target/linux/ipq806x/patches-4.14/0042-clk-qcom-Add-KPSS-ACC-GCC-driver.patch

   1 From patchwork Fri Dec  8 09:42:26 2017
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   5 Subject: [v4,08/12] clk: qcom: Add KPSS ACC/GCC driver
   6 From: Sricharan R <sricharan@codeaurora.org>
   7 X-Patchwork-Id: 10102023
   8 Message-Id: <1512726150-7204-9-git-send-email-sricharan@codeaurora.org>
   9 To: mturquette@baylibre.com, sboyd@codeaurora.org,
  10  devicetree@vger.kernel.org, linux-pm@vger.kernel.org,
  11  linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
  12  viresh.kumar@linaro.org, linux-arm-kernel@lists.infradead.org
  13 Cc: sricharan@codeaurora.org
  14 Date: Fri,  8 Dec 2017 15:12:26 +0530
  15
  16 From: Stephen Boyd <sboyd@codeaurora.org>
  17
  18 The ACC and GCC regions present in KPSSv1 contain registers to
  19 control clocks and power to each Krait CPU and L2. For CPUfreq
  20 purposes probe these devices and expose a mux clock that chooses
  21 between PXO and PLL8.
  22
  23 Cc: <devicetree@vger.kernel.org>
  24 Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
  25 ---
  26  .../devicetree/bindings/arm/msm/qcom,kpss-acc.txt  |  7 ++
  27  .../devicetree/bindings/arm/msm/qcom,kpss-gcc.txt  | 28 +++++++
  28  drivers/clk/qcom/Kconfig                           |  8 ++
  29  drivers/clk/qcom/Makefile                          |  1 +
  30  drivers/clk/qcom/kpss-xcc.c                        | 96 ++++++++++++++++++++++
  31  5 files changed, 140 insertions(+)
  32  create mode 100644 Documentation/devicetree/bindings/arm/msm/qcom,kpss-gcc.txt
  33  create mode 100644 drivers/clk/qcom/kpss-xcc.c
  34
  35 --- a/Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.txt
  36 +++ b/Documentation/devicetree/bindings/arm/msm/qcom,kpss-acc.txt
  37 @@ -21,10 +21,17 @@ PROPERTIES
  38                     the register region. An optional second element specifies
  39                     the base address and size of the alias register region.
  40
  41 +- clock-output-names:
  42 +       Usage: optional
  43 +       Value type: <string>
  44 +       Definition: Name of the output clock. Typically acpuX_aux where X is a
  45 +                   CPU number starting at 0.
  46 +
  47  Example:
  48
  49         clock-controller@2088000 {
  50                 compatible = "qcom,kpss-acc-v2";
  51                 reg = <0x02088000 0x1000>,
  52                       <0x02008000 0x1000>;
  53 +               clock-output-names = "acpu0_aux";
  54         };
  55 --- /dev/null
  56 +++ b/Documentation/devicetree/bindings/arm/msm/qcom,kpss-gcc.txt
  57 @@ -0,0 +1,28 @@
  58 +Krait Processor Sub-system (KPSS) Global Clock Controller (GCC)
  59 +
  60 +PROPERTIES
  61 +
  62 +- compatible:
  63 +       Usage: required
  64 +       Value type: <string>
  65 +       Definition: should be one of:
  66 +                       "qcom,kpss-gcc"
  67 +
  68 +- reg:
  69 +       Usage: required
  70 +       Value type: <prop-encoded-array>
  71 +       Definition: base address and size of the register region
  72 +
  73 +- clock-output-names:
  74 +       Usage: required
  75 +       Value type: <string>
  76 +       Definition: Name of the output clock. Typically acpu_l2_aux indicating
  77 +                   an L2 cache auxiliary clock.
  78 +
  79 +Example:
  80 +
  81 +       l2cc: clock-controller@2011000 {
  82 +               compatible = "qcom,kpss-gcc";
  83 +               reg = <0x2011000 0x1000>;
  84 +               clock-output-names = "acpu_l2_aux";
  85 +       };
  86 --- a/drivers/clk/qcom/Kconfig
  87 +++ b/drivers/clk/qcom/Kconfig
  88 @@ -205,6 +205,14 @@ config QCOM_HFPLL
  89           Say Y if you want to support CPU frequency scaling on devices
  90           such as MSM8974, APQ8084, etc.
  91
  92 +config KPSS_XCC
  93 +       tristate "KPSS Clock Controller"
  94 +       depends on COMMON_CLK_QCOM
  95 +       help
  96 +         Support for the Krait ACC and GCC clock controllers. Say Y
  97 +         if you want to support CPU frequency scaling on devices such
  98 +         as MSM8960, APQ8064, etc.
  99 +
 100  config KRAIT_CLOCKS
 101         bool
 102         select KRAIT_L2_ACCESSORS
 103 --- a/drivers/clk/qcom/Makefile
 104 +++ b/drivers/clk/qcom/Makefile
 105 @@ -36,4 +36,5 @@ obj-$(CONFIG_MSM_MMCC_8974) += mmcc-msm8
 106  obj-$(CONFIG_MSM_MMCC_8996) += mmcc-msm8996.o
 107  obj-$(CONFIG_QCOM_CLK_RPM) += clk-rpm.o
 108  obj-$(CONFIG_QCOM_CLK_SMD_RPM) += clk-smd-rpm.o
 109 +obj-$(CONFIG_KPSS_XCC) += kpss-xcc.o
 110  obj-$(CONFIG_QCOM_HFPLL) += hfpll.o
 111 --- /dev/null
 112 +++ b/drivers/clk/qcom/kpss-xcc.c
 113 @@ -0,0 +1,96 @@
 114 +/* Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
 115 + *
 116 + * This program is free software; you can redistribute it and/or modify
 117 + * it under the terms of the GNU General Public License version 2 and
 118 + * only version 2 as published by the Free Software Foundation.
 119 + *
 120 + * This program is distributed in the hope that it will be useful,
 121 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
 122 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 123 + * GNU General Public License for more details.
 124 + */
 125 +
 126 +#include <linux/kernel.h>
 127 +#include <linux/init.h>
 128 +#include <linux/module.h>
 129 +#include <linux/platform_device.h>
 130 +#include <linux/err.h>
 131 +#include <linux/io.h>
 132 +#include <linux/of.h>
 133 +#include <linux/of_device.h>
 134 +#include <linux/clk.h>
 135 +#include <linux/clk-provider.h>
 136 +
 137 +static const char *aux_parents[] = {
 138 +       "pll8_vote",
 139 +       "pxo",
 140 +};
 141 +
 142 +static unsigned int aux_parent_map[] = {
 143 +       3,
 144 +       0,
 145 +};
 146 +
 147 +static const struct of_device_id kpss_xcc_match_table[] = {
 148 +       { .compatible = "qcom,kpss-acc-v1", .data = (void *)1UL },
 149 +       { .compatible = "qcom,kpss-gcc" },
 150 +       {}
 151 +};
 152 +MODULE_DEVICE_TABLE(of, kpss_xcc_match_table);
 153 +
 154 +static int kpss_xcc_driver_probe(struct platform_device *pdev)
 155 +{
 156 +       const struct of_device_id *id;
 157 +       struct clk *clk;
 158 +       struct resource *res;
 159 +       void __iomem *base;
 160 +       const char *name;
 161 +
 162 +       id = of_match_device(kpss_xcc_match_table, &pdev->dev);
 163 +       if (!id)
 164 +               return -ENODEV;
 165 +
 166 +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 167 +       base = devm_ioremap_resource(&pdev->dev, res);
 168 +       if (IS_ERR(base))
 169 +               return PTR_ERR(base);
 170 +
 171 +       if (id->data) {
 172 +               if (of_property_read_string_index(pdev->dev.of_node,
 173 +                                                 "clock-output-names",
 174 +                                                 0, &name))
 175 +                       return -ENODEV;
 176 +               base += 0x14;
 177 +       } else {
 178 +               name = "acpu_l2_aux";
 179 +               base += 0x28;
 180 +       }
 181 +
 182 +       clk = clk_register_mux_table(&pdev->dev, name, aux_parents,
 183 +                                    ARRAY_SIZE(aux_parents), 0, base, 0, 0x3,
 184 +                                    0, aux_parent_map, NULL);
 185 +
 186 +       platform_set_drvdata(pdev, clk);
 187 +
 188 +       return PTR_ERR_OR_ZERO(clk);
 189 +}
 190 +
 191 +static int kpss_xcc_driver_remove(struct platform_device *pdev)
 192 +{
 193 +       clk_unregister_mux(platform_get_drvdata(pdev));
 194 +       return 0;
 195 +}
 196 +
 197 +static struct platform_driver kpss_xcc_driver = {
 198 +       .probe = kpss_xcc_driver_probe,
 199 +       .remove = kpss_xcc_driver_remove,
 200 +       .driver = {
 201 +               .name = "kpss-xcc",
 202 +               .of_match_table = kpss_xcc_match_table,
 203 +       },
 204 +};
 205 +module_platform_driver(kpss_xcc_driver);
 206 +
 207 +MODULE_DESCRIPTION("Krait Processor Sub System (KPSS) Clock Driver");
 208 +MODULE_LICENSE("GPL v2");
 209 +MODULE_ALIAS("platform:kpss-xcc");