linux-kernel - Re: [PATCH v3 1/2] usb: ehci-exynos: Make provision for vdd regulators

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Message-ID: <CAJKOXPeccCOBd6-jMJSZVtNMR82EUztZexqv1qParC9ad=YOtA@mail.gmail.com>
Date:	Sun, 31 May 2015 15:34:31 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Vivek Gautam <gautam.vivek@...sung.com>
Cc:	linux-usb@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	gregkh@...uxfoundation.org, Jingoo Han <jg1.han@...sung.com>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [PATCH v3 1/2] usb: ehci-exynos: Make provision for vdd regulators

2014-06-25 21:42 GMT+09:00 Vivek Gautam <gautam.vivek@...sung.com>:
> Facilitate getting required 3.3V and 1.0V VDD supply for
> EHCI controller on Exynos.
>
> With the patches for regulators' nodes merged in 3.15:
> c8c253f ARM: dts: Add regulator entries to smdk5420
> 275dcd2 ARM: dts: add max77686 pmic node for smdk5250,
> the exynos systems turn on only minimal number of regulators.
>
> Until now, the VDD regulator supplies were either turned on
> by the bootloader, or the regulators were enabled by default
> in the kernel, so that the controller drivers did not need to
> care about turning on these regulators on their own.
> This was rather bad about these controller drivers.
> So ensuring now that the controller driver requests the necessary
> VDD regulators (if available, unless there are direct VDD rails),
> and enable them so as to make them working.
>
> Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>
> Cc: Jingoo Han <jg1.han@...sung.com>
> Cc: Alan Stern <stern@...land.harvard.edu>
> ---
>
> Changes from v2:
>  - replaced devm_regulator_get() with devm_regulator_get_optional().
>  - Added Documentation for the vdd supplies for the controller.
>  - Re-did the commit message.

The patch looks useful but it seems it was forgotten. Do you have any
plans to resend it?

Best regards,
Krzysztof
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