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

   1 From d3bc6269e21fc474763708e79c7a118740befb94 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
   3 Date: Tue, 26 Oct 2021 11:37:16 +0200
   4 Subject: [PATCH] phy: bcm-ns-usb2: support updated DT binding with PHY reg
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   9
  10 Updated DT binding maps just a PHY's register space instead of the whole
  11 DMU block. Accessing a common CRU reg is handled using syscon &
  12 regmap.
  13
  14 The old binding has been deprecated and remains supported as a fallback
  15 method.
  16
  17 Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
  18 Link: https://lore.kernel.org/r/20211026093716.5567-1-zajec5@gmail.com
  19 Signed-off-by: Vinod Koul <vkoul@kernel.org>
  20 ---
  21  drivers/phy/broadcom/phy-bcm-ns-usb2.c | 52 +++++++++++++++++++++-----
  22  1 file changed, 43 insertions(+), 9 deletions(-)
  23
  24 --- a/drivers/phy/broadcom/phy-bcm-ns-usb2.c
  25 +++ b/drivers/phy/broadcom/phy-bcm-ns-usb2.c
  26 @@ -9,17 +9,23 @@
  27  #include <linux/clk.h>
  28  #include <linux/delay.h>
  29  #include <linux/err.h>
  30 +#include <linux/mfd/syscon.h>
  31  #include <linux/module.h>
  32  #include <linux/of_address.h>
  33  #include <linux/of_platform.h>
  34  #include <linux/phy/phy.h>
  35  #include <linux/platform_device.h>
  36 +#include <linux/regmap.h>
  37  #include <linux/slab.h>
  38
  39  struct bcm_ns_usb2 {
  40         struct device *dev;
  41         struct clk *ref_clk;
  42         struct phy *phy;
  43 +       struct regmap *clkset;
  44 +       void __iomem *base;
  45 +
  46 +       /* Deprecated binding */
  47         void __iomem *dmu;
  48  };
  49
  50 @@ -27,7 +33,6 @@ static int bcm_ns_usb2_phy_init(struct p
  51  {
  52         struct bcm_ns_usb2 *usb2 = phy_get_drvdata(phy);
  53         struct device *dev = usb2->dev;
  54 -       void __iomem *dmu = usb2->dmu;
  55         u32 ref_clk_rate, usb2ctl, usb_pll_ndiv, usb_pll_pdiv;
  56         int err = 0;
  57
  58 @@ -44,7 +49,10 @@ static int bcm_ns_usb2_phy_init(struct p
  59                 goto err_clk_off;
  60         }
  61
  62 -       usb2ctl = readl(dmu + BCMA_DMU_CRU_USB2_CONTROL);
  63 +       if (usb2->base)
  64 +               usb2ctl = readl(usb2->base);
  65 +       else
  66 +               usb2ctl = readl(usb2->dmu + BCMA_DMU_CRU_USB2_CONTROL);
  67
  68         if (usb2ctl & BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_PDIV_MASK) {
  69                 usb_pll_pdiv = usb2ctl;
  70 @@ -58,15 +66,24 @@ static int bcm_ns_usb2_phy_init(struct p
  71         usb_pll_ndiv = (1920000000 * usb_pll_pdiv) / ref_clk_rate;
  72
  73         /* Unlock DMU PLL settings with some magic value */
  74 -       writel(0x0000ea68, dmu + BCMA_DMU_CRU_CLKSET_KEY);
  75 +       if (usb2->clkset)
  76 +               regmap_write(usb2->clkset, 0, 0x0000ea68);
  77 +       else
  78 +               writel(0x0000ea68, usb2->dmu + BCMA_DMU_CRU_CLKSET_KEY);
  79
  80         /* Write USB 2.0 PLL control setting */
  81         usb2ctl &= ~BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_NDIV_MASK;
  82         usb2ctl |= usb_pll_ndiv << BCMA_DMU_CRU_USB2_CONTROL_USB_PLL_NDIV_SHIFT;
  83 -       writel(usb2ctl, dmu + BCMA_DMU_CRU_USB2_CONTROL);
  84 +       if (usb2->base)
  85 +               writel(usb2ctl, usb2->base);
  86 +       else
  87 +               writel(usb2ctl, usb2->dmu + BCMA_DMU_CRU_USB2_CONTROL);
  88
  89         /* Lock DMU PLL settings */
  90 -       writel(0x00000000, dmu + BCMA_DMU_CRU_CLKSET_KEY);
  91 +       if (usb2->clkset)
  92 +               regmap_write(usb2->clkset, 0, 0x00000000);
  93 +       else
  94 +               writel(0x00000000, usb2->dmu + BCMA_DMU_CRU_CLKSET_KEY);
  95
  96  err_clk_off:
  97         clk_disable_unprepare(usb2->ref_clk);
  98 @@ -90,10 +107,27 @@ static int bcm_ns_usb2_probe(struct plat
  99                 return -ENOMEM;
 100         usb2->dev = dev;
 101
 102 -       usb2->dmu = devm_platform_ioremap_resource_byname(pdev, "dmu");
 103 -       if (IS_ERR(usb2->dmu)) {
 104 -               dev_err(dev, "Failed to map DMU regs\n");
 105 -               return PTR_ERR(usb2->dmu);
 106 +       if (of_find_property(dev->of_node, "brcm,syscon-clkset", NULL)) {
 107 +               usb2->base = devm_platform_ioremap_resource(pdev, 0);
 108 +               if (IS_ERR(usb2->base)) {
 109 +                       dev_err(dev, "Failed to map control reg\n");
 110 +                       return PTR_ERR(usb2->base);
 111 +               }
 112 +
 113 +               usb2->clkset = syscon_regmap_lookup_by_phandle(dev->of_node,
 114 +                                                              "brcm,syscon-clkset");
 115 +               if (IS_ERR(usb2->clkset)) {
 116 +                       dev_err(dev, "Failed to lookup clkset regmap\n");
 117 +                       return PTR_ERR(usb2->clkset);
 118 +               }
 119 +       } else {
 120 +               usb2->dmu = devm_platform_ioremap_resource_byname(pdev, "dmu");
 121 +               if (IS_ERR(usb2->dmu)) {
 122 +                       dev_err(dev, "Failed to map DMU regs\n");
 123 +                       return PTR_ERR(usb2->dmu);
 124 +               }
 125 +
 126 +               dev_warn(dev, "using deprecated DT binding\n");
 127         }
 128
 129         usb2->ref_clk = devm_clk_get(dev, "phy-ref-clk");