On Thursday, September 20, 2012, Thomas Abraham <thomas.abra...@linaro.org> 
wrote:
> On 19 September 2012 19:09, Seungwon Jeon <tgih....@samsung.com> wrote:
> > On Tuesday, September 18, 2012, Thomas Abraham <thomas.abra...@linaro.org> 
> > wrote:
> >> +#ifdef CONFIG_OF
> >> +/* given a slot id, find out the device node representing that slot */
> >> +static struct device_node *dw_mci_of_find_slot_node(struct device *dev, 
> >> u8 slot)
> >> +{
> >> +     struct device_node *np;
> >> +     const __be32 *addr;
> >> +     int len;
> >> +
> >> +     if (!dev || !dev->of_node)
> >> +             return NULL;
> >> +
> >> +     for_each_child_of_node(dev->of_node, np) {
> >> +             addr = of_get_property(np, "reg", &len);
> >> +             if (!addr || (len < sizeof(int)))
> >> +                     continue;
> >> +             if (be32_to_cpup(addr) == slot)
> >> +                     return np;
> >> +     }
> >> +     return NULL;
> >> +}
> >> +
> >> +/* find out bus-width for a given slot */
> >> +static u32 dw_mci_of_get_bus_wd(struct device *dev, u8 slot)
> >> +{
> >> +     struct device_node *np = dw_mci_of_find_slot_node(dev, slot);
> >> +     u32 bus_wd = 1;
> >> +
> >> +     if (!np)
> >> +             return 1;
> >> +
> >> +     if (of_property_read_u32(np, "bus-width", &bus_wd))
> >> +             dev_err(dev, "bus-width property not found, assuming width"
> >> +                            " as 1\n");
> >> +     return bus_wd;
> >> +}
> >> +#else /* CONFIG_OF */
> >> +static u32 dw_mci_of_get_bus_wd(struct device *dev, u8 slot)
> >> +{
> >> +     return 1;
> >> +}
> >> +static struct device_node *dw_mci_of_find_slot_node(struct device *dev, 
> >> u8 slot)
> >> +{
> >> +     return NULL;
> >> +}
> >> +#endif /* CONFIG_OF */
> >> +
> >>  static int dw_mci_init_slot(struct dw_mci *host, unsigned int id)
> >>  {
> >>       struct mmc_host *mmc;
> >>       struct dw_mci_slot *slot;
> >> +     u8 bus_width;
> >>
> >>       mmc = mmc_alloc_host(sizeof(struct dw_mci_slot), host->dev);
> >>       if (!mmc)
> >> @@ -1782,6 +1830,7 @@ static int dw_mci_init_slot(struct dw_mci *host, 
> >> unsigned int id)
> >>       slot->id = id;
> >>       slot->mmc = mmc;
> >>       slot->host = host;
> >> +     host->slot[id] = slot;
> >>
> >>       mmc->ops = &dw_mci_ops;
> >>       mmc->f_min = DIV_ROUND_UP(host->bus_hz, 510);
> >> @@ -1806,8 +1855,18 @@ static int dw_mci_init_slot(struct dw_mci *host, 
> >> unsigned int id)
> >>               mmc->caps2 = host->pdata->caps2;
> >>
> >>       if (host->pdata->get_bus_wd)
> >> -             if (host->pdata->get_bus_wd(slot->id) >= 4)
> >> -                     mmc->caps |= MMC_CAP_4_BIT_DATA;
> >> +             bus_width = host->pdata->get_bus_wd(slot->id);
> >> +     else if (host->dev->of_node)
> >> +             bus_width = dw_mci_of_get_bus_wd(host->dev, slot->id);
> >> +     else
> >> +             bus_width = 1;
> >> +
> >> +     switch (bus_width) {
> >> +     case 8:
> >> +             mmc->caps |= MMC_CAP_8_BIT_DATA;
> >> +     case 4:
> >> +             mmc->caps |= MMC_CAP_4_BIT_DATA;
> >> +     }
> >>
> >>       if (host->pdata->quirks & DW_MCI_QUIRK_HIGHSPEED)
> >>               mmc->caps |= MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED;
> >> @@ -1852,7 +1911,6 @@ static int dw_mci_init_slot(struct dw_mci *host, 
> >> unsigned int id)
> >>       else
> >>               clear_bit(DW_MMC_CARD_PRESENT, &slot->flags);
> >>
> >> -     host->slot[id] = slot;
> >>       mmc_add_host(mmc);
> >>
> >>  #if defined(CONFIG_DEBUG_FS)
> >> @@ -1944,16 +2002,74 @@ static bool mci_wait_reset(struct device *dev, 
> >> struct dw_mci *host)
> >>       return false;
> >>  }
> >>
> > The following CONFIG_OF block can be put together in upper CONFIG_OF .
> 
> The placement of device tree related code is considering the logical
> structure and flow of the code. So maybe we can just retain the below
> code here for now.
> 
> >
> >> +#ifdef CONFIG_OF
> >> +static struct dw_mci_of_quirks {
> >> +     char *quirk;
> >> +     int id;
> >> +} of_quirks[] = {
> >> +     {
> >> +             .quirk  = "supports-highspeed",
> >> +             .id     = DW_MCI_QUIRK_HIGHSPEED,
> >> +     }, {
> >> +             .quirk  = "broken-cd",
> >> +             .id     = DW_MCI_QUIRK_BROKEN_CARD_DETECTION,
> >> +     },
> >> +};
> >> +
> >> +static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
> >> +{
> >> +     struct dw_mci_board *pdata;
> >> +     struct device *dev = host->dev;
> >> +     struct device_node *np = dev->of_node;
> >> +     int idx;
> >> +
> >> +     pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
> >> +     if (!pdata) {
> >> +             dev_err(dev, "could not allocate memory for pdata\n");
> >> +             return ERR_PTR(-ENOMEM);
> >> +     }
> >> +
> >> +     /* find out number of slots supported */
> >> +     if (of_property_read_u32(dev->of_node, "num-slots",
> >> +                             &pdata->num_slots)) {
> >> +             dev_info(dev, "num-slots property not found, "
> >> +                             "assuming 1 slot is available\n");
> >> +             pdata->num_slots = 1;
> >> +     }
> >> +
> >> +     /* get quirks */
> >> +     for (idx = 0; idx < ARRAY_SIZE(of_quirks); idx++)
> >> +             if (of_get_property(np, of_quirks[idx].quirk, NULL))
> >> +                     pdata->quirks |= of_quirks[idx].id;
> >> +
> >> +     if (of_property_read_u32(np, "fifo-depth", &pdata->fifo_depth))
> >> +             dev_info(dev, "fifo-depth property not found, using "
> >> +                             "value of FIFOTH register as default\n");
> >> +
> >> +     of_property_read_u32(np, "card-detect-delay", 
> >> &pdata->detect_delay_ms);
> >> +
> >> +     return pdata;
> >> +}
> >> +
> >> +#else /* CONFIG_OF */
> >> +static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host)
> >> +{
> >> +     return ERR_PTR(-EINVAL);
> >> +}
> >> +#endif /* CONFIG_OF */
> >> +
> >>  int dw_mci_probe(struct dw_mci *host)
> >>  {
> >>       int width, i, ret = 0;
> >>       u32 fifo_size;
> >>       int init_slots = 0;
> >>
> >> -     if (!host->pdata || !host->pdata->init) {
> > "!host->pdata->init" is removed.
> > Please check it.
> 
> I have checked again in mmc-next branch and "init" is still there.
I mean that there is no condition whether "host->pdata->init" is present or 
not, unlike origin code.
In this patch this condition is removed. We don't need it anymore?

> 
> Thanks,
> Thomas.
> 
> 
> >
> > Thanks,
> > Seungwon Jeon
> >
> >> -             dev_err(host->dev,
> >> -                     "Platform data must supply init function\n");
> >> -             return -ENODEV;
> >> +     if (!host->pdata) {
> >> +             host->pdata = dw_mci_parse_dt(host);
> >> +             if (IS_ERR(host->pdata)) {
> >> +                     dev_err(host->dev, "platform data not available\n");
> >> +                     return -EINVAL;
> >> +             }
> >>       }
> >>
> >>       if (!host->pdata->select_slot && host->pdata->num_slots > 1) {
> >> --
> >> 1.6.6.rc2
> >>
> >> --
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> >
> 
> [...]
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