drivers: modem_cellular: Add autostart support for BG95 #93066
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rerickson1
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Add optional autostarts boolean to the quectel,bg95 binding and make MODEM_CELLULAR_DEFINE_INSTANCE() use it through DT_PROP_OR(). Boards that carry a BG95-M3 Mini-PCIe card—or any other variant that boots at VCC can now declare the property and skip the PWRKEY pulse, while existing designs continue to behave unchanged. Signed-off-by: Van Petrosyan <[email protected]>
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In PR #92794 we made
mdm-power-gpiosoptional, as the BG95-M3 Mini-PCIe module boots automatically via its on-module “Automatic Power-On Circuit”. In the currentmodem_cellulardriver we have theautostartproperty for BG95 hardcoded tofalse, but that depends on the form factor.This patch adds a simple
autostartboolean to the quectel,bg95 binding and a one-line change to the driver:If the board declares autostart; the driver skips the power-pulse routine; if the property is absent we fall back to the original hard-coded value so existing designs stay exactly as they are.
It might look convenient to assume “no
mdm-power-gpios⇒ autostart”, but in reality we can havemdm-power-gpiosrouted viaPERST#pin of BG95-M3 to use as a reset, but still have the autostart functionality enabled.Tested on a custom board with BG95-M3, with both
autostartenabled and disabled. When enabled the driver switches from idle to await power on state immediately.