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a8841dc3df
linux/drivers/pwm
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David Lechner a8841dc3df pwm: axi-pwmgen: fix missing separate external clock 
Add proper support for external clock to the AXI PWM generator driver.

In most cases, the HDL for this IP block is compiled with the default
ASYNC_CLK_EN=1. With this option, there is a separate external clock
that drives the PWM output separate from the peripheral clock. So the
driver should be enabling the "axi" clock to power the peripheral and
the "ext" clock to drive the PWM output.

When ASYNC_CLK_EN=0, the "axi" clock is also used to drive the PWM
output and there is no "ext" clock.

Previously, if there was a separate external clock, users had to specify
only the external clock and (incorrectly) omit the AXI clock in order
to get the correct operating frequency for the PWM output.

The devicetree bindings are updated to fix this shortcoming and this
patch changes the driver to match the new bindings. To preserve
compatibility with any existing dtbs that specify only one clock, we
don't require the clock name on the first clock.

Fixes: 41814fe5c7 ("pwm: Add driver for AXI PWM generator")
Cc: stable@vger.kernel.org
Acked-by: Nuno Sá <nuno.sa@analog.com>
Reviewed-by: Trevor Gamblin <tgamblin@baylibre.com>
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://lore.kernel.org/r/20250529-pwm-axi-pwmgen-add-external-clock-v3-3-5d8809a7da91@baylibre.com
Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
2025-06-02 18:23:33 +02:00
..
core.c pwm: Formally describe the procedure used to pick a hardware waveform setting 2025-05-07 11:48:35 +02:00
Kconfig pwm: Tidyup PWM menu for Renesas 2025-05-14 10:20:55 +02:00
Makefile pwm: Tidyup PWM menu for Renesas 2025-05-14 10:20:55 +02:00
pwm-ab8500.c pwm: ab8500: Make use of devm_pwmchip_alloc() function 2024-02-15 12:59:19 +01:00
pwm-adp5585.c pwm: adp5585: make sure to include mod_devicetable.h 2025-05-19 18:07:39 +02:00
pwm-apple.c pwm: apple: Make use of devm_pwmchip_alloc() function 2024-02-15 12:59:19 +01:00
pwm-atmel-hlcdc.c pwm: Switch back to struct platform_driver::remove() 2024-09-16 15:24:59 +02:00
pwm-atmel-tcb.c pwm: atmel-tcb: Use min() macro 2024-10-25 11:33:34 +02:00
pwm-atmel.c pwm: atmel: Make use of devm_pwmchip_alloc() function 2024-02-15 12:59:19 +01:00
pwm-axi-pwmgen.c pwm: axi-pwmgen: fix missing separate external clock 2025-06-02 18:23:33 +02:00
pwm-bcm-iproc.c pwm: bcm-iproc: Make use of devm_pwmchip_alloc() function 2024-02-15 12:59:20 +01:00
pwm-bcm-kona.c pwm: bcm-kona: Make use of devm_pwmchip_alloc() function 2024-02-15 12:59:20 +01:00
pwm-bcm2835.c pwm: bcm2835: Drop open coded variant of devm_clk_rate_exclusive_get() 2024-04-30 18:57:08 +02:00
pwm-berlin.c pwm: berlin: Make use of devm_pwmchip_alloc() function 2024-02-15 12:59:20 +01:00
pwm-brcmstb.c pwm: brcmstb: Make use of devm_pwmchip_alloc() function 2024-02-15 12:59:20 +01:00
pwm-clk.c pwm: Switch back to struct platform_driver::remove() 2024-09-16 15:24:59 +02:00
pwm-clps711x.c pwm: clps711x: Drop of_match_ptr() usage for .of_match_table 2025-02-15 15:40:26 +01:00
pwm-crc.c pwm: crc: Make use of devm_pwmchip_alloc() function 2024-02-15 12:59:21 +01:00
pwm-cros-ec.c pwm: cros-ec: Simplify device tree xlation 2024-07-10 17:52:47 +02:00
pwm-dwc-core.c module: Convert default symbol namespace to string literal 2024-12-03 08:22:25 -08:00
pwm-dwc.c pwm: Replace deprecated PCI functions 2024-12-18 11:12:05 +01:00
pwm-dwc.h module: Convert symbol namespace to string literal 2024-12-02 11:34:44 -08:00
pwm-ep93xx.c pwm: ep93xx: drop legacy pinctrl 2024-09-12 14:33:11 +00:00
pwm-fsl-ftm.c pwm: fsl-ftm: Handle clk_get_rate() returning 0 2025-04-04 09:23:56 +02:00
pwm-gpio.c pwm: gpio: Switch to use hrtimer_setup() 2025-02-07 16:41:37 +01:00
pwm-hibvt.c pwm: Switch back to struct platform_driver::remove() 2024-09-16 15:24:59 +02:00
pwm-img.c pwm: Switch back to struct platform_driver::remove() 2024-09-16 15:24:59 +02:00
pwm-imx-tpm.c pwm: imx-tpm: Use correct MODULO value for EPWM mode 2024-10-25 11:29:17 +02:00
pwm-imx1.c pwm: add missing MODULE_DESCRIPTION() macros 2024-07-10 17:52:46 +02:00
pwm-imx27.c pwm: imx27: Use clk_bulk_*() API to simplify clock handling 2024-10-25 11:42:36 +02:00
pwm-intel-lgm.c pwm: add missing MODULE_DESCRIPTION() macros 2024-07-10 17:52:46 +02:00
pwm-iqs620a.c pwm: iqs620a: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:10 +01:00
pwm-jz4740.c pwm: jz4740: Another few conversions to regmap_{set,clear}_bits() 2024-07-10 17:52:46 +02:00
pwm-keembay.c pwm: keembay: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:10 +01:00
pwm-loongson.c pwm: loongson: Fix an error code in probe() 2025-04-17 11:51:29 +02:00
pwm-lp3943.c pwm: lp3943: Fix an incorrect type in lp3943_pwm_parse_dt() 2024-09-16 15:23:36 +02:00
pwm-lpc18xx-sct.c pwm: Switch back to struct platform_driver::remove() 2024-09-16 15:24:59 +02:00
pwm-lpc32xx.c pwm: lpc32xx: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:11 +01:00
pwm-lpss-pci.c pwm: Changes for v6.14-rc1 2025-01-22 10:43:09 -08:00
pwm-lpss-platform.c module: Convert symbol namespace to string literal 2024-12-02 11:34:44 -08:00
pwm-lpss.c Pin control changes for the v6.15 kernel cycle: 2025-03-29 16:59:16 -07:00
pwm-lpss.h pwm: lpss: Only include <linux/pwm.h> where needed 2025-02-04 08:23:42 +01:00
pwm-mc33xs2410.c pwm: add support for NXPs high-side switch MC33XS2410 2025-05-02 18:39:21 +02:00
pwm-mediatek.c pwm: mediatek: Prevent divide-by-zero in pwm_mediatek_config() 2025-04-02 18:31:42 +02:00
pwm-meson.c pwm: meson: Simplify meson_pwm_cnt_to_ns() 2025-04-14 08:03:15 +02:00
pwm-microchip-core.c pwm: microchip-core: fix incorrect comparison with max period 2025-01-23 16:14:09 +01:00
pwm-mtk-disp.c pwm: mtk-disp: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:12 +01:00
pwm-mxs.c pwm: mxs: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:12 +01:00
pwm-ntxec.c pwm: ntxec: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:12 +01:00
pwm-omap-dmtimer.c pwm: Switch back to struct platform_driver::remove() 2024-09-16 15:24:59 +02:00
pwm-pca9685.c pwm: pca9685: Use new GPIO line value setter callbacks 2025-04-14 08:03:16 +02:00
pwm-pxa.c pwm: pxa: Improve using dev_err_probe() 2025-04-14 08:03:16 +02:00
pwm-raspberrypi-poe.c pwm: raspberrypi-poe: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:13 +01:00
pwm-rcar.c pwm: rcar: Improve register calculation 2025-04-04 09:23:39 +02:00
pwm-renesas-tpu.c pwm: renesas-tpu: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:13 +01:00
pwm-rockchip.c pwm: Switch back to struct platform_driver::remove() 2024-09-16 15:24:59 +02:00
pwm-rz-mtu3.c pwm: rz-mtu3: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:14 +01:00
pwm-rzg2l-gpt.c pwm: rzg2l-gpt: Accept requests for too high period length 2025-04-30 09:01:03 +02:00
pwm-samsung.c of: remove internal arguments from of_property_for_each_u32() 2024-07-25 06:53:47 -05:00
pwm-sifive.c pwm: Switch back to struct platform_driver::remove() 2024-09-16 15:24:59 +02:00
pwm-sl28cpld.c pwm: sl28cpld: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:15 +01:00
pwm-sophgo-sg2042.c pwm: sophgo: add driver for Sophgo SG2042 PWM 2025-02-05 11:06:38 +01:00
pwm-spear.c pwm: add missing MODULE_DESCRIPTION() macros 2024-07-10 17:52:46 +02:00
pwm-sprd.c pwm: sprd: Make use of devm_pwmchip_alloc() function 2024-02-22 14:39:10 +01:00
pwm-sti.c pwm: sti: Prefer local variable over pointer dereference 2024-04-26 21:29:17 +02:00
pwm-stm32-lp.c pwm: stm32-lp: Add check for clk_enable() 2024-12-18 11:12:05 +01:00
pwm-stm32.c pwm: stm32: Emit debug output also for corner cases of the rounding callbacks 2025-04-14 08:03:16 +02:00
pwm-stmpe.c pwm: stmpe: Allow to compile as a module 2025-03-03 10:38:54 +01:00
pwm-sun4i.c pwm: Switch back to struct platform_driver::remove() 2024-09-16 15:24:59 +02:00
pwm-sunplus.c pwm: sunplus: Make use of devm_pwmchip_alloc() function 2024-02-22 14:39:25 +01:00
pwm-tegra.c pwm: Switch back to struct platform_driver::remove() 2024-09-16 15:24:59 +02:00
pwm-tiecap.c pwm: Switch back to struct platform_driver::remove() 2024-09-16 15:24:59 +02:00
pwm-tiehrpwm.c pwm: Switch back to struct platform_driver::remove() 2024-09-16 15:24:59 +02:00
pwm-twl-led.c pwm: twl-led: Make use of devm_pwmchip_alloc() function 2024-02-22 14:39:27 +01:00
pwm-twl.c pwm: twl: Make use of devm_pwmchip_alloc() function 2024-02-22 14:39:27 +01:00
pwm-visconti.c pwm: add missing MODULE_DESCRIPTION() macros 2024-07-10 17:52:46 +02:00
pwm-vt8500.c pwm: vt8500: Make use of devm_pwmchip_alloc() function 2024-02-22 14:39:27 +01:00
pwm-xilinx.c pwm: xilinx: Simplify using devm_ functions 2024-07-10 17:53:52 +02:00