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nvmem: imx-ocotp: Restrict OTP write to IMX6 processors 

i.MX7S/D have a different scheme for addressing the OTP registers inside
the OCOTP block. Currently it's possible to address the wrong OTP registers
given the disparity between IMX6 and IMX7 OTP addressing.

Since OTP programming is one-time destructive its important we restrict
this interface ASAP.

Fixes: 0642bac7da ("nvmem: imx-ocotp: add write support")

Signed-off-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bryan O'Donoghue 2017-10-24 10:54:27 +01:00 committed by Greg Kroah-Hartman
parent 71c5dd5002
commit 9d6a8dab8d
1 changed files with 2 additions and 0 deletions
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2
drivers/nvmem/imx-ocotp.c
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@ -346,6 +346,8 @@ static int imx_ocotp_probe(struct platform_device *pdev)
imx_ocotp_nvmem_config.dev = dev; imx_ocotp_nvmem_config.dev = dev;
imx_ocotp_nvmem_config.priv = priv; imx_ocotp_nvmem_config.priv = priv;
priv->config = &imx_ocotp_nvmem_config; priv->config = &imx_ocotp_nvmem_config;
if (of_device_is_compatible(pdev->dev.of_node, "fsl,imx7d-ocotp"))
imx_ocotp_nvmem_config.read_only = true;
nvmem = nvmem_register(&imx_ocotp_nvmem_config); nvmem = nvmem_register(&imx_ocotp_nvmem_config);
if (IS_ERR(nvmem)) if (IS_ERR(nvmem))