dm: gpio: Add a comment about not copying some drivers
These three drivers all use U_BOOT_DEVICE rather than device tree to
create devices, so have to do manual allocation of platform data. This is
not true for new platforms.
Add a more explicit comment so that people do not copy this approach with
new boards.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reported-by: Adam Ford <aford173@gmail.com>
diff --git a/drivers/gpio/imx_rgpio2p.c b/drivers/gpio/imx_rgpio2p.c
index 5abc88b..e60e9d2 100644
--- a/drivers/gpio/imx_rgpio2p.c
+++ b/drivers/gpio/imx_rgpio2p.c
@@ -175,6 +175,11 @@
* When every board is converted to driver model and DT is supported,
* this can be done by auto-alloc feature, but not using calloc
* to alloc memory for platdata.
+ *
+ * For example imx_rgpio2p_plat uses platform data rather than device
+ * tree.
+ *
+ * NOTE: DO NOT COPY this code if you are using device tree.
*/
plat = calloc(1, sizeof(*plat));
if (!plat)