kernel: backport rtc ds1308 support to 4.9

Signed-off-by: Martin Schiller <ms@dev.tdt.de>

diff --git a/target/linux/generic/backport-4.9/095-v4.13-0001-rtc-ds1307-add-ds1308-variant.patch b/target/linux/generic/backport-4.9/095-v4.13-0001-rtc-ds1307-add-ds1308-variant.patch
new file mode 100644 (file)
index 0000000..9634661
--- /dev/null
+++ b/target/linux/generic/backport-4.9/095-v4.13-0001-rtc-ds1307-add-ds1308-variant.patch
@@ -0,0 +1,51 @@
+From 300a7735becf55f7fd18f8cd3dc3b945a0cab712 Mon Sep 17 00:00:00 2001
+From: Sean Nyekjaer <sean.nyekjaer@prevas.dk>
+Date: Thu, 8 Jun 2017 12:36:54 +0200
+Subject: rtc: ds1307: add ds1308 variant
+
+The ds1308 variant is very similar to the already supported ds1338
+variant, it have more debug registers and a square wave clock output.
+
+Signed-off-by: Sean Nyekjaer <sean.nyekjaer@prevas.dk>
+Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
+---
+ drivers/rtc/rtc-ds1307.c | 12 ++++++++++++
+ 1 file changed, 12 insertions(+)
+
+--- a/drivers/rtc/rtc-ds1307.c
++++ b/drivers/rtc/rtc-ds1307.c
+@@ -31,6 +31,7 @@
+  */
+ enum ds_type {
+       ds_1307,
++      ds_1308,
+       ds_1337,
+       ds_1338,
+       ds_1339,
+@@ -144,6 +145,10 @@ static struct chip_desc chips[last_ds_ty
+               .nvram_offset   = 8,
+               .nvram_size     = 56,
+       },
++      [ds_1308] = {
++              .nvram_offset   = 8,
++              .nvram_size     = 56,
++      },
+       [ds_1337] = {
+               .alarm          = 1,
+       },
+@@ -175,6 +180,7 @@ static struct chip_desc chips[last_ds_ty
+ 
+ static const struct i2c_device_id ds1307_id[] = {
+       { "ds1307", ds_1307 },
++      { "ds1308", ds_1308 },
+       { "ds1337", ds_1337 },
+       { "ds1338", ds_1338 },
+       { "ds1339", ds_1339 },
+@@ -1488,6 +1494,7 @@ read_rtc:
+                       goto read_rtc;
+               }
+               break;
++      case ds_1308:
+       case ds_1338:
+               /* clock halted?  turn it on, so clock can tick. */
+               if (tmp & DS1307_BIT_CH)