target/linux/ipq806x/patches-4.4/001-add-API-register-brd-clks-bckwrds-cmptblt.patch

   1 From ee15faffef11309219aa87a24efc86f6dd13f7cb Mon Sep 17 00:00:00 2001
   2 From: Stephen Boyd <sboyd@codeaurora.org>
   3 Date: Mon, 26 Oct 2015 17:11:32 -0700
   4 Subject: clk: qcom: common: Add API to register board clocks backwards
   5  compatibly
   6
   7 We want to put the XO board clocks into the dt files, but we also
   8 need to be backwards compatible with an older dtb. Add an API to
   9 the common code to do this. This also makes a place for us to
  10 handle the case when the RPM clock driver is enabled and we don't
  11 want to register the fixed factor clock.
  12
  13 Cc: Georgi Djakov <georgi.djakov@linaro.org>
  14 Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
  15 ---
  16  drivers/clk/qcom/common.c | 87 +++++++++++++++++++++++++++++++++++++++++++++++
  17  drivers/clk/qcom/common.h |  4 +++
  18  2 files changed, 91 insertions(+)
  19
  20 --- a/drivers/clk/qcom/common.c
  21 +++ b/drivers/clk/qcom/common.c
  22 @@ -17,6 +17,7 @@
  23  #include <linux/platform_device.h>
  24  #include <linux/clk-provider.h>
  25  #include <linux/reset-controller.h>
  26 +#include <linux/of.h>
  27
  28  #include "common.h"
  29  #include "clk-rcg.h"
  30 @@ -88,6 +89,92 @@ static void qcom_cc_gdsc_unregister(void
  31         gdsc_unregister(data);
  32  }
  33
  34 +/*
  35 + * Backwards compatibility with old DTs. Register a pass-through factor 1/1
  36 + * clock to translate 'path' clk into 'name' clk and regsiter the 'path'
  37 + * clk as a fixed rate clock if it isn't present.
  38 + */
  39 +static int _qcom_cc_register_board_clk(struct device *dev, const char *path,
  40 +                                      const char *name, unsigned long rate,
  41 +                                      bool add_factor)
  42 +{
  43 +       struct device_node *node = NULL;
  44 +       struct device_node *clocks_node;
  45 +       struct clk_fixed_factor *factor;
  46 +       struct clk_fixed_rate *fixed;
  47 +       struct clk *clk;
  48 +       struct clk_init_data init_data = { };
  49 +
  50 +       clocks_node = of_find_node_by_path("/clocks");
  51 +       if (clocks_node)
  52 +               node = of_find_node_by_name(clocks_node, path);
  53 +       of_node_put(clocks_node);
  54 +
  55 +       if (!node) {
  56 +               fixed = devm_kzalloc(dev, sizeof(*fixed), GFP_KERNEL);
  57 +               if (!fixed)
  58 +                       return -EINVAL;
  59 +
  60 +               fixed->fixed_rate = rate;
  61 +               fixed->hw.init = &init_data;
  62 +
  63 +               init_data.name = path;
  64 +               init_data.flags = CLK_IS_ROOT;
  65 +               init_data.ops = &clk_fixed_rate_ops;
  66 +
  67 +               clk = devm_clk_register(dev, &fixed->hw);
  68 +               if (IS_ERR(clk))
  69 +                       return PTR_ERR(clk);
  70 +       }
  71 +       of_node_put(node);
  72 +
  73 +       if (add_factor) {
  74 +               factor = devm_kzalloc(dev, sizeof(*factor), GFP_KERNEL);
  75 +               if (!factor)
  76 +                       return -EINVAL;
  77 +
  78 +               factor->mult = factor->div = 1;
  79 +               factor->hw.init = &init_data;
  80 +
  81 +               init_data.name = name;
  82 +               init_data.parent_names = &path;
  83 +               init_data.num_parents = 1;
  84 +               init_data.flags = 0;
  85 +               init_data.ops = &clk_fixed_factor_ops;
  86 +
  87 +               clk = devm_clk_register(dev, &factor->hw);
  88 +               if (IS_ERR(clk))
  89 +                       return PTR_ERR(clk);
  90 +       }
  91 +
  92 +       return 0;
  93 +}
  94 +
  95 +int qcom_cc_register_board_clk(struct device *dev, const char *path,
  96 +                              const char *name, unsigned long rate)
  97 +{
  98 +       bool add_factor = true;
  99 +       struct device_node *node;
 100 +
 101 +       /* The RPM clock driver will add the factor clock if present */
 102 +       if (IS_ENABLED(CONFIG_QCOM_RPMCC)) {
 103 +               node = of_find_compatible_node(NULL, NULL, "qcom,rpmcc");
 104 +               if (of_device_is_available(node))
 105 +                       add_factor = false;
 106 +               of_node_put(node);
 107 +       }
 108 +
 109 +       return _qcom_cc_register_board_clk(dev, path, name, rate, add_factor);
 110 +}
 111 +EXPORT_SYMBOL_GPL(qcom_cc_register_board_clk);
 112 +
 113 +int qcom_cc_register_sleep_clk(struct device *dev)
 114 +{
 115 +       return _qcom_cc_register_board_clk(dev, "sleep_clk", "sleep_clk_src",
 116 +                                          32768, true);
 117 +}
 118 +EXPORT_SYMBOL_GPL(qcom_cc_register_sleep_clk);
 119 +
 120  int qcom_cc_really_probe(struct platform_device *pdev,
 121                          const struct qcom_cc_desc *desc, struct regmap *regmap)
 122  {
 123 --- a/drivers/clk/qcom/common.h
 124 +++ b/drivers/clk/qcom/common.h
 125 @@ -37,6 +37,10 @@ extern const struct freq_tbl *qcom_find_
 126  extern int qcom_find_src_index(struct clk_hw *hw, const struct parent_map *map,
 127                                u8 src);
 128
 129 +extern int qcom_cc_register_board_clk(struct device *dev, const char *path,
 130 +                                     const char *name, unsigned long rate);
 131 +extern int qcom_cc_register_sleep_clk(struct device *dev);
 132 +
 133  extern struct regmap *qcom_cc_map(struct platform_device *pdev,
 134                                   const struct qcom_cc_desc *desc);
 135  extern int qcom_cc_really_probe(struct platform_device *pdev,