mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-08-29 11:37:59 -04:00
ae49d58429
The KSZ9031RNX reference manual [1] DS00002117K page 62 FIGURE 7-5: POWER-UP/POWER-DOWN/RESET TIMING Note 2 states, that after the de-assertion of reset, wait a minimum of 100 us before starting programming on the MIIM (MDC/MDIO) interface. Set DT property reset-deassert-us to three times that, 300 us, to provide ample time between reset deassertion and MDIO access. The KSZ9031RNX reference manual [1] DS00002117K page 62 TABLE 7-4: POWER-UP/POWER-DOWN/RESET TIMING PARAMETERS row tSR Stable supply voltages to de-assertion of reset is at minimum 10 ms. Set DT property reset-assert-us to 10ms because the KSZ9031RNX RM does not explicitly spell out how long the reset has to be asserted, but this at least covers the worst case scenario. [1] https://ww1.microchip.com/downloads/aemDocuments/documents/UNG/ProductDocuments/DataSheets/KSZ9031RNX-Data-Sheet-DS00002117.pdf Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Link: https://patch.msgid.link/20260505034325.167797-5-marek.vasut+renesas@mailbox.org Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>