Re: [PATCH 13/13] auxdisplay: Add HD44780 Character LCD support

From: Geert Uytterhoeven
Date: Wed Feb 08 2017 - 14:11:00 EST

Hi Andy,

On Wed, Feb 8, 2017 at 5:27 PM, Andy Shevchenko
<andy.shevchenko@xxxxxxxxx> wrote:
> On Wed, Feb 8, 2017 at 3:41 PM, Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote:
>> On Wed, Feb 8, 2017 at 2:38 PM, Andy Shevchenko
>> <andy.shevchenko@xxxxxxxxx> wrote:
>>> Btw, have you any plans to make an order among spreaded LCD drivers in
>>> kernel? Perhaps we may gather them under auxdisplay hood?
>> I have no such plan. I just had a long-standing personal interest in hd44780.
> I have one too regarding to I2C/SPI interfaced hardware.
> If you remember it was an attempt for lcd-linux to be upstreamed,
> which provides (besides i2c/spi bus drivers) those LCDs as tty
> devices.
> Also interesting feature to have.

I'm actually driving mine from SPI, using a 74HCT595 shift register and
the 74x164 GPIO driver. Should work with i2c and a PCF8574 GPIO
expander too, except that my SoC has 3.3V I/Os, while my display
needs 5V, which is taken care of by the HCT shift register.



Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

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