ipq806x: Add support for linux-4.4

1)Changes

- Rebased the patches for linux-4.4.7
- Added patch to fix spi nor fifo and dma support
- Added patch to configure watchdog barktime

2)Testing

Tested on IPQ AP148 Board:
 a. NOR boot and NAND boot
 b. ethernet network and ath10k wifi
 c. ubi sysupgrade

UnTested
 dwc3 usb has not been validated on IPQ board(AP148)

3)Known Issues:
 Once we flash ubi image on AP148, and if we reset the board, uboot on
 first boot creates PEB and LEB for dynamic sized partitions, which is incorrect
 and not what linux expects which causes errors when trying to mount rootfs.
 In order to test this, we can use the below steps:
  a. Flash the ubi image on board and don't reset the board
  b. load the kernel fit image in RAM and boot from there.

Signed-off-by: Ram Chandra Jangir <rjangi@codeaurora.org>

1 files changed, 158 insertions, 0 deletions

diff --git a/target/linux/ipq806x/patches-4.4/136-clk-Add-safe-switch-hook.patch b/target/linux/ipq806x/patches-4.4/136-clk-Add-safe-switch-hook.patch
new file mode 100644
index 0000000000..e969f6bca4
--- /dev/null
+++ b/target/linux/ipq806x/patches-4.4/136-clk-Add-safe-switch-hook.patch
@@ -0,0 +1,158 @@
+From f7a00ea959be31f9b742042294a359d508edce94 Mon Sep 17 00:00:00 2001
+From: Stephen Boyd <sboyd@codeaurora.org>
+Date: Fri, 20 Mar 2015 23:45:23 -0700
+Subject: [PATCH] clk: Add safe switch hook
+
+Sometimes clocks can't accept their parent source turning off
+while the source is reprogrammed to a different rate. Most
+notably CPU clocks require a way to switch away from the current
+PLL they're running on, reprogram that PLL to a new rate, and
+then switch back to the PLL with the new rate once they're done.
+Add a hook that drivers can implement allowing them to return a
+'safe parent' that they can switch their parent to while the
+upstream source is reprogrammed to support this.
+
+Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
+Signed-off-by: Ram Chandra Jangir <rjangi@codeaurora.org>
+---
+ drivers/clk/clk.c            | 61 ++++++++++++++++++++++++++++++++++++++------
+ include/linux/clk-provider.h |  1 +
+ 2 files changed, 54 insertions(+), 8 deletions(-)
+
+diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
+index 8404c3c..a29319a 100644
+--- a/drivers/clk/clk.c
++++ b/drivers/clk/clk.c
+@@ -51,9 +51,12 @@ struct clk_core {
+ 	struct clk_core		**parents;
+ 	u8			num_parents;
+ 	u8			new_parent_index;
++	u8                      safe_parent_index;
+ 	unsigned long		rate;
+ 	unsigned long		req_rate;
++	unsigned long           old_rate;
+ 	unsigned long		new_rate;
++	struct clk_core         *safe_parent;
+ 	struct clk_core		*new_parent;
+ 	struct clk_core		*new_child;
+ 	unsigned long		flags;
+@@ -1271,7 +1274,8 @@ out:
+ static void clk_calc_subtree(struct clk_core *core, unsigned long new_rate,
+ 			     struct clk_core *new_parent, u8 p_index)
+ {
+-	struct clk_core *child;
++	struct clk_core *child, *parent;
++	struct clk_hw *parent_hw;
+ 
+ 	core->new_rate = new_rate;
+ 	core->new_parent = new_parent;
+@@ -1281,6 +1285,18 @@ static void clk_calc_subtree(struct clk_core *core, unsigned long new_rate,
+ 	if (new_parent && new_parent != core->parent)
+ 		new_parent->new_child = core;
+ 
++	if (core->ops->get_safe_parent) {
++		parent_hw = core->ops->get_safe_parent(core->hw);
++		if (parent_hw) {
++			parent = parent_hw->core;
++			p_index = clk_fetch_parent_index(core, parent);
++			core->safe_parent_index = p_index;
++			core->safe_parent = parent;
++		}
++	} else {
++		core->safe_parent = NULL;
++	}
++
+ 	hlist_for_each_entry(child, &core->children, child_node) {
+ 		child->new_rate = clk_recalc(child, new_rate);
+ 		clk_calc_subtree(child, child->new_rate, NULL, 0);
+@@ -1393,14 +1409,43 @@ static struct clk_core *clk_propagate_rate_change(struct clk_core *core,
+ 						  unsigned long event)
+ {
+ 	struct clk_core *child, *tmp_clk, *fail_clk = NULL;
++	struct clk_core *old_parent;
+ 	int ret = NOTIFY_DONE;
+ 
+-	if (core->rate == core->new_rate)
++	if (core->rate == core->new_rate && event != POST_RATE_CHANGE)
+ 		return NULL;
+ 
++	switch (event) {
++	case PRE_RATE_CHANGE:
++		if (core->safe_parent)
++			core->ops->set_parent(core->hw, core->safe_parent_index);
++		core->old_rate = core->rate;
++		break;
++	case POST_RATE_CHANGE:
++		if (core->safe_parent) {
++			old_parent = __clk_set_parent_before(core,
++							    core->new_parent);
++			if (core->ops->set_rate_and_parent) {
++				core->ops->set_rate_and_parent(core->hw,
++						core->new_rate,
++						core->new_parent ?
++						core->new_parent->rate : 0,
++						core->new_parent_index);
++			} else if (core->ops->set_parent) {
++				core->ops->set_parent(core->hw,
++						core->new_parent_index);
++			}
++			__clk_set_parent_after(core, core->new_parent,
++						old_parent);
++		}
++		break;
++	}
++
+ 	if (core->notifier_count) {
+-		ret = __clk_notify(core, event, core->rate, core->new_rate);
+-		if (ret & NOTIFY_STOP_MASK)
++		if (event != POST_RATE_CHANGE || core->old_rate != core->rate)
++			ret = __clk_notify(core, event, core->old_rate,
++					   core->new_rate);
++		if (ret & NOTIFY_STOP_MASK && event != POST_RATE_CHANGE)
+ 			fail_clk = core;
+ 	}
+ 
+@@ -1446,7 +1491,8 @@ clk_change_rate(struct clk_core *core, unsigned long best_parent_rate)
+ 
+ 	old_rate = core->rate;
+ 
+-	if (core->new_parent && core->new_parent != core->parent) {
++	if (core->new_parent && core->new_parent != core->parent &&
++			!core->safe_parent) {
+ 		old_parent = __clk_set_parent_before(core, core->new_parent);
+ 		trace_clk_set_parent(core, core->new_parent);
+ 
+@@ -1472,9 +1518,6 @@ clk_change_rate(struct clk_core *core, unsigned long best_parent_rate)
+ 
+ 	core->rate = core->new_rate;
+ 
+-	if (core->notifier_count && old_rate != core->rate)
+-		__clk_notify(core, POST_RATE_CHANGE, old_rate, core->rate);
+-
+ 	if (core->flags & CLK_RECALC_NEW_RATES)
+ 		(void)clk_calc_new_rates(core, core->new_rate);
+ 
+@@ -1537,6 +1580,8 @@ static int clk_core_set_rate_nolock(struct clk_core *core,
+ 
+ 	core->req_rate = req_rate;
+ 
++	clk_propagate_rate_change(top, POST_RATE_CHANGE);
++
+ 	return ret;
+ }
+ 
+diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
+index b6b17b5..5d49262 100644
+--- a/include/linux/clk-provider.h
++++ b/include/linux/clk-provider.h
+@@ -202,6 +202,7 @@ struct clk_ops {
+ 					  struct clk_rate_request *req);
+ 	int		(*set_parent)(struct clk_hw *hw, u8 index);
+ 	u8		(*get_parent)(struct clk_hw *hw);
++	struct clk_hw   *(*get_safe_parent)(struct clk_hw *hw);
+ 	int		(*set_rate)(struct clk_hw *hw, unsigned long rate,
+ 				    unsigned long parent_rate);
+ 	int		(*set_rate_and_parent)(struct clk_hw *hw,
+-- 
+2.7.2
+