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<a href="https://gitlab.rtems.org/ppisa">Pavel Pisa</a>
<a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1218#note_149336">commented</a>:
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<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">I agree with the formatting.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">As for the <strong style="font-weight: 600; margin-top: 0;">bsp/arm/tms570: unlock IOMM and disable interrupts before setting pins</strong>, I am not fully sure if the unlock should be included in the individual pin mode manipulation functions.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">I think that the unlock is safety related operation and if the low level pin manipulation function is called unintentionally by some bug it is better if it cannot change pin configuration. For some more dynamic system with lower security level it would be OK. But for some strict case it would be the best if the unlock setup of all pins and then lock is done during startup and there are no more places where unlocks is called which increase probability of misbehave in case of some software or even hardware error.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">So I am not sure and it has been intentional that low level manipulation functions do not include unlock. There are <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">tms570_bsp_pin_config_one()</code> and <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">tms570_bsp_pinmmr_config</code> which take care about config unlock. The <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">tms570_bsp_pinmmr_config</code> is intended for startup where interrupts are not enabled yet. When the driver is dynamic, it can use <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">tms570_bsp_pin_config_one</code> which is safe to be called at runtime.</p>
<p dir="auto" style="color: #3a383f; margin: 0;" align="initial">But I am for discussion about balance between API user friendliness and keeping as low as possible the probability that some random code execution can have some dangerous consequences.</p>
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