linux-kernel - [PATCH v4 13/20] nvmem: core: allow to modify a cell before adding it

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Message-Id: <20221123180151.2160033-14-michael@walle.cc>
Date:   Wed, 23 Nov 2022 19:01:44 +0100
From:   Michael Walle <michael@...le.cc>
To:     Jonathan Corbet <corbet@....net>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Sascha Hauer <s.hauer@...gutronix.de>
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        Michael Walle <michael@...le.cc>
Subject: [PATCH v4 13/20] nvmem: core: allow to modify a cell before adding it

Provide a way to modify a cell before it will get added. This is useful
to attach a custom post processing hook via a layout.

Signed-off-by: Michael Walle <michael@...le.cc>
---
changes since v3:
 - none

changes since v2:
 - none

changes since v1:
 - new patch

 drivers/nvmem/core.c           | 4 ++++
 include/linux/nvmem-provider.h | 5 +++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index e75642a675ae..ccbde9629f7f 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -694,6 +694,7 @@ static int nvmem_validate_keepouts(struct nvmem_device *nvmem)
 
 static int nvmem_add_cells_from_of(struct nvmem_device *nvmem)
 {
+	struct nvmem_layout *layout = nvmem->layout;
 	struct device *dev = &nvmem->dev;
 	struct nvmem_cell_entry *cell;
 	struct device_node *child;
@@ -730,6 +731,9 @@ static int nvmem_add_cells_from_of(struct nvmem_device *nvmem)
 
 		info.np = of_node_get(child);
 
+		if (layout && layout->fixup_cell_info)
+			layout->fixup_cell_info(nvmem, layout, &info);
+
 		ret = nvmem_add_one_cell(nvmem, &info);
 		kfree(info.name);
 		if (ret) {
diff --git a/include/linux/nvmem-provider.h b/include/linux/nvmem-provider.h
index 1930496d8854..bfaba5227ac9 100644
--- a/include/linux/nvmem-provider.h
+++ b/include/linux/nvmem-provider.h
@@ -157,6 +157,8 @@ struct nvmem_cell_table {
  * @add_cells:		Will be called if a nvmem device is found which
  *			has this layout. The function will add layout
  *			specific cells with nvmem_add_one_cell().
+ * @fixup_cell_info:	Will be called before a cell is added. Can be
+ *			used to modify the nvmem_cell_info.
  * @owner:		Pointer to struct module.
  * @node:		List node.
  *
@@ -170,6 +172,9 @@ struct nvmem_layout {
 	const struct of_device_id *of_match_table;
 	int (*add_cells)(struct device *dev, struct nvmem_device *nvmem,
 			 struct nvmem_layout *layout);
+	void (*fixup_cell_info)(struct nvmem_device *nvmem,
+				struct nvmem_layout *layout,
+				struct nvmem_cell_info *cell);
 
 	/* private */
 	struct module *owner;
-- 
2.30.2