Hi Wolfram,
On Wed, Jan 6, 2016 at 2:51 PM, Wolfram Sang <wsa@xxxxxxxxxxxxx> wrote:
> From: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
>
> This driver allows an I2C bus to switch between multiple masters. This
> is not hot-swichting because connected I2C slaves will be
switching
> re-instantiated. It is meant to select the best I2C core at runtime once
> the task is known. Example: Prefer i2c-gpio over another I2C core
> because of HW errata affetcing your use case.
affecting
> --- /dev/null
> +++ b/drivers/i2c/muxes/i2c-demux-pinctrl.c
> @@ -0,0 +1,276 @@
> +/*
> + * Pinctrl based I2C DeMultiplexer
> + *
> + * Copyright (C) 2015-16 by Wolfram Sang, Sang Engineering <wsa@xxxxxxxxxxxxxxxxxxxx>
> + * Copyright (C) 2015-16 by Renesas Electronics Corporation
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; version 2 of the License.
> + *
> + * See the bindings doc for DTS setup.
> + */
> +
> +#include <linux/i2c.h>
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of.h>
> +#include <linux/pinctrl/consumer.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +#include <linux/sysfs.h>
> +
> +struct i2c_demux_pinctrl_chan {
> + struct device_node *parent_np;
> + struct i2c_adapter *parent_adap;
> + struct of_changeset chgset;
> +};
> +
> +struct i2c_demux_pinctrl_priv {
> + int cur_chan;
> + int num_chan;
This is always positive, so you can make num_chan and a few loop counters
unsigned.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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