Pins must be set from a driver. Tie the radio pins to the MTS-IO driver.

1 files changed, 25 insertions, 4 deletions

diff --git a/recipes-kernel/linux/linux-at91-4.9.87/mtcap/linux-4.9-mtcap-device-tree.patch b/recipes-kernel/linux/linux-at91-4.9.87/mtcap/linux-4.9-mtcap-device-tree.patch
index 7bb7268..0173ed0 100644
--- a/recipes-kernel/linux/linux-at91-4.9.87/mtcap/linux-4.9-mtcap-device-tree.patch
+++ b/recipes-kernel/linux/linux-at91-4.9.87/mtcap/linux-4.9-mtcap-device-tree.patch
@@ -245,10 +245,20 @@ diff -Naru linux-4.9.87.orig/arch/arm/boot/dts/Makefile linux-4.9.87/arch/arm/bo
  dtb-$(CONFIG_SOC_SAM_V7) += \
  	at91-kizbox2.dtb \
  	at91-sama5d2_ptc_ek.dtb \
+===================================================================================================
+ The dts file contains pinctrl to set the pull-up and pull-down features using the at91 pinctrl
+ driver.  Because pins seemed to be assigned random values if not set, it is probably good
+ to set any pin used by mts-io here, and it wouldn't be a bad idea to set unused pins as well,
+ since they can be both pull-up and pull-down at the same time. 
+ For future hardware revisions, it should be possible to overwrite the pinctrl with an overlay
+ prior to loading the mts-io driver.
+
+ To use the pinctrl, one must call platform_device_register() in the driver.
+==================================================================================================
 diff -Naru linux-4.9.87.orig/arch/arm/boot/dts/mtcap.dts linux-4.9.87/arch/arm/boot/dts/mtcap.dts
 --- linux-4.9.87.orig/arch/arm/boot/dts/mtcap.dts	1969-12-31 18:00:00.000000000 -0600
-+++ linux-4.9.87/arch/arm/boot/dts/mtcap.dts	2019-01-30 18:15:28.034199195 -0600
-@@ -0,0 +1,253 @@
++++ linux-4.9.87/arch/arm/boot/dts/mtcap.dts	2019-01-31 18:11:18.651648726 -0600
+@@ -0,0 +1,264 @@
 +/*
 + * DTS file for Multi-Tech Systems MTCAP Hardware
 + *
@@ -345,9 +355,13 @@ diff -Naru linux-4.9.87.orig/arch/arm/boot/dts/mtcap.dts linux-4.9.87/arch/arm/b
 +				/*
 +				 * Pin D21 will be left floating when the power goes off on the radio.
 +				 * We need to pull it down to ensure it is low during radio power-off.
++                                 * pinctrl is loaded during the call to platform_device_register() in mts-io.
++                                 * If we need to customize this for various hardware revisions, these can
++                                 * be loaded as overlays prior to loading the mts-io module, overwriting the
++                                 * atmel,pins section.
 +				 */
-+				radio_control {
-+					pinctrl_radio_control: radio_control-0 {
++				mts_io {
++					pinctrl_mts_io: mts_io-0 {
 +						atmel,pins =
 +							<AT91_PIOA 21 AT91_PERIPH_GPIO AT91_PINCTRL_PULL_UP  /* PA21 GPIO pull-up radio-power */
 +							AT91_PIOA 22 AT91_PERIPH_GPIO AT91_PINCTRL_PULL_UP   /* PA22 GPIO pull-up radio-reset */
@@ -501,4 +515,11 @@ diff -Naru linux-4.9.87.orig/arch/arm/boot/dts/mtcap.dts linux-4.9.87/arch/arm/b
 +                        status = "okay";
 +                };
 +        };
++
++        mts-io-0 {
++            status = "okay";
++            compatible = "mts,mts-io";
++            pinctrl-names = "default";
++            pinctrl-0 = <&pinctrl_mts_io>;
++        };
 +};