Messages in this thread | | | Date | Tue, 19 May 2020 11:32:47 +0100 | From | Mark Brown <> | Subject | Re: [PATCH 2/2] spi: Add Baikal-T1 System Boot SPI Controller driver |
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On Tue, May 19, 2020 at 12:17:27AM +0300, Serge Semin wrote:
> Here is what we need to do to perform the EEPROM-read operation: > 1) Enable EEPROM-read mode. > 2) Initialize a corresponding registers with a number of SPI transfer words > (with bits-per-word taken into account) to read. > 3) Push opcode + address + dummy bytes into the Tx FIFO. When it's done and > the Tx FIFO is empty, the controller will proceed with read operations by > pushing zeros (or ones, don't remember what level it's by default) to MOSI > and pulling data from MISO into the RX FIFO. > 4) Keep up with getting data from the Rx FIFO so one wouldn't get overflown.
> Regarding programming write each time. Well, it's up to the driver implementation. > If opcode, address, dummy bytes and number of words to read are the same as before, > then re-programming isn't required.
Ah, nice. This should be useful for far more than just flash - most register reads will also be able to take advantage of this, they follow a similar write then read pattern. [unhandled content-type:application/pgp-signature] | |