linux-kernel - Re: [PATCH v6 01/10] i3c: Add core I3C infrastructure

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Date:   Wed, 22 Aug 2018 17:43:34 +0100
From:   vitor <Vitor.Soares@...opsys.com>
To:     Boris Brezillon <boris.brezillon@...tlin.com>,
        Wolfram Sang <wsa@...-dreams.de>, <linux-i2c@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>, <linux-doc@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>
CC:     Przemyslaw Sroka <psroka@...ence.com>,
        Arkadiusz Golec <agolec@...ence.com>,
        Alan Douglas <adouglas@...ence.com>,
        Bartosz Folta <bfolta@...ence.com>,
        Damian Kos <dkos@...ence.com>,
        Alicja Jurasik-Urbaniak <alicja@...ence.com>,
        Cyprian Wronka <cwronka@...ence.com>,
        Suresh Punnoose <sureshp@...ence.com>,
        Rafal Ciepiela <rafalc@...ence.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Nishanth Menon <nm@...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>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Vitor Soares <Vitor.Soares@...opsys.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Xiang Lin <Xiang.Lin@...aptics.com>,
        <linux-gpio@...r.kernel.org>, Sekhar Nori <nsekhar@...com>,
        Przemyslaw Gaj <pgaj@...ence.com>,
        Peter Rosin <peda@...ntia.se>
Subject: Re: [PATCH v6 01/10] i3c: Add core I3C infrastructure

Hi Boris,


On 19-07-2018 16:29, Boris Brezillon wrote:
> +int i3c_bus_register(struct i3c_bus *i3cbus)
> +{
> +	struct i2c_dev_desc *desc;
> +
> +	i3c_bus_for_each_i2cdev(i3cbus, desc) {
> +		switch (desc->boardinfo->lvr & I3C_LVR_I2C_INDEX_MASK) {
> +		case I3C_LVR_I2C_INDEX(0):
> +			if (i3cbus->mode < I3C_BUS_MODE_MIXED_FAST)
> +				i3cbus->mode = I3C_BUS_MODE_MIXED_FAST;
> +			break;
> +
> +		case I3C_LVR_I2C_INDEX(1):
> +		case I3C_LVR_I2C_INDEX(2):
> +			if (i3cbus->mode < I3C_BUS_MODE_MIXED_SLOW)
> +				i3cbus->mode = I3C_BUS_MODE_MIXED_SLOW;
> +			break;
> +
> +		default:
> +			return -EINVAL;
> +		}
> +	}
> +
> +	if (!i3cbus->scl_rate.i3c)
> +		i3cbus->scl_rate.i3c = I3C_BUS_TYP_I3C_SCL_RATE;
> +
> +	if (!i3cbus->scl_rate.i2c) {
> +		if (i3cbus->mode == I3C_BUS_MODE_MIXED_SLOW)
> +			i3cbus->scl_rate.i2c = I3C_BUS_I2C_FM_SCL_RATE;
> +		else
> +			i3cbus->scl_rate.i2c = I3C_BUS_I2C_FM_PLUS_SCL_RATE;
> +	}
> +
> +	/*
> +	 * I3C/I2C frequency may have been overridden, check that user-provided
> +	 * values are not exceeding max possible frequency.
> +	 */
> +	if (i3cbus->scl_rate.i3c > I3C_BUS_MAX_I3C_SCL_RATE ||
> +	    i3cbus->scl_rate.i2c > I3C_BUS_I2C_FM_PLUS_SCL_RATE) {
> +		return -EINVAL;
> +	}
> +
> +	dev_set_name(&i3cbus->dev, "i3c-%d", i3cbus->id);
> +
> +	return device_add(&i3cbus->dev);
> +}
During the tests of the bus with i2c devices I found the i2c_dev_desc 
objects aren't allocated before this function. This cause i3cbus->mode = 
I3C_BUS_MODE_PURE.

I want to do something for the slave and secondary master, do you 
already have infrastructure that you can share?


Best regards,
Vitor Soares