linux-kernel - Re: [PATCH-v5 RESEND 3/5] i2c: pxa: Add support for pxa910/988 & new configuration features

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Date:	Fri, 11 Sep 2015 21:06:19 +0200
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Vaibhav Hiremath <vaibhav.hiremath@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org, robh+dt@...nel.org,
	robert.jarzmik@...e.fr, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
	"Jett.Zhou" <jtzhou@...vell.com>, Yi Zhang <yizhang@...vell.com>
Subject: Re: [PATCH-v5 RESEND 3/5] i2c: pxa: Add support for pxa910/988 & new
 configuration features

On Mon, Aug 24, 2015 at 11:29:36AM +0530, Vaibhav Hiremath wrote:
> TWSI_ILCR & TWSI_IWCR registers are used to adjust clock rate
> of standard & fast mode in pxa910/988; so this patch adds these two new
> entries to "struct pxa_reg_layout" and "struct pxa_i2c".
> 
> As discussed in the previous patch-series, the idea here is to add standard
> DT properties for ilcr and iwcr configuration fields.
> In case of Master ilcr is used for low/high time and in case of slave mode
> of operation iwcr is used for setup/hold time.

I need to rethink how to describe i2c bus timing parameters in DT in the
next days. But this is planned for 4.4., promised.

One thing I already wonder about this one...

>  static const struct platform_device_id i2c_pxa_id_table[] = {
>  	{ "pxa2xx-i2c",		REGS_PXA2XX },
>  	{ "pxa3xx-pwri2c",	REGS_PXA3XX },
>  	{ "ce4100-i2c",		REGS_CE4100 },
> +	{ "pxa910-i2c",		REGS_PXA910 },
>  	{ },

You add a new platform_id...

> @@ -1135,7 +1170,7 @@ static const struct i2c_algorithm i2c_pxa_pio_algorithm = {
>  static const struct of_device_id i2c_pxa_dt_ids[] = {
>  	{ .compatible = "mrvl,pxa-i2c", .data = (void *)REGS_PXA2XX },
>  	{ .compatible = "mrvl,pwri2c", .data = (void *)REGS_PXA3XX },
> -	{ .compatible = "mrvl,mmp-twsi", .data = (void *)REGS_PXA2XX },
> +	{ .compatible = "mrvl,mmp-twsi", .data = (void *)REGS_PXA910 },
>  	{}

...but change the compatible binding instead of adding a new one?


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