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Message-ID: <f629be75-4019-4e5c-abcc-45dc8b7e1a8f@collabora.com> Date: Sat, 21 Jun 2025 16:28:42 +0200 From: Michael Riesch <michael.riesch@...labora.com> To: Mehdi Djait <mehdi.djait@...ux.intel.com>, laurent.pinchart@...asonboard.com, sakari.ailus@...ux.intel.com Cc: akinobu.mita@...il.com, stanislaw.gruszka@...ux.intel.com, hdegoede@...hat.com, arnd@...db.de, alain.volmat@...s.st.com, andrzej.hajda@...el.com, benjamin.mugnier@...s.st.com, dave.stevenson@...pberrypi.com, hansg@...nel.org, hverkuil@...all.nl, jacopo.mondi@...asonboard.com, jonas@...boo.se, kieran.bingham@...asonboard.com, khalasa@...p.pl, prabhakar.csengg@...il.com, mani@...nel.org, m.felsch@...gutronix.de, martink@...teo.de, mattwmajewski@...il.com, matthias.fend@...end.at, mchehab@...nel.org, naush@...pberrypi.com, nicholas@...hemail.net, nicolas.dufresne@...labora.com, paul.elder@...asonboard.com, dan.scally@...asonboard.com, pavel@...nel.org, petrcvekcz@...il.com, rashanmu@...il.com, ribalda@...omium.org, rmfrfs@...il.com, zhengsq@...k-chips.com, slongerbeam@...il.com, sylvain.petinot@...s.st.com, s.nawrocki@...sung.com, tomi.valkeinen@...asonboard.com, umang.jain@...asonboard.com, zhi.mao@...iatek.com, linux-kernel@...r.kernel.org, linux-media@...r.kernel.org Subject: Re: [PATCH v1 00/55] media: Add a helper for obtaining the clock producer Hi Mehdi, Thanks for your work! On 6/19/25 19:58, Mehdi Djait wrote: > Hello everyone, > > Here is my v1 for the new helper v4l2_devm_sensor_clk_get() > > Any testing of the patches is GREATLY APPRECIATED! Especially the two > drivers with the special ACPI case: > 1) OV8865 > 2) OV2680 > > > Background > ---------- > > A reference to the clock producer is not available to the kernel > in ACPI-based platforms but the sensor drivers still need them. > > devm_clk_get() will return an error and the probe function will fail. > > > Solution > -------- > > Introduce a generic helper for v4l2 sensor drivers on both DT- and ACPI-based > platforms. Out of curiosity: How is this problem specific to V4L2? Does one need a similar helper in other subsystems? Best regards, Michael > > This helper behaves the same as clk_get_optional() except where there is > no clock producer like in ACPI-based platforms. > > For ACPI-based platforms the function will read the "clock-frequency" > ACPI _DSD property and register a fixed frequency clock with the frequency > indicated in the property. > > > Solution for special ACPI case > ------------------------------ > > This function also handles the special ACPI-based system case where: > > 1) The clock-frequency _DSD property is present. > 2) A reference to the clock producer is present, where the clock is provided > by a camera sensor PMIC driver (e.g. int3472/tps68470.c) > > In this case try to set the clock-frequency value to the provided clock. > > > RFC History > ----------- > > RFC v4 -> RFC v5: > Suggested by Arnd Bergmann: > - removed IS_REACHABLE(CONFIG_COMMON_CLK). IS_REACHABLE() is actually > discouraged [1]. COFIG_COMMON_CLK is a bool, so IS_ENABLED() will be the > right solution here > Suggested by Hans de Goede: > - added handling for the special ACPI-based system case, where > both a reference to the clock-provider and the _DSD > clock-frequency are present. > - updated the function's kernel-doc and the commit msg > to mention this special case. > Link RFC v4: https://lore.kernel.org/linux-media/20250321130329.342236-1-mehdi.djait@linux.intel.com/ > [1] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/Documentation/kbuild/kconfig-language.rst?h=next-20250513&id=700bd25bd4f47a0f4e02e0a25dde05f1a6b16eea > > RFC v3 -> RFC v4: > Suggested by Laurent: > - removed the #ifdef to use IS_REACHABLE(CONFIG_COMMON_CLK) > - changed to kasprintf() to allocate the clk name when id is NULL and > used the __free(kfree) scope-based cleanup helper when > defining the variable to hold the allocated name > Link v3: https://lore.kernel.org/linux-media/20250321093814.18159-1-mehdi.djait@linux.intel.com/ > > RFC v2 -> RFC v3: > - Added #ifdef CONFIG_COMMON_CLK for the ACPI case > Link v2: https://lore.kernel.org/linux-media/20250310122305.209534-1-mehdi.djait@linux.intel.com/ > > RFC v1 -> RFC v2: > Suggested by Sakari: > - removed clk_name > - removed the IS_ERR() check > - improved the kernel-doc comment and commit msg > Link v1: https://lore.kernel.org/linux-media/20250227092643.113939-1-mehdi.djait@linux.intel.com > > Mehdi Djait (55): > media: v4l2-common: Add a helper for obtaining the clock producer > Documentation: media: camera-sensor: Mention > v4l2_devm_sensor_clk_get() for obtaining the clock > media: i2c: ar0521: Use the v4l2 helper for obtaining the clock > media: i2c: ds90ub913: Use the v4l2 helper for obtaining the clock > media: i2c: ds90ub960: Use the v4l2 helper for obtaining the clock > media: i2c: et8ek8: Use the v4l2 helper for obtaining the clock > media: i2c: gc05a2: Use the v4l2 helper for obtaining the clock > media: i2c: gc08a3: Use the v4l2 helper for obtaining the clock > media: i2c: gc2145: Use the v4l2 helper for obtaining the clock > media: i2c: hi846: Use the v4l2 helper for obtaining the clock > media: i2c: imx214: Use the v4l2 helper for obtaining the clock > media: i2c: imx219: Use the v4l2 helper for obtaining the clock > media: i2c: imx283: Use the v4l2 helper for obtaining the clock > media: i2c: imx290: Use the v4l2 helper for obtaining the clock > media: i2c: imx296: Use the v4l2 helper for obtaining the clock > media: i2c: imx334: Use the v4l2 helper for obtaining the clock > media: i2c: imx335: Use the v4l2 helper for obtaining the clock > media: i2c: imx412: Use the v4l2 helper for obtaining the clock > media: i2c: imx415: Use the v4l2 helper for obtaining the clock > media: i2c: max2175: Use the v4l2 helper for obtaining the clock > media: i2c: mt9m001: Use the v4l2 helper for obtaining the clock > media: i2c: mt9m111: Use the v4l2 helper for obtaining the clock > media: i2c: mt9m114: Use the v4l2 helper for obtaining the clock > media: i2c: mt9p031: Use the v4l2 helper for obtaining the clock > media: i2c: mt9t112: Use the v4l2 helper for obtaining the clock > media: i2c: mt9v032: Use the v4l2 helper for obtaining the clock > media: i2c: mt9v111: Use the v4l2 helper for obtaining the clock > media: i2c: ov02a10: Use the v4l2 helper for obtaining the clock > media: i2c: ov2659: Use the v4l2 helper for obtaining the clock > media: i2c: ov2685: Use the v4l2 helper for obtaining the clock > media: i2c: ov5640: Use the v4l2 helper for obtaining the clock > media: i2c: ov5645: Use the v4l2 helper for obtaining the clock > media: i2c: ov5647: Use the v4l2 helper for obtaining the clock > media: i2c: ov5648: Use the v4l2 helper for obtaining the clock > media: i2c: ov5695: Use the v4l2 helper for obtaining the clock > media: i2c: ov64a40: Use the v4l2 helper for obtaining the clock > media: i2c: ov6650: Use the v4l2 helper for obtaining the clock > media: i2c: ov7740: Use the v4l2 helper for obtaining the clock > media: i2c: ov8856: Use the v4l2 helper for obtaining the clock > media: i2c: ov8858: Use the v4l2 helper for obtaining the clock > media: i2c: ov8865: Use the v4l2 helper for obtaining the clock > media: i2c: ov9282: Use the v4l2 helper for obtaining the clock > media: i2c: ov9640: Use the v4l2 helper for obtaining the clock > media: i2c: ov9650: Use the v4l2 helper for obtaining the clock > media: i2c: s5c73m3: Use the v4l2 helper for obtaining the clock > media: i2c: s5k5baf: Use the v4l2 helper for obtaining the clock > media: i2c: s5k6a3: Use the v4l2 helper for obtaining the clock > media: i2c: st-mipid02: Use the v4l2 helper for obtaining the clock > media: i2c: tc358743: Use the v4l2 helper for obtaining the clock > media: i2c: tc358746: Use the v4l2 helper for obtaining the clock > media: i2c: thp7312: Use the v4l2 helper for obtaining the clock > media: i2c: vd55g1: Use the v4l2 helper for obtaining the clock > media: i2c: vd56g3: Use the v4l2 helper for obtaining the clock > media: i2c: vgxy61: Use the v4l2 helper for obtaining the clock > media: i2c: ov2680: Use the v4l2 helper for obtaining the clock > > .../driver-api/media/camera-sensor.rst | 3 +- > drivers/media/i2c/ar0521.c | 2 +- > drivers/media/i2c/ds90ub913.c | 2 +- > drivers/media/i2c/ds90ub960.c | 2 +- > drivers/media/i2c/et8ek8/et8ek8_driver.c | 2 +- > drivers/media/i2c/gc05a2.c | 2 +- > drivers/media/i2c/gc08a3.c | 2 +- > drivers/media/i2c/gc2145.c | 2 +- > drivers/media/i2c/hi846.c | 2 +- > drivers/media/i2c/imx214.c | 2 +- > drivers/media/i2c/imx219.c | 2 +- > drivers/media/i2c/imx283.c | 2 +- > drivers/media/i2c/imx290.c | 2 +- > drivers/media/i2c/imx296.c | 2 +- > drivers/media/i2c/imx334.c | 2 +- > drivers/media/i2c/imx335.c | 2 +- > drivers/media/i2c/imx412.c | 2 +- > drivers/media/i2c/imx415.c | 2 +- > drivers/media/i2c/max2175.c | 2 +- > drivers/media/i2c/mt9m001.c | 2 +- > drivers/media/i2c/mt9m111.c | 2 +- > drivers/media/i2c/mt9m114.c | 2 +- > drivers/media/i2c/mt9p031.c | 2 +- > drivers/media/i2c/mt9t112.c | 2 +- > drivers/media/i2c/mt9v032.c | 2 +- > drivers/media/i2c/mt9v111.c | 2 +- > drivers/media/i2c/ov02a10.c | 2 +- > drivers/media/i2c/ov2659.c | 2 +- > drivers/media/i2c/ov2680.c | 27 +++------- > drivers/media/i2c/ov2685.c | 2 +- > drivers/media/i2c/ov5640.c | 2 +- > drivers/media/i2c/ov5645.c | 2 +- > drivers/media/i2c/ov5647.c | 2 +- > drivers/media/i2c/ov5648.c | 2 +- > drivers/media/i2c/ov5695.c | 2 +- > drivers/media/i2c/ov64a40.c | 2 +- > drivers/media/i2c/ov6650.c | 2 +- > drivers/media/i2c/ov7740.c | 2 +- > drivers/media/i2c/ov8856.c | 2 +- > drivers/media/i2c/ov8858.c | 2 +- > drivers/media/i2c/ov8865.c | 32 ++---------- > drivers/media/i2c/ov9282.c | 2 +- > drivers/media/i2c/ov9640.c | 2 +- > drivers/media/i2c/ov9650.c | 2 +- > drivers/media/i2c/s5c73m3/s5c73m3-core.c | 2 +- > drivers/media/i2c/s5k5baf.c | 2 +- > drivers/media/i2c/s5k6a3.c | 2 +- > drivers/media/i2c/st-mipid02.c | 2 +- > drivers/media/i2c/tc358743.c | 2 +- > drivers/media/i2c/tc358746.c | 2 +- > drivers/media/i2c/thp7312.c | 2 +- > drivers/media/i2c/vd55g1.c | 2 +- > drivers/media/i2c/vd56g3.c | 2 +- > drivers/media/i2c/vgxy61.c | 2 +- > drivers/media/v4l2-core/v4l2-common.c | 49 +++++++++++++++++++ > include/media/v4l2-common.h | 25 ++++++++++ > 56 files changed, 136 insertions(+), 102 deletions(-) >
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