gpio/nomadik: support low EMI mode

[sagit-ice-cold/kernel_xiaomi_msm8998.git] / drivers / gpio / gpio-nomadik.c

diff --git a/drivers/gpio/gpio-nomadik.c b/drivers/gpio/gpio-nomadik.c
index 681daee..7b45d88 100644 (file)
--- a/drivers/gpio/gpio-nomadik.c
+++ b/drivers/gpio/gpio-nomadik.c
@@ -61,6 +61,7 @@ struct nmk_gpio_chip {
        u32 rimsc;
        u32 fimsc;
        u32 pull_up;
+       u32 lowemi;
 };
 
 static struct nmk_gpio_chip *
@@ -125,6 +126,24 @@ static void __nmk_gpio_set_pull(struct nmk_gpio_chip *nmk_chip,
        }
 }
 
+static void __nmk_gpio_set_lowemi(struct nmk_gpio_chip *nmk_chip,
+                                 unsigned offset, bool lowemi)
+{
+       u32 bit = BIT(offset);
+       bool enabled = nmk_chip->lowemi & bit;
+
+       if (lowemi == enabled)
+               return;
+
+       if (lowemi)
+               nmk_chip->lowemi |= bit;
+       else
+               nmk_chip->lowemi &= ~bit;
+
+       writel_relaxed(nmk_chip->lowemi,
+                      nmk_chip->addr + NMK_GPIO_LOWEMI);
+}
+
 static void __nmk_gpio_make_input(struct nmk_gpio_chip *nmk_chip,
                                  unsigned offset)
 {
@@ -269,6 +288,8 @@ static void __nmk_config_pin(struct nmk_gpio_chip *nmk_chip, unsigned offset,
                __nmk_gpio_set_pull(nmk_chip, offset, pull);
        }
 
+       __nmk_gpio_set_lowemi(nmk_chip, offset, PIN_LOWEMI(cfg));
+
        /*
         * If the pin is switching to altfunc, and there was an interrupt
         * installed on it which has been lazy disabled, actually mask the
@@ -1181,6 +1202,10 @@ static int __devinit nmk_gpio_probe(struct platform_device *dev)
        chip->dev = &dev->dev;
        chip->owner = THIS_MODULE;
 
+       clk_enable(nmk_chip->clk);
+       nmk_chip->lowemi = readl_relaxed(nmk_chip->addr + NMK_GPIO_LOWEMI);
+       clk_disable(nmk_chip->clk);
+
        ret = gpiochip_add(&nmk_chip->chip);
        if (ret)
                goto out_free;