linux-kernel - Re: [PATCH v2 2/4] pinctrl: Add NVIDIA Tegra XUSB pad controller support

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Date:	Wed, 11 Jun 2014 15:06:37 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Andrew Bresticker <abrestic@...omium.org>,
	Thierry Reding <thierry.reding@...il.com>
CC:	Linus Walleij <linus.walleij@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/4] pinctrl: Add NVIDIA Tegra XUSB pad controller
 support

On 06/11/2014 02:23 PM, Andrew Bresticker wrote:
> On Tue, Jun 10, 2014 at 4:11 AM, Thierry Reding
> <thierry.reding@...il.com> wrote:
>> From: Thierry Reding <treding@...dia.com>
>>
>> The XUSB pad controller found on NVIDIA Tegra SoCs provides several pads
>> that lanes can be assigned to in order to support a variety of interface
>> options: USB 2.0, USB 3.0, PCIe and SATA.
>>
>> In addition to the pin controller used to assign lanes to pads two PHYs
>> are exposed to allow the bricks for PCIe and SATA to be powered up and
>> down by PCIe and SATA drivers.

>> diff --git a/drivers/pinctrl/pinctrl-tegra-xusb.c b/drivers/pinctrl/pinctrl-tegra-xusb.c

>> +static int tegra_xusb_padctl_pinconf_group_set(struct pinctrl_dev *pinctrl,
>> +                                              unsigned int group,
>> +                                              unsigned long *configs,
>> +                                              unsigned int num_configs)

>> +       for (i = 0; i < num_configs; i++) {
>> +               param = TEGRA_XUSB_PADCTL_UNPACK_PARAM(configs[i]);
>> +               value = TEGRA_XUSB_PADCTL_UNPACK_VALUE(configs[i]);
>> +
>> +               switch (param) {
>> +               case TEGRA_XUSB_PADCTL_IDDQ:
>> +                       value = padctl_readl(padctl, lane->offset);
> 
> This overwrites the configuration value - probably want to use a
> separate variable for the register value.

It'd be nice to trim what you quote so that people don't have to wade
through hundreds of lines of code to find a 2-line comment. It's easily
missed.
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