From: Dmitry Osipenko <digetx@gmail.com> To: Mark Brown <broonie@kernel.org>, robh+dt@kernel.org, mark.rutland@arm.com Cc: Sowjanya Komatineni <skomatineni@nvidia.com>, thierry.reding@gmail.com, jonathanh@nvidia.com, mperttunen@nvidia.com, gregkh@linuxfoundation.org, sboyd@kernel.org, tglx@linutronix.de, allison@lohutok.net, pdeschrijver@nvidia.com, pgaikwad@nvidia.com, mturquette@baylibre.com, horms+renesas@verge.net.au, Jisheng.Zhang@synaptics.com, krzk@kernel.org, arnd@arndb.de, spujar@nvidia.com, josephl@nvidia.com, vidyas@nvidia.com, daniel.lezcano@linaro.org, mmaddireddy@nvidia.com, markz@nvidia.com, devicetree@vger.kernel.org, linux-clk@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org, lgirdwood@gmail.com, perex@perex.cz, tiwai@suse.com, alexios.zavras@intel.com, alsa-devel@alsa-project.org Subject: Re: [PATCH v3 09/15] ASoC: tegra: Add fallback for audio mclk Date: Tue, 10 Dec 2019 21:24:43 +0300 [thread overview] Message-ID: <560185d9-32fd-a85e-5feb-105f79b953c6@gmail.com> (raw) In-Reply-To: <20191209204735.GK5483@sirena.org.uk> 09.12.2019 23:47, Mark Brown пишет: > On Mon, Dec 09, 2019 at 11:31:59PM +0300, Dmitry Osipenko wrote: >> 09.12.2019 19:40, Mark Brown пишет: > >>> Why would this need to be a stable fix? Presumably people with stable >>> kernels are using the old device tree anyway? > >> At least Rob Herring is asking to maintain backwards compatibility >> because some ditros are using newer device-trees with stable kernels. > > You're talking about forwards compatibility not backwards here. Are > those distros actually using LTS kernels? I think openSUSE Leap could be one of those distros that use LTS kernel with newer device-trees, but that's not 100%. Maybe Rob could help clarifying that. >> I'm personally also tending to use the newer DTB with older kernel >> version whenever there is a need to check something using stable kernel. >> Perhaps losing sound is not very important, but will be nicer if that >> doesn't happen. > > That really does sound like a "you broke it, you get all the pieces" > situation TBH... I'd be a lot more comfortable if the stable kernels > were sticking to bugfix only though I do appreciate that they're not > really that any more. In some cases it could be painful to maintain device-tree compatibility for platforms like NVIDIA Tegra SoCs because hardware wasn't modeled correctly from the start. I agree that people should use relevant device-trees. It's quite a lot of hassle to care about compatibility for platforms that are permanently in a development state. It could be more reasonable to go through the pain if kernel required a full-featured device tree for every SoC from the start. But maybe Tegra / device-tree maintainers have a different opinion. IIUC, device-trees are meant to be stable and software-agnostic, at least that was the case not so long time ago and I don't think that this premise changed.
WARNING: multiple messages have this Message-ID (diff)
From: Dmitry Osipenko <digetx@gmail.com> To: Mark Brown <broonie@kernel.org>, robh+dt@kernel.org, mark.rutland@arm.com Cc: alsa-devel@alsa-project.org, pgaikwad@nvidia.com, lgirdwood@gmail.com, spujar@nvidia.com, mperttunen@nvidia.com, thierry.reding@gmail.com, josephl@nvidia.com, linux-clk@vger.kernel.org, mmaddireddy@nvidia.com, daniel.lezcano@linaro.org, krzk@kernel.org, jonathanh@nvidia.com, mturquette@baylibre.com, devicetree@vger.kernel.org, arnd@arndb.de, markz@nvidia.com, alexios.zavras@intel.com, tiwai@suse.com, linux-tegra@vger.kernel.org, horms+renesas@verge.net.au, tglx@linutronix.de, allison@lohutok.net, sboyd@kernel.org, gregkh@linuxfoundation.org, pdeschrijver@nvidia.com, linux-kernel@vger.kernel.org, vidyas@nvidia.com, Jisheng.Zhang@synaptics.com, Sowjanya Komatineni <skomatineni@nvidia.com> Subject: Re: [alsa-devel] [PATCH v3 09/15] ASoC: tegra: Add fallback for audio mclk Date: Tue, 10 Dec 2019 21:24:43 +0300 [thread overview] Message-ID: <560185d9-32fd-a85e-5feb-105f79b953c6@gmail.com> (raw) In-Reply-To: <20191209204735.GK5483@sirena.org.uk> 09.12.2019 23:47, Mark Brown пишет: > On Mon, Dec 09, 2019 at 11:31:59PM +0300, Dmitry Osipenko wrote: >> 09.12.2019 19:40, Mark Brown пишет: > >>> Why would this need to be a stable fix? Presumably people with stable >>> kernels are using the old device tree anyway? > >> At least Rob Herring is asking to maintain backwards compatibility >> because some ditros are using newer device-trees with stable kernels. > > You're talking about forwards compatibility not backwards here. Are > those distros actually using LTS kernels? I think openSUSE Leap could be one of those distros that use LTS kernel with newer device-trees, but that's not 100%. Maybe Rob could help clarifying that. >> I'm personally also tending to use the newer DTB with older kernel >> version whenever there is a need to check something using stable kernel. >> Perhaps losing sound is not very important, but will be nicer if that >> doesn't happen. > > That really does sound like a "you broke it, you get all the pieces" > situation TBH... I'd be a lot more comfortable if the stable kernels > were sticking to bugfix only though I do appreciate that they're not > really that any more. In some cases it could be painful to maintain device-tree compatibility for platforms like NVIDIA Tegra SoCs because hardware wasn't modeled correctly from the start. I agree that people should use relevant device-trees. It's quite a lot of hassle to care about compatibility for platforms that are permanently in a development state. It could be more reasonable to go through the pain if kernel required a full-featured device tree for every SoC from the start. But maybe Tegra / device-tree maintainers have a different opinion. IIUC, device-trees are meant to be stable and software-agnostic, at least that was the case not so long time ago and I don't think that this premise changed. _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
next prev parent reply other threads:[~2019-12-10 18:24 UTC|newest] Thread overview: 160+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-12-06 2:48 [PATCH v3 00/15] Move PMC clocks into Tegra PMC driver Sowjanya Komatineni 2019-12-06 2:48 ` [alsa-devel] " Sowjanya Komatineni 2019-12-06 2:48 ` Sowjanya Komatineni 2019-12-06 2:48 ` [PATCH v3 01/15] dt-bindings: soc: tegra-pmc: Add Tegra PMC clock bindings Sowjanya Komatineni 2019-12-06 2:48 ` [alsa-devel] " Sowjanya Komatineni 2019-12-06 2:48 ` Sowjanya Komatineni 2019-12-06 18:58 ` Michał Mirosław 2019-12-06 18:58 ` [alsa-devel] " Michał Mirosław 2019-12-06 2:48 ` [PATCH v3 02/15] dt-bindings: tegra: Convert Tegra PMC bindings to YAML Sowjanya Komatineni 2019-12-06 2:48 ` [alsa-devel] " Sowjanya Komatineni 2019-12-06 2:48 ` Sowjanya Komatineni 2019-12-06 2:48 ` [PATCH v3 03/15] soc: tegra: Add Tegra PMC clock registrations into PMC driver Sowjanya Komatineni 2019-12-06 2:48 ` [alsa-devel] " Sowjanya Komatineni 2019-12-06 2:48 ` Sowjanya Komatineni 2019-12-07 14:28 ` Dmitry Osipenko 2019-12-07 14:28 ` [alsa-devel] " Dmitry Osipenko 2019-12-07 15:47 ` Dmitry Osipenko 2019-12-07 15:47 ` [alsa-devel] " Dmitry Osipenko 2019-12-07 15:53 ` Dmitry Osipenko 2019-12-07 15:53 ` [alsa-devel] " Dmitry Osipenko 2019-12-07 16:00 ` Dmitry Osipenko 2019-12-07 16:00 ` [alsa-devel] " Dmitry Osipenko 2019-12-07 19:59 ` Sowjanya Komatineni 2019-12-07 19:59 ` Sowjanya Komatineni 2019-12-07 21:36 ` Sowjanya Komatineni 2019-12-07 21:36 ` Sowjanya Komatineni 2019-12-09 20:12 ` Dmitry Osipenko 2019-12-09 20:12 ` [alsa-devel] " Dmitry Osipenko 2019-12-09 20:46 ` Sowjanya Komatineni 2019-12-09 20:46 ` Sowjanya Komatineni 2019-12-09 23:03 ` Sowjanya Komatineni 2019-12-09 23:03 ` Sowjanya Komatineni 2019-12-10 16:53 ` Sowjanya Komatineni 2019-12-10 16:53 ` Sowjanya Komatineni 2019-12-10 17:41 ` Dmitry Osipenko 2019-12-10 17:41 ` [alsa-devel] " Dmitry Osipenko 2019-12-11 1:06 ` Sowjanya Komatineni 2019-12-11 1:06 ` Sowjanya Komatineni 2019-12-11 18:50 ` Sowjanya Komatineni 2019-12-11 18:50 ` Sowjanya Komatineni 2019-12-12 1:39 ` Dmitry Osipenko 2019-12-12 1:39 ` [alsa-devel] " Dmitry Osipenko 2019-12-12 3:45 ` Sowjanya Komatineni 2019-12-12 3:45 ` Sowjanya Komatineni 2019-12-12 3:54 ` Sowjanya Komatineni 2019-12-12 3:54 ` Sowjanya Komatineni 2019-12-12 22:13 ` Dmitry Osipenko 2019-12-12 22:13 ` [alsa-devel] " Dmitry Osipenko 2019-12-11 15:10 ` Peter De Schrijver 2019-12-11 15:10 ` [alsa-devel] " Peter De Schrijver 2019-12-11 15:10 ` Peter De Schrijver 2019-12-12 1:43 ` Dmitry Osipenko 2019-12-12 1:43 ` [alsa-devel] " Dmitry Osipenko 2019-12-16 12:20 ` Peter De Schrijver 2019-12-16 12:20 ` [alsa-devel] " Peter De Schrijver 2019-12-16 12:20 ` Peter De Schrijver 2019-12-16 14:23 ` Dmitry Osipenko 2019-12-16 14:23 ` [alsa-devel] " Dmitry Osipenko 2019-12-16 15:11 ` Peter De Schrijver 2019-12-16 15:11 ` [alsa-devel] " Peter De Schrijver 2019-12-16 15:11 ` Peter De Schrijver 2019-12-16 15:24 ` Peter De Schrijver 2019-12-16 15:24 ` [alsa-devel] " Peter De Schrijver 2019-12-16 15:24 ` Peter De Schrijver 2019-12-16 15:49 ` Dmitry Osipenko 2019-12-16 15:49 ` [alsa-devel] " Dmitry Osipenko 2019-12-10 17:41 ` Dmitry Osipenko 2019-12-10 17:41 ` [alsa-devel] " Dmitry Osipenko [not found] ` <22a2f8bd-561d-f4c6-4eef-bb61095c53b2@nvidia.com> 2019-12-10 18:30 ` Dmitry Osipenko 2019-12-10 18:30 ` [alsa-devel] " Dmitry Osipenko 2019-12-10 19:18 ` Sowjanya Komatineni 2019-12-10 19:18 ` Sowjanya Komatineni 2019-12-10 20:31 ` Dmitry Osipenko 2019-12-10 20:31 ` [alsa-devel] " Dmitry Osipenko 2019-12-06 2:48 ` [PATCH v3 04/15] dt-bindings: soc: tegra-pmc: Add id for Tegra PMC blink control Sowjanya Komatineni 2019-12-06 2:48 ` [alsa-devel] " Sowjanya Komatineni 2019-12-06 2:48 ` Sowjanya Komatineni 2019-12-06 2:48 ` [PATCH v3 05/15] soc: pmc: Add blink output clock registration to Tegra PMC Sowjanya Komatineni 2019-12-06 2:48 ` [alsa-devel] " Sowjanya Komatineni 2019-12-06 2:48 ` Sowjanya Komatineni 2019-12-06 2:48 ` [PATCH v3 06/15] clk: tegra: Remove tegra_pmc_clk_init along with clk ids Sowjanya Komatineni 2019-12-06 2:48 ` [alsa-devel] " Sowjanya Komatineni 2019-12-06 2:48 ` Sowjanya Komatineni 2019-12-07 14:33 ` Dmitry Osipenko 2019-12-07 14:33 ` [alsa-devel] " Dmitry Osipenko 2019-12-07 14:43 ` Dmitry Osipenko 2019-12-07 14:43 ` [alsa-devel] " Dmitry Osipenko 2019-12-07 15:04 ` Dmitry Osipenko 2019-12-07 15:04 ` [alsa-devel] " Dmitry Osipenko 2019-12-07 19:35 ` Sowjanya Komatineni 2019-12-07 19:35 ` Sowjanya Komatineni 2019-12-07 23:24 ` Dmitry Osipenko 2019-12-07 23:24 ` [alsa-devel] " Dmitry Osipenko 2019-12-06 2:48 ` [PATCH v3 07/15] dt-bindings: clock: tegra: Remove pmc clock ids from clock dt-bindings Sowjanya Komatineni 2019-12-06 2:48 ` [alsa-devel] " Sowjanya Komatineni 2019-12-06 2:48 ` Sowjanya Komatineni 2019-12-06 2:48 ` [PATCH v3 08/15] ASoC: tegra: Add audio mclk control through clk_out_1 and extern1 Sowjanya Komatineni 2019-12-06 2:48 ` [alsa-devel] " Sowjanya Komatineni 2019-12-06 2:48 ` Sowjanya Komatineni 2019-12-07 14:58 ` Dmitry Osipenko 2019-12-07 14:58 ` [alsa-devel] " Dmitry Osipenko 2019-12-07 19:20 ` Sowjanya Komatineni 2019-12-07 19:20 ` Sowjanya Komatineni 2019-12-09 20:06 ` Dmitry Osipenko 2019-12-09 20:06 ` [alsa-devel] " Dmitry Osipenko 2019-12-09 23:05 ` Sowjanya Komatineni 2019-12-09 23:05 ` Sowjanya Komatineni 2019-12-09 23:12 ` Dmitry Osipenko 2019-12-09 23:12 ` [alsa-devel] " Dmitry Osipenko 2019-12-10 0:54 ` Sowjanya Komatineni 2019-12-10 0:54 ` Sowjanya Komatineni 2019-12-17 1:29 ` Sowjanya Komatineni 2019-12-17 1:29 ` Sowjanya Komatineni 2019-12-17 15:36 ` Dmitry Osipenko 2019-12-17 15:36 ` [alsa-devel] " Dmitry Osipenko 2019-12-17 16:12 ` Sowjanya Komatineni 2019-12-17 16:12 ` Sowjanya Komatineni 2019-12-17 16:16 ` Dmitry Osipenko 2019-12-17 16:16 ` [alsa-devel] " Dmitry Osipenko 2019-12-17 16:39 ` Sowjanya Komatineni 2019-12-17 16:39 ` Sowjanya Komatineni 2019-12-17 16:46 ` Dmitry Osipenko 2019-12-17 16:46 ` [alsa-devel] " Dmitry Osipenko 2019-12-06 2:48 ` [PATCH v3 09/15] ASoC: tegra: Add fallback for audio mclk Sowjanya Komatineni 2019-12-06 2:48 ` [alsa-devel] " Sowjanya Komatineni 2019-12-06 2:48 ` Sowjanya Komatineni 2019-12-06 17:49 ` Sowjanya Komatineni 2019-12-06 17:49 ` [alsa-devel] " Sowjanya Komatineni 2019-12-06 17:49 ` Sowjanya Komatineni 2019-12-06 17:56 ` Greg KH 2019-12-06 17:56 ` [alsa-devel] " Greg KH 2019-12-09 16:40 ` Mark Brown 2019-12-09 16:40 ` [alsa-devel] " Mark Brown 2019-12-09 20:31 ` Dmitry Osipenko 2019-12-09 20:31 ` [alsa-devel] " Dmitry Osipenko 2019-12-09 20:47 ` Mark Brown 2019-12-09 20:47 ` [alsa-devel] " Mark Brown 2019-12-10 18:24 ` Dmitry Osipenko [this message] 2019-12-10 18:24 ` Dmitry Osipenko 2019-12-10 18:59 ` Mark Brown 2019-12-10 18:59 ` [alsa-devel] " Mark Brown 2019-12-12 2:17 ` Dmitry Osipenko 2019-12-12 2:17 ` [alsa-devel] " Dmitry Osipenko 2019-12-06 2:48 ` [PATCH v3 10/15] clk: tegra: Remove extern1 and cdev1 from clocks inittable Sowjanya Komatineni 2019-12-06 2:48 ` [alsa-devel] " Sowjanya Komatineni 2019-12-06 2:48 ` Sowjanya Komatineni 2019-12-06 2:48 ` [PATCH v3 11/15] ARM: dts: tegra: Add clock-cells property to pmc Sowjanya Komatineni 2019-12-06 2:48 ` [alsa-devel] " Sowjanya Komatineni 2019-12-06 2:48 ` Sowjanya Komatineni 2019-12-07 14:26 ` [PATCH v3 00/15] Move PMC clocks into Tegra PMC driver Dmitry Osipenko 2019-12-07 14:26 ` [alsa-devel] " Dmitry Osipenko 2019-12-07 19:22 ` Sowjanya Komatineni 2019-12-07 19:22 ` Sowjanya Komatineni [not found] <1575600438-26795-1-git-send-email-skomatineni@nvidia.com> 2019-12-06 2:47 ` [PATCH v3 09/15] ASoC: tegra: Add fallback for audio mclk Sowjanya Komatineni 2019-12-06 7:09 ` Greg KH 2019-12-06 16:19 ` Sowjanya Komatineni 2019-12-06 16:29 ` Greg KH 2019-12-06 17:11 ` Sowjanya Komatineni 2019-12-06 17:15 ` Sowjanya Komatineni 2019-12-06 17:55 ` Greg KH
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