target/linux/generic/backport-5.15/820-v6.7-0005-nvmem-Do-not-expect-fixed-layouts-to-grab-a-layout-d.patch

   1 From b7c1e53751cb3990153084f31c41f25fde3b629c Mon Sep 17 00:00:00 2001
   2 From: Miquel Raynal <miquel.raynal@bootlin.com>
   3 Date: Fri, 24 Nov 2023 20:38:14 +0100
   4 Subject: [PATCH] nvmem: Do not expect fixed layouts to grab a layout driver
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 Two series lived in parallel for some time, which led to this situation:
  10 - The nvmem-layout container is used for dynamic layouts
  11 - We now expect fixed layouts to also use the nvmem-layout container but
  12 this does not require any additional driver, the support is built-in the
  13 nvmem core.
  14
  15 Ensure we don't refuse to probe for wrong reasons.
  16
  17 Fixes: 27f699e578b1 ("nvmem: core: add support for fixed cells *layout*")
  18 Cc: stable@vger.kernel.org
  19 Reported-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
  20 Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
  21 Tested-by: Rafał Miłecki <rafal@milecki.pl>
  22 Tested-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
  23 Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
  24
  25 Link: https://lore.kernel.org/r/20231124193814.360552-1-miquel.raynal@bootlin.com
  26 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  27 ---
  28  drivers/nvmem/core.c | 6 ++++++
  29  1 file changed, 6 insertions(+)
  30
  31 --- a/drivers/nvmem/core.c
  32 +++ b/drivers/nvmem/core.c
  33 @@ -797,6 +797,12 @@ static struct nvmem_layout *nvmem_layout
  34         if (!layout_np)
  35                 return NULL;
  36
  37 +       /* Fixed layouts don't have a matching driver */
  38 +       if (of_device_is_compatible(layout_np, "fixed-layout")) {
  39 +               of_node_put(layout_np);
  40 +               return NULL;
  41 +       }
  42 +
  43         /*
  44          * In case the nvmem device was built-in while the layout was built as a
  45          * module, we shall manually request the layout driver loading otherwise