linux-kernel - Re: [PATCH] i2c/busses: Add i2c-icy for I2C on m68k/Amiga

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Message-ID: <CAMuHMdUum4Dubx8EOsSakaNfLp4-Yyzsutfkvb_+i5mqtOtkKw@mail.gmail.com>
Date:   Mon, 12 Aug 2019 13:07:25 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Max Staudt <max@...as.org>
Cc:     Linux I2C <linux-i2c@...r.kernel.org>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        "Linux/m68k" <linux-m68k@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>
Subject: Re: [PATCH] i2c/busses: Add i2c-icy for I2C on m68k/Amiga

Hi Max,

On Mon, Aug 12, 2019 at 12:43 PM Max Staudt <max@...as.org> wrote:
> On 08/12/2019 11:37 AM, Geert Uytterhoeven wrote:
> >> +       /*
> >> +        * The 2019 a1k.org PCBs have an LTC2990 at 0x4c, so start
> >> +        * it automatically once ltc2990 is modprobed.
> >> +        *
> >> +        * in0 is the voltage of the internal 5V power supply.
> >> +        * temp1 is the temperature inside the chip.
> >> +        *
> >> +        * Configuration 0x18 enables all sensors on this PCB:
> >> +        *  # modprobe i2c-dev
> >> +        *  # i2cset 0 0x4c 1 0x18
> >
> > What's the reason for the i2cset command?
>
> It sets the sensor modes in the LTC2990 and enables the three sensors listed below. I should have clarified this.
>
> I tried to integrate this in the driver, but ltc2990 only allows reading this configuration out of a device tree. Is there a good way to fake a DT entry in the init function?

You can add platform_data support to the ltc2990 driver, and pass it
through i2c_board_info.platform_data.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds