Don't try to open readonly sysfs nodes in tweakd

pmos_tweaks/settingstree.py

@@ -88,6 +88,7 @@ class Setting:
             self.key = definition['key']
             self.stype = definition['stype']
             self.multiplier = definition['multiplier'] if 'multiplier' in definition else 1
+            self.readonly = definition['readonly'] if 'readonly' in definition else False
         elif self.backend == 'osksdl':
             self.needs_root = True
             self.key = definition['key']

pmos_tweaks/tweakd.py

@@ -21,7 +21,7 @@ def main(version, datadir=None):
         for section in settings[page]['sections']:
             for setting in settings[page]['sections'][section]['settings']:
                 s = settings[page]['sections'][section]['settings'][setting]
-                if s.backend == 'sysfs':
+                if s.backend == 'sysfs' and not s.readonly:
                     whitelist_sysfs.append(s.key)
 
     # Read the stored settings and apply them

settings/pinephone.yml

@@ -26,4 +26,5 @@
           type: info
           stype: int
           backend: sysfs
-          key: /sys/firmware/devicetree/base/memory/ram_freq
\ No newline at end of file
+          key: /sys/firmware/devicetree/base/memory/ram_freq
+          readonly: true
\ No newline at end of file