linux-kernel - Re: [PATCH 1/2] i2c: pxa: migrate to new i2c

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Message-ID: <20191001162913.GR32742@smile.fi.intel.com>
Date:   Tue, 1 Oct 2019 19:29:13 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Patrick Williams <alpawi@...zon.com>
Cc:     Patrick Williams <patrick@...cx.xyz>,
        Wolfram Sang <wsa@...-dreams.de>,
        Jean Delvare <jdelvare@...e.de>,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Max Staudt <max@...as.org>,
        Juergen Fitschen <jfi@...-embedded.de>,
        Elie Morisse <syniurge@...il.com>,
        Ajay Gupta <ajayg@...dia.com>, Stefan Roese <sr@...x.de>,
        Florian Fainelli <f.fainelli@...il.com>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Baolin Wang <baolin.wang@...aro.org>,
        Paul Cercueil <paul@...pouillou.net>,
        Enrico Weigelt <info@...ux.net>,
        Allison Randal <allison@...utok.net>,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] i2c: pxa: migrate to new i2c_slave APIs



On Tue, Oct 01, 2019 at 10:59:59AM -0500, Patrick Williams wrote:
> The i2c subsystem was enhanced circa 2015 to support operating as
> an i2c-slave device.  Prior to that, the i2c-pxa driver supported
> an i2c-slave but had its own APIs.  There are no existing in-kernel
> drivers or platforms that utilize the i2c-pxa APIs.
> 
> Migrate the i2c-pxa driver to the general i2c-slave APIs so that
> existing drivers, such as the i2c-slave-eeprom, can be used.
> 
> This has been tested with a Marvell EspressoBin, using i2c-pxa and
> i2c-slave-eeprom, acting as a slave, and a RaspeberryPi 3, using the
> at24 driver, acting as a master.

There are quite a few people in the Cc list. I'm not sure they all are
interested in this. I deliberately dropped few names, sorry, if I was mistaken.

> +		if (isr & ISR_RWM) {
> +			u8 byte = 0;
> +
> +			i2c_slave_event(i2c->slave, I2C_SLAVE_READ_REQUESTED,
> +					&byte);
> +			writel(byte, _IDBR(i2c));
> +		} else {
> +			i2c_slave_event(i2c->slave, I2C_SLAVE_WRITE_REQUESTED,
> +					NULL);
> +		}

Hmm... Perhaps

		u8 byte = 0;

		i2c_slave_event(i2c->slave, I2C_SLAVE_READ_REQUESTED, &byte);
		if (isr & ISR_RWM)
			writel(byte, _IDBR(i2c));

-- 
With Best Regards,
Andy Shevchenko