linux-kernel - Re: [PATCH 6/6] i2c: designware: Use PCI PSP driver for communication

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Message-ID: <Y+YfyiERB80bHE1Y@smile.fi.intel.com>
Date:   Fri, 10 Feb 2023 12:43:22 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Mario Limonciello <mario.limonciello@....com>
Cc:     Jan Dąbroś <jsd@...ihalf.com>,
        Grzegorz Bernacki <gjb@...ihalf.com>,
        Thomas Rijo-john <Rijo-john.Thomas@....com>,
        Lendacky Thomas <Thomas.Lendacky@....com>,
        herbert@...dor.apana.org.au,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        linux-i2c@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/6] i2c: designware: Use PCI PSP driver for communication

On Thu, Feb 09, 2023 at 04:38:08PM -0600, Mario Limonciello wrote:
> Currently the PSP semaphore communication base address is discovered
> by using an MSR that is not architecturally guaranteed for future
> platforms.  Also the mailbox that is utilized for communication with
> the PSP may have other consumers in the kernel, so it's better to
> make all communication go through a single driver.

...

>  #if IS_ENABLED(CONFIG_I2C_DESIGNWARE_AMDPSP)
>  int i2c_dw_amdpsp_probe_lock_support(struct dw_i2c_dev *dev);
> -void i2c_dw_amdpsp_remove_lock_support(struct dw_i2c_dev *dev);
>  #endif

...

>  #ifdef CONFIG_I2C_DESIGNWARE_AMDPSP
>  	{
>  		.probe = i2c_dw_amdpsp_probe_lock_support,
> -		.remove = i2c_dw_amdpsp_remove_lock_support,
>  	},
>  #endif

Personally I found better to have empty stub for the sake of symmetry of API.
But at the end it's not my decision, just felt that I have to express this.

-- 
With Best Regards,
Andy Shevchenko