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?
next prev parent reply other threads:[~2021-12-22 19:40 UTC|newest]
Thread overview: 48+ 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 ` [PATCH 01/22] drm/rockchip: dw_hdmi: Do not leave clock enabled in error case 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 ` [PATCH 03/22] drm/rockchip: dw_hdmi: add rk3568 support Sascha Hauer
2021-12-20 11:06 ` [PATCH 04/22] drm/rockchip: dw_hdmi: add regulator support 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 ` [PATCH 06/22] dt-bindings: display: rockchip: dw-hdmi: Add compatible for rk3568 HDMI 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 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 14:27 ` Rob Herring
2021-12-21 14:31 ` Rob Herring
2021-12-22 10:47 ` Sascha Hauer
2021-12-22 13:52 ` Rob Herring
2021-12-22 19:39 ` Heiko Stübner [this message]
2021-12-22 19:44 ` Nicolas Frattaroli
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 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 ` [PATCH 11/22] dt-bindings: display: rockchip: Add binding for VOP2 Sascha Hauer
2021-12-20 14:27 ` 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 ` [PATCH 13/22] arm64: dts: rockchip: rk3399: rename HDMI ref clock to 'ref' Sascha Hauer
2021-12-20 11:06 ` [PATCH 14/22] arm64: dts: rockchip: rk356x: Add VOP2 nodes Sascha Hauer
2021-12-20 11:06 ` [PATCH 15/22] arm64: dts: rockchip: rk356x: Add HDMI nodes 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 ` [PATCH 17/22] arm64: dts: rockchip: enable vop2 and hdmi tx on quartz64a 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 ` [PATCH 19/22] clk: rk3568: Add CLK_SET_RATE_PARENT to the HDMI reference clock Sascha Hauer
2021-12-20 11:06 ` [PATCH 20/22] drm/encoder: Add of_graph port to struct drm_encoder Sascha Hauer
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 ` [PATCH 22/22] drm: rockchip: Add VOP2 driver Sascha Hauer
2021-12-20 14:16 ` Nicolas Frattaroli
2021-12-20 16:53 ` Nicolas Frattaroli
2021-12-20 18:51 ` Sascha Hauer
2021-12-20 23:20 ` kernel test robot
2021-12-21 13:44 ` Nicolas Frattaroli
2021-12-22 17:07 ` Nicolas Frattaroli
2022-01-03 14:55 ` Sascha Hauer
2022-01-04 11:07 ` Andy Yan
2022-01-05 12:20 ` Sascha Hauer
2021-12-20 11:51 ` [PATCH v3 00/22] drm/rockchip: RK356x VOP2 support Nicolas Frattaroli
2022-01-19 11:29 ` Piotr Oniszczuk
2022-01-21 10:32 ` Sascha Hauer
2022-01-21 15:43 ` Piotr Oniszczuk
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