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

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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"
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	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:
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>> +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