linux-kernel - Re: [PATCH v6 3/6] drm: Add driver for Solomon SSD130x OLED displays

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Message-ID: <YqdZN6mtEDF2CRtS@smile.fi.intel.com>
Date:   Mon, 13 Jun 2022 18:35:19 +0300
From:   "andriy.shevchenko@...ux.intel.com" 
        <andriy.shevchenko@...ux.intel.com>
To:     Dominik Kierner <dkierner@...electronics.com>
Cc:     Javier Martinez Canillas <javierm@...hat.com>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "daniel.vetter@...ll.ch" <daniel.vetter@...ll.ch>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "geert@...ux-m68k.org" <geert@...ux-m68k.org>,
        "lee.jones@...aro.org" <lee.jones@...aro.org>,
        "linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pwm@...r.kernel.org" <linux-pwm@...r.kernel.org>,
        "maxime@...no.tech" <maxime@...no.tech>,
        "noralf@...nnes.org" <noralf@...nnes.org>,
        "sam@...nborg.org" <sam@...nborg.org>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        "tzimmermann@...e.de" <tzimmermann@...e.de>,
        "u.kleine-koenig@...gutronix.de" <u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH v6 3/6] drm: Add driver for Solomon SSD130x OLED displays

On Mon, Jun 13, 2022 at 11:39:30AM +0000, Dominik Kierner wrote:
> On 5/25/2022 21:46, Javier Martinez Canillas wrote:

...

> > Thanks, I looked at the code briefly and think that there are things there that we
> > could use. I.e the 3-wire SPI support that's in panel-solomon-ssd130x-spi-3wire.c.
> 
> When writing my driver code, I wasn't even considering using regmaps,
> like You did in Your I2C-Code. If that's applicable for 3-wire-SPI,
> it would likely be the better, more generic option. Your SPI-code
> reuses these parts to some extent. For that case,
> ssd130x_spi_regmap_config.reg_bits would need be changed to 1,
> as the "register address" has a length of 1 bit and we are sending
> 9 bits over the line and not 16.
> Since we still have 2 bytes of host memory,
> it should still be compatible with the 4-wire write, right?
> Or would 3-wire SPI require a second regmap?

I believe the cleanest solution is to have different regmap configurations.


-- 
With Best Regards,
Andy Shevchenko