target/linux/ipq806x/patches-4.4/141-clk-qcom-Add-KPSS-ACC-GCC-driver.patch

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   4 Subject: [v3,10/13] clk: qcom: Add KPSS ACC/GCC driver
   5 From: Stephen Boyd <sboyd@codeaurora.org>
   6 X-Patchwork-Id: 6063201
   7 Message-Id: <1426920332-9340-11-git-send-email-sboyd@codeaurora.org>
   8 To: Mike Turquette <mturquette@linaro.org>, Stephen Boyd <sboyd@codeaurora.org>
   9 Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
  10         linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
  11         Viresh Kumar <viresh.kumar@linaro.org>, <devicetree@vger.kernel.org>
  12 Date: Fri, 20 Mar 2015 23:45:29 -0700
  13
  14 The ACC and GCC regions present in KPSSv1 contain registers to
  15 control clocks and power to each Krait CPU and L2. For CPUfreq
  16 purposes probe these devices and expose a mux clock that chooses
  17 between PXO and PLL8.
  18
  19 Cc: <devicetree@vger.kernel.org>
  20 Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
  21
  22 ---
  23 .../devicetree/bindings/arm/msm/qcom,kpss-acc.txt  |  7 ++
  24  .../devicetree/bindings/arm/msm/qcom,kpss-gcc.txt  | 28 +++++++
  25  drivers/clk/qcom/Kconfig                           |  8 ++
  26  drivers/clk/qcom/Makefile                          |  1 +
  27  drivers/clk/qcom/kpss-xcc.c                        | 95 ++++++++++++++++++++++
  28  5 files changed, 139 insertions(+)
  29  create mode 100644 Documentation/devicetree/bindings/arm/msm/qcom,kpss-gcc.txt
  30  create mode 100644 drivers/clk/qcom/kpss-xcc.c
  31
  32 --- a/Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.txt
  33 +++ b/Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.txt
  34 @@ -21,10 +21,17 @@
  35                     the register region. An optional second element specifies
  36                     the base address and size of the alias register region.
  37
  38 +- clock-output-names:
  39 +       Usage: optional
  40 +       Value type: <string>
  41 +       Definition: Name of the output clock. Typically acpuX_aux where X is a
  42 +                   CPU number starting at 0.
  43 +
  44  Example:
  45
  46         clock-controller@2088000 {
  47                 compatible = "qcom,kpss-acc-v2";
  48                 reg = <0x02088000 0x1000>,
  49                       <0x02008000 0x1000>;
  50 +               clock-output-names = "acpu0_aux";
  51         };
  52 --- /dev/null
  53 +++ b/Documentation/devicetree/bindings/arm/msm/qcom,kpss-gcc.txt
  54 @@ -0,0 +1,28 @@
  55 +Krait Processor Sub-system (KPSS) Global Clock Controller (GCC)
  56 +
  57 +PROPERTIES
  58 +
  59 +- compatible:
  60 +       Usage: required
  61 +       Value type: <string>
  62 +       Definition: should be one of:
  63 +                       "qcom,kpss-gcc"
  64 +
  65 +- reg:
  66 +       Usage: required
  67 +       Value type: <prop-encoded-array>
  68 +       Definition: base address and size of the register region
  69 +
  70 +- clock-output-names:
  71 +       Usage: required
  72 +       Value type: <string>
  73 +       Definition: Name of the output clock. Typically acpu_l2_aux indicating
  74 +                   an L2 cache auxiliary clock.
  75 +
  76 +Example:
  77 +
  78 +       l2cc: clock-controller@2011000 {
  79 +               compatible = "qcom,kpss-gcc";
  80 +               reg = <0x2011000 0x1000>;
  81 +               clock-output-names = "acpu_l2_aux";
  82 +       };
  83 --- a/drivers/clk/qcom/Kconfig
  84 +++ b/drivers/clk/qcom/Kconfig
  85 @@ -115,6 +115,14 @@
  86           Say Y if you want to support CPU frequency scaling on devices
  87           such as MSM8974, APQ8084, etc.
  88
  89 +config KPSS_XCC
  90 +       tristate "KPSS Clock Controller"
  91 +       depends on COMMON_CLK_QCOM
  92 +       help
  93 +         Support for the Krait ACC and GCC clock controllers. Say Y
  94 +         if you want to support CPU frequency scaling on devices such
  95 +         as MSM8960, APQ8064, etc.
  96 +
  97  config KRAIT_CLOCKS
  98         bool
  99         select KRAIT_L2_ACCESSORS
 100 --- a/drivers/clk/qcom/Makefile
 101 +++ b/drivers/clk/qcom/Makefile
 102 @@ -9,6 +9,7 @@
 103  clk-qcom-y += clk-regmap-divider.o
 104  clk-qcom-y += clk-regmap-mux.o
 105  clk-qcom-$(CONFIG_KRAIT_CLOCKS) += clk-krait.o
 106 +obj-$(CONFIG_KPSS_XCC) += kpss-xcc.o
 107  clk-qcom-y += clk-hfpll.o
 108  clk-qcom-y += reset.o
 109  clk-qcom-$(CONFIG_QCOM_GDSC) += gdsc.o
 110 --- /dev/null
 111 +++ b/drivers/clk/qcom/kpss-xcc.c
 112 @@ -0,0 +1,95 @@
 113 +/* Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
 114 + *
 115 + * This program is free software; you can redistribute it and/or modify
 116 + * it under the terms of the GNU General Public License version 2 and
 117 + * only version 2 as published by the Free Software Foundation.
 118 + *
 119 + * This program is distributed in the hope that it will be useful,
 120 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
 121 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 122 + * GNU General Public License for more details.
 123 + */
 124 +
 125 +#include <linux/kernel.h>
 126 +#include <linux/init.h>
 127 +#include <linux/module.h>
 128 +#include <linux/platform_device.h>
 129 +#include <linux/err.h>
 130 +#include <linux/io.h>
 131 +#include <linux/of.h>
 132 +#include <linux/of_device.h>
 133 +#include <linux/clk.h>
 134 +#include <linux/clk-provider.h>
 135 +
 136 +static const char *aux_parents[] = {
 137 +       "pll8_vote",
 138 +       "pxo",
 139 +};
 140 +
 141 +static unsigned int aux_parent_map[] = {
 142 +       3,
 143 +       0,
 144 +};
 145 +
 146 +static const struct of_device_id kpss_xcc_match_table[] = {
 147 +       { .compatible = "qcom,kpss-acc-v1", .data = (void *)1UL },
 148 +       { .compatible = "qcom,kpss-gcc" },
 149 +       {}
 150 +};
 151 +MODULE_DEVICE_TABLE(of, kpss_xcc_match_table);
 152 +
 153 +static int kpss_xcc_driver_probe(struct platform_device *pdev)
 154 +{
 155 +       const struct of_device_id *id;
 156 +       struct clk *clk;
 157 +       struct resource *res;
 158 +       void __iomem *base;
 159 +       const char *name;
 160 +
 161 +       id = of_match_device(kpss_xcc_match_table, &pdev->dev);
 162 +       if (!id)
 163 +               return -ENODEV;
 164 +
 165 +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 166 +       base = devm_ioremap_resource(&pdev->dev, res);
 167 +       if (IS_ERR(base))
 168 +               return PTR_ERR(base);
 169 +
 170 +       if (id->data) {
 171 +               if (of_property_read_string_index(pdev->dev.of_node,
 172 +                                       "clock-output-names", 0, &name))
 173 +                       return -ENODEV;
 174 +               base += 0x14;
 175 +       } else {
 176 +               name = "acpu_l2_aux";
 177 +               base += 0x28;
 178 +       }
 179 +
 180 +       clk = clk_register_mux_table(&pdev->dev, name, aux_parents,
 181 +                                    ARRAY_SIZE(aux_parents), 0, base, 0, 0x3,
 182 +                                    0, aux_parent_map, NULL);
 183 +
 184 +       platform_set_drvdata(pdev, clk);
 185 +
 186 +       return PTR_ERR_OR_ZERO(clk);
 187 +}
 188 +
 189 +static int kpss_xcc_driver_remove(struct platform_device *pdev)
 190 +{
 191 +       clk_unregister_mux(platform_get_drvdata(pdev));
 192 +       return 0;
 193 +}
 194 +
 195 +static struct platform_driver kpss_xcc_driver = {
 196 +       .probe = kpss_xcc_driver_probe,
 197 +       .remove = kpss_xcc_driver_remove,
 198 +       .driver = {
 199 +               .name = "kpss-xcc",
 200 +               .of_match_table = kpss_xcc_match_table,
 201 +       },
 202 +};
 203 +module_platform_driver(kpss_xcc_driver);
 204 +
 205 +MODULE_DESCRIPTION("Krait Processor Sub System (KPSS) Clock Driver");
 206 +MODULE_LICENSE("GPL v2");
 207 +MODULE_ALIAS("platform:kpss-xcc");