target/linux/mediatek/patches-4.14/0131-usb-xhci-mtk-add-optional-mcu-and-dma-bus-clocks.patch

   1 From 9dce908d64ffb8b0ab71cb3a4b79db398d2e6dc3 Mon Sep 17 00:00:00 2001
   2 From: Chunfeng Yun <chunfeng.yun@mediatek.com>
   3 Date: Fri, 13 Oct 2017 16:26:38 +0800
   4 Subject: [PATCH 131/224] usb: xhci-mtk: add optional mcu and dma bus clocks
   5
   6 There are mcu_bus and dma_bus clocks needed to be controlled by
   7 driver on some SoCs, so add them as optional ones
   8
   9 Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
  10 Acked-by: Mathias Nyman <mathias.nyman@linux.intel.com>
  11 Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
  12 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  13 ---
  14  drivers/usb/host/xhci-mtk.c | 79 ++++++++++++++++++++++++++++++++++-----------
  15  drivers/usb/host/xhci-mtk.h |  2 ++
  16  2 files changed, 62 insertions(+), 19 deletions(-)
  17
  18 --- a/drivers/usb/host/xhci-mtk.c
  19 +++ b/drivers/usb/host/xhci-mtk.c
  20 @@ -221,6 +221,44 @@ static int xhci_mtk_ssusb_config(struct
  21         return xhci_mtk_host_enable(mtk);
  22  }
  23
  24 +/* ignore the error if the clock does not exist */
  25 +static struct clk *optional_clk_get(struct device *dev, const char *id)
  26 +{
  27 +       struct clk *opt_clk;
  28 +
  29 +       opt_clk = devm_clk_get(dev, id);
  30 +       /* ignore error number except EPROBE_DEFER */
  31 +       if (IS_ERR(opt_clk) && (PTR_ERR(opt_clk) != -EPROBE_DEFER))
  32 +               opt_clk = NULL;
  33 +
  34 +       return opt_clk;
  35 +}
  36 +
  37 +static int xhci_mtk_clks_get(struct xhci_hcd_mtk *mtk)
  38 +{
  39 +       struct device *dev = mtk->dev;
  40 +
  41 +       mtk->sys_clk = devm_clk_get(dev, "sys_ck");
  42 +       if (IS_ERR(mtk->sys_clk)) {
  43 +               dev_err(dev, "fail to get sys_ck\n");
  44 +               return PTR_ERR(mtk->sys_clk);
  45 +       }
  46 +
  47 +       mtk->ref_clk = optional_clk_get(dev, "ref_ck");
  48 +       if (IS_ERR(mtk->ref_clk))
  49 +               return PTR_ERR(mtk->ref_clk);
  50 +
  51 +       mtk->mcu_clk = optional_clk_get(dev, "mcu_ck");
  52 +       if (IS_ERR(mtk->mcu_clk))
  53 +               return PTR_ERR(mtk->mcu_clk);
  54 +
  55 +       mtk->dma_clk = optional_clk_get(dev, "dma_ck");
  56 +       if (IS_ERR(mtk->dma_clk))
  57 +               return PTR_ERR(mtk->dma_clk);
  58 +
  59 +       return 0;
  60 +}
  61 +
  62  static int xhci_mtk_clks_enable(struct xhci_hcd_mtk *mtk)
  63  {
  64         int ret;
  65 @@ -237,16 +275,34 @@ static int xhci_mtk_clks_enable(struct x
  66                 goto sys_clk_err;
  67         }
  68
  69 +       ret = clk_prepare_enable(mtk->mcu_clk);
  70 +       if (ret) {
  71 +               dev_err(mtk->dev, "failed to enable mcu_clk\n");
  72 +               goto mcu_clk_err;
  73 +       }
  74 +
  75 +       ret = clk_prepare_enable(mtk->dma_clk);
  76 +       if (ret) {
  77 +               dev_err(mtk->dev, "failed to enable dma_clk\n");
  78 +               goto dma_clk_err;
  79 +       }
  80 +
  81         return 0;
  82
  83 +dma_clk_err:
  84 +       clk_disable_unprepare(mtk->mcu_clk);
  85 +mcu_clk_err:
  86 +       clk_disable_unprepare(mtk->sys_clk);
  87  sys_clk_err:
  88         clk_disable_unprepare(mtk->ref_clk);
  89  ref_clk_err:
  90 -       return -EINVAL;
  91 +       return ret;
  92  }
  93
  94  static void xhci_mtk_clks_disable(struct xhci_hcd_mtk *mtk)
  95  {
  96 +       clk_disable_unprepare(mtk->dma_clk);
  97 +       clk_disable_unprepare(mtk->mcu_clk);
  98         clk_disable_unprepare(mtk->sys_clk);
  99         clk_disable_unprepare(mtk->ref_clk);
 100  }
 101 @@ -529,24 +585,9 @@ static int xhci_mtk_probe(struct platfor
 102                 return PTR_ERR(mtk->vusb33);
 103         }
 104
 105 -       mtk->sys_clk = devm_clk_get(dev, "sys_ck");
 106 -       if (IS_ERR(mtk->sys_clk)) {
 107 -               dev_err(dev, "fail to get sys_ck\n");
 108 -               return PTR_ERR(mtk->sys_clk);
 109 -       }
 110 -
 111 -       /*
 112 -        * reference clock is usually a "fixed-clock", make it optional
 113 -        * for backward compatibility and ignore the error if it does
 114 -        * not exist.
 115 -        */
 116 -       mtk->ref_clk = devm_clk_get(dev, "ref_ck");
 117 -       if (IS_ERR(mtk->ref_clk)) {
 118 -               if (PTR_ERR(mtk->ref_clk) == -EPROBE_DEFER)
 119 -                       return -EPROBE_DEFER;
 120 -
 121 -               mtk->ref_clk = NULL;
 122 -       }
 123 +       ret = xhci_mtk_clks_get(mtk);
 124 +       if (ret)
 125 +               return ret;
 126
 127         mtk->lpm_support = of_property_read_bool(node, "usb3-lpm-capable");
 128         /* optional property, ignore the error if it does not exist */
 129 --- a/drivers/usb/host/xhci-mtk.h
 130 +++ b/drivers/usb/host/xhci-mtk.h
 131 @@ -126,6 +126,8 @@ struct xhci_hcd_mtk {
 132         struct regulator *vbus;
 133         struct clk *sys_clk;    /* sys and mac clock */
 134         struct clk *ref_clk;
 135 +       struct clk *mcu_clk;
 136 +       struct clk *dma_clk;
 137         struct regmap *pericfg;
 138         struct phy **phys;
 139         int num_phys;