[PATCH] mfd: stmpe: Support disabling sub-functions

[Oleksandr Suvorov]

Add support of sub-functions disabling. It allows one to define
an stmpe sub-function device in devicetree, but keep it disabled.

Signed-off-by: Oleksandr Suvorov <oleksandr.suvo...@toradex.com>
---

 drivers/mfd/stmpe.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c
index 90f3292230c9..2182607b75f6 100644
--- a/drivers/mfd/stmpe.c
+++ b/drivers/mfd/stmpe.c
@@ -1358,6 +1358,9 @@ static void stmpe_of_probe(struct stmpe_platform_data 
*pdata,
        pdata->autosleep = (pdata->autosleep_timeout) ? true : false;
 
        for_each_child_of_node(np, child) {
+               /* skip disabled sub-function */
+               if (!of_device_is_available(child))
+                       continue;
                if (of_node_name_eq(child, "stmpe_gpio")) {
                        pdata->blocks |= STMPE_BLOCK_GPIO;
                } else if (of_node_name_eq(child, "stmpe_keypad")) {
-- 
2.29.2