pinctrl: imx: move hard-coding data into device tree

Currently, all imx pinctrl drivers maintain a big array of struct
imx_pin_reg which hard-codes data like register offset and mux mode
setting for each pin function.  Every time a new imx SoC support is
added, we need to add such a big mount of data.  With moving to single
kernel build, it's only matter of time to be blamed on memory consuming.

With DTC pre-processor support in place, the patch moves all these data
into device tree by redefining the PIN_FUNC_ID in imxXX-pinfunc.h and
changing the PIN_FUNC_ID parsing code a little bit.

The pin id gets re-numbered based on mux register offset, or config
register offset if the pin has no mux register, so that kernel can
identify the pin id from register offsets provided by device tree.

As a bonus point of the change, those arbitrary magic numbers standing
for particular PIN_FUNC_ID in device tree sources are now replaced by
macros to improve the readability of dts files.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Dong Aisheng <dong.aisheng@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/arm/boot/dts/imx6q-sabreauto.dts b/arch/arm/boot/dts/imx6q-sabreauto.dts
index 42c0a87b4134..5e273eca3f19 100644
--- a/arch/arm/boot/dts/imx6q-sabreauto.dts
+++ b/arch/arm/boot/dts/imx6q-sabreauto.dts
@@ -29,8 +29,8 @@
 	hog {
 		pinctrl_hog: hoggrp {
 			fsl,pins = <
-				1376 0x80000000	/* MX6Q_PAD_NANDF_CS2__GPIO_6_15 */
-				13   0x80000000	/* MX6Q_PAD_SD2_DAT2__GPIO_1_13 */
+				MX6Q_PAD_NANDF_CS2__GPIO6_IO15 0x80000000
+				MX6Q_PAD_SD2_DAT2__GPIO1_IO13  0x80000000
 			>;
 		};
 	};