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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>
This commit is contained in:
Srinivas Kandagatla 2021-10-13 14:19:57 +01:00 committed by Greg Kroah-Hartman
parent 5008062f1c
commit d0221a780c
1 changed files with 25 additions and 0 deletions
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25
drivers/nvmem/imx-ocotp.c
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@ -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_nvmem_config = {
.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_params = {
.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_params = {
.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_params = {
.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_params = {
.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[] = {