From 0fa86fc2e28227f1e64f13867e73cf864c6d25ad Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Wed, 11 Nov 2020 14:06:05 +0200 Subject: pinctrl: merrifield: Set default bias in case no particular value given When GPIO library asks pin control to set the bias, it doesn't pass any value of it and argument is considered boolean (and this is true for ACPI GpioIo() / GpioInt() resources, by the way). Thus, individual drivers must behave well, when they got the resistance value of 1 Ohm, i.e. transforming it to sane default. In case of Intel Merrifield pin control hardware the 20 kOhm sounds plausible because it gives a good trade off between weakness and minimization of leakage current (will be only 50 uA with the above choice). Fixes: 4e80c8f50574 ("pinctrl: intel: Add Intel Merrifield pin controller support") Depends-on: 2956b5d94a76 ("pinctrl / gpio: Introduce .set_config() callback for GPIO chips") Signed-off-by: Andy Shevchenko Acked-by: Mika Westerberg --- drivers/pinctrl/intel/pinctrl-merrifield.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'drivers/pinctrl/intel') diff --git a/drivers/pinctrl/intel/pinctrl-merrifield.c b/drivers/pinctrl/intel/pinctrl-merrifield.c index e4ff8da1b894..3ae141e0b421 100644 --- a/drivers/pinctrl/intel/pinctrl-merrifield.c +++ b/drivers/pinctrl/intel/pinctrl-merrifield.c @@ -745,6 +745,10 @@ static int mrfld_config_set_pin(struct mrfld_pinctrl *mp, unsigned int pin, mask |= BUFCFG_Px_EN_MASK | BUFCFG_PUPD_VAL_MASK; bits |= BUFCFG_PU_EN; + /* Set default strength value in case none is given */ + if (arg == 1) + arg = 20000; + switch (arg) { case 50000: bits |= BUFCFG_PUPD_VAL_50K << BUFCFG_PUPD_VAL_SHIFT; @@ -765,6 +769,10 @@ static int mrfld_config_set_pin(struct mrfld_pinctrl *mp, unsigned int pin, mask |= BUFCFG_Px_EN_MASK | BUFCFG_PUPD_VAL_MASK; bits |= BUFCFG_PD_EN; + /* Set default strength value in case none is given */ + if (arg == 1) + arg = 20000; + switch (arg) { case 50000: bits |= BUFCFG_PUPD_VAL_50K << BUFCFG_PUPD_VAL_SHIFT; -- cgit v1.2.3-59-g8ed1b