linux-kernel - Re: [PATCH v3 1/5] i2c: xiic: make the clock optional

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Message-ID: <aXMxVK5nGjeO1wGX@smile.fi.intel.com>
Date: Fri, 23 Jan 2026 10:29:08 +0200
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: abdurrahman@...thop.ai
Cc: Michal Simek <michal.simek@....com>, Andi Shyti <andi.shyti@...nel.org>,
	linux-arm-kernel@...ts.infradead.org, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/5] i2c: xiic: make the clock optional

On Fri, Jan 23, 2026 at 08:02:44AM +0000, Abdurrahman Hussain via B4 Relay wrote:

> The xiic driver is designed to operate without explicit clock configuration
> when clocks are not specified in the firmware. This functionality is
> already implemented in xiic_setclk(), which performs an early return when
> either i2c_clk or input_clk are zero:
> 
> This condition is satisfied when clocks are missing, as clk_get_rate(NULL)
> returns zero, allowing the driver to rely on hardware-configured timing.

...

>  	mutex_init(&i2c->lock);
>  	spin_lock_init(&i2c->atomic_lock);
>  
> -	i2c->clk = devm_clk_get_enabled(&pdev->dev, NULL);
> +	i2c->clk = devm_clk_get_optional_enabled(&pdev->dev, NULL);

You also need to have

	struct device *dev = &pdev->dev;

in *this* patch.

>  	if (IS_ERR(i2c->clk))
>  		return dev_err_probe(&pdev->dev, PTR_ERR(i2c->clk),
>  				     "failed to enable input clock.\n");

-- 
With Best Regards,
Andy Shevchenko