target/linux/generic/backport-5.10/814-v6.4-0006-nvmem-core-allow-to-modify-a-cell-before-adding-it.patch

   1 From de12c9691501ccba41a154c223869f82be4c12fd Mon Sep 17 00:00:00 2001
   2 From: Michael Walle <michael@walle.cc>
   3 Date: Tue, 4 Apr 2023 18:21:25 +0100
   4 Subject: [PATCH] nvmem: core: allow to modify a cell before adding it
   5
   6 Provide a way to modify a cell before it will get added. This is useful
   7 to attach a custom post processing hook via a layout.
   8
   9 Signed-off-by: Michael Walle <michael@walle.cc>
  10 Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
  11 Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
  12 Link: https://lore.kernel.org/r/20230404172148.82422-18-srinivas.kandagatla@linaro.org
  13 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  14 ---
  15  drivers/nvmem/core.c           | 4 ++++
  16  include/linux/nvmem-provider.h | 5 +++++
  17  2 files changed, 9 insertions(+)
  18
  19 --- a/drivers/nvmem/core.c
  20 +++ b/drivers/nvmem/core.c
  21 @@ -695,6 +695,7 @@ static int nvmem_validate_keepouts(struc
  22
  23  static int nvmem_add_cells_from_of(struct nvmem_device *nvmem)
  24  {
  25 +       struct nvmem_layout *layout = nvmem->layout;
  26         struct device *dev = &nvmem->dev;
  27         struct device_node *child;
  28         const __be32 *addr;
  29 @@ -724,6 +725,9 @@ static int nvmem_add_cells_from_of(struc
  30
  31                 info.np = of_node_get(child);
  32
  33 +               if (layout && layout->fixup_cell_info)
  34 +                       layout->fixup_cell_info(nvmem, layout, &info);
  35 +
  36                 ret = nvmem_add_one_cell(nvmem, &info);
  37                 kfree(info.name);
  38                 if (ret) {
  39 --- a/include/linux/nvmem-provider.h
  40 +++ b/include/linux/nvmem-provider.h
  41 @@ -155,6 +155,8 @@ struct nvmem_cell_table {
  42   * @add_cells:         Will be called if a nvmem device is found which
  43   *                     has this layout. The function will add layout
  44   *                     specific cells with nvmem_add_one_cell().
  45 + * @fixup_cell_info:   Will be called before a cell is added. Can be
  46 + *                     used to modify the nvmem_cell_info.
  47   * @owner:             Pointer to struct module.
  48   * @node:              List node.
  49   *
  50 @@ -168,6 +170,9 @@ struct nvmem_layout {
  51         const struct of_device_id *of_match_table;
  52         int (*add_cells)(struct device *dev, struct nvmem_device *nvmem,
  53                          struct nvmem_layout *layout);
  54 +       void (*fixup_cell_info)(struct nvmem_device *nvmem,
  55 +                               struct nvmem_layout *layout,
  56 +                               struct nvmem_cell_info *cell);
  57
  58         /* private */
  59         struct module *owner;