linux-kernel - Re: [PATCH v4 05/11] i2c: riic: Add suspend/resume support

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Message-ID: <ajj4fwoob5wq5guktq2b54h55fn5qlcakiybq6pk3xagiops7d@abpwevzemidy>
Date: Mon, 19 Aug 2024 21:37:44 +0200
From: Andi Shyti <andi.shyti@...nel.org>
To: Claudiu <claudiu.beznea@...on.dev>
Cc: chris.brandt@...esas.com, robh@...nel.org, krzk+dt@...nel.org, 
	conor+dt@...nel.org, geert+renesas@...der.be, magnus.damm@...il.com, 
	p.zabel@...gutronix.de, wsa+renesas@...g-engineering.com, 
	linux-renesas-soc@...r.kernel.org, linux-i2c@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH v4 05/11] i2c: riic: Add suspend/resume support

Hi Claudiu,

On Mon, Aug 19, 2024 at 01:23:42PM GMT, Claudiu wrote:
> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> 
> Add suspend/resume support for the RIIC driver. This is necessary for the
> Renesas RZ/G3S SoC which support suspend to deep sleep state where power
> to most of the SoC components is turned off. As a result the I2C controller
> needs to be reconfigured after suspend/resume. For this, the reset line
> was stored in the driver private data structure as well as i2c timings.
> The reset line and I2C timings are necessary to re-initialize the
> controller after resume.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

This patch doesn't have tags, so I'll add mine :-)

Reviewed-by: Andi Shyti <andi.shyti@...nel.org> 

Just one thing, though...

...

> +static int riic_i2c_resume(struct device *dev)
> +{
> +	struct riic_dev *riic = dev_get_drvdata(dev);
> +	int ret;
> +
> +	ret = reset_control_deassert(riic->rstc);
> +	if (ret)
> +		return ret;
> +
> +	ret = riic_init_hw(riic);
> +	if (ret) {
> +		reset_control_assert(riic->rstc);
> +		return ret;

Can I add a comment here saying:

	/*
	 * Since the driver remains loaded after resume,
	 * we want the reset line to be asserted.
	 */
	reset_control_assert(riic->rstc);

Unless I missed the point :-)

Thanks,
Andi