93 lines
2.8 KiB
Diff
93 lines
2.8 KiB
Diff
From d0221a780cbc99fec6c27a98dba2828dc5735c00 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 14:19:57 +0100
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Subject: [PATCH] nvmem: imx-ocotp: add support for post processing
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Add .cell_post_process callback for imx-ocotp to deal with MAC address,
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since MAC address need to be reversed byte for some i.MX SoCs.
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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/20211013131957.30271-4-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/imx-ocotp.c | 25 +++++++++++++++++++++++++
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1 file changed, 25 insertions(+)
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--- a/drivers/nvmem/imx-ocotp.c
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+++ b/drivers/nvmem/imx-ocotp.c
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@@ -97,6 +97,7 @@ struct ocotp_params {
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unsigned int bank_address_words;
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void (*set_timing)(struct ocotp_priv *priv);
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struct ocotp_ctrl_reg ctrl;
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+ bool reverse_mac_address;
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};
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static int imx_ocotp_wait_for_busy(struct ocotp_priv *priv, u32 flags)
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@@ -221,6 +222,25 @@ read_end:
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return ret;
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}
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+static int imx_ocotp_cell_pp(void *context, const char *id, unsigned int offset,
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+ void *data, size_t bytes)
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+{
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+ struct ocotp_priv *priv = context;
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+
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+ /* Deal with some post processing of nvmem cell data */
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+ if (id && !strcmp(id, "mac-address")) {
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+ if (priv->params->reverse_mac_address) {
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+ u8 *buf = data;
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+ int i;
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+
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+ for (i = 0; i < bytes/2; i++)
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+ swap(buf[i], buf[bytes - i - 1]);
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+ }
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+ }
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+
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+ return 0;
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+}
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+
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static void imx_ocotp_set_imx6_timing(struct ocotp_priv *priv)
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{
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unsigned long clk_rate;
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@@ -468,6 +488,7 @@ static struct nvmem_config imx_ocotp_nvm
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.stride = 1,
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.reg_read = imx_ocotp_read,
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.reg_write = imx_ocotp_write,
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+ .cell_post_process = imx_ocotp_cell_pp,
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};
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static const struct ocotp_params imx6q_params = {
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@@ -530,6 +551,7 @@ static const struct ocotp_params imx8mq_
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.bank_address_words = 0,
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.set_timing = imx_ocotp_set_imx6_timing,
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.ctrl = IMX_OCOTP_BM_CTRL_DEFAULT,
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+ .reverse_mac_address = true,
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};
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static const struct ocotp_params imx8mm_params = {
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@@ -537,6 +559,7 @@ static const struct ocotp_params imx8mm_
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.bank_address_words = 0,
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.set_timing = imx_ocotp_set_imx6_timing,
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.ctrl = IMX_OCOTP_BM_CTRL_DEFAULT,
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+ .reverse_mac_address = true,
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};
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static const struct ocotp_params imx8mn_params = {
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@@ -544,6 +567,7 @@ static const struct ocotp_params imx8mn_
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.bank_address_words = 0,
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.set_timing = imx_ocotp_set_imx6_timing,
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.ctrl = IMX_OCOTP_BM_CTRL_DEFAULT,
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+ .reverse_mac_address = true,
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};
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static const struct ocotp_params imx8mp_params = {
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@@ -551,6 +575,7 @@ static const struct ocotp_params imx8mp_
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.bank_address_words = 0,
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.set_timing = imx_ocotp_set_imx6_timing,
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.ctrl = IMX_OCOTP_BM_CTRL_8MP,
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+ .reverse_mac_address = true,
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};
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static const struct of_device_id imx_ocotp_dt_ids[] = {
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