6.6-stable review patch. If anyone has any objections, please let me know.
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From: Sascha Hauer s.hauer@pengutronix.de
commit 1b2cb4d0b5b6a9d9fe78470704309ec75f8a1c3a upstream.
The ELE hardware internally has a word length of 4. However, among other things we store MAC addresses in the ELE OCOTP. With a length of 6 bytes these are naturally unaligned to the word length. Therefore we must support unaligned reads in reg_read() and indeed it works properly when reg_read() is called via nvmem_reg_read(). Setting the word size to 4 has the only visible effect that doing unaligned reads from userspace via bin_attr_nvmem_read() do not work because they are rejected by that function.
Given that we have to abstract from word accesses to byte accesses in the driver, set the word size to 1. This allows bytewise accesses from userspace to be able to test what the driver has to support anyway.
Fixes: 22e9e6fcfb50 ("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/20241230141901.263976-5-srinivas.kandagatla@linaro... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/nvmem/imx-ocotp-ele.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/nvmem/imx-ocotp-ele.c +++ b/drivers/nvmem/imx-ocotp-ele.c @@ -129,7 +129,7 @@ static int imx_ele_ocotp_probe(struct pl priv->config.owner = THIS_MODULE; priv->config.size = priv->data->size; priv->config.reg_read = priv->data->reg_read; - priv->config.word_size = 4; + priv->config.word_size = 1; priv->config.stride = 1; priv->config.priv = priv; priv->config.read_only = true;