svn commit: r286165 - head/sys/arm/ti
Oleksandr Tymoshenko
gonzo at FreeBSD.org
Sat Aug 1 23:10:38 UTC 2015
Author: gonzo
Date: Sat Aug 1 23:10:36 2015
New Revision: 286165
URL: https://svnweb.freebsd.org/changeset/base/286165
Log:
Set output pin initial value based on pin's pinmux pullup/pulldown setup
Some of FDT blobs for AM335x-based devices use pinmux pullup/pulldown
flag to setup initial GPIO ouputp value, e.g. 4DCAPE-43 sets LCD DATAEN
signal this way. It works for Linux because Linux driver does not enforce
pin direction until after it's requested by consumer. So input with pullup
flag set acts as output with GPIO_HIGH value
Reviewed by: loos
Modified:
head/sys/arm/ti/ti_gpio.c
Modified: head/sys/arm/ti/ti_gpio.c
==============================================================================
--- head/sys/arm/ti/ti_gpio.c Sat Aug 1 22:56:42 2015 (r286164)
+++ head/sys/arm/ti/ti_gpio.c Sat Aug 1 23:10:36 2015 (r286165)
@@ -573,7 +573,7 @@ ti_gpio_bank_init(device_t dev)
{
int pin;
struct ti_gpio_softc *sc;
- uint32_t flags, reg_oe, rev;
+ uint32_t flags, reg_oe, reg_set, rev;
clk_ident_t clk;
sc = device_get_softc(dev);
@@ -607,12 +607,18 @@ ti_gpio_bank_init(device_t dev)
/* Init OE register based on pads configuration. */
reg_oe = 0xffffffff;
+ reg_set = 0;
for (pin = 0; pin < PINS_PER_BANK; pin++) {
TI_GPIO_GET_FLAGS(dev, pin, &flags);
- if (flags & GPIO_PIN_OUTPUT)
+ if (flags & GPIO_PIN_OUTPUT) {
reg_oe &= ~(1UL << pin);
+ if (flags & GPIO_PIN_PULLUP)
+ reg_set |= (1UL << pin);
+ }
}
ti_gpio_write_4(sc, TI_GPIO_OE, reg_oe);
+ if (reg_set)
+ ti_gpio_write_4(sc, TI_GPIO_SETDATAOUT, reg_set);
return (0);
}
More information about the svn-src-all
mailing list