linux-kernel - Re: [PATCH v5 1/5] phy: add a driver for the Rockchip SoC internal USB2.0 PHY

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Date:	Wed, 10 Dec 2014 22:37:27 -0800
From:	Joe Perches <joe@...ches.com>
To:	Kishon Vijay Abraham I <kishon@...com>
Cc:	Yunzhi Li <lyz@...k-chips.com>, heiko@...ech.de,
	jwerner@...omium.org, dianders@...omium.org, olof@...om.net,
	huangtao@...k-chips.com, zyw@...k-chips.com, cf@...k-chips.com,
	linux-rockchip@...ts.infradead.org,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v5 1/5] phy: add a driver for the Rockchip SoC internal
 USB2.0 PHY

On Thu, 2014-12-11 at 11:57 +0530, Kishon Vijay Abraham I wrote:
> Hi,
> 
> On Thursday 11 December 2014 11:42 AM, Joe Perches wrote:
> > On Thu, 2014-12-11 at 11:32 +0530, Kishon Vijay Abraham I wrote:
> >> On Wednesday 10 December 2014 04:16 PM, Yunzhi Li wrote:
> >>> diff --git a/drivers/phy/phy-rockchip-usb.c b/drivers/phy/phy-rockchip-usb.c
> > []
> >>> +/*
> >>> + * The higher 16-bit of this register is used for write protection
> >>> + * only if BIT(13 + 16) set to 1 the BIT(13) can be written.
> >>> + */
> >>> +#define SIDDQ_MSK		BIT(13 + 16)
> > 
> > huh?
> > 
> > This #define looks _very_ odd.
> > 
> > Is this supposed to be a single bit 29 or
> > some range?
> 
> From what I understood, the most significant 16 bits are write locks to the
> least significant 16 bits.
> 
> So If I have to write something on bit 0, I have to set bit 16.
> If I have to write something on bit 1, I have to set bit 17.
> If I have to write something on bit 2, I have to set bit 18.
> and so on.

To me it'd look better to use another << rather than a plus


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