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nvmem: imx-ocotp-ele: fix MAC address byte order

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According to the i.MX93 Fusemap the two MAC addresses are stored in
words 315 to 317 like this:

315	MAC1_ADDR_31_0[31:0]
316	MAC1_ADDR_47_32[47:32]
	MAC2_ADDR_15_0[15:0]
317	MAC2_ADDR_47_16[31:0]

This means the MAC addresses are stored in reverse byte order. We have
to swap the bytes before passing them to the upper layers. The storage
format is consistent to the one used on i.MX6 using imx-ocotp driver
which does the same byte swapping as introduced here.

With this patch the MAC address on my i.MX93 TQ board correctly reads as
00:d0:93:6b:27:b8 instead of b8:27:6b:93:d0:00.

Fixes: 22e9e6fcfb ("nvmem: imx: support i.MX93 OCOTP")
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Cc: stable <stable@kernel.org>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20241230141901.263976-4-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sascha Hauer 2024-12-30 14:18:58 +00:00 committed by Greg Kroah-Hartman
parent 3c9e2cb6ce
commit 391b06ecb6
1 changed files with 22 additions and 0 deletions
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22
drivers/nvmem/imx-ocotp-ele.c
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@ -111,6 +111,26 @@ static int imx_ocotp_reg_read(void *context, unsigned int offset, void *val, siz
return 0;
};
static int imx_ocotp_cell_pp(void *context, const char *id, int index,
unsigned int offset, void *data, size_t bytes)
{
u8 *buf = data;
int i;
/* Deal with some post processing of nvmem cell data */
if (id && !strcmp(id, "mac-address"))
for (i = 0; i < bytes / 2; i++)
swap(buf[i], buf[bytes - i - 1]);
return 0;
}
static void imx_ocotp_fixup_dt_cell_info(struct nvmem_device *nvmem,
struct nvmem_cell_info *cell)
{
cell->read_post_process = imx_ocotp_cell_pp;
}
static int imx_ele_ocotp_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@ -137,6 +157,8 @@ static int imx_ele_ocotp_probe(struct platform_device *pdev)
priv->config.stride = 1;
priv->config.priv = priv;
priv->config.read_only = true;
priv->config.add_legacy_fixed_of_cells = true;
priv->config.fixup_dt_cell_info = imx_ocotp_fixup_dt_cell_info;
mutex_init(&priv->lock);
nvmem = devm_nvmem_register(dev, &priv->config);