target/linux/bcm53xx/patches-5.10/083-v6.0-clk-iproc-Do-not-rely-on-node-name-for-correct-PLL-s.patch

   1 From 1b24a132eba7a1c19475ba2510ec1c00af3ff914 Mon Sep 17 00:00:00 2001
   2 From: Florian Fainelli <f.fainelli@gmail.com>
   3 Date: Mon, 5 Sep 2022 09:15:03 -0700
   4 Subject: [PATCH] clk: iproc: Do not rely on node name for correct PLL setup
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 After commit 31fd9b79dc58 ("ARM: dts: BCM5301X: update CRU block
  10 description") a warning from clk-iproc-pll.c was generated due to a
  11 duplicate PLL name as well as the console stopped working. Upon closer
  12 inspection it became clear that iproc_pll_clk_setup() used the Device
  13 Tree node unit name as an unique identifier as well as a parent name to
  14 parent all clocks under the PLL.
  15
  16 BCM5301X was the first platform on which that got noticed because of the
  17 DT node unit name renaming but the same assumptions hold true for any
  18 user of the iproc_pll_clk_setup() function.
  19
  20 The first 'clock-output-names' property is always guaranteed to be
  21 unique as well as providing the actual desired PLL clock name, so we
  22 utilize that to register the PLL and as a parent name of all children
  23 clock.
  24
  25 Fixes: 5fe225c105fd ("clk: iproc: add initial common clock support")
  26 Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
  27 Acked-by: Rafał Miłecki <rafal@milecki.pl>
  28 Link: https://lore.kernel.org/r/20220905161504.1526-1-f.fainelli@gmail.com
  29 Signed-off-by: Stephen Boyd <sboyd@kernel.org>
  30 ---
  31  drivers/clk/bcm/clk-iproc-pll.c | 12 ++++++++----
  32  1 file changed, 8 insertions(+), 4 deletions(-)
  33
  34 --- a/drivers/clk/bcm/clk-iproc-pll.c
  35 +++ b/drivers/clk/bcm/clk-iproc-pll.c
  36 @@ -736,6 +736,7 @@ void iproc_pll_clk_setup(struct device_n
  37         const char *parent_name;
  38         struct iproc_clk *iclk_array;
  39         struct clk_hw_onecell_data *clk_data;
  40 +       const char *clk_name;
  41
  42         if (WARN_ON(!pll_ctrl) || WARN_ON(!clk_ctrl))
  43                 return;
  44 @@ -783,7 +784,12 @@ void iproc_pll_clk_setup(struct device_n
  45         iclk = &iclk_array[0];
  46         iclk->pll = pll;
  47
  48 -       init.name = node->name;
  49 +       ret = of_property_read_string_index(node, "clock-output-names",
  50 +                                           0, &clk_name);
  51 +       if (WARN_ON(ret))
  52 +               goto err_pll_register;
  53 +
  54 +       init.name = clk_name;
  55         init.ops = &iproc_pll_ops;
  56         init.flags = 0;
  57         parent_name = of_clk_get_parent_name(node, 0);
  58 @@ -803,13 +809,11 @@ void iproc_pll_clk_setup(struct device_n
  59                 goto err_pll_register;
  60
  61         clk_data->hws[0] = &iclk->hw;
  62 +       parent_name = clk_name;
  63
  64         /* now initialize and register all leaf clocks */
  65         for (i = 1; i < num_clks; i++) {
  66 -               const char *clk_name;
  67 -
  68                 memset(&init, 0, sizeof(init));
  69 -               parent_name = node->name;
  70
  71                 ret = of_property_read_string_index(node, "clock-output-names",
  72                                                     i, &clk_name);