linux-kernel - Re: [PATCH 3/3] net: phy: dp83826: add support for voltage tuning of logical levels

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: <2ead0e15-c00c-4f87-9f76-f6d329b89613@leica-geosystems.com>
Date: Thu, 11 Jan 2024 16:54:14 +0000
From: POPESCU Catalin <catalin.popescu@...ca-geosystems.com>
To: Andrew Lunn <andrew@...n.ch>
CC: "davem@...emloft.net" <davem@...emloft.net>, "edumazet@...gle.com"
	<edumazet@...gle.com>, "kuba@...nel.org" <kuba@...nel.org>,
	"pabeni@...hat.com" <pabeni@...hat.com>, "robh+dt@...nel.org"
	<robh+dt@...nel.org>, "krzysztof.kozlowski+dt@...aro.org"
	<krzysztof.kozlowski+dt@...aro.org>, "conor+dt@...nel.org"
	<conor+dt@...nel.org>, "afd@...com" <afd@...com>, "hkallweit1@...il.com"
	<hkallweit1@...il.com>, "linux@...linux.org.uk" <linux@...linux.org.uk>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	GEO-CHHER-bsp-development <bsp-development.geo@...ca-geosystems.com>
Subject: Re: [PATCH 3/3] net: phy: dp83826: add support for voltage tuning of
 logical levels

On 11.01.24 17:45, Andrew Lunn wrote:
> [You don't often get email from andrew@...n.ch. Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ]
>
> This email is not from Hexagon’s Office 365 instance. Please be careful while clicking links, opening attachments, or replying to this email.
>
>
>> +u8 dp83826_cfg_dac_minus_raw[DP83826_CFG_DAC_RAW_VALUES_MAX] = {0x38, 0x37, 0x36, 0x35, 0x34, 0x33,
>> +                                                             0x32, 0x31, 0x30, 0x2f, 0x2e, 0x2d,
>> +                                                             0x2c, 0x2b, 0x2a, 0x29, 0x28};
>> +u8 dp83826_cfg_dac_plus_raw[DP83826_CFG_DAC_RAW_VALUES_MAX] = {0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d,
>> +                                                            0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13,
>> +                                                            0x14, 0x15, 0x16, 0x17, 0x18};
> Both of these should be static const.
Indeed.
>
> However, they appear pointless. Plus is just a shift. minus is some
> simple arithmetic and a shift.
Well, I found it more clear to use a bit of memory than adding 
instructions to compute some raw values from other raw values used as 
reference.
>
>         Andrew