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From d0221a780cbc99fec6c27a98dba2828dc5735c00 Mon Sep 17 00:00:00 2001
From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Date: Wed, 13 Oct 2021 14:19:57 +0100
Subject: [PATCH] nvmem: imx-ocotp: add support for post processing
Add .cell_post_process callback for imx-ocotp to deal with MAC address,
since MAC address need to be reversed byte for some i.MX SoCs.
Tested-by: Joakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20211013131957.30271-4-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/nvmem/imx-ocotp.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
--- a/drivers/nvmem/imx-ocotp.c
+++ b/drivers/nvmem/imx-ocotp.c
@@ -97,6 +97,7 @@ struct ocotp_params {
unsigned int bank_address_words;
void (*set_timing)(struct ocotp_priv *priv);
struct ocotp_ctrl_reg ctrl;
+ bool reverse_mac_address;
};
static int imx_ocotp_wait_for_busy(struct ocotp_priv *priv, u32 flags)
@@ -221,6 +222,25 @@ read_end:
return ret;
}
+static int imx_ocotp_cell_pp(void *context, const char *id, unsigned int offset,
+ void *data, size_t bytes)
+{
+ struct ocotp_priv *priv = context;
+
+ /* Deal with some post processing of nvmem cell data */
+ if (id && !strcmp(id, "mac-address")) {
+ if (priv->params->reverse_mac_address) {
+ u8 *buf = data;
+ int i;
+
+ for (i = 0; i < bytes/2; i++)
+ swap(buf[i], buf[bytes - i - 1]);
+ }
+ }
+
+ return 0;
+}
+
static void imx_ocotp_set_imx6_timing(struct ocotp_priv *priv)
{
unsigned long clk_rate;
@@ -468,6 +488,7 @@ static struct nvmem_config imx_ocotp_nvm
.stride = 1,
.reg_read = imx_ocotp_read,
.reg_write = imx_ocotp_write,
+ .cell_post_process = imx_ocotp_cell_pp,
};
static const struct ocotp_params imx6q_params = {
@@ -530,6 +551,7 @@ static const struct ocotp_params imx8mq_
.bank_address_words = 0,
.set_timing = imx_ocotp_set_imx6_timing,
.ctrl = IMX_OCOTP_BM_CTRL_DEFAULT,
+ .reverse_mac_address = true,
};
static const struct ocotp_params imx8mm_params = {
@@ -537,6 +559,7 @@ static const struct ocotp_params imx8mm_
.bank_address_words = 0,
.set_timing = imx_ocotp_set_imx6_timing,
.ctrl = IMX_OCOTP_BM_CTRL_DEFAULT,
+ .reverse_mac_address = true,
};
static const struct ocotp_params imx8mn_params = {
@@ -544,6 +567,7 @@ static const struct ocotp_params imx8mn_
.bank_address_words = 0,
.set_timing = imx_ocotp_set_imx6_timing,
.ctrl = IMX_OCOTP_BM_CTRL_DEFAULT,
+ .reverse_mac_address = true,
};
static const struct ocotp_params imx8mp_params = {
@@ -551,6 +575,7 @@ static const struct ocotp_params imx8mp_
.bank_address_words = 0,
.set_timing = imx_ocotp_set_imx6_timing,
.ctrl = IMX_OCOTP_BM_CTRL_8MP,
+ .reverse_mac_address = true,
};
static const struct of_device_id imx_ocotp_dt_ids[] = {
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