linux-kernel - Re: [PATCH v6 07/15] phy: tegra: xusb: Add sleepwalk and suspend/resume

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Message-ID: <YAbksocGBUShr1lP@ulmo>
Date:   Tue, 19 Jan 2021 14:54:58 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     JC Kuo <jckuo@...dia.com>
Cc:     gregkh@...uxfoundation.org, robh@...nel.org, jonathanh@...dia.com,
        kishon@...com, linux-tegra@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, nkristam@...dia.com
Subject: Re: [PATCH v6 07/15] phy: tegra: xusb: Add sleepwalk and
 suspend/resume

On Tue, Jan 19, 2021 at 04:55:38PM +0800, JC Kuo wrote:
> This commit adds sleepwalk/wake and suspend/resume interfaces
> to Tegra XUSB PHY driver.
> 
> Tegra XUSB host controller driver makes use of sleepwalk functions
> to enable/disable sleepwalk circuit which is in always-on partition
> and can respond to USB resume signals when controller is not powered.
> Sleepwalk can be enabled/disabled for any USB UPHY individually.
> 
>   - tegra_xusb_padctl_enable_phy_sleepwalk()
>   - tegra_xusb_padctl_disable_phy_sleepwalk()
> 
> Tegra XUSB host controller driver makes use of wake functions to
> enable/disable/query wake circuit which is in always-on partition
> can wake system up when USB resume happens.
> Wake circuit can be enabled/disabled for any USB PHY individually.
> 
>   - tegra_xusb_padctl_enable_phy_wake()
>   - tegra_xusb_padctl_disable_phy_wake()
>   - tegra_xusb_padctl_remote_wake_detected()
> 
> This commit also adds two system suspend stubs that can be used to
> save and restore XUSB PADCTL context during system suspend and
> resume.
>   - tegra_xusb_padctl_suspend_noirq()
>   - tegra_xusb_padctl_resume_noirq()
> 
> Signed-off-by: JC Kuo <jckuo@...dia.com>
> ---
> v6:
>    no change
> v5:
>    no change
> v4:
>    move sleepwalk/wake stubs from 'struct tegra_xusb_padctl_ops' to
>    'struct tegra_xusb_lane_ops'
> v3:
>    commit message improvement, no change in code
> 
>  drivers/phy/tegra/xusb.c       | 82 ++++++++++++++++++++++++++++++++++
>  drivers/phy/tegra/xusb.h       |  8 ++++
>  include/linux/phy/tegra/xusb.h | 10 ++++-
>  3 files changed, 99 insertions(+), 1 deletion(-)

Acked-by: Thierry Reding <treding@...dia.com>

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