linux_chromiumos_3_18: init at 3.18.0

Co-authored-by: Nikolay Amiantov <ab@fmap.me>

pkgs/os-specific/linux/kernel/common-config.nix

@@ -147,7 +147,7 @@ with stdenv.lib;
 
   # Video configuration.
   # Enable KMS for devices whose X.org driver supports it.
-  ${optionalString (versionOlder version "4.3") ''
+  ${optionalString (versionOlder version "4.3" && !(features.chromiumos or false)) ''
     DRM_I915_KMS y
   ''}
   # Allow specifying custom EDID on the kernel command line
@@ -503,6 +503,67 @@ with stdenv.lib;
   # Disable the firmware helper fallback, udev doesn't implement it any more
   FW_LOADER_USER_HELPER_FALLBACK? n
 
+  # ChromiumOS support
+  ${optionalString (features.chromiumos or false) ''
+    CHROME_PLATFORMS y
+    VGA_SWITCHEROO n
+    MMC_SDHCI_PXAV2 n
+    NET_IPVTI n
+    IPV6_VTI n
+    REGULATOR_FIXED_VOLTAGE n
+    TPS6105X n
+    CPU_FREQ_STAT y
+    IPV6 y
+    MFD_CROS_EC y
+    MFD_CROS_EC_LPC y
+    MFD_CROS_EC_DEV y
+    CHARGER_CROS_USB_PD y
+    I2C y
+    MEDIA_SUBDRV_AUTOSELECT n
+    VIDEO_IR_I2C n
+    BLK_DEV_DM y
+    ANDROID_PARANOID_NETWORK n
+    DM_VERITY n
+    DRM_VGEM n
+    CPU_FREQ_GOV_INTERACTIVE n
+    INPUT_KEYRESET n
+    DM_BOOTCACHE n
+    UID_CPUTIME n
+
+    ${optionalString (versionAtLeast version "3.18") ''
+      CPUFREQ_DT n
+      EXTCON_CROS_EC n
+      DRM_POWERVR_ROGUE n
+      CHROMEOS_OF_FIRMWARE y
+      TEST_RHASHTABLE n
+      BCMDHD n
+      TRUSTY n
+    ''}
+
+    ${optionalString (versionOlder version "3.18") ''
+      MALI_MIDGARD n
+      DVB_USB_DIB0700 n
+      DVB_USB_DW2102 n
+      DVB_USB_PCTV452E n
+      DVB_USB_TTUSB2 n
+      DVB_USB_AF9015 n
+      DVB_USB_AF9035 n
+      DVB_USB_ANYSEE n
+      DVB_USB_AZ6007 n
+      DVB_USB_IT913X n
+      DVB_USB_LME2510 n
+      DVB_USB_RTL28XXU n
+      USB_S2255 n
+      VIDEO_EM28XX n
+      VIDEO_TM6000 n
+      USB_DWC2 n
+      USB_GSPCA n
+      SPEAKUP n
+      XO15_EBOOK n
+      USB_GADGET n
+    ''}
+  ''}
+
   ${kernelPlatform.kernelExtraConfig or ""}
   ${extraConfig}
 ''