diff options
Diffstat (limited to 'drivers/pinctrl/pinctrl-nomadik.c')
| -rw-r--r-- | drivers/pinctrl/pinctrl-nomadik.c | 27 |
1 files changed, 24 insertions, 3 deletions
diff --git a/drivers/pinctrl/pinctrl-nomadik.c b/drivers/pinctrl/pinctrl-nomadik.c index b26395d16347..dd9e6f26416d 100644 --- a/drivers/pinctrl/pinctrl-nomadik.c +++ b/drivers/pinctrl/pinctrl-nomadik.c @@ -673,7 +673,7 @@ static void __nmk_gpio_set_wake(struct nmk_gpio_chip *nmk_chip, * wakeup is anyhow controlled by the RIMSC and FIMSC registers. */ if (nmk_chip->sleepmode && on) { - __nmk_gpio_set_slpm(nmk_chip, gpio % nmk_chip->chip.base, + __nmk_gpio_set_slpm(nmk_chip, gpio % NMK_GPIO_PER_CHIP, NMK_GPIO_SLPM_WAKEUP_ENABLE); } @@ -1198,7 +1198,7 @@ static int __devinit nmk_gpio_probe(struct platform_device *dev) if (!pdata) return -ENOMEM; - if (of_get_property(np, "supports-sleepmode", NULL)) + if (of_get_property(np, "st,supports-sleepmode", NULL)) pdata->supports_sleepmode = true; if (of_property_read_u32(np, "gpio-bank", &dev->id)) { @@ -1246,6 +1246,7 @@ static int __devinit nmk_gpio_probe(struct platform_device *dev) ret = PTR_ERR(clk); goto out_unmap; } + clk_prepare(clk); nmk_chip = kzalloc(sizeof(*nmk_chip), GFP_KERNEL); if (!nmk_chip) { @@ -1437,7 +1438,27 @@ static int nmk_pmx_enable(struct pinctrl_dev *pctldev, unsigned function, dev_dbg(npct->dev, "enable group %s, %u pins\n", g->name, g->npins); - /* Handle this special glitch on altfunction C */ + /* + * If we're setting altfunc C by setting both AFSLA and AFSLB to 1, + * we may pass through an undesired state. In this case we take + * some extra care. + * + * Safe sequence used to switch IOs between GPIO and Alternate-C mode: + * - Save SLPM registers (since we have a shadow register in the + * nmk_chip we're using that as backup) + * - Set SLPM=0 for the IOs you want to switch and others to 1 + * - Configure the GPIO registers for the IOs that are being switched + * - Set IOFORCE=1 + * - Modify the AFLSA/B registers for the IOs that are being switched + * - Set IOFORCE=0 + * - Restore SLPM registers + * - Any spurious wake up event during switch sequence to be ignored + * and cleared + * + * We REALLY need to save ALL slpm registers, because the external + * IOFORCE will switch *all* ports to their sleepmode setting to as + * to avoid glitches. (Not just one port!) + */ glitch = (g->altsetting == NMK_GPIO_ALT_C); if (glitch) { |