Blackfin: BF51x/BF52x: support GPIO Hysteresis/Schmitt Trigger options

Newer parts have optional Hysteresis/Schmitt Trigger options to help with
dirty signals.  So add some kconfig options for tuning this and enable it
by default for people.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c
index d37a397f43f5..ac71dc15cbdb 100644
--- a/arch/blackfin/kernel/setup.c
+++ b/arch/blackfin/kernel/setup.c
@@ -864,6 +864,13 @@ void __init setup_arch(char **cmdline_p)
         bfin_write_EBIU_MODE(CONFIG_EBIU_MODEVAL);
         bfin_write_EBIU_FCTL(CONFIG_EBIU_FCTLVAL);
 #endif
+#ifdef CONFIG_BFIN_HYSTERESIS_CONTROL
+        bfin_write_PORTF_HYSTERISIS(HYST_PORTF_0_15);
+        bfin_write_PORTG_HYSTERISIS(HYST_PORTG_0_15);
+        bfin_write_PORTH_HYSTERISIS(HYST_PORTH_0_15);
+        bfin_write_MISCPORT_HYSTERISIS((bfin_read_MISCPORT_HYSTERISIS() &
+                                        ~HYST_NONEGPIO_MASK) | HYST_NONEGPIO);
+#endif
 
         cclk = get_cclk();
         sclk = get_sclk();