linux-kernel - Re: [PATCH 1/3] i2c: Add Device Tree support to the Nomadik I2C driver

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Date:	Thu, 14 Jun 2012 19:12:14 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linus.walleij@...ricsson.com, arnd@...db.de,
	grant.likely@...retlab.ca, linux-i2c@...r.kernel.org
Subject: Re: [PATCH 1/3] i2c: Add Device Tree support to the Nomadik I2C driver

On Wed, Jun 13, 2012 at 6:07 PM, Lee Jones <lee.jones@...aro.org> wrote:

> Here we apply the bindings required for successful Device Tree
> probing of the i2c-nomadik driver. We also apply a fall-back
> configuration in case either one is not provided, or a required
> element is missing from the one supplied.
>
> Cc: linux-i2c@...r.kernel.org
> Signed-off-by: Lee Jones <lee.jones@...aro.org>

This looks more like I'd expect it, good job! :-D

> +static int __devinit
> +nmk_i2c_of_probe(struct device_node *np, struct nmk_i2c_controller *pdata)
> +{
> +       of_property_read_u32(np, "clock-frequency", (u32*)&pdata->clk_freq);
> +       if (!pdata->clk_freq) {
> +               pr_warn("%s: Clock frequency not found\n", np->full_name);
> +               return -EINVAL;
> +       }
> +
> +       of_property_read_u32(np, "stericsson,slsu", (u32*)&pdata->slsu);
> +       if (!pdata->slsu) {
> +               pr_warn("%s: Data line delay not found\n", np->full_name);
> +               return -EINVAL;
> +       }
> +
> +       of_property_read_u32(np, "stericsson,tft", (u32*)&pdata->tft);
> +       if (!pdata->tft) {
> +               pr_warn("%s: Tx FIFO threshold not found\n", np->full_name);
> +               return -EINVAL;
> +       }
> +
> +       of_property_read_u32(np, "stericsson,rft", (u32*)&pdata->rft);
> +       if (!pdata->rft) {
> +               pr_warn("%s: Rx FIFO threshold not found\n", np->full_name);
> +               return -EINVAL;
> +       }
> +
> +       of_property_read_u32(np, "stericsson,timeout", (u32*)&pdata->timeout);
> +       if (!pdata->timeout) {
> +               pr_warn("%s: Timeout not found\n", np->full_name);
> +               return -EINVAL;
> +       }
> +
> +       if (of_get_property(np, "stericsson,i2c_freq_mode_fast", NULL))
> +               pdata->sm = I2C_FREQ_MODE_FAST;
> +       else
> +               pdata->sm = I2C_FREQ_MODE_STANDARD;
> +
> +       return 0;
> +}

Will this compile fine if CONFIG_OF is not selected?

>        /* fetch the controller configuration from machine */
>        dev->cfg.clk_freq = pdata->clk_freq;
> -       dev->cfg.slsu   = pdata->slsu;
> -       dev->cfg.tft    = pdata->tft;
> -       dev->cfg.rft    = pdata->rft;
> -       dev->cfg.sm     = pdata->sm;
> -
> -       i2c_set_adapdata(adap, dev);
> +       dev->cfg.slsu     = pdata->slsu;
> +       dev->cfg.tft      = pdata->tft;
> +       dev->cfg.rft      = pdata->rft;
> +       dev->cfg.sm       = pdata->sm;  i2c_set_adapdata(adap, dev);

This looks like an unrelated whitespace fix, but OK...

Yours,
Linus Walleij
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