1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
From 5008062f1c3f5af3acf86164aa6fcc77b0c7bdce Mon Sep 17 00:00:00 2001
From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Date: Wed, 13 Oct 2021 14:19:56 +0100
Subject: [PATCH] nvmem: core: add nvmem cell post processing callback
Some NVMEM providers have certain nvmem cells encoded, which requires
post processing before actually using it.
For example mac-address is stored in either in ascii or delimited or reverse-order.
Having a post-process callback hook to provider drivers would enable them to
do this vendor specific post processing before nvmem consumers see it.
Tested-by: Joakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20211013131957.30271-3-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/nvmem/core.c | 9 +++++++++
include/linux/nvmem-provider.h | 5 +++++
2 files changed, 14 insertions(+)
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -38,6 +38,7 @@ struct nvmem_device {
unsigned int nkeepout;
nvmem_reg_read_t reg_read;
nvmem_reg_write_t reg_write;
+ nvmem_cell_post_process_t cell_post_process;
struct gpio_desc *wp_gpio;
void *priv;
};
@@ -799,6 +800,7 @@ struct nvmem_device *nvmem_register(cons
nvmem->type = config->type;
nvmem->reg_read = config->reg_read;
nvmem->reg_write = config->reg_write;
+ nvmem->cell_post_process = config->cell_post_process;
nvmem->keepout = config->keepout;
nvmem->nkeepout = config->nkeepout;
if (config->of_node)
@@ -1444,6 +1446,13 @@ static int __nvmem_cell_read(struct nvme
if (cell->bit_offset || cell->nbits)
nvmem_shift_read_buffer_in_place(cell, buf);
+ if (nvmem->cell_post_process) {
+ rc = nvmem->cell_post_process(nvmem->priv, id,
+ cell->offset, buf, cell->bytes);
+ if (rc)
+ return rc;
+ }
+
if (len)
*len = cell->bytes;
--- a/include/linux/nvmem-provider.h
+++ b/include/linux/nvmem-provider.h
@@ -19,6 +19,9 @@ typedef int (*nvmem_reg_read_t)(void *pr
void *val, size_t bytes);
typedef int (*nvmem_reg_write_t)(void *priv, unsigned int offset,
void *val, size_t bytes);
+/* used for vendor specific post processing of cell data */
+typedef int (*nvmem_cell_post_process_t)(void *priv, const char *id, unsigned int offset,
+ void *buf, size_t bytes);
enum nvmem_type {
NVMEM_TYPE_UNKNOWN = 0,
@@ -62,6 +65,7 @@ struct nvmem_keepout {
* @no_of_node: Device should not use the parent's of_node even if it's !NULL.
* @reg_read: Callback to read data.
* @reg_write: Callback to write data.
+ * @cell_post_process: Callback for vendor specific post processing of cell data
* @size: Device size.
* @word_size: Minimum read/write access granularity.
* @stride: Minimum read/write access stride.
@@ -92,6 +96,7 @@ struct nvmem_config {
bool no_of_node;
nvmem_reg_read_t reg_read;
nvmem_reg_write_t reg_write;
+ nvmem_cell_post_process_t cell_post_process;
int size;
int word_size;
int stride;
|
