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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">openbmc <openbmc-bounces+vijaykhemka=fb.com@lists.ozlabs.org> on behalf of Oskar Senft <osk@google.com><br>
<b>Date: </b>Thursday, October 17, 2019 at 6:39 AM<br>
<b>To: </b>Michael Richardson <mcr@sandelman.ca><br>
<b>Cc: </b>OpenBMC Maillist <openbmc@lists.ozlabs.org><br>
<b>Subject: </b>Re: x86-power-control<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi Michael <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Why in a target system wouldn't naming it in DTS be the most reliable and<br>
most easily accessible mechanism? I can see that in development being able to define<br>
things helps, but it is not like the production systems would have wire-wrap<br>
where the GPIO pin might change.<o:p></o:p></p>
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<p class="MsoNormal">I totally agree. I was actually experimenting on our platform (TYAN S7106) to name GPIO pins in the DTS, but I couldn't figure out how to read those names from userspace.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Here's what I tried in the DTS:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">&gpio { <br>
pin_gpio_d2 {<br>
gpios = <ASPEED_GPIO(D, 2) GPIO_ACTIVE_HIGH>;<br>
input;<br>
line-name = "SYS_PWROK_BUF";<br>
};</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Courier New"">...<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Another thing here, I want to be able to map actual name defined in DTS to real name used in
<o:p></o:p></p>
<p class="MsoNormal">Power-control.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">However, from what I can tell line-name is actually only relevant when used together with "gpiohog", which is not what we want.<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">It is mainly used via libgpiod.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Did you manage to make this work?</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Thanks</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Oskar.</span><o:p></o:p></p>
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