mfd: twl4030-power: Add support for board specific configuration

With the recommended twl4030 configuration added, we can now add
board specific changes as modifications to the recommended
configuration.

Note that the data is private to this driver, and the data must
always have a NULL resource in the sentinel.

Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

2 files changed, 22 insertions, 0 deletions

diff --git a/drivers/mfd/twl4030-power.c b/drivers/mfd/twl4030-power.c
index 2bfbb40ca9d2..4846c7b48ebb 100644
--- a/drivers/mfd/twl4030-power.c
+++ b/drivers/mfd/twl4030-power.c
@@ -567,13 +567,34 @@ twl4030_power_configure_scripts(const struct twl4030_power_data *pdata)
         return 0;
 }
 
+static void twl4030_patch_rconfig(struct twl4030_resconfig *common,
+                                  struct twl4030_resconfig *board)
+{
+        while (common->resource) {
+                struct twl4030_resconfig *b = board;
+
+                while (b->resource) {
+                        if (b->resource == common->resource) {
+                                *common = *b;
+                                break;
+                        }
+                        b++;
+                }
+                common++;
+        }
+}
+
 static int
 twl4030_power_configure_resources(const struct twl4030_power_data *pdata)
 {
         struct twl4030_resconfig *resconfig = pdata->resource_config;
+        struct twl4030_resconfig *boardconf = pdata->board_config;
         int err;
 
         if (resconfig) {
+                if (boardconf)
+                        twl4030_patch_rconfig(resconfig, boardconf);
+
                 while (resconfig->resource) {
                         err = twl4030_configure_resource(resconfig);
                         if (err)
diff --git a/include/linux/i2c/twl.h b/include/linux/i2c/twl.h
index 5fe031375ed4..57fe782bf031 100644
--- a/include/linux/i2c/twl.h
+++ b/include/linux/i2c/twl.h
@@ -662,6 +662,7 @@ struct twl4030_power_data {
         struct twl4030_script **scripts;
         unsigned num;
         struct twl4030_resconfig *resource_config;
+        struct twl4030_resconfig *board_config;
 #define TWL4030_RESCONFIG_UNDEF ((u8)-1)
         bool use_poweroff;      /* Board is wired for TWL poweroff */
 };