Message-ID: <9063025.MhkbZ0Pkbq@phil>
Date: Wed, 27 Aug 2025 08:50:49 +0200
From: Heiko Stuebner <heiko@...ech.de>
To: Yury Norov <yury.norov@...il.com>,
 Rasmus Villemoes <linux@...musvillemoes.dk>,
 Jaehoon Chung <jh80.chung@...sung.com>, Ulf Hansson <ulf.hansson@...aro.org>,
 Shreeya Patel <shreeya.patel@...labora.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>, Sandy Huang <hjc@...k-chips.com>,
 Andy Yan <andy.yan@...k-chips.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>,
 Nicolas Frattaroli <frattaroli.nicolas@...il.com>,
 Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
 Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
 Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Shawn Lin <shawn.lin@...k-chips.com>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>,
 Krzysztof Wilczyński <kwilczynski@...nel.org>,
 Manivannan Sadhasivam <mani@...nel.org>, Rob Herring <robh@...nel.org>,
 Bjorn Helgaas <bhelgaas@...gle.com>, Chanwoo Choi <cw00.choi@...sung.com>,
 MyungJoo Ham <myungjoo.ham@...sung.com>,
 Kyungmin Park <kyungmin.park@...sung.com>, Qin Jian <qinjian@...lus1.com>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd <sboyd@...nel.org>,
 Nathan Chancellor <nathan@...nel.org>,
 Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
 Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>,
 Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
Cc: kernel@...labora.com, linux-kernel@...r.kernel.org,
 linux-mmc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-rockchip@...ts.infradead.org, linux-media@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, linux-phy@...ts.infradead.org,
 linux-sound@...r.kernel.org, netdev@...r.kernel.org,
 linux-stm32@...md-mailman.stormreply.com, linux-pci@...r.kernel.org,
 linux-pm@...r.kernel.org, linux-clk@...r.kernel.org, llvm@...ts.linux.dev,
 Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
Subject:
 Re: [PATCH v3 01/20] bitmap: introduce hardware-specific bitfield operations

Am Montag, 25. August 2025, 10:28:21 Mitteleuropäische Sommerzeit schrieb Nicolas Frattaroli:
> Hardware of various vendors, but very notably Rockchip, often uses
> 32-bit registers where the upper 16-bit half of the register is a
> write-enable mask for the lower half.
> 
> This type of hardware setup allows for more granular concurrent register
> write access.
> 
> Over the years, many drivers have hand-rolled their own version of this
> macro, usually without any checks, often called something like
> HIWORD_UPDATE or FIELD_PREP_HIWORD, commonly with slightly different
> semantics between them.
> 
> Clearly there is a demand for such a macro, and thus the demand should
> be satisfied in a common header file. As this is a convention that spans
> across multiple vendors, and similar conventions may also have
> cross-vendor adoption, it's best if it lives in a vendor-agnostic header
> file that can be expanded over time.
> 
> Add hw_bitfield.h with two macros: FIELD_PREP_WM16, and
> FIELD_PREP_WM16_CONST. The latter is a version that can be used in
> initializers, like FIELD_PREP_CONST.
> 
> Suggested-by: Yury Norov [NVIDIA] <yury.norov@...il.com>
> Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@...labora.com>

Acked-by: Heiko Stuebner <heiko@...ech.de>

Powered by blists - more mailing lists