libsoc: patch library to allow udev events to complete

After exporting a GPIO or PWM, we need to give some time for udev rules
to complete, before actually trying to access the newly created entries
in the sysfs.

This solves a problem, where udev was setting the mode and group of
the newly created files, so they are accessible for users (not root)
belonging to that group.

For traceability and to be sure the patch applies without conflicts,
this commit also sets a fixed revision to use from the libsoc
repository.

https://jira.digi.com/browse/DEL-5389

Signed-off-by: Javier Viguera <javier.viguera@digi.com>

meta-digi-dey/recipes-support/libsoc/libsoc/0001-gpio-pwm-add-delay-to-allow-udev-rules-to-complete.patch

@@ -0,0 +1,46 @@
+From: Javier Viguera <javier.viguera@digi.com>
+Date: Tue, 28 Nov 2017 17:39:05 +0100
+Subject: [PATCH] gpio,pwm: add delay to allow udev rules to complete
+
+After exporting a GPIO or PWM, we need to give some time for udev rules
+to complete, before actually trying to access the newly created entries
+in the sysfs.
+
+This solves a problem, where udev was setting the mode and group of
+the newly created files, so they are accessible for users (not root)
+belonging to that group.
+
+Signed-off-by: Javier Viguera <javier.viguera@digi.com>
+---
+ lib/gpio.c | 3 +++
+ lib/pwm.c  | 3 +++
+ 2 files changed, 6 insertions(+)
+
+diff --git a/lib/gpio.c b/lib/gpio.c
+index bc509f8f09d7..527f2be649a4 100644
+--- a/lib/gpio.c
++++ b/lib/gpio.c
+@@ -104,6 +104,9 @@ libsoc_gpio_request (unsigned int gpio_id, gpio_mode mode)
+       if (file_close (fd))
+ 	return NULL;
+ 
++      /* Give udev some time to execute the rules of the exported GPIO */
++      usleep(200000);
++
+       sprintf (tmp_str, "/sys/class/gpio/gpio%d", gpio_id);
+ 
+       if (!file_valid (tmp_str))
+diff --git a/lib/pwm.c b/lib/pwm.c
+index 94a20d9be281..ed6dec8ee2a9 100644
+--- a/lib/pwm.c
++++ b/lib/pwm.c
+@@ -88,6 +88,9 @@ pwm* libsoc_pwm_request (unsigned int chip, unsigned int pwm_num,
+       return NULL;
+     }
+ 
++    /* Give udev some time to execute the rules of the exported PWM */
++    usleep(200000);
++
+     sprintf(tmp_str, "/sys/class/pwm/pwmchip%d/pwm%d/enable", chip, pwm_num);
+ 
+     if (!file_valid(tmp_str))

meta-digi-dey/recipes-support/libsoc/libsoc_git.bbappend

@@ -1,12 +1,15 @@
 # Copyright (C) 2017 Digi International Inc.
 
+FILESEXTRAPATHS_prepend := "${THISDIR}/${BPN}:"
+
 LIBSOC_URI_STASH = "${DIGI_MTK_GIT}dey/libsoc.git;protocol=ssh"
 LIBSOC_URI_GITHUB = "git://github.com/jackmitch/libsoc.git;protocol=git"
 LIBSOC_URI ?= "${@base_conditional('DIGI_INTERNAL_GIT', '1' , '${LIBSOC_URI_STASH}', '${LIBSOC_URI_GITHUB}', d)}"
 
+SRCREV = "dc62bb1f04c13d0423078b1af2bb439c62023d6c"
 SRC_URI = " \
-    ${LIBSOC_URI};branch=${SRCBRANCH} \
+    ${LIBSOC_URI};nobranch=1 \
+    file://0001-gpio-pwm-add-delay-to-allow-udev-rules-to-complete.patch \
 "
 
 PACKAGECONFIG = "python"
-