pinctrl: sirf: enable GPIO pullup/down configuration from dts

commit 7bec207427c2efb794 remove sirfsoc_gpio_set_pull function,
this patches takes the feature back by adding sirf,pullups and
sirf,pulldowns prop in dts, and the driver will set the GPIO
pull according to the dts.

Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

2 files changed, 51 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-sirf.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-sirf.txt
index a2896df702a..c596a6ad328 100644
--- a/Documentation/devicetree/bindings/pinctrl/pinctrl-sirf.txt
+++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-sirf.txt
@@ -6,6 +6,9 @@ Required properties:
 - interrupts    : Interrupts used by every GPIO group
 - gpio-controller : Indicates this device is a GPIO controller
 - interrupt-controller  : Marks the device node as an interrupt controller
+Optional properties:
+- sirf,pullups : if n-th bit of m-th bank is set, set a pullup on GPIO-n of bank m
+- sirf,pulldowns : if n-th bit of m-th bank is set, set a pulldown on GPIO-n of bank m
 
 Please refer to pinctrl-bindings.txt in this directory for details of the common
 pinctrl bindings used by client devices.
diff --git a/drivers/pinctrl/pinctrl-sirf.c b/drivers/pinctrl/pinctrl-sirf.c
index a4f0c5e487d..30e1a38293a 100644
--- a/drivers/pinctrl/pinctrl-sirf.c
+++ b/drivers/pinctrl/pinctrl-sirf.c
@@ -1663,6 +1663,44 @@ const struct irq_domain_ops sirfsoc_gpio_irq_simple_ops = {
         .xlate = irq_domain_xlate_twocell,
 };
 
+static void sirfsoc_gpio_set_pullup(const u32 *pullups)
+{
+        int i, n;
+        const unsigned long *p = (const unsigned long *)pullups;
+
+        for (i = 0; i < SIRFSOC_GPIO_NO_OF_BANKS; i++) {
+                n = find_first_bit(p + i, BITS_PER_LONG);
+                while (n < BITS_PER_LONG) {
+                        u32 offset = SIRFSOC_GPIO_CTRL(i, n);
+                        u32 val = readl(sgpio_bank[i].chip.regs + offset);
+                        val |= SIRFSOC_GPIO_CTL_PULL_MASK;
+                        val |= SIRFSOC_GPIO_CTL_PULL_HIGH;
+                        writel(val, sgpio_bank[i].chip.regs + offset);
+
+                        n = find_next_bit(p + i, BITS_PER_LONG, n + 1);
+                }
+        }
+}
+
+static void sirfsoc_gpio_set_pulldown(const u32 *pulldowns)
+{
+        int i, n;
+        const unsigned long *p = (const unsigned long *)pulldowns;
+
+        for (i = 0; i < SIRFSOC_GPIO_NO_OF_BANKS; i++) {
+                n = find_first_bit(p + i, BITS_PER_LONG);
+                while (n < BITS_PER_LONG) {
+                        u32 offset = SIRFSOC_GPIO_CTRL(i, n);
+                        u32 val = readl(sgpio_bank[i].chip.regs + offset);
+                        val |= SIRFSOC_GPIO_CTL_PULL_MASK;
+                        val &= ~SIRFSOC_GPIO_CTL_PULL_HIGH;
+                        writel(val, sgpio_bank[i].chip.regs + offset);
+
+                        n = find_next_bit(p + i, BITS_PER_LONG, n + 1);
+                }
+        }
+}
+
 static int __devinit sirfsoc_gpio_probe(struct device_node *np)
 {
         int i, err = 0;
@@ -1671,6 +1709,8 @@ static int __devinit sirfsoc_gpio_probe(struct device_node *np)
         struct platform_device *pdev;
         bool is_marco = false;
 
+        u32 pullups[SIRFSOC_GPIO_NO_OF_BANKS], pulldowns[SIRFSOC_GPIO_NO_OF_BANKS];
+
         pdev = of_find_device_by_node(np);
         if (!pdev)
                 return -ENODEV;
@@ -1726,6 +1766,14 @@ static int __devinit sirfsoc_gpio_probe(struct device_node *np)
                 irq_set_handler_data(bank->parent_irq, bank);
         }
 
+        if (!of_property_read_u32_array(np, "sirf,pullups", pullups,
+                SIRFSOC_GPIO_NO_OF_BANKS))
+                sirfsoc_gpio_set_pullup(pullups);
+
+        if (!of_property_read_u32_array(np, "sirf,pulldowns", pulldowns,
+                SIRFSOC_GPIO_NO_OF_BANKS))
+                sirfsoc_gpio_set_pulldown(pulldowns);
+
         return 0;
 
 out: