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   1 From: Florian Fainelli <f.fainelli@gmail.com>
   2 Subject: [PATCH v3 7/9] mtd: rawnand: brcmnand: Allow platform data instantation
   3 Date: Fri, 07 Jan 2022 10:46:12 -0800
   4 Content-Type: text/plain; charset="utf-8"
   5
   6 Make use of the recently refactored code in brcmnand_init_cs() and
   7 derive the chip-select from the platform data that is supplied. Update
   8 the various code paths to avoid relying on possibly non-existent
   9 resources, too.
  10
  11 Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
  12 ---
  13  drivers/mtd/nand/raw/brcmnand/brcmnand.c | 45 ++++++++++++++++++------
  14  1 file changed, 35 insertions(+), 10 deletions(-)
  15
  16 --- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
  17 +++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
  18 @@ -9,6 +9,7 @@
  19  #include <linux/delay.h>
  20  #include <linux/device.h>
  21  #include <linux/platform_device.h>
  22 +#include <linux/platform_data/brcmnand.h>
  23  #include <linux/err.h>
  24  #include <linux/completion.h>
  25  #include <linux/interrupt.h>
  26 @@ -2811,7 +2812,8 @@ static const struct nand_controller_ops
  27         .attach_chip = brcmnand_attach_chip,
  28  };
  29
  30 -static int brcmnand_init_cs(struct brcmnand_host *host)
  31 +static int brcmnand_init_cs(struct brcmnand_host *host,
  32 +                           const char * const *part_probe_types)
  33  {
  34         struct brcmnand_controller *ctrl = host->ctrl;
  35         struct device *dev = ctrl->dev;
  36 @@ -2864,7 +2866,7 @@ static int brcmnand_init_cs(struct brcmn
  37         if (ret)
  38                 return ret;
  39
  40 -       ret = mtd_device_register(mtd, NULL, 0);
  41 +       ret = mtd_device_parse_register(mtd, part_probe_types, NULL, NULL, 0);
  42         if (ret)
  43                 nand_cleanup(chip);
  44
  45 @@ -3033,17 +3035,15 @@ static int brcmnand_edu_setup(struct pla
  46
  47  int brcmnand_probe(struct platform_device *pdev, struct brcmnand_soc *soc)
  48  {
  49 +       struct brcmnand_platform_data *pd = dev_get_platdata(&pdev->dev);
  50         struct device *dev = &pdev->dev;
  51         struct device_node *dn = dev->of_node, *child;
  52         struct brcmnand_controller *ctrl;
  53 +       struct brcmnand_host *host;
  54         struct resource *res;
  55         int ret;
  56
  57 -       /* We only support device-tree instantiation */
  58 -       if (!dn)
  59 -               return -ENODEV;
  60 -
  61 -       if (!of_match_node(brcmnand_of_match, dn))
  62 +       if (dn && !of_match_node(brcmnand_of_match, dn))
  63                 return -ENODEV;
  64
  65         ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL);
  66 @@ -3070,7 +3070,7 @@ int brcmnand_probe(struct platform_devic
  67         /* NAND register range */
  68         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  69         ctrl->nand_base = devm_ioremap_resource(dev, res);
  70 -       if (IS_ERR(ctrl->nand_base))
  71 +       if (IS_ERR(ctrl->nand_base) && !brcmnand_soc_has_ops(soc))
  72                 return PTR_ERR(ctrl->nand_base);
  73
  74         /* Enable clock before using NAND registers */
  75 @@ -3214,7 +3214,6 @@ int brcmnand_probe(struct platform_devic
  76
  77         for_each_available_child_of_node(dn, child) {
  78                 if (of_device_is_compatible(child, "brcm,nandcs")) {
  79 -                       struct brcmnand_host *host;
  80
  81                         host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
  82                         if (!host) {
  83 @@ -3234,7 +3233,7 @@ int brcmnand_probe(struct platform_devic
  84
  85                         nand_set_flash_node(&host->chip, child);
  86
  87 -                       ret = brcmnand_init_cs(host);
  88 +                       ret = brcmnand_init_cs(host, NULL);
  89                         if (ret) {
  90                                 devm_kfree(dev, host);
  91                                 continue; /* Try all chip-selects */
  92 @@ -3244,6 +3243,32 @@ int brcmnand_probe(struct platform_devic
  93                 }
  94         }
  95
  96 +       if (!list_empty(&ctrl->host_list))
  97 +               return 0;
  98 +
  99 +       if (!pd) {
 100 +               ret = -ENODEV;
 101 +               goto err;
 102 +       }
 103 +
 104 +       /* If we got there we must have been probing via platform data */
 105 +       host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
 106 +       if (!host) {
 107 +               ret = -ENOMEM;
 108 +               goto err;
 109 +       }
 110 +       host->pdev = pdev;
 111 +       host->ctrl = ctrl;
 112 +       host->cs = pd->chip_select;
 113 +       host->chip.ecc.size = pd->ecc_stepsize;
 114 +       host->chip.ecc.strength = pd->ecc_strength;
 115 +
 116 +       ret = brcmnand_init_cs(host, pd->part_probe_types);
 117 +       if (ret)
 118 +               goto err;
 119 +
 120 +       list_add_tail(&host->node, &ctrl->host_list);
 121 +
 122         /* No chip-selects could initialize properly */
 123         if (list_empty(&ctrl->host_list)) {
 124                 ret = -ENODEV;