ipq806x: remove support for kernel 4.19

The target uses 5.4 as default kernel since 04/2020.

Kernel 4.19 support is not really maintained anymore, and there has
been a lot of changes between 4.19 and 5.4 on this target. Despite,
new devices are typically added for 5.4 only anyway.

Thus, make maintaining of old stuff and reviewing of new stuff
easier by removing support for kernel 4.19.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

1 files changed, 0 insertions, 152 deletions

diff --git a/target/linux/ipq806x/patches-4.19/0034-0012-clk-qcom-Add-safe-switch-hook-for-krait-mux-clocks.patch b/target/linux/ipq806x/patches-4.19/0034-0012-clk-qcom-Add-safe-switch-hook-for-krait-mux-clocks.patch
deleted file mode 100644
index 847b4809a3..0000000000
--- a/target/linux/ipq806x/patches-4.19/0034-0012-clk-qcom-Add-safe-switch-hook-for-krait-mux-clocks.patch
+++ /dev/null
@@ -1,152 +0,0 @@
-From 77612720a2362230af726baa4149c40ec7a7fb05 Mon Sep 17 00:00:00 2001
-From: Sricharan R <sricharan@codeaurora.org>
-Date: Tue, 14 Aug 2018 17:42:31 +0530
-Subject: [PATCH 12/12] clk: qcom: Add safe switch hook for krait mux clocks
-
-When the Hfplls are reprogrammed during the rate change,
-the primary muxes which are sourced from the same hfpll
-for higher frequencies, needs to be switched to the 'safe
-secondary mux' as the parent for that small window. This
-is done by registering a clk notifier for the muxes and
-switching to the safe parent in the PRE_RATE_CHANGE notifier
-and back to the original parent in the POST_RATE_CHANGE notifier.
-
-Signed-off-by: Sricharan R <sricharan@codeaurora.org>
-Tested-by: Craig Tatlor <ctatlor97@gmail.com>
-Signed-off-by: Stephen Boyd <sboyd@kernel.org>
----
- drivers/clk/qcom/clk-krait.c |  2 ++
- drivers/clk/qcom/clk-krait.h |  3 ++
- drivers/clk/qcom/krait-cc.c  | 56 ++++++++++++++++++++++++++++++++++++
- 3 files changed, 61 insertions(+)
-
---- a/drivers/clk/qcom/clk-krait.c
-+++ b/drivers/clk/qcom/clk-krait.c
-@@ -50,6 +50,8 @@ static int krait_mux_set_parent(struct c
- 	if (__clk_is_enabled(hw->clk))
- 		__krait_mux_set_sel(mux, sel);
- 
-+	mux->reparent = true;
-+
- 	return 0;
- }
- 
---- a/drivers/clk/qcom/clk-krait.h
-+++ b/drivers/clk/qcom/clk-krait.h
-@@ -12,6 +12,9 @@ struct krait_mux_clk {
- 	u32		shift;
- 	u32		en_mask;
- 	bool		lpl;
-+	u8		safe_sel;
-+	u8		old_index;
-+	bool		reparent;
- 
- 	struct clk_hw	hw;
- 	struct notifier_block   clk_nb;
---- a/drivers/clk/qcom/krait-cc.c
-+++ b/drivers/clk/qcom/krait-cc.c
-@@ -26,6 +26,49 @@ static unsigned int pri_mux_map[] = {
- 	0,
- };
- 
-+/*
-+ * Notifier function for switching the muxes to safe parent
-+ * while the hfpll is getting reprogrammed.
-+ */
-+static int krait_notifier_cb(struct notifier_block *nb,
-+			     unsigned long event,
-+			     void *data)
-+{
-+	int ret = 0;
-+	struct krait_mux_clk *mux = container_of(nb, struct krait_mux_clk,
-+						 clk_nb);
-+	/* Switch to safe parent */
-+	if (event == PRE_RATE_CHANGE) {
-+		mux->old_index = krait_mux_clk_ops.get_parent(&mux->hw);
-+		ret = krait_mux_clk_ops.set_parent(&mux->hw, mux->safe_sel);
-+		mux->reparent = false;
-+	/*
-+	 * By the time POST_RATE_CHANGE notifier is called,
-+	 * clk framework itself would have changed the parent for the new rate.
-+	 * Only otherwise, put back to the old parent.
-+	 */
-+	} else if (event == POST_RATE_CHANGE) {
-+		if (!mux->reparent)
-+			ret = krait_mux_clk_ops.set_parent(&mux->hw,
-+							   mux->old_index);
-+	}
-+
-+	return notifier_from_errno(ret);
-+}
-+
-+static int krait_notifier_register(struct device *dev, struct clk *clk,
-+				   struct krait_mux_clk *mux)
-+{
-+	int ret = 0;
-+
-+	mux->clk_nb.notifier_call = krait_notifier_cb;
-+	ret = clk_notifier_register(clk, &mux->clk_nb);
-+	if (ret)
-+		dev_err(dev, "failed to register clock notifier: %d\n", ret);
-+
-+	return ret;
-+}
-+
- static int
- krait_add_div(struct device *dev, int id, const char *s, unsigned int offset)
- {
-@@ -70,6 +113,7 @@ static int
- krait_add_sec_mux(struct device *dev, int id, const char *s,
- 		  unsigned int offset, bool unique_aux)
- {
-+	int ret;
- 	struct krait_mux_clk *mux;
- 	static const char *sec_mux_list[] = {
- 		"acpu_aux",
-@@ -93,6 +137,7 @@ krait_add_sec_mux(struct device *dev, in
- 	mux->shift = 2;
- 	mux->parent_map = sec_mux_map;
- 	mux->hw.init = &init;
-+	mux->safe_sel = 0;
- 
- 	init.name = kasprintf(GFP_KERNEL, "krait%s_sec_mux", s);
- 	if (!init.name)
-@@ -108,6 +153,11 @@ krait_add_sec_mux(struct device *dev, in
- 
- 	clk = devm_clk_register(dev, &mux->hw);
- 
-+	ret = krait_notifier_register(dev, clk, mux);
-+	if (ret)
-+		goto unique_aux;
-+
-+unique_aux:
- 	if (unique_aux)
- 		kfree(sec_mux_list[0]);
- err_aux:
-@@ -119,6 +169,7 @@ static struct clk *
- krait_add_pri_mux(struct device *dev, int id, const char *s,
- 		  unsigned int offset)
- {
-+	int ret;
- 	struct krait_mux_clk *mux;
- 	const char *p_names[3];
- 	struct clk_init_data init = {
-@@ -139,6 +190,7 @@ krait_add_pri_mux(struct device *dev, in
- 	mux->lpl = id >= 0;
- 	mux->parent_map = pri_mux_map;
- 	mux->hw.init = &init;
-+	mux->safe_sel = 2;
- 
- 	init.name = kasprintf(GFP_KERNEL, "krait%s_pri_mux", s);
- 	if (!init.name)
-@@ -164,6 +216,10 @@ krait_add_pri_mux(struct device *dev, in
- 
- 	clk = devm_clk_register(dev, &mux->hw);
- 
-+	ret = krait_notifier_register(dev, clk, mux);
-+	if (ret)
-+		goto err_p3;
-+err_p3:
- 	kfree(p_names[2]);
- err_p2:
- 	kfree(p_names[1]);