linux-kernel - Re: [PATCH] phy: rockchip-inno-usb2: add COMMON

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Date:	Wed, 17 Aug 2016 12:19:20 +0200
From:	Heiko Stübner <heiko@...ech.de>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Frank Wang <frank.wang@...k-chips.com>, kishon@...com,
	dianders@...omium.org, jwerner@...omium.org, robh+dt@...nel.org,
	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-usb@...r.kernel.org, linux-rockchip@...ts.infradead.org,
	xzy.xu@...k-chips.com, kever.yang@...k-chips.com,
	huangtao@...k-chips.com, william.wu@...k-chips.com,
	daniel.meng@...k-chips.com
Subject: Re: [PATCH] phy: rockchip-inno-usb2: add COMMON_CLK dependency

Am Dienstag, 16. August 2016, 09:31:50 schrieb Guenter Roeck:
> On Tue, Aug 16, 2016 at 02:02:00PM +0800, Frank Wang wrote:
> > On kernel builds without COMMON_CLK, the newly added rockchip-inno-usb2
> > driver fails to build:
> > 
> > drivers/phy/phy-rockchip-inno-usb2.c:124:16: error: field 'clk480m_hw'
> > has incomplete type
> > 
> >    struct clk_hw clk480m_hw;
> > 
> > In file included from include/linux/clk.h:16:0
> > 
> >                  from drivers/phy/phy-rockchip-inno-usb2.c:17:
> > include/linux/kernel.h:831:48: error: initialization from incompatible
> > pointer type [-Werror=incompatible-pointer-types]
> > 
> >    const typeof( ((type *)0)->member ) *__mptr = (ptr); \
> >   
> >   ... ...
> > 
> > Signed-off-by: Frank Wang <frank.wang@...k-chips.com>
> > ---
> > 
> >  drivers/phy/Kconfig |    1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> > index f9bf981..c6d57e5 100644
> > --- a/drivers/phy/Kconfig
> > +++ b/drivers/phy/Kconfig
> > @@ -370,6 +370,7 @@ config PHY_ROCKCHIP_USB
> > 
> >  config PHY_ROCKCHIP_INNO_USB2
> >  
> >  	tristate "Rockchip INNO USB2PHY Driver"
> >  	depends on (ARCH_ROCKCHIP || COMPILE_TEST) && OF
> > 
> > +	depends on COMMON_CLK
> 
> Wonder what is preferred here. I find 33 "select COMMON_CLK" and
> 18 "depends on COMMON_CLK".

In drivers/ I count 12 select COMMON_CLK vs. 37 depends on COMMON_CLK
Do I need new glasses? :-)

With MMC_SDHCI_OF_ARASAN being the only one of all of them we're using on 
Rockchip platforms.

I vaguely remember depends being preferred over select in general, so you 
don't enable large parts by accident or cause some select chains - but I may 
be wrong.


> Either case
> 
> Reviewed-by: Guenter Roeck <linux@...ck-us.net>

for me as well:
Reviewed-by: Heiko Stuebner <heiko@...ech.de>


> 
> >  	select GENERIC_PHY
> >  	help
> >  	
> >  	  Support for Rockchip USB2.0 PHY with Innosilicon IP block.