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, 161 deletions

diff --git a/target/linux/ipq806x/patches-4.19/0055-cpufreq-dt-Add-L2-frequency-scaling-support.patch b/target/linux/ipq806x/patches-4.19/0055-cpufreq-dt-Add-L2-frequency-scaling-support.patch
deleted file mode 100644
index 5f54120b3a..0000000000
--- a/target/linux/ipq806x/patches-4.19/0055-cpufreq-dt-Add-L2-frequency-scaling-support.patch
+++ /dev/null
@@ -1,161 +0,0 @@
---- a/drivers/cpufreq/cpufreq-dt.c
-+++ b/drivers/cpufreq/cpufreq-dt.c
-@@ -48,16 +48,71 @@ static int set_target(struct cpufreq_pol
- {
- 	struct private_data *priv = policy->driver_data;
- 	unsigned long freq = policy->freq_table[index].frequency;
-+	struct clk *l2_clk = policy->l2_clk;
-+	struct regulator *l2_regulator = policy->l2_regulator;
-+	unsigned long l2_freq, target_l2_freq;
-+	unsigned long l2_vol, target_l2_vol;
-+	unsigned long target_freq;
- 	int ret;
- 
- 	mutex_lock(&priv->lock);
- 	ret = dev_pm_opp_set_rate(priv->cpu_dev, freq * 1000);
- 
- 	if (!ret) {
-+		if (policy->l2_rate_set) {
-+			static unsigned long krait_l2[CONFIG_NR_CPUS] = { };
-+			int cpu, l2_index, tol = 0;
-+
-+			target_freq = freq * 1000;
-+
-+			krait_l2[policy->cpu] = target_freq;
-+			for_each_present_cpu(cpu)
-+				target_freq = max(target_freq, krait_l2[cpu]);
-+
-+			for (l2_index = 2; l2_index >= 0; l2_index--)
-+				if (target_freq >= policy->l2_cpufreq[l2_index])
-+					break;
-+
-+			l2_freq = clk_get_rate(l2_clk);
-+			target_l2_freq = policy->l2_rate[l2_index];
-+
-+			if (l2_freq != target_l2_freq) {
-+
-+				/*
-+				 * Set to idle bin if switching from normal to high bin 
-+				 * or vice versa
-+				 */
-+				if ( (l2_index == 2 && l2_freq == policy->l2_rate[1]) ||
-+					 (l2_index == 1 && l2_freq == policy->l2_rate[2]) ) {
-+					ret = clk_set_rate(l2_clk, policy->l2_rate[0]);
-+					if (ret)
-+						goto exit;
-+				}
-+				/* scale l2 with the core */
-+				ret = clk_set_rate(l2_clk, target_l2_freq);
-+				if (ret)
-+					goto exit;
-+
-+				if (policy->l2_volt_set) {
-+
-+					l2_vol = regulator_get_voltage(l2_regulator);
-+					target_l2_vol = policy->l2_volt[l2_index];
-+
-+					if (l2_vol != target_l2_vol) {
-+						tol = target_l2_vol * policy->l2_volt_tol / 100;
-+						ret = regulator_set_voltage_tol(l2_regulator,target_l2_vol,tol);
-+						if (ret)
-+							goto exit;
-+					}
-+				}
-+			}
-+		}
- 		priv->opp_freq = freq * 1000;
- 		arch_set_freq_scale(policy->related_cpus, freq,
- 				    policy->cpuinfo.max_freq);
- 	}
-+
-+exit:
- 	mutex_unlock(&priv->lock);
- 
- 	return ret;
-@@ -200,6 +255,9 @@ static int cpufreq_init(struct cpufreq_p
- 	bool fallback = false;
- 	const char *name;
- 	int ret;
-+	struct device_node *np, *l2_np;
-+	struct clk *l2_clk = NULL;
-+	struct regulator *l2_regulator = NULL;
- 
- 	cpu_dev = get_cpu_device(policy->cpu);
- 	if (!cpu_dev) {
-@@ -307,6 +365,57 @@ static int cpufreq_init(struct cpufreq_p
- 
- 	policy->suspend_freq = dev_pm_opp_get_suspend_opp_freq(cpu_dev) / 1000;
- 
-+	policy->l2_rate_set = false;
-+	policy->l2_volt_set = false;
-+
-+	l2_clk = clk_get(cpu_dev, "l2");
-+	if (!IS_ERR(l2_clk))
-+		policy->l2_clk = l2_clk;
-+
-+	l2_np = of_find_node_by_name(NULL, "qcom,l2");
-+	if (l2_np) {
-+		struct device_node *vdd;
-+		np = of_node_get(priv->cpu_dev->of_node);
-+
-+		if (np)
-+			of_property_read_u32(np, "voltage-tolerance", &policy->l2_volt_tol);
-+
-+		of_property_read_u32_array(l2_np, "qcom,l2-rates", policy->l2_rate, 3);
-+		if (policy->l2_rate[0] && policy->l2_rate[1] && policy->l2_rate[2]) {
-+			policy->l2_rate_set = true;
-+			of_property_read_u32_array(l2_np, "qcom,l2-cpufreq", policy->l2_cpufreq, 3);
-+			of_property_read_u32_array(l2_np, "qcom,l2-volt", policy->l2_volt, 3);
-+		} else
-+			pr_warn("L2: failed to parse L2 rates\n");
-+
-+		if (!policy->l2_cpufreq[0] && !policy->l2_cpufreq[1] && 
-+			!policy->l2_cpufreq[2] && policy->l2_rate_set) {
-+			int i;
-+
-+			pr_warn("L2: failed to parse target cpu freq, using defaults\n");
-+			for (i = 0; i < 3; i++)
-+				policy->l2_cpufreq[i] = policy->l2_rate[i];
-+		}
-+
-+		if (policy->l2_volt[0] && policy->l2_volt[1] && policy->l2_volt[2] &&
-+			policy->l2_volt_tol && policy->l2_rate_set) {
-+			vdd = of_parse_phandle(l2_np, "qcom,l2-supply", 0);
-+
-+			if (vdd) {
-+				l2_regulator = devm_regulator_get(cpu_dev, vdd->name);
-+				if (!IS_ERR(l2_regulator)) {
-+					policy->l2_regulator = l2_regulator;
-+					policy->l2_volt_set = true;
-+				} else {
-+					pr_warn("failed to get l2 supply\n");
-+					l2_regulator = NULL;
-+				}
-+
-+				of_node_put(vdd);
-+			}
-+		}
-+	}
-+
- 	/* Support turbo/boost mode */
- 	if (policy_has_boost_freq(policy)) {
- 		/* This gets disabled by core on driver unregister */
---- a/include/linux/cpufreq.h
-+++ b/include/linux/cpufreq.h
-@@ -72,7 +72,15 @@ struct cpufreq_policy {
- 						should set cpufreq */
- 	unsigned int		cpu;    /* cpu managing this policy, must be online */
- 
--	struct clk		*clk;
-+	struct clk			*clk;
-+	struct clk			*l2_clk; /* L2 clock */
-+	struct regulator	*l2_regulator; /* L2 supply */
-+	unsigned int		l2_rate[3]; /* L2 bus clock rate */
-+	bool				l2_rate_set;
-+	unsigned int		l2_cpufreq[3]; /* L2 target CPU frequency */
-+	unsigned int		l2_volt[3]; /* L2 voltage array */
-+	bool				l2_volt_set;
-+	unsigned int		l2_volt_tol; /* L2 voltage tolerance */
- 	struct cpufreq_cpuinfo	cpuinfo;/* see above */
- 
- 	unsigned int		min;    /* in kHz */