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From: Max Staudt <max@enpas.org>
To: Wolfram Sang <wsa@the-dreams.de>
Cc: linux-i2c@vger.kernel.org, linux-hwmon@vger.kernel.org,
	Wolfram Sang <wsa+renesas@sang-engineering.com>,
	Jean Delvare <jdelvare@suse.com>,
	Guenter Roeck <linux@roeck-us.net>,
	linux-m68k@vger.kernel.org, linux-kernel@vger.kernel.org,
	glaubitz@physik.fu-berlin.de
Subject: Re: [PATCH v2 1/4] i2c/busses: Add i2c-icy for I2C on m68k/Amiga
Date: Thu, 15 Aug 2019 14:10:56 +0200	[thread overview]
Message-ID: <4661d2f3-13e1-ff62-22e1-e4391ccc38b2@enpas.org> (raw)
In-Reply-To: <20190815120430.GB1916@kunai>

On 08/15/2019 02:04 PM, Wolfram Sang wrote:
>>   When the PCF8584 is addressed as slave, this register
>>   must be loaded with the 7-bit I 2 C-bus address to which the
>>   PCF8584 is to respond. During initialization, the own
>>   address register S0' must be written to, regardless
>>   whether it is later used.
> 
> I see. It must be written a non-zero value to leave the monitor mode.
> But this really needs no callback, we can hardcode any non-zero value.
> If slave support is (ever) to be implemented, the own address will come
> from the I2C core.
The callback, just like getclock(), is from the existing i2c-algo-pcf, which I don't want to touch right now. So I'm afraid it has to stay, even if it returns a fixed number.

Touching or forking i2c-algo-pcf will be necessary in order to implement IRQ support, if I ever get around to it. I've wasted too much time on debugging IRQ support, and would rather do it another time, if ever ;)
I've left a comment block at the start of i2c-icy.c for anyone interested in the gory details.


If this is okay with you, I'll send another round of patches. :)


Thanks!

Max

  reply	other threads:[~2019-08-15 12:11 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-12 23:52 [PATCH v2 1/4] i2c/busses: Add i2c-icy for I2C on m68k/Amiga Max Staudt
2019-08-12 23:52 ` [PATCH v2 2/4] i2c/busses/i2c-icy: Add LTC2990 present on 2019 board revision Max Staudt
2019-08-13  7:03   ` Geert Uytterhoeven
2019-08-13  9:49     ` Max Staudt
2019-08-14 19:52       ` Wolfram Sang
2019-08-12 23:52 ` [PATCH v2 3/4] hwmon/ltc2990: Add platform_data support Max Staudt
2019-08-13  6:59   ` Geert Uytterhoeven
2019-08-13  8:02   ` Guenter Roeck
2019-08-13  8:27     ` Geert Uytterhoeven
2019-08-13 13:27       ` Guenter Roeck
2019-08-13 13:32         ` Geert Uytterhoeven
2019-08-13 10:10     ` Max Staudt
2019-08-13 13:24       ` Guenter Roeck
2019-08-13 13:31         ` Max
2019-08-14 18:11         ` Max Staudt
2019-08-12 23:52 ` [PATCH v2 4/4] i2c/busses/i2c-icy: Add platform_data for LTC2990 Max Staudt
2019-08-13  7:04   ` Geert Uytterhoeven
2019-08-13  7:08 ` [PATCH v2 1/4] i2c/busses: Add i2c-icy for I2C on m68k/Amiga Geert Uytterhoeven
2019-08-13  9:50   ` Max Staudt
2019-08-14 19:47 ` Wolfram Sang
2019-08-14 22:33   ` Max Staudt
2019-08-15  7:12     ` Wolfram Sang
2019-08-15 10:00       ` Max Staudt
2019-08-15 11:48         ` Wolfram Sang
2019-08-15 11:52           ` Max
2019-08-15 12:04             ` Wolfram Sang
2019-08-15 12:10               ` Max Staudt [this message]
2019-08-15 12:52                 ` Wolfram Sang

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