target/linux/ipq806x/patches/0173-cpufreq-Add-module-to-register-cpufreq-krait-device.patch

   1 From f1db56284b01b1212a211023dcaa7846fd07d0ec Mon Sep 17 00:00:00 2001
   2 From: Stephen Boyd <sboyd@codeaurora.org>
   3 Date: Fri, 30 May 2014 17:16:53 -0700
   4 Subject: [PATCH 173/182] cpufreq: Add module to register cpufreq-krait device
   5
   6 Register a cpufreq-krait device whenever we detect that a
   7 "qcom,krait" compatible CPU is present in DT.
   8
   9 Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
  10 ---
  11  drivers/cpufreq/Kconfig.arm    |    8 +++++++
  12  drivers/cpufreq/Makefile       |    1 +
  13  drivers/cpufreq/qcom-cpufreq.c |   48 ++++++++++++++++++++++++++++++++++++++++
  14  3 files changed, 57 insertions(+)
  15  create mode 100644 drivers/cpufreq/qcom-cpufreq.c
  16
  17 --- a/drivers/cpufreq/Kconfig.arm
  18 +++ b/drivers/cpufreq/Kconfig.arm
  19 @@ -123,6 +123,14 @@ config ARM_OMAP2PLUS_CPUFREQ
  20         depends on ARCH_OMAP2PLUS
  21         default ARCH_OMAP2PLUS
  22
  23 +config ARM_QCOM_CPUFREQ
  24 +       tristate "Qualcomm based"
  25 +       depends on ARCH_QCOM
  26 +       help
  27 +         This adds the CPUFreq driver for Qualcomm SoC based boards.
  28 +
  29 +         If in doubt, say N.
  30 +
  31  config ARM_S3C_CPUFREQ
  32         bool
  33         help
  34 --- a/drivers/cpufreq/Makefile
  35 +++ b/drivers/cpufreq/Makefile
  36 @@ -60,6 +60,7 @@ obj-$(CONFIG_ARM_IMX6Q_CPUFREQ)               += imx6
  37  obj-$(CONFIG_ARM_INTEGRATOR)           += integrator-cpufreq.o
  38  obj-$(CONFIG_ARM_KIRKWOOD_CPUFREQ)     += kirkwood-cpufreq.o
  39  obj-$(CONFIG_ARM_OMAP2PLUS_CPUFREQ)    += omap-cpufreq.o
  40 +obj-$(CONFIG_ARM_QCOM_CPUFREQ)         += qcom-cpufreq.o
  41  obj-$(CONFIG_PXA25x)                   += pxa2xx-cpufreq.o
  42  obj-$(CONFIG_PXA27x)                   += pxa2xx-cpufreq.o
  43  obj-$(CONFIG_PXA3xx)                   += pxa3xx-cpufreq.o
  44 --- /dev/null
  45 +++ b/drivers/cpufreq/qcom-cpufreq.c
  46 @@ -0,0 +1,48 @@
  47 +/* Copyright (c) 2014, The Linux Foundation. All rights reserved.
  48 + *
  49 + * This program is free software; you can redistribute it and/or modify
  50 + * it under the terms of the GNU General Public License version 2 and
  51 + * only version 2 as published by the Free Software Foundation.
  52 + *
  53 + * This program is distributed in the hope that it will be useful,
  54 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
  55 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  56 + * GNU General Public License for more details.
  57 + */
  58 +
  59 +#include <linux/kernel.h>
  60 +#include <linux/module.h>
  61 +#include <linux/cpu.h>
  62 +#include <linux/of.h>
  63 +#include <linux/platform_device.h>
  64 +#include <linux/err.h>
  65 +
  66 +static int qcom_cpufreq_driver_init(void)
  67 +{
  68 +       struct platform_device_info devinfo = { .name = "cpufreq-krait", };
  69 +       struct device *cpu_dev;
  70 +       struct device_node *np;
  71 +       struct platform_device *pdev;
  72 +
  73 +       cpu_dev = get_cpu_device(0);
  74 +       if (!cpu_dev)
  75 +               return -ENODEV;
  76 +
  77 +       np = of_node_get(cpu_dev->of_node);
  78 +       if (!np)
  79 +               return -ENOENT;
  80 +
  81 +       if (!of_device_is_compatible(np, "qcom,krait")) {
  82 +               of_node_put(np);
  83 +               return -ENODEV;
  84 +       }
  85 +       of_node_put(np);
  86 +
  87 +       pdev = platform_device_register_full(&devinfo);
  88 +
  89 +       return PTR_ERR_OR_ZERO(pdev);
  90 +}
  91 +module_init(qcom_cpufreq_driver_init);
  92 +
  93 +MODULE_DESCRIPTION("Qualcomm CPUfreq driver");
  94 +MODULE_LICENSE("GPL v2");