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- From d0221a780cbc99fec6c27a98dba2828dc5735c00 Mon Sep 17 00:00:00 2001
- From: Srinivas Kandagatla <[email protected]>
- 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 <[email protected]>
- Signed-off-by: Srinivas Kandagatla <[email protected]>
- Link: https://lore.kernel.org/r/[email protected]
- Signed-off-by: Greg Kroah-Hartman <[email protected]>
- ---
- 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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