target/linux/generic/backport-5.10/790-v5.13-0006-net-dsa-b53-mmap-Add-device-tree-support.patch

   1 From a5538a777b73b35750ed1ffff8c1ef539e861624 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= <noltari@gmail.com>
   3 Date: Wed, 17 Mar 2021 10:23:17 +0100
   4 Subject: [PATCH] net: dsa: b53: mmap: Add device tree support
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 Add device tree support to b53_mmap.c while keeping platform devices support.
  10
  11 Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
  12 Signed-off-by: David S. Miller <davem@davemloft.net>
  13 ---
  14  drivers/net/dsa/b53/b53_mmap.c | 55 ++++++++++++++++++++++++++++++++++
  15  1 file changed, 55 insertions(+)
  16
  17 --- a/drivers/net/dsa/b53/b53_mmap.c
  18 +++ b/drivers/net/dsa/b53/b53_mmap.c
  19 @@ -16,6 +16,7 @@
  20   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  21   */
  22
  23 +#include <linux/bits.h>
  24  #include <linux/kernel.h>
  25  #include <linux/module.h>
  26  #include <linux/io.h>
  27 @@ -228,11 +229,65 @@ static const struct b53_io_ops b53_mmap_
  28         .write64 = b53_mmap_write64,
  29  };
  30
  31 +static int b53_mmap_probe_of(struct platform_device *pdev,
  32 +                            struct b53_platform_data **ppdata)
  33 +{
  34 +       struct device_node *np = pdev->dev.of_node;
  35 +       struct device_node *of_ports, *of_port;
  36 +       struct device *dev = &pdev->dev;
  37 +       struct b53_platform_data *pdata;
  38 +       void __iomem *mem;
  39 +
  40 +       mem = devm_platform_ioremap_resource(pdev, 0);
  41 +       if (IS_ERR(mem))
  42 +               return PTR_ERR(mem);
  43 +
  44 +       pdata = devm_kzalloc(dev, sizeof(struct b53_platform_data),
  45 +                            GFP_KERNEL);
  46 +       if (!pdata)
  47 +               return -ENOMEM;
  48 +
  49 +       pdata->regs = mem;
  50 +       pdata->chip_id = BCM63XX_DEVICE_ID;
  51 +       pdata->big_endian = of_property_read_bool(np, "big-endian");
  52 +
  53 +       of_ports = of_get_child_by_name(np, "ports");
  54 +       if (!of_ports) {
  55 +               dev_err(dev, "no ports child node found\n");
  56 +               return -EINVAL;
  57 +       }
  58 +
  59 +       for_each_available_child_of_node(of_ports, of_port) {
  60 +               u32 reg;
  61 +
  62 +               if (of_property_read_u32(of_port, "reg", &reg))
  63 +                       continue;
  64 +
  65 +               if (reg < B53_CPU_PORT)
  66 +                       pdata->enabled_ports |= BIT(reg);
  67 +       }
  68 +
  69 +       of_node_put(of_ports);
  70 +       *ppdata = pdata;
  71 +
  72 +       return 0;
  73 +}
  74 +
  75  static int b53_mmap_probe(struct platform_device *pdev)
  76  {
  77 +       struct device_node *np = pdev->dev.of_node;
  78         struct b53_platform_data *pdata = pdev->dev.platform_data;
  79         struct b53_mmap_priv *priv;
  80         struct b53_device *dev;
  81 +       int ret;
  82 +
  83 +       if (!pdata && np) {
  84 +               ret = b53_mmap_probe_of(pdev, &pdata);
  85 +               if (ret) {
  86 +                       dev_err(&pdev->dev, "OF probe error\n");
  87 +                       return ret;
  88 +               }
  89 +       }
  90
  91         if (!pdata)
  92                 return -EINVAL;