target/linux/sunxi/patches-4.4/145-usb-ohci-plat-support-multiple-reset-ctrllines.patch

   1 From 5f0c864c1f207dba1db587747a58ec6b362dadf8 Mon Sep 17 00:00:00 2001
   2 From: Hans de Goede <hdegoede@redhat.com>
   3 Date: Sun, 29 Nov 2015 18:44:14 +0100
   4 Subject: [PATCH] ohci-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: Hans de Goede <hdegoede@redhat.com>
  13 ---
  14 Changes in v2:
  15 -New patch in v2 of this patch-set, to complement the identical patch for
  16  the ehci-platform code
  17 ---
  18  Documentation/devicetree/bindings/usb/usb-ohci.txt |  2 +-
  19  drivers/usb/host/ohci-platform.c                   | 49 +++++++++++++---------
  20  2 files changed, 30 insertions(+), 21 deletions(-)
  21
  22 diff --git a/Documentation/devicetree/bindings/usb/usb-ohci.txt b/Documentation/devicetree/bindings/usb/usb-ohci.txt
  23 index 19233b7..9df4569 100644
  24 --- a/Documentation/devicetree/bindings/usb/usb-ohci.txt
  25 +++ b/Documentation/devicetree/bindings/usb/usb-ohci.txt
  26 @@ -14,7 +14,7 @@ Optional properties:
  27  - clocks : a list of phandle + clock specifier pairs
  28  - phys : phandle + phy specifier pair
  29  - phy-names : "usb"
  30 -- resets : phandle + reset specifier pair
  31 +- resets : a list of phandle + reset specifier pairs
  32
  33  Example:
  34
  35 diff --git a/drivers/usb/host/ohci-platform.c b/drivers/usb/host/ohci-platform.c
  36 index c2669f18..7d8bbc4 100644
  37 --- a/drivers/usb/host/ohci-platform.c
  38 +++ b/drivers/usb/host/ohci-platform.c
  39 @@ -33,11 +33,12 @@
  40
  41  #define DRIVER_DESC "OHCI generic platform driver"
  42  #define OHCI_MAX_CLKS 3
  43 +#define OHCI_MAX_RESETS 2
  44  #define hcd_to_ohci_priv(h) ((struct ohci_platform_priv *)hcd_to_ohci(h)->priv)
  45
  46  struct ohci_platform_priv {
  47         struct clk *clks[OHCI_MAX_CLKS];
  48 -       struct reset_control *rst;
  49 +       struct reset_control *resets[OHCI_MAX_RESETS];
  50         struct phy **phys;
  51         int num_phys;
  52  };
  53 @@ -117,7 +118,7 @@ static int ohci_platform_probe(struct platform_device *dev)
  54         struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
  55         struct ohci_platform_priv *priv;
  56         struct ohci_hcd *ohci;
  57 -       int err, irq, phy_num, clk = 0;
  58 +       int err, irq, phy_num, clk = 0, rst = 0;
  59
  60         if (usb_disabled())
  61                 return -ENODEV;
  62 @@ -195,19 +196,23 @@ static int ohci_platform_probe(struct platform_device *dev)
  63                                 break;
  64                         }
  65                 }
  66 -
  67 -       }
  68 -
  69 -       priv->rst = devm_reset_control_get_optional(&dev->dev, NULL);
  70 -       if (IS_ERR(priv->rst)) {
  71 -               err = PTR_ERR(priv->rst);
  72 -               if (err == -EPROBE_DEFER)
  73 -                       goto err_put_clks;
  74 -               priv->rst = NULL;
  75 -       } else {
  76 -               err = reset_control_deassert(priv->rst);
  77 -               if (err)
  78 -                       goto err_put_clks;
  79 +               for (rst = 0; rst < OHCI_MAX_RESETS; rst++) {
  80 +                       priv->resets[rst] =
  81 +                               of_reset_control_get_by_index(dev->dev.of_node,
  82 +                                                             rst);
  83 +                       if (IS_ERR(priv->resets[rst])) {
  84 +                               err = PTR_ERR(priv->resets[rst]);
  85 +                               if (err == -EPROBE_DEFER)
  86 +                                       goto err_reset;
  87 +                               priv->resets[rst] = NULL;
  88 +                               break;
  89 +                       }
  90 +                       err = reset_control_deassert_shared(priv->resets[rst]);
  91 +                       if (err) {
  92 +                               reset_control_put(priv->resets[rst]);
  93 +                               goto err_reset;
  94 +                       }
  95 +               }
  96         }
  97
  98         if (pdata->big_endian_desc)
  99 @@ -265,8 +270,10 @@ static int ohci_platform_probe(struct platform_device *dev)
 100         if (pdata->power_off)
 101                 pdata->power_off(dev);
 102  err_reset:
 103 -       if (priv->rst)
 104 -               reset_control_assert(priv->rst);
 105 +       while (--rst >= 0) {
 106 +               reset_control_assert_shared(priv->resets[rst]);
 107 +               reset_control_put(priv->resets[rst]);
 108 +       }
 109  err_put_clks:
 110         while (--clk >= 0)
 111                 clk_put(priv->clks[clk]);
 112 @@ -284,15 +291,17 @@ static int ohci_platform_remove(struct platform_device *dev)
 113         struct usb_hcd *hcd = platform_get_drvdata(dev);
 114         struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
 115         struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
 116 -       int clk;
 117 +       int clk, rst;
 118
 119         usb_remove_hcd(hcd);
 120
 121         if (pdata->power_off)
 122                 pdata->power_off(dev);
 123
 124 -       if (priv->rst)
 125 -               reset_control_assert(priv->rst);
 126 +       for (rst = 0; rst < OHCI_MAX_RESETS && priv->resets[rst]; rst++) {
 127 +               reset_control_assert_shared(priv->resets[rst]);
 128 +               reset_control_put(priv->resets[rst]);
 129 +       }
 130
 131         for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++)
 132                 clk_put(priv->clks[clk]);