linux-kernel - Re: [PATCH v2 1/4] i2c: tegra: implement slave mode

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Date:	Fri, 3 Apr 2015 21:46:26 +0200
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Andrey Danin <danindrey@...l.ru>
Cc:	devicetree@...r.kernel.org, linux-i2c@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-tegra@...r.kernel.org,
	linux-kernel@...r.kernel.org, ac100@...ts.launchpad.net,
	Laxman Dewangan <ldewangan@...dia.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Alexandre Courbot <gnurou@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Julian Andres Klode <jak@...-linux.org>,
	Marc Dietrich <marvin24@....de>
Subject: Re: [PATCH v2 1/4] i2c: tegra: implement slave mode

> +static void tegra_i2c_slave_write(struct tegra_i2c_dev *i2c_dev, u32 val)
> +{
> +	i2c_writel(i2c_dev, val, I2C_SL_RCVD);
> +
> +	/*
> +	 * TODO: A correct fix needs to be found for this.
> +	 *
> +	 * We experience less incomplete messages with this delay than without
> +	 * it, but we don't know why. Help is appreciated.
> +	 */

Uh oh. So I assume this is another reason for staging?

> +	if (!i2c_dev->slave || !i2c_dev->slave->slave_cb)
> +		return -EINVAL;

The core checks for slave_cb being valid.

> +		i2c_slave_event(i2c_dev->slave, I2C_SLAVE_STOP, &dummy);

You could use value here, too, or?

> +	if (!tegra_i2c_slave_isr(irq, i2c_dev))
> +		return IRQ_HANDLED;

Minor nit: I'd prefer == 0 here, since it reads "if not slave_isr return
handled".

> +	if (slave->addr > 0x7F)
> +		addr2 = (slave->addr >> 7) | I2C_SL_ADDR2_TEN_BIT_MODE;

Nope. There are 10 bit encodings of addresses 0x000-0x07f, too. So, you
need to check for the flag (slave->flags & I2C_CLIENT_TEN).


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