Commit d0221a78 authored by Srinivas Kandagatla's avatar Srinivas Kandagatla Committed by Greg Kroah-Hartman
Browse files

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: default avatarJoakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: default avatarSrinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20211013131957.30271-4-srinivas.kandagatla@linaro.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 5008062f

drivers/nvmem/imx-ocotp.c

+25 −0
Original line number Diff line number Diff line
@@ -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 @@ static int imx_ocotp_read(void *context, unsigned int offset, 
	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[] = {