Messages in this thread | | | Subject | Re: [PATCH] soc/tegra: fuse: Add custom SoC attributes | From | Jon Hunter <> | Date | Wed, 25 Mar 2020 12:45:28 +0000 |
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On 20/03/2020 15:10, Thierry Reding wrote: > On Fri, Mar 20, 2020 at 11:37:16AM +0000, Jon Hunter wrote: >> Add a custom SoC attribute for Tegra to expose the HIDREV register >> contents to userspace via the sysfs. This register provides additional >> details about the fabrication and versioning of the device. Exposing >> this information is useful for identifying the exact device revision and >> device type. >> >> Please note that the fields in this register vary depending on the Tegra >> generation and so instead of exposing the individual fields, just expose >> the entire contents of the register. Details of the register fields can >> be found in the Technical Reference Manual for each Tegra device. > > That seems a little suboptimal to me. It's pretty trivial for the kernel > to distinguish between different SoC generations in order to know what > the fields are. It's a lot more difficult for userspace to do so. Is the > register completely different between SoC generations or just slightly?
It looks like only Tegra194 is different which is a shame. Unfortunately, does not appear to be documented in the public TRM at the moment. Hopefully we can fix that.
> Having individual fields exposed as individual attributes seems like it > would make it a lot easier for userspace to get at the needed bits.
Yes that does make sense.
Jon
-- nvpublic
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