From: Michael Walle <michael@walle.cc>
To: Jonathan Corbet <corbet@lwn.net>,
Srinivas Kandagatla <srinivas.kandagatla@linaro.org>,
Miquel Raynal <miquel.raynal@bootlin.com>,
Rob Herring <robh+dt@kernel.org>,
Frank Rowand <frowand.list@gmail.com>
Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
Michael Walle <michael@walle.cc>
Subject: [PATCH v3 10/18] nvmem: core: add per-cell post processing
Date: Fri, 18 Nov 2022 19:51:10 +0100 [thread overview]
Message-ID: <20221118185118.1190044-11-michael@walle.cc> (raw)
In-Reply-To: <20221118185118.1190044-1-michael@walle.cc>
Instead of relying on the name the consumer is using for the cell, like
it is done for the nvmem .cell_post_process configuration parameter,
provide a per-cell post processing hook. This can then be populated by
the NVMEM provider (or the NVMEM layout) when adding the cell.
Signed-off-by: Michael Walle <michael@walle.cc>
---
changes since v2:
- none
changes since v1:
- rename hook to read_post_process
drivers/nvmem/core.c | 17 +++++++++++++++++
include/linux/nvmem-provider.h | 3 +++
2 files changed, 20 insertions(+)
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 4ad1a02faf30..f0c0bf3b8b25 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -53,6 +53,7 @@ struct nvmem_cell_entry {
int bytes;
int bit_offset;
int nbits;
+ nvmem_cell_post_process_t read_post_process;
struct device_node *np;
struct nvmem_device *nvmem;
struct list_head node;
@@ -469,6 +470,7 @@ static int nvmem_cell_info_to_nvmem_cell_entry_nodup(struct nvmem_device *nvmem,
cell->offset = info->offset;
cell->bytes = info->bytes;
cell->name = info->name;
+ cell->read_post_process = info->read_post_process;
cell->bit_offset = info->bit_offset;
cell->nbits = info->nbits;
@@ -1553,6 +1555,13 @@ static int __nvmem_cell_read(struct nvmem_device *nvmem,
if (cell->bit_offset || cell->nbits)
nvmem_shift_read_buffer_in_place(cell, buf);
+ if (cell->read_post_process) {
+ rc = cell->read_post_process(nvmem->priv, id, index,
+ cell->offset, buf, cell->bytes);
+ if (rc)
+ return rc;
+ }
+
if (nvmem->cell_post_process) {
rc = nvmem->cell_post_process(nvmem->priv, id, index,
cell->offset, buf, cell->bytes);
@@ -1661,6 +1670,14 @@ static int __nvmem_cell_entry_write(struct nvmem_cell_entry *cell, void *buf, si
(cell->bit_offset == 0 && len != cell->bytes))
return -EINVAL;
+ /*
+ * Any cells which have a read_post_process hook are read-only because
+ * we cannot reverse the operation and it might affect other cells,
+ * too.
+ */
+ if (cell->read_post_process)
+ return -EINVAL;
+
if (cell->bit_offset || cell->nbits) {
buf = nvmem_cell_prepare_write_buffer(cell, buf, len);
if (IS_ERR(buf))
diff --git a/include/linux/nvmem-provider.h b/include/linux/nvmem-provider.h
index 4185767c114f..1930496d8854 100644
--- a/include/linux/nvmem-provider.h
+++ b/include/linux/nvmem-provider.h
@@ -54,6 +54,8 @@ struct nvmem_keepout {
* @bit_offset: Bit offset if cell is smaller than a byte.
* @nbits: Number of bits.
* @np: Optional device_node pointer.
+ * @read_post_process: Callback for optional post processing of cell data
+ * on reads.
*/
struct nvmem_cell_info {
const char *name;
@@ -62,6 +64,7 @@ struct nvmem_cell_info {
unsigned int bit_offset;
unsigned int nbits;
struct device_node *np;
+ nvmem_cell_post_process_t read_post_process;
};
/**
--
2.30.2
next prev parent reply other threads:[~2022-11-18 18:52 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-18 18:51 [PATCH v3 00/18] nvmem: core: introduce NVMEM layouts Michael Walle
2022-11-18 18:51 ` [PATCH v3 01/18] net: add helper eth_addr_add() Michael Walle
2022-11-18 18:51 ` [PATCH v3 02/18] of: base: add of_parse_phandle_with_optional_args() Michael Walle
2022-11-18 21:31 ` Michael Walle
2022-11-18 21:40 ` [PATCH] of: property: special #nvmem-cell-cells handling Michael Walle
2022-11-18 21:52 ` Rob Herring
2022-11-18 22:03 ` Michael Walle
2022-11-22 23:44 ` Rob Herring
2022-11-23 12:24 ` Miquel Raynal
2022-11-18 18:51 ` [PATCH v3 03/18] nvmem: core: fix device node refcounting Michael Walle
2022-11-18 18:51 ` [PATCH v3 04/18] nvmem: core: add an index parameter to the cell Michael Walle
2022-11-18 18:51 ` [PATCH v3 05/18] nvmem: core: move struct nvmem_cell_info to nvmem-provider.h Michael Walle
2022-11-18 18:51 ` [PATCH v3 06/18] nvmem: core: drop the removal of the cells in nvmem_add_cells() Michael Walle
2022-11-21 7:56 ` Sascha Hauer
2022-11-18 18:51 ` [PATCH v3 07/18] nvmem: core: add nvmem_add_one_cell() Michael Walle
2022-11-18 18:51 ` [PATCH v3 08/18] nvmem: core: use nvmem_add_one_cell() in nvmem_add_cells_from_of() Michael Walle
2022-11-18 18:51 ` [PATCH v3 09/18] nvmem: core: introduce NVMEM layouts Michael Walle
2022-11-18 18:51 ` Michael Walle [this message]
2022-11-18 18:51 ` [PATCH v3 11/18] nvmem: core: allow to modify a cell before adding it Michael Walle
2022-11-18 18:51 ` [PATCH v3 12/18] nvmem: imx-ocotp: replace global post processing with layouts Michael Walle
2022-11-18 18:51 ` [PATCH v3 13/18] nvmem: cell: drop global cell_post_process Michael Walle
2022-11-18 18:51 ` [PATCH v3 14/18] nvmem: core: provide own priv pointer in post process callback Michael Walle
2022-11-18 18:51 ` [PATCH v3 15/18] nvmem: layouts: add sl28vpd layout Michael Walle
2022-11-18 18:51 ` [PATCH v3 16/18] MAINTAINERS: add myself as sl28vpd nvmem layout driver Michael Walle
2022-11-18 18:51 ` [PATCH v3 17/18] nvmem: layouts: Add ONIE tlv " Michael Walle
2022-11-21 7:51 ` Sascha Hauer
2022-11-23 9:52 ` Michael Walle
2022-11-18 18:51 ` [PATCH v3 18/18] MAINTAINERS: Add myself as ONIE tlv NVMEM layout maintainer Michael Walle
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