https://wiki.dissonant.dev/index.php?action=history&feed=atom&title=Mainline%3ABroadcom_Kona%2FBCM590xx%2FRegulators 2026-04-15T02:39:19Z Revision history for this page on the wiki MediaWiki 1.43.6 https://wiki.dissonant.dev/index.php?title=Mainline:Broadcom_Kona/BCM590xx/Regulators&diff=143&oldid=prev 2025-09-15T19:46:20Z

<p>Created page with &quot;{{hatnote|Relevant downstream drivers: {{downstream|baffinlite|drivers/regulator/bcmpmu59xxx-regulator.c}}; {{downstream|baffinlite|bcmpmu-regulator.c}}; {{downstream|baffinlite|drivers/regulator/bcm590xx-regulator.c}} and {{downstream|baffinlite|drivers/regulator/bcm59055_regulator.c}} for BCM59055.}} The BCM590xx PMUs have configurable voltage regulators. == Regulator types == There are two types of regulators: &#039;&#039;&#039;LDO&#039;&#039;&#039; (low dropout) and &#039;&#039;&#039;SR&#039;&#039;&#039; (switcher). Regula...&quot;</p> <p><b>New page</b></p><div>{{hatnote|Relevant downstream drivers: {{downstream|baffinlite|drivers/regulator/bcmpmu59xxx-regulator.c}}; {{downstream|baffinlite|bcmpmu-regulator.c}}; {{downstream|baffinlite|drivers/regulator/bcm590xx-regulator.c}} and {{downstream|baffinlite|drivers/regulator/bcm59055_regulator.c}} for BCM59055.}}<br /> <br /> The BCM590xx PMUs have configurable voltage regulators.<br /> <br /> == Regulator types ==<br /> <br /> There are two types of regulators: &#039;&#039;&#039;LDO&#039;&#039;&#039; (low dropout) and &#039;&#039;&#039;SR&#039;&#039;&#039; (switcher). Regulator names are suffixed with these shortcuts to indicate their type (e.g. &#039;&#039;LVLDO1&#039;&#039; is an LDO, &#039;&#039;CSR&#039;&#039; is an SR).<br /> <br /> == Operating modes ==<br /> <br /> The operating modes for each regulator are stored in &lt;code&gt;PMMODE&lt;/code&gt; registers. These registers are used to store operating modes for various &#039;&#039;&#039;PC&#039;&#039;&#039; (pin control) configurations. The mode that ends up being used is determined based on the state of PC1 and PC2 pins (and optionally the GPIO1 pin, if it&#039;s configured to the PC3 function in GPIOCTRL).<br /> <br /> &#039;&#039;&#039;LDOs&#039;&#039;&#039; have &#039;&#039;&#039;2-bit modes&#039;&#039;&#039;. The available modes are &lt;code&gt;ON&lt;/code&gt; (0), &lt;code&gt;LPM&lt;/code&gt; (low power mode; 1) and &lt;code&gt;OFF&lt;/code&gt; (2). {{speculation|Mode 3 is presumably invalid, but hasn&#039;t been tested.}}<br /> <br /> &#039;&#039;&#039;SRs&#039;&#039;&#039; have &#039;&#039;&#039;3-bit modes&#039;&#039;&#039;. The exact function of each mode is unknown; the vendor kernel does not bother with the distinction and applies the LDO modes described above.<br /> <br /> LDOs get 2 PMMODE registers each; SRs get 4 PMMODE registers. This is to accomodate the different mode sizes.<br /> <br /> There is no known way to query the state of PC pins from the BCM590xx itself; instead, the SoC&#039;s pinmux interface could be used.<br /> <br /> == See also ==<br /> <br /> * [[User:Knuxify/Old BCM590xx regulator notes|Old BCM590xx regulator notes]], very messy.</div>

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