target/linux/sunxi/patches-4.4/144-usb-ehci-plat-support-multiple-reset-ctrllines.patch

   1 From 957e8f96c67052ca843ea9ffc5223662b973e5de Mon Sep 17 00:00:00 2001
   2 From: Reinder de Haan <patchesrdh@mveas.com>
   3 Date: Sun, 15 Nov 2015 14:24:46 +0100
   4 Subject: [PATCH] ehci-platform: Add support for controllers with multiple
   5  reset lines
   6
   7 At least the EHCI/OHCI found on the Allwinnner H3 SoC needs multiple
   8 reset lines, the controller will not initialize while the reset for
   9 its companion is still asserted, which means we need to de-assert
  10 2 resets for the controller to work.
  11
  12 Signed-off-by: Reinder de Haan <patchesrdh@mveas.com>
  13 Signed-off-by: Hans de Goede <hdegoede@redhat.com>
  14 ---
  15 Changes in v2:
  16 -Use the new reset_control_[de]assert_shared reset-controller functions
  17 ---
  18  Documentation/devicetree/bindings/usb/usb-ehci.txt |  2 +-
  19  drivers/usb/host/ehci-platform.c                   | 47 +++++++++++++---------
  20  2 files changed, 30 insertions(+), 19 deletions(-)
  21
  22 --- a/Documentation/devicetree/bindings/usb/usb-ehci.txt
  23 +++ b/Documentation/devicetree/bindings/usb/usb-ehci.txt
  24 @@ -18,7 +18,7 @@ Optional properties:
  25   - clocks : a list of phandle + clock specifier pairs
  26   - phys : phandle + phy specifier pair
  27   - phy-names : "usb"
  28 - - resets : phandle + reset specifier pair
  29 + - resets : a list of phandle + reset specifier pairs
  30
  31  Example (Sequoia 440EPx):
  32      ehci@e0000300 {
  33 --- a/drivers/usb/host/ehci-platform.c
  34 +++ b/drivers/usb/host/ehci-platform.c
  35 @@ -39,11 +39,12 @@
  36
  37  #define DRIVER_DESC "EHCI generic platform driver"
  38  #define EHCI_MAX_CLKS 3
  39 +#define EHCI_MAX_RESETS 2
  40  #define hcd_to_ehci_priv(h) ((struct ehci_platform_priv *)hcd_to_ehci(h)->priv)
  41
  42  struct ehci_platform_priv {
  43         struct clk *clks[EHCI_MAX_CLKS];
  44 -       struct reset_control *rst;
  45 +       struct reset_control *resets[EHCI_MAX_RESETS];
  46         struct phy **phys;
  47         int num_phys;
  48         bool reset_on_resume;
  49 @@ -149,7 +150,7 @@ static int ehci_platform_probe(struct pl
  50         struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
  51         struct ehci_platform_priv *priv;
  52         struct ehci_hcd *ehci;
  53 -       int err, irq, phy_num, clk = 0;
  54 +       int err, irq, phy_num, clk = 0, rst = 0;
  55
  56         if (usb_disabled())
  57                 return -ENODEV;
  58 @@ -232,18 +233,24 @@ static int ehci_platform_probe(struct pl
  59                                 break;
  60                         }
  61                 }
  62 -       }
  63
  64 -       priv->rst = devm_reset_control_get_optional(&dev->dev, NULL);
  65 -       if (IS_ERR(priv->rst)) {
  66 -               err = PTR_ERR(priv->rst);
  67 -               if (err == -EPROBE_DEFER)
  68 -                       goto err_put_clks;
  69 -               priv->rst = NULL;
  70 -       } else {
  71 -               err = reset_control_deassert(priv->rst);
  72 -               if (err)
  73 -                       goto err_put_clks;
  74 +               for (rst = 0; rst < EHCI_MAX_RESETS; rst++) {
  75 +                       priv->resets[rst] =
  76 +                               of_reset_control_get_by_index(dev->dev.of_node,
  77 +                                                             rst);
  78 +                       if (IS_ERR(priv->resets[rst])) {
  79 +                               err = PTR_ERR(priv->resets[rst]);
  80 +                               if (err == -EPROBE_DEFER)
  81 +                                       goto err_reset;
  82 +                               priv->resets[rst] = NULL;
  83 +                               break;
  84 +                       }
  85 +                       err = reset_control_deassert_shared(priv->resets[rst]);
  86 +                       if (err) {
  87 +                               reset_control_put(priv->resets[rst]);
  88 +                               goto err_reset;
  89 +                       }
  90 +               }
  91         }
  92
  93         if (pdata->big_endian_desc)
  94 @@ -302,8 +309,10 @@ err_power:
  95         if (pdata->power_off)
  96                 pdata->power_off(dev);
  97  err_reset:
  98 -       if (priv->rst)
  99 -               reset_control_assert(priv->rst);
 100 +       while (--rst >= 0) {
 101 +               reset_control_assert_shared(priv->resets[rst]);
 102 +               reset_control_put(priv->resets[rst]);
 103 +       }
 104  err_put_clks:
 105         while (--clk >= 0)
 106                 clk_put(priv->clks[clk]);
 107 @@ -321,15 +330,17 @@ static int ehci_platform_remove(struct p
 108         struct usb_hcd *hcd = platform_get_drvdata(dev);
 109         struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
 110         struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
 111 -       int clk;
 112 +       int clk, rst;
 113
 114         usb_remove_hcd(hcd);
 115
 116         if (pdata->power_off)
 117                 pdata->power_off(dev);
 118
 119 -       if (priv->rst)
 120 -               reset_control_assert(priv->rst);
 121 +       for (rst = 0; rst < EHCI_MAX_RESETS && priv->resets[rst]; rst++) {
 122 +               reset_control_assert_shared(priv->resets[rst]);
 123 +               reset_control_put(priv->resets[rst]);
 124 +       }
 125
 126         for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++)
 127                 clk_put(priv->clks[clk]);