linux-kernel - Re: [PATCH v7 6/6] i2c: designware: Add doorbell support for Mendocino

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Message-ID: <b6d72005-5c5e-2716-1e6c-5d4e2ce3e60a@linux.intel.com>
Date:   Fri, 31 Mar 2023 14:55:53 +0300
From:   Jarkko Nikula <jarkko.nikula@...ux.intel.com>
To:     Mario Limonciello <mario.limonciello@....com>,
        Jan Dąbroś <jsd@...ihalf.com>,
        Grzegorz Bernacki <gjb@...ihalf.com>,
        Mark Hasemeyer <markhas@...omium.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:     Felix Held <Felix.Held@....com>, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 6/6] i2c: designware: Add doorbell support for
 Mendocino

On 3/30/23 01:07, Mario Limonciello wrote:
> Mendocino and later platform don't use the platform feature mailbox for
> communication for I2C arbitration, they rely upon ringing a doorbell.
> 
> Detect the platform by the device ID of the root port and choose the
> appropriate method.
> 
> Link: https://lore.kernel.org/linux-i2c/20220916131854.687371-3-jsd@semihalf.com/
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
> ---
> v6->v7:
>   * Add missing pci_dev_put()
>   * s/mendocino/doorbell/
> v5->v6:
>   * Handle Mendocino busy code like Cezanne
> v4->v5:
>   * Poll for busy
>   * Rename to mendocino
>   * Add explicit dependency on PCI
> v3->v4:
>   * Adjust to use PCI device ID and function pointers instead
> v2->v3:
>   * Use CPU ID rather than ACPI ID, this will be pushed to a later patch
> v1->v2:
>   * New patch
> ---
>   drivers/i2c/busses/Kconfig                 |  1 +
>   drivers/i2c/busses/i2c-designware-amdpsp.c | 26 +++++++++++++++++++++-
>   2 files changed, 26 insertions(+), 1 deletion(-)
> 
Acked-by: Jarkko Nikula <jarkko.nikula@...ux.intel.com>