target/linux/mediatek/patches-4.4/0044-mfd-mt6397-add-support-for-different-Slave-types.patch

   1 From c6c447480e51301faa2254c7316ab075e20c4b0c Mon Sep 17 00:00:00 2001
   2 From: John Crispin <blogic@openwrt.org>
   3 Date: Fri, 8 Jan 2016 08:41:52 +0100
   4 Subject: [PATCH 044/102] mfd: mt6397: add support for different Slave types
   5
   6 Signed-off-by: John Crispin <blogic@openwrt.org>
   7 ---
   8  drivers/mfd/mt6397-core.c |   58 ++++++++++++++++++++++++++++++++-------------
   9  1 file changed, 41 insertions(+), 17 deletions(-)
  10
  11 --- a/drivers/mfd/mt6397-core.c
  12 +++ b/drivers/mfd/mt6397-core.c
  13 @@ -24,6 +24,9 @@
  14  #define MT6397_RTC_BASE                0xe000
  15  #define MT6397_RTC_SIZE                0x3e
  16
  17 +#define MT6391_CID_CODE                0x91
  18 +#define MT6397_CID_CODE                0x97
  19 +
  20  static const struct resource mt6397_rtc_resources[] = {
  21         {
  22                 .start = MT6397_RTC_BASE,
  23 @@ -232,39 +235,60 @@ static SIMPLE_DEV_PM_OPS(mt6397_pm_ops,
  24  static int mt6397_probe(struct platform_device *pdev)
  25  {
  26         int ret;
  27 -       struct mt6397_chip *mt6397;
  28 +       unsigned int id;
  29 +       struct mt6397_chip *pmic;
  30
  31 -       mt6397 = devm_kzalloc(&pdev->dev, sizeof(*mt6397), GFP_KERNEL);
  32 -       if (!mt6397)
  33 +       pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL);
  34 +       if (!pmic)
  35                 return -ENOMEM;
  36
  37 -       mt6397->dev = &pdev->dev;
  38 -       mt6397->int_con[0] = MT6397_INT_CON0;
  39 -       mt6397->int_con[1] = MT6397_INT_CON1;
  40 -       mt6397->int_status[0] = MT6397_INT_STATUS0;
  41 -       mt6397->int_status[1] = MT6397_INT_STATUS1;
  42 +       pmic->dev = &pdev->dev;
  43
  44         /*
  45          * mt6397 MFD is child device of soc pmic wrapper.
  46          * Regmap is set from its parent.
  47          */
  48 -       mt6397->regmap = dev_get_regmap(pdev->dev.parent, NULL);
  49 -       if (!mt6397->regmap)
  50 +       pmic->regmap = dev_get_regmap(pdev->dev.parent, NULL);
  51 +       if (!pmic->regmap)
  52                 return -ENODEV;
  53
  54 -       platform_set_drvdata(pdev, mt6397);
  55 +       platform_set_drvdata(pdev, pmic);
  56 +
  57 +       ret = regmap_read(pmic->regmap, MT6397_CID, &id);
  58 +       if (ret) {
  59 +               dev_err(pmic->dev, "Failed to read chip id: %d\n", ret);
  60 +               goto fail_irq;
  61 +       }
  62 +
  63 +       switch (id & 0xff) {
  64 +       case MT6397_CID_CODE:
  65 +       case MT6391_CID_CODE:
  66 +               pmic->int_con[0] = MT6397_INT_CON0;
  67 +               pmic->int_con[1] = MT6397_INT_CON1;
  68 +               pmic->int_status[0] = MT6397_INT_STATUS0;
  69 +               pmic->int_status[1] = MT6397_INT_STATUS1;
  70 +               ret = mfd_add_devices(&pdev->dev, -1, mt6397_devs,
  71 +                               ARRAY_SIZE(mt6397_devs), NULL, 0, NULL);
  72 +               break;
  73 +
  74 +       default:
  75 +               dev_err(&pdev->dev, "unsupported chip: %d\n", id);
  76 +               ret = -ENODEV;
  77 +               break;
  78 +       }
  79
  80 -       mt6397->irq = platform_get_irq(pdev, 0);
  81 -       if (mt6397->irq > 0) {
  82 -               ret = mt6397_irq_init(mt6397);
  83 +       pmic->irq = platform_get_irq(pdev, 0);
  84 +       if (pmic->irq > 0) {
  85 +               ret = mt6397_irq_init(pmic);
  86                 if (ret)
  87                         return ret;
  88         }
  89
  90 -       ret = mfd_add_devices(&pdev->dev, -1, mt6397_devs,
  91 -                       ARRAY_SIZE(mt6397_devs), NULL, 0, NULL);
  92 -       if (ret)
  93 +fail_irq:
  94 +       if (ret) {
  95 +               irq_domain_remove(pmic->irq_domain);
  96                 dev_err(&pdev->dev, "failed to add child devices: %d\n", ret);
  97 +       }
  98
  99         return ret;
 100  }