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linux/drivers/pwm
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David Lechner 4df6f2a167 pwm: axi-pwmgen: fix missing separate external clock 
commit a8841dc3df upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-06-27 11:11:23 +01:00
..
core.c module: Convert default symbol namespace to string literal 2025-02-08 09:57:05 +01:00
Kconfig pwm: adp5585: Add Analog Devices ADP5585 support 2024-08-01 14:09:28 +01:00
Makefile pwm: adp5585: Add Analog Devices ADP5585 support 2024-08-01 14:09:28 +01:00
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: Set OSC_EN bit to 1 when PWM state is enabled 2024-09-16 15:24:58 +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: Switch back to struct platform_driver::remove() 2024-09-16 15:24:59 +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 2025-06-27 11:11:23 +01:00
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: Make use of devm_pwmchip_alloc() function 2024-02-15 12:59:21 +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 2025-02-08 09:57:05 +01:00
pwm-dwc.c pwm: dwc: allow suspend/resume for 16 channels 2024-04-15 17:28:13 +02:00
pwm-dwc.h pwm: dwc: allow suspend/resume for 16 channels 2024-04-15 17:28:13 +02:00
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 2025-04-20 10:15:28 +02:00
pwm-gpio.c pwm: Add GPIO PWM driver 2024-07-10 17:52:47 +02:00
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: Workaround of the pwm output bug when decrease the duty cycle 2024-12-05 14:01:30 +01:00
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-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: lpss: drop redundant runtime PM handles 2024-07-10 17:53:51 +02:00
pwm-lpss-platform.c pwm: lpss: use devm_pm_runtime_enable() helper 2024-07-10 17:53:51 +02:00
pwm-lpss.c module: Convert default symbol namespace to string literal 2025-02-08 09:57:05 +01:00
pwm-lpss.h pwm: lpss-*: Make use of devm_pwmchip_alloc() function 2024-02-19 11:04:11 +01:00
pwm-mediatek.c pwm: mediatek: Prevent divide-by-zero in pwm_mediatek_config() 2025-04-20 10:15:27 +02:00
pwm-meson.c pwm: meson: Add support for Amlogic S4 PWM 2024-07-10 17:52:47 +02:00
pwm-microchip-core.c pwm: microchip-core: fix incorrect comparison with max period 2025-02-17 10:05:29 +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: Drop explicit initialization of struct i2c_device_id::driver_data to 0 2024-05-10 07:30:27 +02:00
pwm-pxa.c pwm: add missing MODULE_DESCRIPTION() macros 2024-07-10 17:52:46 +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 2025-04-20 10:15:27 +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-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-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() 2025-02-08 09:57:06 +01:00
pwm-stm32.c pwm: stm32: Add check for clk_enable() 2025-02-08 09:57:23 +01:00
pwm-stmpe.c pwm: stmpe: Make use of devm_pwmchip_alloc() function 2024-02-22 14:39:25 +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