc

After KYCR2 is set, udelay might become necessary if there are only a
small number of keys attached. This patch introduces an optional delay
through the platform data to address this problem.

Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/input/keyboard/sh_keysc.c b/drivers/input/keyboard/sh_keysc.c
index cea70e6a1031..68fd502fcfef 100644
--- a/drivers/input/keyboard/sh_keysc.c
+++ b/drivers/input/keyboard/sh_keysc.c
@@ -80,6 +80,9 @@ static irqreturn_t sh_keysc_isr(int irq, void *dev_id)
                 iowrite16(KYCR2_IRQ_LEVEL | (keyin_set << 8),
                           priv->iomem_base + KYCR2_OFFS);
 
+                if (pdata->kycr2_delay)
+                        udelay(pdata->kycr2_delay);
+
                 keys ^= ~0;
                 keys &= (1 << (sh_keysc_mode[pdata->mode].keyin *
                                sh_keysc_mode[pdata->mode].keyout)) - 1;