linux-kernel - Re: [PATCH v5 17/17] serial: 8250: Add 8250

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <ZjTtx88zk4GvCImk@sunil-laptop>
Date: Fri, 3 May 2024 19:29:35 +0530
From: Sunil V L <sunilvl@...tanamicro.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org, linux-acpi@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-serial@...r.kernel.org,
	acpica-devel@...ts.linux.dev,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Len Brown <lenb@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Anup Patel <anup@...infault.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Samuel Holland <samuel.holland@...ive.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>,
	Robert Moore <robert.moore@...el.com>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Andrew Jones <ajones@...tanamicro.com>,
	Marc Zyngier <maz@...nel.org>,
	Atish Kumar Patra <atishp@...osinc.com>,
	Andrei Warkentin <andrei.warkentin@...el.com>,
	Haibo1 Xu <haibo1.xu@...el.com>,
	Björn Töpel <bjorn@...nel.org>
Subject: Re: [PATCH v5 17/17] serial: 8250: Add 8250_acpi driver

On Thu, May 02, 2024 at 06:35:52PM +0300, Andy Shevchenko wrote:
> On Thu, May 02, 2024 at 04:50:57PM +0530, Sunil V L wrote:
> > On Thu, May 02, 2024 at 01:09:57PM +0300, Andy Shevchenko wrote:
> > > On Thu, May 02, 2024 at 03:20:08PM +0530, Sunil V L wrote:
> > > > On Thu, May 02, 2024 at 12:17:59PM +0300, Andy Shevchenko wrote:
> 
> ...
> 
> > > > This driver is not a duplicate of 8250_pnp. It just relies on UART
> > > > enumerated as platform device instead of using PNP interfaces.
> > > > Isn't it better and simple to have an option to enumerate as platform
> > > > device instead of PNP? 
> > > 
> > > Ah, then extract platform driver first from 8250_core.c.
> > > 
> > Let me know if I understand your suggestion correctly. Do you mean call
> > something like serial8250_acpi_init() from serial8250_init() and
> > register the driver directly in serial8250_acpi_init()?
> 
> Extract the code to be 8250_platform.c and update that file.
> I have locally the extraction of RSA code, I will see if I can help you
> with the rest.
> 
Thanks!. That will be helpful. TBH, I don't understand what to do for
extracting the platform driver code. There are already several vendor
specific UART drivers (ex: 8250_fsl.c) which are enumerated as platform
devices. 8250_core.c looks cleanly supporting such drivers which can
register themselves with the core. For generic UART, DT has 8250_of.c
and ACPI has 8250_pnp.c. But 8250_pnp.c comes with baggage of PNP
contract. So, the driver in this patch is similar to vendor specific
drivers to support generic uart devices which are enumerated as platform
device. I can rename 8250_acpi.c to 8250_platform.c if that is better.

Could you please help with a patch even if not compiled so that I can
understand your suggestion better? 

Thanks for your help!
Sunil