target/linux/bcm27xx/patches-5.15/950-0850-clk-Introduce-clk_hw_init_rate_request.patch

   1 From 7023dd1743aa6bb305fdce96e6e80eecc6e01f16 Mon Sep 17 00:00:00 2001
   2 From: Maxime Ripard <maxime@cerno.tech>
   3 Date: Sat, 2 Apr 2022 14:49:56 +0200
   4 Subject: [PATCH] clk: Introduce clk_hw_init_rate_request()
   5
   6 Some drivers (at91, imx, qcom) use __clk_determine_rate directly, and
   7 thus will need to initialise a clk_rate_request structure.
   8
   9 However, drivers don't have access to the function that the core uses to
  10 initialize that structure which could prove to be useful.
  11
  12 Let's create a function for clock providers that will initialize a
  13 clk_rate_request for a given clk_hw pointer and a rate.
  14
  15 Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com> # imx8mp
  16 Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> # exynos4210, meson g12b
  17 Signed-off-by: Maxime Ripard <maxime@cerno.tech>
  18 ---
  19  drivers/clk/clk.c            | 20 ++++++++++++++++++++
  20  include/linux/clk-provider.h |  6 ++++++
  21  2 files changed, 26 insertions(+)
  22
  23 --- a/drivers/clk/clk.c
  24 +++ b/drivers/clk/clk.c
  25 @@ -1395,6 +1395,26 @@ static void clk_core_init_rate_req(struc
  26         }
  27  }
  28
  29 +/**
  30 + * clk_hw_init_rate_request - Initializes a clk_rate_request
  31 + * @hw: the clk for which we want to submit a rate request
  32 + * @req: the clk_rate_request structure we want to initialise
  33 + * @rate: the rate which is to be requested
  34 + *
  35 + * Initializes and fills a clk_rate_request structure to submit to
  36 + * __clk_determine_rate or similar functions.
  37 + */
  38 +void clk_hw_init_rate_request(struct clk_hw * const hw,
  39 +                             struct clk_rate_request *req,
  40 +                             unsigned long rate)
  41 +{
  42 +       if (WARN_ON(!hw || !req))
  43 +               return;
  44 +
  45 +       clk_core_init_rate_req(hw->core, req, rate);
  46 +}
  47 +EXPORT_SYMBOL_GPL(clk_hw_init_rate_request);
  48 +
  49  static bool clk_core_can_round(struct clk_core * const core)
  50  {
  51         return core->ops->determine_rate || core->ops->round_rate;
  52 --- a/include/linux/clk-provider.h
  53 +++ b/include/linux/clk-provider.h
  54 @@ -42,6 +42,8 @@ struct dentry;
  55   * struct clk_rate_request - Structure encoding the clk constraints that
  56   * a clock user might require.
  57   *
  58 + * Should be initialized by calling clk_hw_init_rate_request().
  59 + *
  60   * @rate:              Requested clock rate. This field will be adjusted by
  61   *                     clock drivers according to hardware capabilities.
  62   * @min_rate:          Minimum rate imposed by clk users.
  63 @@ -60,6 +62,10 @@ struct clk_rate_request {
  64         struct clk_hw *best_parent_hw;
  65  };
  66
  67 +void clk_hw_init_rate_request(struct clk_hw * const hw,
  68 +                             struct clk_rate_request *req,
  69 +                             unsigned long rate);
  70 +
  71  /**
  72   * struct clk_duty - Struture encoding the duty cycle ratio of a clock
  73   *