[PATCH 2/2][v3] gpio-mpc8xxx: add mpc8xxx_gpio_set_multiple function

[Rojhalat Ibrahim <imr@rtschenk.de>]

Add a set_multiple function to the MPC8xxx GPIO chip driver and thereby allow
for actual performance improvements when setting multiple outputs
simultaneously. In my case the time needed to configure an FPGA goes down from
48 s to 19 s.

Signed-off-by: Rojhalat Ibrahim <imr@rtschenk.de>
---
This patch depends on my previous patch "gpiolib: allow simultaneous setting
of multiple GPIO outputs".

Change log:
  v3: - change commit message
  v2: - add this patch (v1 included only changes to gpiolib)

 drivers/gpio/gpio-mpc8xxx.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c
index d7d6d72..d226f5c 100644
--- a/drivers/gpio/gpio-mpc8xxx.c
+++ b/drivers/gpio/gpio-mpc8xxx.c
@@ -105,6 +105,33 @@ static void mpc8xxx_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 	spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
 }
 
+static void mpc8xxx_gpio_set_multiple(struct gpio_chip *gc,
+				      u32 *mask, u32 *bits)
+{
+	struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
+	struct mpc8xxx_gpio_chip *mpc8xxx_gc = to_mpc8xxx_gpio_chip(mm);
+	unsigned long flags;
+	int i;
+
+	spin_lock_irqsave(&mpc8xxx_gc->lock, flags);
+
+	for (i = 0; i < gc->ngpio; i++) {
+		if (*mask == 0)
+			break;
+		if (*mask & (1 << i)) {
+			if ((*bits >> i) & 1)
+				mpc8xxx_gc->data |= mpc8xxx_gpio2mask(i);
+			else
+				mpc8xxx_gc->data &= ~mpc8xxx_gpio2mask(i);
+			*mask &= ~(1 << i);
+		}
+	}
+
+	out_be32(mm->regs + GPIO_DAT, mpc8xxx_gc->data);
+
+	spin_unlock_irqrestore(&mpc8xxx_gc->lock, flags);
+}
+
 static int mpc8xxx_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
 {
 	struct of_mm_gpio_chip *mm = to_of_mm_gpio_chip(gc);
@@ -344,6 +371,7 @@ static void __init mpc8xxx_add_controller(struct device_node *np)
 	gc->get = of_device_is_compatible(np, "fsl,mpc8572-gpio") ?
 		mpc8572_gpio_get : mpc8xxx_gpio_get;
 	gc->set = mpc8xxx_gpio_set;
+	gc->set_multiple = mpc8xxx_gpio_set_multiple;
 	gc->to_irq = mpc8xxx_gpio_to_irq;
 
 	ret = of_mm_gpiochip_add(np, mm_gc);

--
1.8.5.5