linux-kernel - Re: [PATCH v4 2/4] spi: spi-altera-dfl: support n5010 feature revision

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Date:   Wed, 14 Jul 2021 07:22:21 -0700
From:   Tom Rix <trix@...hat.com>
To:     Martin Hundebøll <mhu@...icom.dk>,
        Martin Hundebøll <martin@...nix.com>,
        Wu Hao <hao.wu@...el.com>, Moritz Fischer <mdf@...nel.org>,
        Xu Yilun <yilun.xu@...el.com>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Lee Jones <lee.jones@...aro.org>,
        Mark Brown <broonie@...nel.org>
Cc:     linux-fpga@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hwmon@...r.kernel.org, linux-spi@...r.kernel.org
Subject: Re: [PATCH v4 2/4] spi: spi-altera-dfl: support n5010 feature
 revision


On 7/14/21 4:33 AM, Martin Hundebøll wrote:
>
>
> On 06/07/2021 16.56, Tom Rix wrote:
>>> diff --git a/drivers/spi/spi-altera-dfl.c 
>>> b/drivers/spi/spi-altera-dfl.c
>>> index 3e32e4fe5895..f6cf7c8d9dac 100644
>>> --- a/drivers/spi/spi-altera-dfl.c
>>> +++ b/drivers/spi/spi-altera-dfl.c
>>> @@ -111,6 +111,13 @@ static struct spi_board_info m10_bmc_info = {
>>>       .chip_select = 0,
>>>   };
>>> +static struct spi_board_info m10_n5010_bmc_info = {
>>> +    .modalias = "m10-n5010",
>>> +    .max_speed_hz = 12500000,
>>> +    .bus_num = 0,
>>> +    .chip_select = 0,
>>> +};
>>
>> Other then the modalias, this is exactly the same as m10_bmc_info.
>>
>> Why not set platform_data?
>
> So like this?
>
> +static struct spi_board_info m10_n5010_bmc_info = {
> +    .platform_data = "m10-n5010",
> +    .max_speed_hz = 12500000,
> +    .bus_num = 0,
> +    .chip_select = 0,
> +};
>
> I don't see how that should improve the situation, but we might allocate
> the board info on the stack and set modalias dynamically instead?

No, I mean that instead of have two *bmc_info's generalize the existing one.

This could be done by using the as yet unused platform_data field to 
hold the identity as a bit/enum in an int.

Tom

>
> // Martin
>