From mboxrd@z Thu Jan 1 00:00:00 1970 From: pullip.cho@samsung.com (Cho KyongHo) Date: Thu, 01 May 2014 23:16:26 +0900 Subject: [PATCH v12 30/31] ARM: dts: add System MMU nodes of exynos5250 In-Reply-To: References: <1398584283-22846-1-git-send-email-shaik.ameer@samsung.com> <1398584283-22846-31-git-send-email-shaik.ameer@samsung.com> Message-ID: <20140501231626.fd15cca4a30891f81c953a44@samsung.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Mon, 28 Apr 2014 16:13:19 -0700, Doug Anderson wrote: > Vikas, > > > On Sun, Apr 27, 2014 at 10:39 AM, Vikas Sajjan wrote: > > Hi shaik, > > > > +Doug, Abhilash, > > > > On Sun, Apr 27, 2014 at 1:08 PM, Shaik Ameer Basha > > wrote: > >> From: Cho KyongHo > >> > >> Signed-off-by: Cho KyongHo > >> --- > >> arch/arm/boot/dts/exynos5250.dtsi | 270 ++++++++++++++++++++++++++++++++++++- > >> 1 file changed, 267 insertions(+), 3 deletions(-) > >> > >> diff --git a/arch/arm/boot/dts/exynos5250.dtsi b/arch/arm/boot/dts/exynos5250.dtsi > >> index 3742331..eebd397 100644 > >> --- a/arch/arm/boot/dts/exynos5250.dtsi > >> +++ b/arch/arm/boot/dts/exynos5250.dtsi > >> @@ -82,6 +82,16 @@ > >> reg = <0x10044040 0x20>; > >> }; > >> > >> + pd_isp: isp-power-domain at 0x10044020 { > >> + compatible = "samsung,exynos4210-pd"; > >> + reg = <0x10044020 0x20>; > >> + }; > >> + > >> + pd_disp1: disp1-power-domain at 0x100440A0 { > >> + compatible = "samsung,exynos4210-pd"; > >> + reg = <0x100440A0 0x20>; > >> + }; > >> + > > > > As per subject "add System MMU nodes of exynos5250", it should only > > add SysMMU node. > > So, I think adding power domain nodes should go in a separate patch. > > > > Adding power domain nodes can break the system, if powering ON/OFF of > > the given power domain is NOT taken care well. > > I can see ISP is one such case. With this series I can see S2R breaks > > [1] on 5250 chromebook with current mainline kernel (same applies for > > arndale and smdk5250, but I have tested on these boards yet) > > Thanks for catching that! Let's make sure not to break suspend/resume. > > Given that these power domains are actually used as the domains for > some of the System MMU nodes I don't totally object to adding them in > the same patch, but if they're breaking things then I agree that we > could leave them out and add them in a later patch (once issues are > sorted out). > Thank you, Vikas. Let me consider adding ISP power doamin after checking power down sequence of ISP domain. KyongHo