ipq806x: add & enable cpufreq support

This change set enables frequency scaling on ipq806x, which speeds-up
the CPU and allows it to achieve its max frequency.

These patches are cherry-picked & backported from the following location:
*130-132: linux-next
*133-143: LKML - https://lkml.org/lkml/2015/3/21/15
*144: derived from other qcom similar dts
*145: derived from https://chromium.googlesource.com/chromiumos/third_party/kernel/+/chromeos-3.14/drivers/cpufreq/cpufreq-krait.c

Signed-off-by: Mathieu Olivari <mathieu@codeaurora.org>

SVN-Revision: 45730

1 files changed, 205 insertions, 0 deletions

diff --git a/target/linux/ipq806x/patches-3.18/141-clk-qcom-Add-KPSS-ACC-GCC-driver.patch b/target/linux/ipq806x/patches-3.18/141-clk-qcom-Add-KPSS-ACC-GCC-driver.patch
new file mode 100644
index 0000000..06b14d8
--- /dev/null
+++ b/target/linux/ipq806x/patches-3.18/141-clk-qcom-Add-KPSS-ACC-GCC-driver.patch
@@ -0,0 +1,205 @@
+Content-Type: text/plain; charset="utf-8"
+MIME-Version: 1.0
+Content-Transfer-Encoding: 7bit
+Subject: [v3,10/13] clk: qcom: Add KPSS ACC/GCC driver
+From: Stephen Boyd <sboyd@codeaurora.org>
+X-Patchwork-Id: 6063201
+Message-Id: <1426920332-9340-11-git-send-email-sboyd@codeaurora.org>
+To: Mike Turquette <mturquette@linaro.org>, Stephen Boyd <sboyd@codeaurora.org>
+Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
+	linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
+	Viresh Kumar <viresh.kumar@linaro.org>, <devicetree@vger.kernel.org>
+Date: Fri, 20 Mar 2015 23:45:29 -0700
+
+The ACC and GCC regions present in KPSSv1 contain registers to
+control clocks and power to each Krait CPU and L2. For CPUfreq
+purposes probe these devices and expose a mux clock that chooses
+between PXO and PLL8.
+
+Cc: <devicetree@vger.kernel.org>
+Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
+
+---
+.../devicetree/bindings/arm/msm/qcom,kpss-acc.txt  |  7 ++
+ .../devicetree/bindings/arm/msm/qcom,kpss-gcc.txt  | 28 +++++++
+ drivers/clk/qcom/Kconfig                           |  8 ++
+ drivers/clk/qcom/Makefile                          |  1 +
+ drivers/clk/qcom/kpss-xcc.c                        | 95 ++++++++++++++++++++++
+ 5 files changed, 139 insertions(+)
+ create mode 100644 Documentation/devicetree/bindings/arm/msm/qcom,kpss-gcc.txt
+ create mode 100644 drivers/clk/qcom/kpss-xcc.c
+
+--- a/Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.txt
++++ b/Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.txt
+@@ -21,10 +21,17 @@ PROPERTIES
+ 		    the register region. An optional second element specifies
+ 		    the base address and size of the alias register region.
+ 
++- clock-output-names:
++	Usage: optional
++	Value type: <string>
++	Definition: Name of the output clock. Typically acpuX_aux where X is a
++		    CPU number starting at 0.
++
+ Example:
+ 
+ 	clock-controller@2088000 {
+ 		compatible = "qcom,kpss-acc-v2";
+ 		reg = <0x02088000 0x1000>,
+ 		      <0x02008000 0x1000>;
++		clock-output-names = "acpu0_aux";
+ 	};
+--- /dev/null
++++ b/Documentation/devicetree/bindings/arm/msm/qcom,kpss-gcc.txt
+@@ -0,0 +1,28 @@
++Krait Processor Sub-system (KPSS) Global Clock Controller (GCC)
++
++PROPERTIES
++
++- compatible:
++	Usage: required
++	Value type: <string>
++	Definition: should be one of:
++			"qcom,kpss-gcc"
++
++- reg:
++	Usage: required
++	Value type: <prop-encoded-array>
++	Definition: base address and size of the register region
++
++- clock-output-names:
++	Usage: required
++	Value type: <string>
++	Definition: Name of the output clock. Typically acpu_l2_aux indicating
++		    an L2 cache auxiliary clock.
++
++Example:
++
++	l2cc: clock-controller@2011000 {
++		compatible = "qcom,kpss-gcc";
++		reg = <0x2011000 0x1000>;
++		clock-output-names = "acpu_l2_aux";
++	};
+--- a/drivers/clk/qcom/Kconfig
++++ b/drivers/clk/qcom/Kconfig
+@@ -79,6 +79,14 @@ config QCOM_HFPLL
+ 	  Say Y if you want to support CPU frequency scaling on devices
+ 	  such as MSM8974, APQ8084, etc.
+ 
++config KPSS_XCC
++	tristate "KPSS Clock Controller"
++	depends on COMMON_CLK_QCOM
++	help
++	  Support for the Krait ACC and GCC clock controllers. Say Y
++	  if you want to support CPU frequency scaling on devices such
++	  as MSM8960, APQ8064, etc.
++
+ config KRAIT_CLOCKS
+ 	bool
+ 	select KRAIT_L2_ACCESSORS
+--- a/drivers/clk/qcom/Makefile
++++ b/drivers/clk/qcom/Makefile
+@@ -18,4 +18,5 @@ obj-$(CONFIG_MSM_GCC_8960) += gcc-msm896
+ obj-$(CONFIG_MSM_GCC_8974) += gcc-msm8974.o
+ obj-$(CONFIG_MSM_MMCC_8960) += mmcc-msm8960.o
+ obj-$(CONFIG_MSM_MMCC_8974) += mmcc-msm8974.o
++obj-$(CONFIG_KPSS_XCC) += kpss-xcc.o
+ obj-$(CONFIG_QCOM_HFPLL) += hfpll.o
+--- /dev/null
++++ b/drivers/clk/qcom/kpss-xcc.c
+@@ -0,0 +1,95 @@
++/* Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License version 2 and
++ * only version 2 as published by the Free Software Foundation.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
++ * GNU General Public License for more details.
++ */
++
++#include <linux/kernel.h>
++#include <linux/init.h>
++#include <linux/module.h>
++#include <linux/platform_device.h>
++#include <linux/err.h>
++#include <linux/io.h>
++#include <linux/of.h>
++#include <linux/of_device.h>
++#include <linux/clk.h>
++#include <linux/clk-provider.h>
++
++static const char *aux_parents[] = {
++	"pll8_vote",
++	"pxo",
++};
++
++static unsigned int aux_parent_map[] = {
++	3,
++	0,
++};
++
++static const struct of_device_id kpss_xcc_match_table[] = {
++	{ .compatible = "qcom,kpss-acc-v1", .data = (void *)1UL },
++	{ .compatible = "qcom,kpss-gcc" },
++	{}
++};
++MODULE_DEVICE_TABLE(of, kpss_xcc_match_table);
++
++static int kpss_xcc_driver_probe(struct platform_device *pdev)
++{
++	const struct of_device_id *id;
++	struct clk *clk;
++	struct resource *res;
++	void __iomem *base;
++	const char *name;
++
++	id = of_match_device(kpss_xcc_match_table, &pdev->dev);
++	if (!id)
++		return -ENODEV;
++
++	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++	base = devm_ioremap_resource(&pdev->dev, res);
++	if (IS_ERR(base))
++		return PTR_ERR(base);
++
++	if (id->data) {
++		if (of_property_read_string_index(pdev->dev.of_node,
++					"clock-output-names", 0, &name))
++			return -ENODEV;
++		base += 0x14;
++	} else {
++		name = "acpu_l2_aux";
++		base += 0x28;
++	}
++
++	clk = clk_register_mux_table(&pdev->dev, name, aux_parents,
++				     ARRAY_SIZE(aux_parents), 0, base, 0, 0x3,
++				     0, aux_parent_map, NULL);
++
++	platform_set_drvdata(pdev, clk);
++
++	return PTR_ERR_OR_ZERO(clk);
++}
++
++static int kpss_xcc_driver_remove(struct platform_device *pdev)
++{
++	clk_unregister_mux(platform_get_drvdata(pdev));
++	return 0;
++}
++
++static struct platform_driver kpss_xcc_driver = {
++	.probe = kpss_xcc_driver_probe,
++	.remove = kpss_xcc_driver_remove,
++	.driver = {
++		.name = "kpss-xcc",
++		.of_match_table = kpss_xcc_match_table,
++	},
++};
++module_platform_driver(kpss_xcc_driver);
++
++MODULE_DESCRIPTION("Krait Processor Sub System (KPSS) Clock Driver");
++MODULE_LICENSE("GPL v2");
++MODULE_ALIAS("platform:kpss-xcc");