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[2003:e4:1f0f:a600:f22f:74ff:fe1f:3a53]) by smtp.gmail.com with ESMTPSA id u30-20020a50951e000000b0054ca7afdf35sm8257006eda.86.2023.12.15.08.43.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Dec 2023 08:43:41 -0800 (PST) Date: Fri, 15 Dec 2023 17:43:39 +0100 From: Thierry Reding To: Kartik , Arnd Bergmann Cc: Jon Hunter , Kees Cook , Andy Shevchenko , Andrew Morton , Ulf Hansson , Linus Walleij , pshete@nvidia.com, petlozup@nvidia.com, Yangtao Li , Rob Herring , stefank@nvidia.com, pdeschrijver@nvidia.com, Christophe JAILLET , linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v7 0/8] soc/tegra: fuse: Add ACPI support Message-ID: References: <20231017052322.2636-1-kkartik@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="w4dYamGUEkjnuhl6" Content-Disposition: inline In-Reply-To: User-Agent: Mutt/2.2.12 (2023-09-09) --w4dYamGUEkjnuhl6 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Dec 14, 2023 at 06:43:47PM +0000, Arnd Bergmann wrote: > On Thu, Dec 14, 2023, at 17:08, Thierry Reding wrote: > > On Tue, Oct 17, 2023 at 10:53:14AM +0530, Kartik wrote: > >> This series of patches add ACPI support for Tegra194 and Tegra234 in > >> Tegra fuse and apbmisc drivers. It also adds support for Tegra241 > >> which uses ACPI boot. > > > > Applied, thanks. >=20 > I'm still a bit puzzled by this series, can you provide some more backgro= und? >=20 > Why does an ACPI based system require access to SoC drivers? Shouldn't > this all be abstracted by the BIOS in some form so the device drivers > can work standalone rather than calling into this driver? This driver exposes a couple of things such as SoC family and SKU information that is not otherwise available. It also exposes FUSE data which can be used to calibrate certain devices. Most of the region that contains the fuses is in the keep-out, so perhaps they aren't needed on Tegra241. I suppose things like SoC family and such could be exposed differently. Not sure if ACPI has other ways to expose that. Let's see if Kartik can shed some light on this. 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