Messages in this thread |  | | From | Bryan O'Donoghue <> | Subject | [PATCH v2 0/7] Fix i.MX7D OCOTP write support | Date | Sun, 8 Oct 2017 23:41:15 +0100 |
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V2: - Added Reviewed-by and Acked-by as indicated by Philipp - octp_params -> ocotp_params Philipp Zabel - Added whitespace to aggregate initaliser - Philipp Zabel - Dropped (void*) cast to data - Philipp Zabel - Made use of of_device_get_match_data - Philipp Zabel - Got rid of params->banked - Philipp Zabel - Changed regs_per_bank to bank_address_words makes the intent of the parameter clearer - Bryan O'Donoghue
V1: (Resend: I may have missed Philip Zabel on the first send - apologies if that is the case Philip.)
The current OCOTP driver added support for i.MX7 read access and then added support for i.MX6 write access. Between the two commits the fact that the added write routine was only appropriate for i.MX6 was missed.
As a result its certain that attempting to write i.MX7 OTP fuses on Linux would fail as the destination address on i.MX7 is different to i.MX6.
Without the update to the i.MX7 setup and hold timings it's not clear that a write operation would actually do any writing which means the bad addressing on i.MX7 might not actually destroy the wrong OTP fuses, it probably would just fail to do anything, understandably I haven't experimented with knowingly bad values for one-time-programmable fuses.
This series fixes the gap by:
1. Switching off OTP writing for i.MX7 2. Adding in support for the i.MX7 way of doing things 3. Switching OTP write support back on for i.MX7
There's an additional small fix for the naming of the module then to indicate it works for i.MX7 as well as for i.MX6.
Bryan O'Donoghue (7): nvmem: imx-ocotp: Restrict OTP write to IMX6 processors nvmem: imx-ocotp: Pass parameters via a struct nvmem: imx-ocotp: Add support for banked OTP addressing nvmem: imx-ocotp: Move i.MX6 write clock setup to dedicated function nvmem: imx-ocotp: Add i.MX7D timing write clock setup support nvmem: imx-ocotp: Enable i.MX7D OTP write support nvmem: imx-ocotp: Update module description
drivers/nvmem/imx-ocotp.c | 182 +++++++++++++++++++++++++++++++++++++--------- 1 file changed, 147 insertions(+), 35 deletions(-)
-- 2.7.4
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