linux-kernel - Re: [PATCH v10 4/9] phy: Add Tegra XUSB pad controller support

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Date:	Mon, 18 Apr 2016 13:43:18 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Andrew Bresticker <abrestic@...omium.org>,
	Kishon Vijay Abraham I <kishon@...com>,
	linux-tegra@...r.kernel.org, devicetree@...r.kernel.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v10 4/9] phy: Add Tegra XUSB pad controller support

On Fri, Mar 04, 2016 at 05:19:34PM +0100, Thierry Reding wrote:
> From: Thierry Reding <treding@...dia.com>
> 
> Add a new driver for the XUSB pad controller found on NVIDIA Tegra SoCs.
> This hardware block used to be exposed as a pin controller, but it turns
> out that this isn't a good fit. The new driver and DT binding much more
> accurately describe the hardware and are more flexible in supporting new
> SoC generations.
> 
> Signed-off-by: Thierry Reding <treding@...dia.com>
> ---
> Changes in v9:
> - export public API for direct use by the xHCI driver (replaces mailbox
>   API which had introduced a nasty circular dependency)
> 
>  drivers/phy/Kconfig                        |    2 +
>  drivers/phy/Makefile                       |    2 +
>  drivers/phy/tegra/Kconfig                  |    8 +
>  drivers/phy/tegra/Makefile                 |    5 +
>  drivers/phy/tegra/xusb-tegra124.c          | 1747 ++++++++++++++++++++++++++++
>  drivers/phy/tegra/xusb.c                   | 1017 ++++++++++++++++
>  drivers/phy/tegra/xusb.h                   |  421 +++++++
>  drivers/pinctrl/tegra/pinctrl-tegra-xusb.c |   20 +-

Hi Linus,

the changes to the existing pinctrl driver here would need an Acked-by
from you as well. Effectively this turns the pinctrl driver into library
code that is used by the PHY driver to preserve backwards-compatibility
with older bindings.

Here's the hunk that does this:

[...]
> diff --git a/drivers/pinctrl/tegra/pinctrl-tegra-xusb.c b/drivers/pinctrl/tegra/pinctrl-tegra-xusb.c
> index 2f06029c9405..946cda3fee35 100644
> --- a/drivers/pinctrl/tegra/pinctrl-tegra-xusb.c
> +++ b/drivers/pinctrl/tegra/pinctrl-tegra-xusb.c
> @@ -873,7 +873,7 @@ static const struct of_device_id tegra_xusb_padctl_of_match[] = {
>  };
>  MODULE_DEVICE_TABLE(of, tegra_xusb_padctl_of_match);
>  
> -static int tegra_xusb_padctl_probe(struct platform_device *pdev)
> +int tegra_xusb_padctl_legacy_probe(struct platform_device *pdev)
>  {
>  	struct tegra_xusb_padctl *padctl;
>  	const struct of_device_id *match;
> @@ -955,8 +955,9 @@ reset:
>  	reset_control_assert(padctl->rst);
>  	return err;
>  }
> +EXPORT_SYMBOL_GPL(tegra_xusb_padctl_legacy_probe);
>  
> -static int tegra_xusb_padctl_remove(struct platform_device *pdev)
> +int tegra_xusb_padctl_legacy_remove(struct platform_device *pdev)
>  {
>  	struct tegra_xusb_padctl *padctl = platform_get_drvdata(pdev);
>  	int err;
> @@ -969,17 +970,4 @@ static int tegra_xusb_padctl_remove(struct platform_device *pdev)
>  
>  	return err;
>  }
> -
> -static struct platform_driver tegra_xusb_padctl_driver = {
> -	.driver = {
> -		.name = "tegra-xusb-padctl",
> -		.of_match_table = tegra_xusb_padctl_of_match,
> -	},
> -	.probe = tegra_xusb_padctl_probe,
> -	.remove = tegra_xusb_padctl_remove,
> -};
> -module_platform_driver(tegra_xusb_padctl_driver);
> -
> -MODULE_AUTHOR("Thierry Reding <treding@...dia.com>");
> -MODULE_DESCRIPTION("Tegra 124 XUSB Pad Control driver");
> -MODULE_LICENSE("GPL v2");
> +EXPORT_SYMBOL_GPL(tegra_xusb_padctl_legacy_remove);

Since this merely implements the binding change, does your Acked-by on
the binding apply to this part as well?

Thanks,
Thierry

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