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Date: Fri, 19 Feb 2016 01:11:37 +0300 From: Antony Pavlov <antonynpavlov@...il.com> To: Sergei Shtylyov <sergei.shtylyov@...entembedded.com> Cc: Alan Stern <stern@...land.harvard.edu>, Marek Vasut <marex@...x.de>, linux-mips@...ux-mips.org, Wills Wang <wills.wang@...e.com>, Daniel Schwierzeck <daniel.schwierzeck@...il.com>, Alban Bedel <albeu@...e.fr>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [RFC v5 07/15] usb: ehci: add vbus-gpio parameter On Thu, 18 Feb 2016 21:31:20 +0300 Sergei Shtylyov <sergei.shtylyov@...entembedded.com> wrote: > On 02/18/2016 09:06 PM, Antony Pavlov wrote: [...] > > so I use regulator in the TL-MR3020 board dts file: > > > > reg_usb_vbus: reg_usb_vbus { > > compatible = "regulator-fixed"; > > regulator-name = "usb_vbus"; > > regulator-min-microvolt = <5000000>; > > Not 0? > > > regulator-max-microvolt = <5000000>; > > gpio = <&gpio 8 GPIO_ACTIVE_HIGH>; > > Where's the switch if both voltages are equal? Here is a quote from linux/Documentation/devicetree/bindings/regulator/fixed-regulator.txt Any property defined as part of the core regulator binding, defined in regulator.txt, can also be used. However a fixed voltage regulator is expected to have the regulator-min-microvolt and regulator-max-microvolt to be the same. Moreover please see this of_get_fixed_voltage_config() code fragment (please see linux/drivers/regulator/fixed.c for details): if (init_data->constraints.min_uV == init_data->constraints.max_uV) { config->microvolts = init_data->constraints.min_uV; } else { dev_err(dev, "Fixed regulator specified with variable voltages\n"); return ERR_PTR(-EINVAL); } -- Best regards, Antony Pavlov
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