Add 16-bit single register pin controller support

Enables the pinctrl-single driver to support 16-bit registers. Only
32-bit registers were supported previously. Reduced width registers are
required for some platforms, such as OMAP.

Signed-off-by: James Balean <james@balean.com.au>
Cc: Felix Brack <fb@ltec.ch>
Cc: Simon Glass <sjg@chromium.org>
Reviewed-by: Felix Brack <fb@ltec.ch>
Tested-by: Felix Brack <fb@ltec.ch>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
index d2dcec0..f19f779 100644 (file)
--- a/drivers/pinctrl/pinctrl-single.c
+++ b/drivers/pinctrl/pinctrl-single.c
@@ -47,27 +47,27 @@ static int single_configure_pins(struct udevice *dev,
        int n, reg;
        u32 val;
 
-       for (n = 0; n < count; n++) {
+       for (n = 0; n < count; n++, pins++) {
                reg = fdt32_to_cpu(pins->reg);
                if ((reg < 0) || (reg > pdata->offset)) {
                        dev_dbg(dev, "  invalid register offset 0x%08x\n", reg);
-                       pins++;
                        continue;
                }
                reg += pdata->base;
+               val = fdt32_to_cpu(pins->val) & pdata->mask;
                switch (pdata->width) {
+               case 16:
+                       writew((readw(reg) & ~pdata->mask) | val, reg);
+                       break;
                case 32:
-                       val = readl(reg) & ~pdata->mask;
-                       val |= fdt32_to_cpu(pins->val) & pdata->mask;
-                       writel(val, reg);
-                       dev_dbg(dev, "  reg/val 0x%08x/0x%08x\n",
-                               reg, val);
+                       writel((readl(reg) & ~pdata->mask) | val, reg);
                        break;
                default:
                        dev_warn(dev, "unsupported register width %i\n",
                                 pdata->width);
+                       continue;
                }
-               pins++;
+               dev_dbg(dev, "  reg/val 0x%08x/0x%08x\n",reg, val);
        }
        return 0;
 }