From: Bartosz Golaszewski <brgl@bgdev.pl>
To: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Cc: Thierry Reding <thierry.reding@gmail.com>,
Rob Herring <robh@kernel.org>,
Bjorn Andersson <quic_bjorande@quicinc.com>,
Kees Cook <keescook@chromium.org>,
linux-pwm@vger.kernel.org, Lee Jones <lee@kernel.org>,
Luca Weiss <luca@z3ntu.xyz>,
Conor Dooley <conor.dooley@microchip.com>,
Anjelique Melendez <quic_amelende@quicinc.com>,
Pavel Machek <pavel@ucw.cz>,
kernel@pengutronix.de, linux-leds@vger.kernel.org
Subject: Re: [PATCH v3 102/108] leds: qcom-lpg: Make use of devm_pwmchip_alloc() function
Date: Fri, 24 Nov 2023 22:21:10 +0100 [thread overview]
Message-ID: <CAMRc=Mf_xndugSqoY+uLHxsE+c2ztDfZ=eSh4xCGVCAbA4hjSg@mail.gmail.com> (raw)
In-Reply-To: <20231124182252.r7br2vgr5ralwoua@pengutronix.de>
On Fri, Nov 24, 2023 at 7:22 PM Uwe Kleine-König
<u.kleine-koenig@pengutronix.de> wrote:
>
[snip]
> - gpio: See how both gpio_chip and gpio_device have base, ngpio, a
> parent pointer (gpio_device has it in .dev), an owner and a label.
> Do they all have the same semantic? Yes? -> that's bad. No? ->
> that's IMHO even worse.
For the record: I am very well aware there are a lot of things wrong
with GPIO at the moment. It's years of technical debt biting back.
I've racked up ~100 patches last release cycle alone fixing various
cases of abuse of GPIOLIB in the wildest places (OMAP1?!). I'm slowly
doing cleanups all around the place but since GPIO is so ubiquitous
across the kernel tree, it's going quite slow. I'm going to get to the
duplication between gpio_chip and gpio_device but we still have users
in the kernel who shamelessly access gpio_chip directly without being
GPIO providers.
This is not an argument against the general approach I presented -
it's an argument against stacking up years' worth of cruft.
Bart
next prev parent reply other threads:[~2023-11-24 21:21 UTC|newest]
Thread overview: 163+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-21 13:49 [PATCH v3 000/108] pwm: Fix lifetime issues for pwm_chips Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 001/108] pwm: cros-ec: Change prototype of helper to prepare further changes Uwe Kleine-König
2023-11-22 8:52 ` Tzung-Bi Shih
2023-11-23 9:24 ` Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 002/108] pwm: Provide a macro to get the parent device of a given chip Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 003/108] pwm: ab8500: Make use of pwmchip_parent() macro Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 004/108] pwm: atmel: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 005/108] pwm: atmel-tcb: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 006/108] pwm: bcm-kona: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 007/108] pwm: crc: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 008/108] pwm: cros-ec: " Uwe Kleine-König
2023-11-22 8:52 ` Tzung-Bi Shih
2023-11-21 13:49 ` [PATCH v3 009/108] pwm: dwc: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 010/108] pwm: ep93xx: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 011/108] pwm: fsl-ftm: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 012/108] pwm: img: Make use of parent device pointer in driver data Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 013/108] pwm: imx27: Make use of pwmchip_parent() macro Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 014/108] pwm: jz4740: " Uwe Kleine-König
2023-11-21 14:13 ` Paul Cercueil
2023-11-21 15:51 ` Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 015/108] pwm: lpc18xx-sct: Make use of parent device pointer in driver data Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 016/108] pwm: lpss: Make use of pwmchip_parent() macro Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 017/108] pwm: mediatek: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 018/108] pwm: meson: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 019/108] pwm: mtk-disp: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 020/108] pwm: omap: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 021/108] pwm: pca9685: Store parent device in driver data Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 022/108] pwm: raspberrypi-poe: Make use of pwmchip_parent() macro Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 023/108] pwm: rcar: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 024/108] pwm: rz-mtu3: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 025/108] pwm: samsung: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 026/108] pwm: sifive: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 027/108] pwm: stm32-lp: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 028/108] pwm: stm32: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 029/108] pwm: stmpe: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 030/108] pwm: sun4i: " Uwe Kleine-König
2023-11-25 18:48 ` Jernej Škrabec
2023-11-21 13:49 ` [PATCH v3 031/108] pwm: tiecap: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 032/108] pwm: tiehrpwm: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 033/108] pwm: twl-led: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 034/108] pwm: twl: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 035/108] pwm: vt8500: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 036/108] staging: greybus: pwm: " Uwe Kleine-König
2023-11-23 12:55 ` Greg Kroah-Hartman
2023-11-21 13:49 ` [PATCH v3 037/108] pwm: Provide devm_pwmchip_alloc() function Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 038/108] pwm: ab8500: Make use of " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 039/108] pwm: apple: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 040/108] pwm: atmel-hlcdc: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 041/108] pwm: atmel: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 042/108] pwm: atmel-tcb: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 043/108] pwm: bcm2835: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 044/108] pwm: bcm-iproc: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 045/108] pwm: bcm-kona: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 046/108] pwm: berlin: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 047/108] pwm: brcmstb: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 048/108] pwm: clk: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 049/108] pwm: clps711x: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 050/108] pwm: crc: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 051/108] pwm: cros-ec: " Uwe Kleine-König
2023-11-22 8:52 ` Tzung-Bi Shih
2023-11-22 23:56 ` Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 052/108] pwm: dwc: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 053/108] pwm: ep93xx: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 054/108] pwm: fsl-ftm: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 055/108] pwm: hibvt: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 056/108] pwm: img: " Uwe Kleine-König
2023-11-21 13:49 ` [PATCH v3 057/108] pwm: imx1: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 058/108] pwm: imx27: " Uwe Kleine-König
2023-12-05 11:49 ` Philipp Zabel
2023-12-05 12:14 ` Uwe Kleine-König
2023-12-05 12:50 ` Philipp Zabel
2023-11-21 13:50 ` [PATCH v3 059/108] pwm: imx-tpm: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 060/108] pwm: intel-lgm: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 061/108] pwm: iqs620a: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 062/108] pwm: jz4740: " Uwe Kleine-König
2023-11-21 14:16 ` Paul Cercueil
2023-11-21 13:50 ` [PATCH v3 063/108] pwm: keembay: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 064/108] pwm: lp3943: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 065/108] pwm: lpc18xx-sct: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 066/108] pwm: lpc32xx: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 067/108] pwm: lpss-*: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 068/108] pwm: mediatek: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 069/108] pwm: meson: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 070/108] pwm: microchip-core: " Uwe Kleine-König
2023-11-22 11:14 ` Conor Dooley
2023-11-22 22:48 ` Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 071/108] pwm: mtk-disp: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 072/108] pwm: mxs: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 073/108] pwm: ntxec: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 074/108] pwm: omap-dmtimer: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 075/108] pwm: pca9685: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 076/108] pwm: pxa: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 077/108] pwm: raspberrypi-poe: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 078/108] pwm: rcar: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 079/108] pwm: renesas-tpu: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 080/108] pwm: rockchip: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 081/108] pwm: rz-mtu3: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 082/108] pwm: samsung: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 083/108] pwm: sifive: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 084/108] pwm: sl28cpld: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 085/108] pwm: spear: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 086/108] pwm: sprd: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 087/108] pwm: sti: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 088/108] pwm: stm32-lp: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 089/108] pwm: stm32: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 090/108] pwm: stmpe: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 091/108] pwm: sun4i: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 092/108] pwm: sunplus: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 093/108] pwm: tegra: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 094/108] pwm: tiecap: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 095/108] pwm: twl-led: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 096/108] pwm: twl: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 097/108] pwm: visconti: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 098/108] pwm: vt8500: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 099/108] pwm: xilinx: " Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 100/108] gpio: mvebu: " Uwe Kleine-König
2023-11-21 14:02 ` Bartosz Golaszewski
2023-11-21 16:11 ` Uwe Kleine-König
2023-11-22 9:05 ` Uwe Kleine-König
2023-11-22 10:36 ` Bartosz Golaszewski
2023-11-22 23:39 ` Uwe Kleine-König
2023-11-24 12:14 ` Thierry Reding
2023-11-24 21:16 ` Bartosz Golaszewski
2023-11-24 21:59 ` Uwe Kleine-König
2023-11-27 10:58 ` Uwe Kleine-König
2023-11-27 20:22 ` Bartosz Golaszewski
2023-11-28 9:07 ` Uwe Kleine-König
2023-12-01 10:14 ` Bartosz Golaszewski
2023-12-02 0:43 ` Uwe Kleine-König
2023-12-04 20:27 ` Bartosz Golaszewski
2023-12-04 21:28 ` Bartosz Golaszewski
2023-12-05 9:31 ` Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 101/108] drm/bridge: ti-sn65dsi86: " Uwe Kleine-König
2023-11-21 15:15 ` Doug Anderson
2023-11-21 16:05 ` Uwe Kleine-König
2023-11-21 16:14 ` Doug Anderson
2023-11-23 9:17 ` Uwe Kleine-König
2023-11-27 9:32 ` Uwe Kleine-König
2023-11-23 9:46 ` Laurent Pinchart
2023-11-23 10:10 ` Uwe Kleine-König
2023-12-06 12:06 ` Laurent Pinchart
2023-12-06 14:23 ` Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 102/108] leds: qcom-lpg: " Uwe Kleine-König
2023-11-21 15:16 ` Lee Jones
2023-11-21 15:58 ` Uwe Kleine-König
2023-11-22 11:56 ` Lee Jones
2023-11-22 17:15 ` Thierry Reding
2023-11-23 10:44 ` Uwe Kleine-König
2023-11-24 12:27 ` Thierry Reding
2023-11-24 18:22 ` Uwe Kleine-König
2023-11-24 21:21 ` Bartosz Golaszewski [this message]
2023-11-22 17:54 ` Uwe Kleine-König
2023-11-23 10:21 ` Lee Jones
2023-11-23 10:54 ` Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 104/108] pwm: Ensure that pwm_chips are allocated using pwmchip_alloc() Uwe Kleine-König
2023-11-22 17:19 ` Thierry Reding
2023-11-22 23:52 ` Uwe Kleine-König
2023-11-24 12:28 ` Thierry Reding
2023-11-21 13:50 ` [PATCH v3 105/108] pwm: Ensure a struct pwm has the same lifetime as its pwm_chip Uwe Kleine-König
2023-11-21 15:53 ` Gustavo A. R. Silva
2023-11-21 13:50 ` [PATCH v3 106/108] pwm: Ensure the memory backing a PWM chip isn't freed while used Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 107/108] pwm: Add more locking Uwe Kleine-König
2023-11-21 13:50 ` [PATCH v3 108/108] WIP: pwm: Add support for pwmchip devices for faster and easier userspace access Uwe Kleine-König
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