From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kukjin Kim Subject: Re: [PATCH] ARM: dts: Add Exynos5250 Snow Rev5+ support Date: Wed, 30 Sep 2015 15:58:32 +0900 Message-ID: <560B8818.8020002@kernel.org> References: <1443527855-434-1-git-send-email-javier@osg.samsung.com> <560B2D29.5060707@samsung.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <560B2D29.5060707@samsung.com> Sender: linux-samsung-soc-owner@vger.kernel.org To: Krzysztof Kozlowski Cc: Javier Martinez Canillas , linux-kernel@vger.kernel.org, Mauro Carvalho Chehab , Doug Anderson , Olof Johansson , Russell King , Kukjin Kim , devicetree@vger.kernel.org, Kumar Gala , Ian Campbell , linux-samsung-soc@vger.kernel.org, Rob Herring , Pawel Moll , Mark Rutland , linux-arm-kernel@lists.infradead.org List-Id: devicetree@vger.kernel.org On 09/30/15 09:30, Krzysztof Kozlowski wrote: > On 29.09.2015 20:57, Javier Martinez Canillas wrote: >> There are 2 revisions of the Exynos5250 Snow Chromebook that were shipped: >> Rev4 and Rev5. The only difference between these 2 revisions is the codec, >> Rev4 has a max98095 codec while Rev5 has a max98090. >> >> Mainline only supports Rev4 so this patch moves the common device nodes to >> a DTSI file and adds a DTS for the Exynos5250 Snow Rev5. >> >> The Snow Rev5 DTS is based on the DTS found in the ChromiumOS 3.8 tree. >> >> Signed-off-by: Javier Martinez Canillas >> >> --- >> >> The DTS in the vendor ChromeOS tree are called exynos5250-snow-rev{4,5}.dtb >> but I decided to leave Rev4 as exynos5250-snow.dtb to avoid breaking u-boot >> that has CONFIG_DEFAULT_DEVICE_TREE="exynos5250-snow" in snow_defconfig. >> >> Also, ChromiumOS Rev4 DTS has "google,snow-rev4" in its compatible string >> but was not added in mainline since Rev4 firmware fallbacks to "google,snow" >> and Rev5 searches for "google,snow-rev5". That way the compatible string >> could be consistent with the DTS naming and still be able to pack both Rev4 >> and Rev5 FDT in the same FIT image and let the firmware pick the correct FDT. >> >> arch/arm/boot/dts/Makefile | 1 + >> arch/arm/boot/dts/exynos5250-snow-common.dtsi | 684 ++++++++++++++++++++++++++ >> arch/arm/boot/dts/exynos5250-snow-rev5.dts | 47 ++ >> arch/arm/boot/dts/exynos5250-snow.dts | 666 +------------------------ >> 4 files changed, 733 insertions(+), 665 deletions(-) >> create mode 100644 arch/arm/boot/dts/exynos5250-snow-common.dtsi >> create mode 100644 arch/arm/boot/dts/exynos5250-snow-rev5.dts > > Now the exynos5250-snow.dts means in fact Rev4... but there is no > information in DTS about it. I think adding compatible > "google,snow-rev4" makes sense: > 1. For informational purposes (this could be also handled with a comment). > 2. Later one could decide to switch the default meaning of "google,snow" > to Rev5 and the real compatible (rev4) will be there already. > > Could you add the new compatible and fix patch issues pointed by Doug? > Documenting for the compatibles would be required even I already applied its updated patch... - Kukjin