From: Felipe Balbi <felipe.balbi@linux.intel.com>
To: Mark Brown <broonie@kernel.org>
Cc: Jisheng Zhang <jszhang@marvell.com>,
mathias.nyman@linux.intel.com, gregkh@linuxfoundation.org,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
yendapally.reddy@broadcom.com
Subject: Re: [RESEND PATCH v2 7/7] usb: xhci: plat: add vbus regulator control
Date: Wed, 27 Apr 2016 13:25:27 +0300 [thread overview]
Message-ID: <87oa8vmjqg.fsf@intel.com> (raw)
In-Reply-To: <20160427095738.GG3217@sirena.org.uk>
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Hi,
Mark Brown <broonie@kernel.org> writes:
> On Wed, Apr 27, 2016 at 08:37:20AM +0300, Felipe Balbi wrote:
>> Jisheng Zhang <jszhang@marvell.com> writes:
>
>> > + vbus = devm_regulator_get(&pdev->dev, "vbus");
>
>> devm_regulator_get_optional() ??
>
> Does USB work without a VBUS? Unless the answer is yes then I'd expect
<joke> it can, just source VBUS from a lab power supply </joke>
> this to be just a normal regulator_get().
jokes aside, this regulator is optional because not all platforms
require a SW controlled regulator, no ? Will normal regulator_get() give
us a dummy regulator in case it's not listed in DT/ACPI ?
--
balbi
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From: felipe.balbi@linux.intel.com (Felipe Balbi)
To: linux-arm-kernel@lists.infradead.org
Subject: [RESEND PATCH v2 7/7] usb: xhci: plat: add vbus regulator control
Date: Wed, 27 Apr 2016 13:25:27 +0300 [thread overview]
Message-ID: <87oa8vmjqg.fsf@intel.com> (raw)
In-Reply-To: <20160427095738.GG3217@sirena.org.uk>
Hi,
Mark Brown <broonie@kernel.org> writes:
> On Wed, Apr 27, 2016 at 08:37:20AM +0300, Felipe Balbi wrote:
>> Jisheng Zhang <jszhang@marvell.com> writes:
>
>> > + vbus = devm_regulator_get(&pdev->dev, "vbus");
>
>> devm_regulator_get_optional() ??
>
> Does USB work without a VBUS? Unless the answer is yes then I'd expect
<joke> it can, just source VBUS from a lab power supply </joke>
> this to be just a normal regulator_get().
jokes aside, this regulator is optional because not all platforms
require a SW controlled regulator, no ? Will normal regulator_get() give
us a dummy regulator in case it's not listed in DT/ACPI ?
--
balbi
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next prev parent reply other threads:[~2016-04-27 10:27 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-26 12:57 [RESEND PATCH v2 0/7] usb: xhci-plat: support generic PHY and vbus regulator Jisheng Zhang
2016-04-26 12:57 ` Jisheng Zhang
2016-04-26 12:57 ` [RESEND PATCH v2 1/7] usb: xhci: plat: Fix suspend/resume when the optional clk exists Jisheng Zhang
2016-04-26 12:57 ` Jisheng Zhang
2016-04-27 5:25 ` Felipe Balbi
2016-04-27 5:25 ` Felipe Balbi
2016-04-27 5:46 ` Jisheng Zhang
2016-04-27 5:46 ` Jisheng Zhang
2016-04-26 12:57 ` [RESEND PATCH v2 2/7] usb: xhci: plat: attach the usb_phy to the correct hcd Jisheng Zhang
2016-04-26 12:57 ` Jisheng Zhang
2016-04-27 5:29 ` Felipe Balbi
2016-04-27 5:29 ` Felipe Balbi
2016-04-27 5:59 ` Jisheng Zhang
2016-04-27 5:59 ` Jisheng Zhang
2016-04-27 6:19 ` Felipe Balbi
2016-04-27 6:19 ` Felipe Balbi
2016-04-26 12:57 ` [RESEND PATCH v2 3/7] usb: xhci: plat: Fix suspend/resume when the optional usb_phy exists Jisheng Zhang
2016-04-26 12:57 ` Jisheng Zhang
2016-04-27 5:30 ` Felipe Balbi
2016-04-27 5:30 ` Felipe Balbi
2016-04-26 12:57 ` [RESEND PATCH v2 4/7] usb: xhci: plat: sort the headers in alphabetic order Jisheng Zhang
2016-04-26 12:57 ` Jisheng Zhang
2016-04-26 12:57 ` [RESEND PATCH v2 5/7] usb: xhci: plat: Remove checks for optional clock in error/remove path Jisheng Zhang
2016-04-26 12:57 ` Jisheng Zhang
2016-04-27 5:33 ` Felipe Balbi
2016-04-27 5:33 ` Felipe Balbi
2016-04-27 6:33 ` Jisheng Zhang
2016-04-27 6:33 ` Jisheng Zhang
2016-04-27 7:19 ` Felipe Balbi
2016-04-27 7:19 ` Felipe Balbi
2016-04-26 12:57 ` [RESEND PATCH v2 6/7] usb: xhci: plat: add generic PHY support Jisheng Zhang
2016-04-26 12:57 ` Jisheng Zhang
2016-04-27 5:35 ` Felipe Balbi
2016-04-27 5:35 ` Felipe Balbi
2016-04-27 6:46 ` Jisheng Zhang
2016-04-27 6:46 ` Jisheng Zhang
2016-04-27 7:21 ` Felipe Balbi
2016-04-27 7:21 ` Felipe Balbi
2016-04-27 7:57 ` Heikki Krogerus
2016-04-27 7:57 ` Heikki Krogerus
2016-04-27 9:34 ` Felipe Balbi
2016-04-27 9:34 ` Felipe Balbi
2016-04-26 12:57 ` [RESEND PATCH v2 7/7] usb: xhci: plat: add vbus regulator control Jisheng Zhang
2016-04-26 12:57 ` Jisheng Zhang
2016-04-27 5:37 ` Felipe Balbi
2016-04-27 5:37 ` Felipe Balbi
2016-04-27 9:57 ` Mark Brown
2016-04-27 9:57 ` Mark Brown
2016-04-27 10:25 ` Jisheng Zhang
2016-04-27 10:25 ` Jisheng Zhang
2016-04-27 13:24 ` Mark Brown
2016-04-27 13:24 ` Mark Brown
2016-04-27 10:25 ` Felipe Balbi [this message]
2016-04-27 10:25 ` Felipe Balbi
2016-04-27 10:35 ` Mark Brown
2016-04-27 10:35 ` Mark Brown
2016-04-27 10:38 ` Felipe Balbi
2016-04-27 10:38 ` Felipe Balbi
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