linux-kernel - Re: [PATCH v2] i2c: tegra: Add i2c support

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Message-ID: <AANLkTi=ia1FGur6mrVuE2rOBGjjRYZ3A41mTq3qOowmS@mail.gmail.com>
Date:	Sun, 20 Feb 2011 20:37:29 -0800
From:	Olof Johansson <olof@...om.net>
To:	Colin Cross <ccross@...roid.com>
Cc:	Ben Dooks <ben-i2c@...ff.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Ben Dooks <ben-linux@...ff.org>, linux-i2c@...r.kernel.org,
	swarren@...dia.com, patches@...nsource.wolfsonmicro.com,
	linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] i2c: tegra: Add i2c support

Hi,

Just a couple of minor nits. I wouldn't worry about respinning just
for these comments, but if you end up doing it for other feedback, see
below.


-Olof

On Sun, Feb 20, 2011 at 5:14 PM, Colin Cross <ccross@...roid.com> wrote:

> diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
> new file mode 100644
> index 0000000..3921f66
> --- /dev/null
> +++ b/drivers/i2c/busses/i2c-tegra.c
> @@ -0,0 +1,700 @@
> +/*
> + * drivers/i2c/busses/i2c-tegra.c
> + *
> + * Copyright (C) 2010 Google, Inc.

2011?

[..]

> +/*
> + * i2c_writel and i2c_readl will offset the register if necessary to talk
> + * to the I2C block inside the DVC block
> + */
> +static unsigned long tegra_i2c_reg_addr(struct tegra_i2c_dev *i2c_dev,
> +       unsigned long reg)
> +{
> +       if (i2c_dev->is_dvc)
> +               reg += (reg >= I2C_TX_FIFO) ? 0x10 : 0x40;
> +       return reg;
> +}
> +
> +static void i2c_writel(struct tegra_i2c_dev *i2c_dev, u32 val,
> +       unsigned long reg)
> +{
> +       writel(val, i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg));
> +}
> +
> +static u32 i2c_readl(struct tegra_i2c_dev *i2c_dev, unsigned long reg)
> +{
> +       return readl(i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg));
> +}
> +
> +static void i2c_writesl(struct tegra_i2c_dev *i2c_dev, void *data,
> +       unsigned long reg, int len)
> +{
> +       writesl(i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg), data, len);
> +}
> +
> +static void i2c_readsl(struct tegra_i2c_dev *i2c_dev, void *data,
> +       unsigned long reg, int len)
> +{
> +       readsl(i2c_dev->base + tegra_i2c_reg_addr(i2c_dev, reg), data, len);
> +}


All of the above pass in i2c_dev to tegra_i2c_reg_addr, might as well
do the base addition in there.

> diff --git a/include/linux/i2c-tegra.h b/include/linux/i2c-tegra.h
> new file mode 100644
> index 0000000..9c85da4
> --- /dev/null
> +++ b/include/linux/i2c-tegra.h
> @@ -0,0 +1,25 @@
> +/*
> + * drivers/i2c/busses/i2c-tegra.c
> + *
> + * Copyright (C) 2010 Google, Inc.

2011?
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