git.openwrt.org Git - openwrt/staging/neocturne.git/blob

   1 From cd4d6be5ed0488de2e0df9c388d89ad93d781caa Mon Sep 17 00:00:00 2001
   2 From: Weijie Gao <weijie.gao@mediatek.com>
   3 Date: Fri, 29 Jul 2022 10:57:05 +0800
   4 Subject: [PATCH 23/31] clk: mediatek: add support to configure clock driver
   5  parent
   6
   7 This patch adds support for a clock node to configure its parent clock
   8 where possible.
   9
  10 Reviewed-by: Simon Glass <sjg@chromium.org>
  11 Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
  12 ---
  13  drivers/clk/mediatek/clk-mtk.c | 79 ++++++++++++++++++++--------------
  14  drivers/clk/mediatek/clk-mtk.h |  2 +
  15  2 files changed, 48 insertions(+), 33 deletions(-)
  16
  17 --- a/drivers/clk/mediatek/clk-mtk.c
  18 +++ b/drivers/clk/mediatek/clk-mtk.c
  19 @@ -42,20 +42,14 @@
  20   * the accurate frequency.
  21   */
  22  static ulong mtk_clk_find_parent_rate(struct clk *clk, int id,
  23 -                                     const struct driver *drv)
  24 +                                     struct udevice *pdev)
  25  {
  26         struct clk parent = { .id = id, };
  27
  28 -       if (drv) {
  29 -               struct udevice *dev;
  30 -
  31 -               if (uclass_get_device_by_driver(UCLASS_CLK, drv, &dev))
  32 -                       return -ENODEV;
  33 -
  34 -               parent.dev = dev;
  35 -       } else {
  36 +       if (pdev)
  37 +               parent.dev = pdev;
  38 +       else
  39                 parent.dev = clk->dev;
  40 -       }
  41
  42         return clk_get_rate(&parent);
  43  }
  44 @@ -296,7 +290,7 @@ static ulong mtk_topckgen_get_factor_rat
  45         switch (fdiv->flags & CLK_PARENT_MASK) {
  46         case CLK_PARENT_APMIXED:
  47                 rate = mtk_clk_find_parent_rate(clk, fdiv->parent,
  48 -                               DM_DRIVER_GET(mtk_clk_apmixedsys));
  49 +                                               priv->parent);
  50                 break;
  51         case CLK_PARENT_TOPCKGEN:
  52                 rate = mtk_clk_find_parent_rate(clk, fdiv->parent, NULL);
  53 @@ -322,9 +316,18 @@ static ulong mtk_topckgen_get_mux_rate(s
  54
  55         if (mux->parent[index] == CLK_XTAL && priv->tree->flags & CLK_BYPASS_XTAL)
  56                 flag = 1;
  57 -       if (mux->parent[index] > 0 || flag == 1)
  58 -               return mtk_clk_find_parent_rate(clk, mux->parent[index],
  59 -                                               NULL);
  60 +       if (mux->parent[index] > 0 || flag == 1) {
  61 +               switch (mux->flags & CLK_PARENT_MASK) {
  62 +               case CLK_PARENT_APMIXED:
  63 +                       return mtk_clk_find_parent_rate(clk, mux->parent[index],
  64 +                                                       priv->parent);
  65 +                       break;
  66 +               default:
  67 +                       return mtk_clk_find_parent_rate(clk, mux->parent[index],
  68 +                                                       NULL);
  69 +                       break;
  70 +               }
  71 +       }
  72
  73         return priv->tree->xtal_rate;
  74  }
  75 @@ -343,7 +346,7 @@ static ulong mtk_topckgen_get_rate(struc
  76                                                  priv->tree->muxes_offs);
  77  }
  78
  79 -static int mtk_topckgen_enable(struct clk *clk)
  80 +static int mtk_clk_mux_enable(struct clk *clk)
  81  {
  82         struct mtk_clk_priv *priv = dev_get_priv(clk->dev);
  83         const struct mtk_composite *mux;
  84 @@ -376,7 +379,7 @@ static int mtk_topckgen_enable(struct cl
  85         return 0;
  86  }
  87
  88 -static int mtk_topckgen_disable(struct clk *clk)
  89 +static int mtk_clk_mux_disable(struct clk *clk)
  90  {
  91         struct mtk_clk_priv *priv = dev_get_priv(clk->dev);
  92         const struct mtk_composite *mux;
  93 @@ -402,7 +405,7 @@ static int mtk_topckgen_disable(struct c
  94         return 0;
  95  }
  96
  97 -static int mtk_topckgen_set_parent(struct clk *clk, struct clk *parent)
  98 +static int mtk_common_clk_set_parent(struct clk *clk, struct clk *parent)
  99  {
 100         struct mtk_clk_priv *priv = dev_get_priv(clk->dev);
 101
 102 @@ -474,19 +477,7 @@ static ulong mtk_clk_gate_get_rate(struc
 103         struct mtk_cg_priv *priv = dev_get_priv(clk->dev);
 104         const struct mtk_gate *gate = &priv->gates[clk->id];
 105
 106 -       switch (gate->flags & CLK_PARENT_MASK) {
 107 -       case CLK_PARENT_APMIXED:
 108 -               return mtk_clk_find_parent_rate(clk, gate->parent,
 109 -                               DM_DRIVER_GET(mtk_clk_apmixedsys));
 110 -               break;
 111 -       case CLK_PARENT_TOPCKGEN:
 112 -               return mtk_clk_find_parent_rate(clk, gate->parent,
 113 -                               DM_DRIVER_GET(mtk_clk_topckgen));
 114 -               break;
 115 -
 116 -       default:
 117 -               return priv->tree->xtal_rate;
 118 -       }
 119 +       return mtk_clk_find_parent_rate(clk, gate->parent, priv->parent);
 120  }
 121
 122  const struct clk_ops mtk_clk_apmixedsys_ops = {
 123 @@ -497,10 +488,10 @@ const struct clk_ops mtk_clk_apmixedsys_
 124  };
 125
 126  const struct clk_ops mtk_clk_topckgen_ops = {
 127 -       .enable = mtk_topckgen_enable,
 128 -       .disable = mtk_topckgen_disable,
 129 +       .enable = mtk_clk_mux_enable,
 130 +       .disable = mtk_clk_mux_disable,
 131         .get_rate = mtk_topckgen_get_rate,
 132 -       .set_parent = mtk_topckgen_set_parent,
 133 +       .set_parent = mtk_common_clk_set_parent,
 134  };
 135
 136  const struct clk_ops mtk_clk_gate_ops = {
 137 @@ -513,11 +504,22 @@ int mtk_common_clk_init(struct udevice *
 138                         const struct mtk_clk_tree *tree)
 139  {
 140         struct mtk_clk_priv *priv = dev_get_priv(dev);
 141 +       struct udevice *parent;
 142 +       int ret;
 143
 144         priv->base = dev_read_addr_ptr(dev);
 145         if (!priv->base)
 146                 return -ENOENT;
 147
 148 +       ret = uclass_get_device_by_phandle(UCLASS_CLK, dev, "clock-parent", &parent);
 149 +       if (ret || !parent) {
 150 +               ret = uclass_get_device_by_driver(UCLASS_CLK,
 151 +                               DM_DRIVER_GET(mtk_clk_apmixedsys), &parent);
 152 +               if (ret || !parent)
 153 +                       return -ENOENT;
 154 +       }
 155 +
 156 +       priv->parent = parent;
 157         priv->tree = tree;
 158
 159         return 0;
 160 @@ -528,11 +530,22 @@ int mtk_common_clk_gate_init(struct udev
 161                              const struct mtk_gate *gates)
 162  {
 163         struct mtk_cg_priv *priv = dev_get_priv(dev);
 164 +       struct udevice *parent;
 165 +       int ret;
 166
 167         priv->base = dev_read_addr_ptr(dev);
 168         if (!priv->base)
 169                 return -ENOENT;
 170
 171 +       ret = uclass_get_device_by_phandle(UCLASS_CLK, dev, "clock-parent", &parent);
 172 +       if (ret || !parent) {
 173 +               ret = uclass_get_device_by_driver(UCLASS_CLK,
 174 +                               DM_DRIVER_GET(mtk_clk_topckgen), &parent);
 175 +               if (ret || !parent)
 176 +                       return -ENOENT;
 177 +       }
 178 +
 179 +       priv->parent = parent;
 180         priv->tree = tree;
 181         priv->gates = gates;
 182
 183 --- a/drivers/clk/mediatek/clk-mtk.h
 184 +++ b/drivers/clk/mediatek/clk-mtk.h
 185 @@ -206,11 +206,13 @@ struct mtk_clk_tree {
 186  };
 187
 188  struct mtk_clk_priv {
 189 +       struct udevice *parent;
 190         void __iomem *base;
 191         const struct mtk_clk_tree *tree;
 192  };
 193
 194  struct mtk_cg_priv {
 195 +       struct udevice *parent;
 196         void __iomem *base;
 197         const struct mtk_clk_tree *tree;
 198         const struct mtk_gate *gates;