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From: "Heiko Stübner" <heiko@sntech.de>
To: Sascha Hauer <s.hauer@pengutronix.de>, Rob Herring <robh@kernel.org>
Cc: dri-devel <dri-devel@lists.freedesktop.org>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	"open list:ARM/Rockchip SoC..."
	<linux-rockchip@lists.infradead.org>,
	devicetree@vger.kernel.org, Sascha Hauer <kernel@pengutronix.de>,
	Andy Yan <andy.yan@rock-chips.com>,
	Benjamin Gaignard <benjamin.gaignard@collabora.com>,
	Michael Riesch <michael.riesch@wolfvision.net>,
	Sandy Huang <hjc@rock-chips.com>,
	Peter Geis <pgwipeout@gmail.com>
Subject: Re: [PATCH 08/22] dt-bindings: display: rockchip: dw-hdmi: use "ref" as clock name
Date: Wed, 22 Dec 2021 20:39:58 +0100	[thread overview]
Message-ID: <8156864.jFcTpQmkuZ@diego> (raw)
In-Reply-To: <CAL_Jsq+jhaE7DWNu1=n9JX+oNp8XRW7mNi--8moDU6RYNyBgBw@mail.gmail.com>

Am Mittwoch, 22. Dezember 2021, 14:52:51 CET schrieb Rob Herring:
> On Wed, Dec 22, 2021 at 6:47 AM Sascha Hauer <s.hauer@pengutronix.de> wrote:
> >
> > On Tue, Dec 21, 2021 at 10:31:23AM -0400, Rob Herring wrote:
> > > On Mon, Dec 20, 2021 at 12:06:16PM +0100, Sascha Hauer wrote:
> > > > "vpll" is a misnomer. A clock input to a device should be named after
> > > > the usage in the device, not after the clock that drives it. On the
> > > > rk3568 the same clock is driven by the HPLL.
> > > > To fix that, this patch renames the vpll clock to ref clock.
> > >
> > > The problem with this series is it breaks an old kernel with new dt. You
> > > can partially mitigate that with stable kernel backport, but IMO keeping
> > > the old name is not a burden to maintain.
> >
> > As suggested I only removed vpll from the binding document, but not from
> > the code. The code still handles the old binding as well.
> 
> The problem is updating rk3399.dtsi. That change won't work with old
> kernels because they won't look for 'ref'. Since you shouldn't change
> it, the binding needs to cover both the old and new cases.

is "newer dt with old kernel" really a case these days?

I do understand the new kernel old dt case - for example with the
dtb being provided by firmware.

But which user would get the idea of updating only the devicetree
while staying with an older kernel?




WARNING: multiple messages have this Message-ID
From: "Heiko Stübner" <heiko@sntech.de>
To: Sascha Hauer <s.hauer@pengutronix.de>, Rob Herring <robh@kernel.org>
Cc: dri-devel <dri-devel@lists.freedesktop.org>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	"open list:ARM/Rockchip SoC..."
	<linux-rockchip@lists.infradead.org>,
	devicetree@vger.kernel.org, Sascha Hauer <kernel@pengutronix.de>,
	Andy Yan <andy.yan@rock-chips.com>,
	Benjamin Gaignard <benjamin.gaignard@collabora.com>,
	Michael Riesch <michael.riesch@wolfvision.net>,
	Sandy Huang <hjc@rock-chips.com>,
	Peter Geis <pgwipeout@gmail.com>
Subject: Re: [PATCH 08/22] dt-bindings: display: rockchip: dw-hdmi: use "ref" as clock name
Date: Wed, 22 Dec 2021 20:39:58 +0100	[thread overview]
Message-ID: <8156864.jFcTpQmkuZ@diego> (raw)
In-Reply-To: <CAL_Jsq+jhaE7DWNu1=n9JX+oNp8XRW7mNi--8moDU6RYNyBgBw@mail.gmail.com>

Am Mittwoch, 22. Dezember 2021, 14:52:51 CET schrieb Rob Herring:
> On Wed, Dec 22, 2021 at 6:47 AM Sascha Hauer <s.hauer@pengutronix.de> wrote:
> >
> > On Tue, Dec 21, 2021 at 10:31:23AM -0400, Rob Herring wrote:
> > > On Mon, Dec 20, 2021 at 12:06:16PM +0100, Sascha Hauer wrote:
> > > > "vpll" is a misnomer. A clock input to a device should be named after
> > > > the usage in the device, not after the clock that drives it. On the
> > > > rk3568 the same clock is driven by the HPLL.
> > > > To fix that, this patch renames the vpll clock to ref clock.
> > >
> > > The problem with this series is it breaks an old kernel with new dt. You
> > > can partially mitigate that with stable kernel backport, but IMO keeping
> > > the old name is not a burden to maintain.
> >
> > As suggested I only removed vpll from the binding document, but not from
> > the code. The code still handles the old binding as well.
> 
> The problem is updating rk3399.dtsi. That change won't work with old
> kernels because they won't look for 'ref'. Since you shouldn't change
> it, the binding needs to cover both the old and new cases.

is "newer dt with old kernel" really a case these days?

I do understand the new kernel old dt case - for example with the
dtb being provided by firmware.

But which user would get the idea of updating only the devicetree
while staying with an older kernel?




_______________________________________________
Linux-rockchip mailing list
Linux-rockchip@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-rockchip

WARNING: multiple messages have this Message-ID
From: "Heiko Stübner" <heiko@sntech.de>
To: Sascha Hauer <s.hauer@pengutronix.de>, Rob Herring <robh@kernel.org>
Cc: devicetree@vger.kernel.org,
	Benjamin Gaignard <benjamin.gaignard@collabora.com>,
	Peter Geis <pgwipeout@gmail.com>,
	Sandy Huang <hjc@rock-chips.com>,
	dri-devel <dri-devel@lists.freedesktop.org>,
	"open list:ARM/Rockchip SoC..."
	<linux-rockchip@lists.infradead.org>,
	Michael Riesch <michael.riesch@wolfvision.net>,
	Sascha Hauer <kernel@pengutronix.de>,
	Andy Yan <andy.yan@rock-chips.com>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 08/22] dt-bindings: display: rockchip: dw-hdmi: use "ref" as clock name
Date: Wed, 22 Dec 2021 20:39:58 +0100	[thread overview]
Message-ID: <8156864.jFcTpQmkuZ@diego> (raw)
In-Reply-To: <CAL_Jsq+jhaE7DWNu1=n9JX+oNp8XRW7mNi--8moDU6RYNyBgBw@mail.gmail.com>

Am Mittwoch, 22. Dezember 2021, 14:52:51 CET schrieb Rob Herring:
> On Wed, Dec 22, 2021 at 6:47 AM Sascha Hauer <s.hauer@pengutronix.de> wrote:
> >
> > On Tue, Dec 21, 2021 at 10:31:23AM -0400, Rob Herring wrote:
> > > On Mon, Dec 20, 2021 at 12:06:16PM +0100, Sascha Hauer wrote:
> > > > "vpll" is a misnomer. A clock input to a device should be named after
> > > > the usage in the device, not after the clock that drives it. On the
> > > > rk3568 the same clock is driven by the HPLL.
> > > > To fix that, this patch renames the vpll clock to ref clock.
> > >
> > > The problem with this series is it breaks an old kernel with new dt. You
> > > can partially mitigate that with stable kernel backport, but IMO keeping
> > > the old name is not a burden to maintain.
> >
> > As suggested I only removed vpll from the binding document, but not from
> > the code. The code still handles the old binding as well.
> 
> The problem is updating rk3399.dtsi. That change won't work with old
> kernels because they won't look for 'ref'. Since you shouldn't change
> it, the binding needs to cover both the old and new cases.

is "newer dt with old kernel" really a case these days?

I do understand the new kernel old dt case - for example with the
dtb being provided by firmware.

But which user would get the idea of updating only the devicetree
while staying with an older kernel?




WARNING: multiple messages have this Message-ID
From: "Heiko Stübner" <heiko@sntech.de>
To: Sascha Hauer <s.hauer@pengutronix.de>, Rob Herring <robh@kernel.org>
Cc: dri-devel <dri-devel@lists.freedesktop.org>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
	"open list:ARM/Rockchip SoC..."
	<linux-rockchip@lists.infradead.org>,
	devicetree@vger.kernel.org, Sascha Hauer <kernel@pengutronix.de>,
	Andy Yan <andy.yan@rock-chips.com>,
	Benjamin Gaignard <benjamin.gaignard@collabora.com>,
	Michael Riesch <michael.riesch@wolfvision.net>,
	Sandy Huang <hjc@rock-chips.com>,
	Peter Geis <pgwipeout@gmail.com>
Subject: Re: [PATCH 08/22] dt-bindings: display: rockchip: dw-hdmi: use "ref" as clock name
Date: Wed, 22 Dec 2021 20:39:58 +0100	[thread overview]
Message-ID: <8156864.jFcTpQmkuZ@diego> (raw)
In-Reply-To: <CAL_Jsq+jhaE7DWNu1=n9JX+oNp8XRW7mNi--8moDU6RYNyBgBw@mail.gmail.com>

Am Mittwoch, 22. Dezember 2021, 14:52:51 CET schrieb Rob Herring:
> On Wed, Dec 22, 2021 at 6:47 AM Sascha Hauer <s.hauer@pengutronix.de> wrote:
> >
> > On Tue, Dec 21, 2021 at 10:31:23AM -0400, Rob Herring wrote:
> > > On Mon, Dec 20, 2021 at 12:06:16PM +0100, Sascha Hauer wrote:
> > > > "vpll" is a misnomer. A clock input to a device should be named after
> > > > the usage in the device, not after the clock that drives it. On the
> > > > rk3568 the same clock is driven by the HPLL.
> > > > To fix that, this patch renames the vpll clock to ref clock.
> > >
> > > The problem with this series is it breaks an old kernel with new dt. You
> > > can partially mitigate that with stable kernel backport, but IMO keeping
> > > the old name is not a burden to maintain.
> >
> > As suggested I only removed vpll from the binding document, but not from
> > the code. The code still handles the old binding as well.
> 
> The problem is updating rk3399.dtsi. That change won't work with old
> kernels because they won't look for 'ref'. Since you shouldn't change
> it, the binding needs to cover both the old and new cases.

is "newer dt with old kernel" really a case these days?

I do understand the new kernel old dt case - for example with the
dtb being provided by firmware.

But which user would get the idea of updating only the devicetree
while staying with an older kernel?




_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2021-12-22 19:40 UTC|newest]

Thread overview: 189+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-20 11:06 [PATCH v3 00/22] drm/rockchip: RK356x VOP2 support Sascha Hauer
2021-12-20 11:06 ` Sascha Hauer
2021-12-20 11:06 ` Sascha Hauer
2021-12-20 11:06 ` Sascha Hauer
2021-12-20 11:06 ` [PATCH 01/22] drm/rockchip: dw_hdmi: Do not leave clock enabled in error case Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06 ` [PATCH 02/22] drm/rockchip: dw_hdmi: rename vpll clock to reference clock Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06 ` [PATCH 03/22] drm/rockchip: dw_hdmi: add rk3568 support Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06 ` [PATCH 04/22] drm/rockchip: dw_hdmi: add regulator support Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06 ` [PATCH 05/22] drm/rockchip: dw_hdmi: Add support for hclk Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06 ` [PATCH 06/22] dt-bindings: display: rockchip: dw-hdmi: Add compatible for rk3568 HDMI Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06 ` [PATCH 07/22] dt-bindings: display: rockchip: dw-hdmi: Make unwedge pinctrl optional Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 14:27   ` Rob Herring
2021-12-20 14:27     ` Rob Herring
2021-12-20 14:27     ` Rob Herring
2021-12-20 14:27     ` Rob Herring
2021-12-20 11:06 ` [PATCH 08/22] dt-bindings: display: rockchip: dw-hdmi: use "ref" as clock name Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 14:27   ` Rob Herring
2021-12-20 14:27     ` Rob Herring
2021-12-20 14:27     ` Rob Herring
2021-12-20 14:27     ` Rob Herring
2021-12-21 14:31   ` Rob Herring
2021-12-21 14:31     ` Rob Herring
2021-12-21 14:31     ` Rob Herring
2021-12-21 14:31     ` Rob Herring
2021-12-22 10:47     ` Sascha Hauer
2021-12-22 10:47       ` Sascha Hauer
2021-12-22 10:47       ` Sascha Hauer
2021-12-22 10:47       ` Sascha Hauer
2021-12-22 13:52       ` Rob Herring
2021-12-22 13:52         ` Rob Herring
2021-12-22 13:52         ` Rob Herring
2021-12-22 13:52         ` Rob Herring
2021-12-22 19:39         ` Heiko Stübner [this message]
2021-12-22 19:39           ` Heiko Stübner
2021-12-22 19:39           ` Heiko Stübner
2021-12-22 19:39           ` Heiko Stübner
2021-12-22 19:44           ` Nicolas Frattaroli
2021-12-22 19:44             ` Nicolas Frattaroli
2021-12-22 19:44             ` Nicolas Frattaroli
2021-12-22 19:44             ` Nicolas Frattaroli
2021-12-22 19:56           ` Rob Herring
2021-12-22 19:56             ` Rob Herring
2021-12-22 19:56             ` Rob Herring
2021-12-22 19:56             ` Rob Herring
2021-12-20 11:06 ` [PATCH 09/22] dt-bindings: display: rockchip: dw-hdmi: Add regulator support Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 14:27   ` Rob Herring
2021-12-20 14:27     ` Rob Herring
2021-12-20 14:27     ` Rob Herring
2021-12-20 14:27     ` Rob Herring
2021-12-20 11:06 ` [PATCH 10/22] dt-bindings: display: rockchip: dw-hdmi: Add additional clock Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06 ` [PATCH 11/22] dt-bindings: display: rockchip: Add binding for VOP2 Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 14:27   ` Rob Herring
2021-12-20 14:27     ` Rob Herring
2021-12-20 14:27     ` Rob Herring
2021-12-20 14:27     ` Rob Herring
2021-12-21 14:33   ` Rob Herring
2021-12-21 14:33     ` Rob Herring
2021-12-21 14:33     ` Rob Herring
2021-12-21 14:33     ` Rob Herring
2021-12-20 11:06 ` [PATCH 12/22] arm64: dts: rockchip: rk3399: reorder hmdi clocks Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06 ` [PATCH 13/22] arm64: dts: rockchip: rk3399: rename HDMI ref clock to 'ref' Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06 ` [PATCH 14/22] arm64: dts: rockchip: rk356x: Add VOP2 nodes Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06 ` [PATCH 15/22] arm64: dts: rockchip: rk356x: Add HDMI nodes Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06 ` [PATCH 16/22] arm64: dts: rockchip: rk3568-evb: Enable VOP2 and hdmi Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06 ` [PATCH 17/22] arm64: dts: rockchip: enable vop2 and hdmi tx on quartz64a Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06 ` [PATCH 18/22] clk: rk3568: drop CLK_SET_RATE_PARENT from dclk_vop* Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06 ` [PATCH 19/22] clk: rk3568: Add CLK_SET_RATE_PARENT to the HDMI reference clock Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06 ` [PATCH 20/22] drm/encoder: Add of_graph port to struct drm_encoder Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-21 17:31   ` Heiko Stübner
2021-12-21 17:31     ` Heiko Stübner
2021-12-21 17:31     ` Heiko Stübner
2021-12-21 17:31     ` Heiko Stübner
2021-12-20 11:06 ` [PATCH 21/22] drm/rockchip: Make VOP driver optional Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06 ` [PATCH 22/22] drm: rockchip: Add VOP2 driver Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 11:06   ` Sascha Hauer
2021-12-20 14:16   ` Nicolas Frattaroli
2021-12-20 14:16     ` Nicolas Frattaroli
2021-12-20 14:16     ` Nicolas Frattaroli
2021-12-20 14:16     ` Nicolas Frattaroli
2021-12-20 16:53     ` Nicolas Frattaroli
2021-12-20 16:53       ` Nicolas Frattaroli
2021-12-20 16:53       ` Nicolas Frattaroli
2021-12-20 16:53       ` Nicolas Frattaroli
2021-12-20 18:51     ` Sascha Hauer
2021-12-20 18:51       ` Sascha Hauer
2021-12-20 18:51       ` Sascha Hauer
2021-12-20 18:51       ` Sascha Hauer
2021-12-20 23:20   ` kernel test robot
2021-12-20 23:20     ` kernel test robot
2021-12-20 23:20     ` kernel test robot
2021-12-21 13:44   ` Nicolas Frattaroli
2021-12-21 13:44     ` Nicolas Frattaroli
2021-12-21 13:44     ` Nicolas Frattaroli
2021-12-21 13:44     ` Nicolas Frattaroli
2021-12-22 17:07     ` Nicolas Frattaroli
2021-12-22 17:07       ` Nicolas Frattaroli
2021-12-22 17:07       ` Nicolas Frattaroli
2021-12-22 17:07       ` Nicolas Frattaroli
2022-01-03 14:55     ` Sascha Hauer
2022-01-03 14:55       ` Sascha Hauer
2022-01-03 14:55       ` Sascha Hauer
2022-01-03 14:55       ` Sascha Hauer
2022-01-04 11:07   ` Andy Yan
2022-01-04 11:07     ` Andy Yan
2022-01-04 11:07     ` Andy Yan
2022-01-05 12:20     ` Sascha Hauer
2022-01-05 12:20       ` Sascha Hauer
2022-01-05 12:20       ` Sascha Hauer
2022-01-05 12:20       ` Sascha Hauer
2021-12-20 11:51 ` [PATCH v3 00/22] drm/rockchip: RK356x VOP2 support Nicolas Frattaroli
2021-12-20 11:51   ` Nicolas Frattaroli
2021-12-20 11:51   ` Nicolas Frattaroli
2021-12-20 11:51   ` Nicolas Frattaroli
2022-01-19 11:29 ` Piotr Oniszczuk
2022-01-19 11:29   ` Piotr Oniszczuk
2022-01-19 11:29   ` Piotr Oniszczuk
2022-01-19 11:29   ` Piotr Oniszczuk
2022-01-21 10:32   ` Sascha Hauer
2022-01-21 10:32     ` Sascha Hauer
2022-01-21 10:32     ` Sascha Hauer
2022-01-21 10:32     ` Sascha Hauer
2022-01-21 15:43     ` Piotr Oniszczuk
2022-01-21 15:43       ` Piotr Oniszczuk
2022-01-21 15:43       ` Piotr Oniszczuk
2022-01-21 15:43       ` Piotr Oniszczuk

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