83 lines
3.0 KiB
Diff
83 lines
3.0 KiB
Diff
From 5008062f1c3f5af3acf86164aa6fcc77b0c7bdce Mon Sep 17 00:00:00 2001
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From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
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Date: Wed, 13 Oct 2021 14:19:56 +0100
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Subject: [PATCH] nvmem: core: add nvmem cell post processing callback
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Some NVMEM providers have certain nvmem cells encoded, which requires
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post processing before actually using it.
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For example mac-address is stored in either in ascii or delimited or reverse-order.
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Having a post-process callback hook to provider drivers would enable them to
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do this vendor specific post processing before nvmem consumers see it.
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Tested-by: Joakim Zhang <qiangqing.zhang@nxp.com>
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Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
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Link: https://lore.kernel.org/r/20211013131957.30271-3-srinivas.kandagatla@linaro.org
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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---
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drivers/nvmem/core.c | 9 +++++++++
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include/linux/nvmem-provider.h | 5 +++++
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2 files changed, 14 insertions(+)
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--- a/drivers/nvmem/core.c
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+++ b/drivers/nvmem/core.c
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@@ -38,6 +38,7 @@ struct nvmem_device {
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unsigned int nkeepout;
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nvmem_reg_read_t reg_read;
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nvmem_reg_write_t reg_write;
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+ nvmem_cell_post_process_t cell_post_process;
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struct gpio_desc *wp_gpio;
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void *priv;
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};
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@@ -799,6 +800,7 @@ struct nvmem_device *nvmem_register(cons
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nvmem->type = config->type;
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nvmem->reg_read = config->reg_read;
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nvmem->reg_write = config->reg_write;
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+ nvmem->cell_post_process = config->cell_post_process;
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nvmem->keepout = config->keepout;
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nvmem->nkeepout = config->nkeepout;
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if (config->of_node)
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@@ -1444,6 +1446,13 @@ static int __nvmem_cell_read(struct nvme
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if (cell->bit_offset || cell->nbits)
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nvmem_shift_read_buffer_in_place(cell, buf);
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+ if (nvmem->cell_post_process) {
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+ rc = nvmem->cell_post_process(nvmem->priv, id,
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+ cell->offset, buf, cell->bytes);
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+ if (rc)
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+ return rc;
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+ }
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+
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if (len)
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*len = cell->bytes;
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--- a/include/linux/nvmem-provider.h
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+++ b/include/linux/nvmem-provider.h
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@@ -19,6 +19,9 @@ typedef int (*nvmem_reg_read_t)(void *pr
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void *val, size_t bytes);
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typedef int (*nvmem_reg_write_t)(void *priv, unsigned int offset,
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void *val, size_t bytes);
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+/* used for vendor specific post processing of cell data */
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+typedef int (*nvmem_cell_post_process_t)(void *priv, const char *id, unsigned int offset,
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+ void *buf, size_t bytes);
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enum nvmem_type {
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NVMEM_TYPE_UNKNOWN = 0,
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@@ -62,6 +65,7 @@ struct nvmem_keepout {
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* @no_of_node: Device should not use the parent's of_node even if it's !NULL.
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* @reg_read: Callback to read data.
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* @reg_write: Callback to write data.
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+ * @cell_post_process: Callback for vendor specific post processing of cell data
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* @size: Device size.
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* @word_size: Minimum read/write access granularity.
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* @stride: Minimum read/write access stride.
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@@ -92,6 +96,7 @@ struct nvmem_config {
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bool no_of_node;
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nvmem_reg_read_t reg_read;
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nvmem_reg_write_t reg_write;
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+ nvmem_cell_post_process_t cell_post_process;
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int size;
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int word_size;
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int stride;
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