mfd: Add regmap cache support for wm8350

Use the most simple possible transformation on the existing code so keep
the table sitting around, further patches in this series will delete the
existing cache code - the main purpose of this patch is to ensure that
we always have a cache for bisection.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 56 insertions, 0 deletions

diff --git a/drivers/mfd/wm8350-regmap.c b/drivers/mfd/wm8350-regmap.c
index e965139e5cd5..7974cadaa422 100644
--- a/drivers/mfd/wm8350-regmap.c
+++ b/drivers/mfd/wm8350-regmap.c
@@ -3433,3 +3433,59 @@ const struct wm8350_reg_access wm8350_reg_io_map[] = {
         { 0x0000, 0x0000, 0x0000 }, /* R254 */
         { 0x0000, 0x0000, 0x0000 }, /* R255 */
 };
+
+static bool wm8350_readable(struct device *dev, unsigned int reg)
+{
+        return wm8350_reg_io_map[reg].readable;
+}
+
+static bool wm8350_writeable(struct device *dev, unsigned int reg)
+{
+        struct wm8350 *wm8350 = dev_get_drvdata(dev);
+
+        if (!wm8350->unlocked) {
+                if ((reg >= WM8350_GPIO_FUNCTION_SELECT_1 &&
+                     reg <= WM8350_GPIO_FUNCTION_SELECT_4) ||
+                    (reg >= WM8350_BATTERY_CHARGER_CONTROL_1 &&
+                     reg <= WM8350_BATTERY_CHARGER_CONTROL_3))
+                        return false;
+        }
+
+        return wm8350_reg_io_map[reg].writable;
+}
+
+static bool wm8350_volatile(struct device *dev, unsigned int reg)
+{
+        return wm8350_reg_io_map[reg].vol;
+}
+
+static bool wm8350_precious(struct device *dev, unsigned int reg)
+{
+        switch (reg) {
+        case WM8350_SYSTEM_INTERRUPTS:
+        case WM8350_INT_STATUS_1:
+        case WM8350_INT_STATUS_2:
+        case WM8350_POWER_UP_INT_STATUS:
+        case WM8350_UNDER_VOLTAGE_INT_STATUS:
+        case WM8350_OVER_CURRENT_INT_STATUS:
+        case WM8350_GPIO_INT_STATUS:
+        case WM8350_COMPARATOR_INT_STATUS:
+                return true;
+
+        default:
+                return false;
+        }
+}
+
+const struct regmap_config wm8350_regmap = {
+        .reg_bits = 8,
+        .val_bits = 16,
+
+        .cache_type = REGCACHE_RBTREE,
+
+        .max_register = WM8350_MAX_REGISTER,
+        .readable_reg = wm8350_readable,
+        .writeable_reg = wm8350_writeable,
+        .volatile_reg = wm8350_volatile,
+        .precious_reg = wm8350_precious,
+};