Hi Ariel, Am 19.10.2015 um 19:32 schrieb Ariel D'Alessandro: > This commit adds support for NXP LPC18xx EEPROM memory found in NXP > LPC185x/3x and LPC435x/3x/2x/1x devices. > > EEPROM size is 16384 bytes and it can be entirely read and > written/erased with 1 word (4 bytes) granularity. The last page > (128 bytes) contains the EEPROM initialization data and is not writable. > > Erase/program time is less than 3ms. The EEPROM device requires a > ~1500 kHz clock (min 800 kHz, max 1600 kHz) that is generated dividing > the system bus clock by the division factor, contained in the divider > register (minus 1 encoded). > > Signed-off-by: Ariel D'Alessandro <[email protected]> > --- > drivers/nvmem/Kconfig | 9 ++ > drivers/nvmem/Makefile | 2 + > drivers/nvmem/lpc18xx_eeprom.c | 266 > +++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 277 insertions(+) > create mode 100644 drivers/nvmem/lpc18xx_eeprom.c > [...] > + > +static int lpc18xx_eeprom_gather_write(void *context, const void *reg, > + size_t reg_size, const void *val, > + size_t val_size) > +{ > + struct lpc18xx_eeprom_dev *eeprom = context; > + unsigned int offset = *(u32 *)reg; > + > + /* 3 ms of erase/program time between each writing */ > + while (val_size) { > + writel(*(u32 *)val, eeprom->mem_base + offset); > + usleep_range(3000, 4000);
i think it would be good to verify that the EEPROM write operation has really finished. Best regards Stefan > + val_size -= eeprom->val_bytes; > + val += eeprom->val_bytes; > + offset += eeprom->val_bytes; > + } > + > + return 0; > +} -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
