* [PATCH v6 0/2] Clock based PWM output driver @ 2022-02-20 11:50 Nikita Travkin 2022-02-20 11:50 ` [PATCH v6 1/2] dt-bindings: pwm: Document clk based PWM controller Nikita Travkin 2022-02-20 11:50 ` [PATCH v6 2/2] pwm: Add clock based PWM output driver Nikita Travkin 0 siblings, 2 replies; 6+ messages in thread From: Nikita Travkin @ 2022-02-20 11:50 UTC (permalink / raw) To: thierry.reding, lee.jones Cc: u.kleine-koenig, robh+dt, sboyd, krzk, linus.walleij, masneyb, sean.anderson, linux-pwm, devicetree, linux-kernel, ~postmarketos/upstreaming, Nikita Travkin This series introduces an "adapter" driver that allows PWM consumers to control clock outputs with duty-cycle control. Some platforms (e.g. some Qualcomm chipsets) have "General Purpose" clocks that can be muxed to GPIO outputs and used as PWM outputs. Those outputs may be connected to various peripherals such as leds in display backlight or haptic feedback motor driver. To avoid re-implementing every single PWM consumer driver with clk support (like in [1]) and don't put the burden of providing the PWM sources on the clock drivers (as was proposed in [2]), clk based pwm controller driver is introduced. There is an existing driver that provides the opposite function in drivers/clk/clk-pwm.c with a compatible "pwm-clock" so the new driver uses the opposite naming scheme: drivers/pwm/pwm-clk.c and compatible "clk-pwm". Changes in v2: - Fix filename in the DT schema. - Address Uwe's review comments. Changes in v3: - Fix node pattern in the core pwm schema. - Address Uwe's review comments. Changes in v4: - Drop the (incorrect) pwm schema change. - Use generic node name in the dt bindings example. Changes in v5: - Correct required properties. - add missed returns. Changes in v6: - Add missed error cleanup - Adjust limitations comment Nikita Travkin (2): dt-bindings: pwm: Document clk based PWM controller pwm: Add clock based PWM output driver .../devicetree/bindings/pwm/clk-pwm.yaml | 46 ++++++ drivers/pwm/Kconfig | 10 ++ drivers/pwm/Makefile | 1 + drivers/pwm/pwm-clk.c | 139 ++++++++++++++++++ 4 files changed, 196 insertions(+) create mode 100644 Documentation/devicetree/bindings/pwm/clk-pwm.yaml create mode 100644 drivers/pwm/pwm-clk.c -- 2.34.1 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH v6 1/2] dt-bindings: pwm: Document clk based PWM controller 2022-02-20 11:50 [PATCH v6 0/2] Clock based PWM output driver Nikita Travkin @ 2022-02-20 11:50 ` Nikita Travkin 2022-02-23 15:56 ` Rob Herring 2022-02-20 11:50 ` [PATCH v6 2/2] pwm: Add clock based PWM output driver Nikita Travkin 1 sibling, 1 reply; 6+ messages in thread From: Nikita Travkin @ 2022-02-20 11:50 UTC (permalink / raw) To: thierry.reding, lee.jones Cc: u.kleine-koenig, robh+dt, sboyd, krzk, linus.walleij, masneyb, sean.anderson, linux-pwm, devicetree, linux-kernel, ~postmarketos/upstreaming, Nikita Travkin, Krzysztof Kozlowski Add YAML devicetree binding for clk based PWM controller Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by: Nikita Travkin <nikita@trvn.ru> -- Changes in v2: - fix the file name. Changes in v4: - Use generic node name in the dt bindings example. Changes in v5: - make compatible required --- .../devicetree/bindings/pwm/clk-pwm.yaml | 46 +++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 Documentation/devicetree/bindings/pwm/clk-pwm.yaml diff --git a/Documentation/devicetree/bindings/pwm/clk-pwm.yaml b/Documentation/devicetree/bindings/pwm/clk-pwm.yaml new file mode 100644 index 000000000000..ec1768291503 --- /dev/null +++ b/Documentation/devicetree/bindings/pwm/clk-pwm.yaml @@ -0,0 +1,46 @@ +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/pwm/clk-pwm.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Clock based PWM controller + +maintainers: + - Nikita Travkin <nikita@trvn.ru> + +description: | + Some systems have clocks that can be exposed to external devices. + (e.g. by muxing them to GPIO pins) + It's often possible to control duty-cycle of such clocks which makes them + suitable for generating PWM signal. + +allOf: + - $ref: pwm.yaml# + +properties: + compatible: + const: clk-pwm + + clocks: + description: Clock used to generate the signal. + maxItems: 1 + + "#pwm-cells": + const: 2 + +unevaluatedProperties: false + +required: + - compatible + - clocks + +examples: + - | + pwm { + compatible = "clk-pwm"; + #pwm-cells = <2>; + clocks = <&gcc 0>; + pinctrl-names = "default"; + pinctrl-0 = <&pwm_clk_flash_default>; + }; -- 2.34.1 ^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH v6 1/2] dt-bindings: pwm: Document clk based PWM controller 2022-02-20 11:50 ` [PATCH v6 1/2] dt-bindings: pwm: Document clk based PWM controller Nikita Travkin @ 2022-02-23 15:56 ` Rob Herring 0 siblings, 0 replies; 6+ messages in thread From: Rob Herring @ 2022-02-23 15:56 UTC (permalink / raw) To: Nikita Travkin Cc: u.kleine-koenig, linux-kernel, thierry.reding, masneyb, sean.anderson, devicetree, ~postmarketos/upstreaming, linux-pwm, Krzysztof Kozlowski, lee.jones, linus.walleij, krzk, sboyd, robh+dt On Sun, 20 Feb 2022 16:50:29 +0500, Nikita Travkin wrote: > Add YAML devicetree binding for clk based PWM controller > > Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> > Signed-off-by: Nikita Travkin <nikita@trvn.ru> > -- > Changes in v2: > - fix the file name. > Changes in v4: > - Use generic node name in the dt bindings example. > Changes in v5: > - make compatible required > --- > .../devicetree/bindings/pwm/clk-pwm.yaml | 46 +++++++++++++++++++ > 1 file changed, 46 insertions(+) > create mode 100644 Documentation/devicetree/bindings/pwm/clk-pwm.yaml > Reviewed-by: Rob Herring <robh@kernel.org> ^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH v6 2/2] pwm: Add clock based PWM output driver 2022-02-20 11:50 [PATCH v6 0/2] Clock based PWM output driver Nikita Travkin 2022-02-20 11:50 ` [PATCH v6 1/2] dt-bindings: pwm: Document clk based PWM controller Nikita Travkin @ 2022-02-20 11:50 ` Nikita Travkin 2022-03-28 10:56 ` Uwe Kleine-König 1 sibling, 1 reply; 6+ messages in thread From: Nikita Travkin @ 2022-02-20 11:50 UTC (permalink / raw) To: thierry.reding, lee.jones Cc: u.kleine-koenig, robh+dt, sboyd, krzk, linus.walleij, masneyb, sean.anderson, linux-pwm, devicetree, linux-kernel, ~postmarketos/upstreaming, Nikita Travkin Some systems have clocks exposed to external devices. If the clock controller supports duty-cycle configuration, such clocks can be used as pwm outputs. In fact PWM and CLK subsystems are interfaced with in a similar way and an "opposite" driver already exists (clk-pwm). Add a driver that would enable pwm devices to be used via clk subsystem. Signed-off-by: Nikita Travkin <nikita@trvn.ru> -- Changes in v2: - Address Uwe's review comments: - Round set clk rate up - Add a description with limitations of the driver - Disable and unprepare clock before removing pwmchip Changes in v3: - Use 64bit version of div round up - Address Uwe's review comments: - Reword the limitations to avoid incorrect claims - Move the clk_enabled flag assignment - Drop unnecessary statements Changes in v5: - add missed returns Changes in v6: - Unprepare the clock on error - Drop redundant limitations points --- drivers/pwm/Kconfig | 10 +++ drivers/pwm/Makefile | 1 + drivers/pwm/pwm-clk.c | 139 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 150 insertions(+) create mode 100644 drivers/pwm/pwm-clk.c diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig index 21e3b05a5153..daa2491a4054 100644 --- a/drivers/pwm/Kconfig +++ b/drivers/pwm/Kconfig @@ -140,6 +140,16 @@ config PWM_BRCMSTB To compile this driver as a module, choose M Here: the module will be called pwm-brcmstb.c. +config PWM_CLK + tristate "Clock based PWM support" + depends on HAVE_CLK || COMPILE_TEST + help + Generic PWM framework driver for outputs that can be + muxed to clocks. + + To compile this driver as a module, choose M here: the module + will be called pwm-clk. + config PWM_CLPS711X tristate "CLPS711X PWM support" depends on ARCH_CLPS711X || COMPILE_TEST diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile index 708840b7fba8..4a860103c470 100644 --- a/drivers/pwm/Makefile +++ b/drivers/pwm/Makefile @@ -10,6 +10,7 @@ obj-$(CONFIG_PWM_BCM_KONA) += pwm-bcm-kona.o obj-$(CONFIG_PWM_BCM2835) += pwm-bcm2835.o obj-$(CONFIG_PWM_BERLIN) += pwm-berlin.o obj-$(CONFIG_PWM_BRCMSTB) += pwm-brcmstb.o +obj-$(CONFIG_PWM_CLK) += pwm-clk.o obj-$(CONFIG_PWM_CLPS711X) += pwm-clps711x.o obj-$(CONFIG_PWM_CRC) += pwm-crc.o obj-$(CONFIG_PWM_CROS_EC) += pwm-cros-ec.o diff --git a/drivers/pwm/pwm-clk.c b/drivers/pwm/pwm-clk.c new file mode 100644 index 000000000000..52c9923368cb --- /dev/null +++ b/drivers/pwm/pwm-clk.c @@ -0,0 +1,139 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Clock based PWM controller + * + * Copyright (c) 2021 Nikita Travkin <nikita@trvn.ru> + * + * This is an "adapter" driver that allows PWM consumers to use + * system clocks with duty cycle control as PWM outputs. + * + * Limitations: + * - Due to the fact that exact behavior depends on the underlying + * clock driver, various limitations are possible. + * - Underlying clock may not be able to give 0% or 100% duty cycle + * (constant off or on), exact behavior will depend on the clock. + * - When the PWM is disabled, the clock will be disabled as well, + * line state will depend on the clock. + */ + +#include <linux/kernel.h> +#include <linux/math64.h> +#include <linux/err.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/clk.h> +#include <linux/pwm.h> + +struct pwm_clk_chip { + struct pwm_chip chip; + struct clk *clk; + bool clk_enabled; +}; + +#define to_pwm_clk_chip(_chip) container_of(_chip, struct pwm_clk_chip, chip) + +static int pwm_clk_apply(struct pwm_chip *pwm_chip, struct pwm_device *pwm, + const struct pwm_state *state) +{ + struct pwm_clk_chip *chip = to_pwm_clk_chip(pwm_chip); + int ret; + u32 rate; + u64 period = state->period; + u64 duty_cycle = state->duty_cycle; + + if (!state->enabled) { + if (pwm->state.enabled) { + clk_disable(chip->clk); + chip->clk_enabled = false; + } + return 0; + } else if (!pwm->state.enabled) { + ret = clk_enable(chip->clk); + if (ret) + return ret; + chip->clk_enabled = true; + } + + rate = DIV64_U64_ROUND_UP(NSEC_PER_SEC, period); + ret = clk_set_rate(chip->clk, rate); + if (ret) + return ret; + + if (state->polarity == PWM_POLARITY_INVERSED) + duty_cycle = period - duty_cycle; + + return clk_set_duty_cycle(chip->clk, duty_cycle, period); +} + +static const struct pwm_ops pwm_clk_ops = { + .apply = pwm_clk_apply, + .owner = THIS_MODULE, +}; + +static int pwm_clk_probe(struct platform_device *pdev) +{ + struct pwm_clk_chip *chip; + int ret; + + chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + chip->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(chip->clk)) + return dev_err_probe(&pdev->dev, PTR_ERR(chip->clk), + "Failed to get clock\n"); + + chip->chip.dev = &pdev->dev; + chip->chip.ops = &pwm_clk_ops; + chip->chip.npwm = 1; + + ret = clk_prepare(chip->clk); + if (ret < 0) + return dev_err_probe(&pdev->dev, ret, "Failed to prepare clock\n"); + + ret = pwmchip_add(&chip->chip); + if (ret < 0) { + clk_unprepare(chip->clk); + return dev_err_probe(&pdev->dev, ret, "Failed to add pwm chip\n"); + } + + platform_set_drvdata(pdev, chip); + return 0; +} + +static int pwm_clk_remove(struct platform_device *pdev) +{ + struct pwm_clk_chip *chip = platform_get_drvdata(pdev); + + pwmchip_remove(&chip->chip); + + if (chip->clk_enabled) + clk_disable(chip->clk); + + clk_unprepare(chip->clk); + + return 0; +} + +static const struct of_device_id pwm_clk_dt_ids[] = { + { .compatible = "clk-pwm", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, pwm_clk_dt_ids); + +static struct platform_driver pwm_clk_driver = { + .driver = { + .name = "pwm-clk", + .of_match_table = pwm_clk_dt_ids, + }, + .probe = pwm_clk_probe, + .remove = pwm_clk_remove, +}; +module_platform_driver(pwm_clk_driver); + +MODULE_ALIAS("platform:pwm-clk"); +MODULE_AUTHOR("Nikita Travkin <nikita@trvn.ru>"); +MODULE_DESCRIPTION("Clock based PWM driver"); +MODULE_LICENSE("GPL"); -- 2.34.1 ^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH v6 2/2] pwm: Add clock based PWM output driver 2022-02-20 11:50 ` [PATCH v6 2/2] pwm: Add clock based PWM output driver Nikita Travkin @ 2022-03-28 10:56 ` Uwe Kleine-König 2022-04-02 6:59 ` Nikita Travkin 0 siblings, 1 reply; 6+ messages in thread From: Uwe Kleine-König @ 2022-03-28 10:56 UTC (permalink / raw) To: Nikita Travkin Cc: thierry.reding, lee.jones, robh+dt, sboyd, krzk, linus.walleij, masneyb, sean.anderson, linux-pwm, devicetree, linux-kernel, ~postmarketos/upstreaming, kernel [-- Attachment #1: Type: text/plain, Size: 4494 bytes --] Hello, just a few minor things left to criticize, see below. On Sun, Feb 20, 2022 at 04:50:30PM +0500, Nikita Travkin wrote: > Some systems have clocks exposed to external devices. If the clock > controller supports duty-cycle configuration, such clocks can be used as > pwm outputs. In fact PWM and CLK subsystems are interfaced with in a > similar way and an "opposite" driver already exists (clk-pwm). Add a > driver that would enable pwm devices to be used via clk subsystem. > > Signed-off-by: Nikita Travkin <nikita@trvn.ru> > -- > > Changes in v2: > - Address Uwe's review comments: > - Round set clk rate up > - Add a description with limitations of the driver > - Disable and unprepare clock before removing pwmchip > Changes in v3: > - Use 64bit version of div round up > - Address Uwe's review comments: > - Reword the limitations to avoid incorrect claims > - Move the clk_enabled flag assignment > - Drop unnecessary statements > Changes in v5: > - add missed returns > Changes in v6: > - Unprepare the clock on error > - Drop redundant limitations points > --- > drivers/pwm/Kconfig | 10 +++ > drivers/pwm/Makefile | 1 + > drivers/pwm/pwm-clk.c | 139 ++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 150 insertions(+) > create mode 100644 drivers/pwm/pwm-clk.c > > diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig > index 21e3b05a5153..daa2491a4054 100644 > --- a/drivers/pwm/Kconfig > +++ b/drivers/pwm/Kconfig > @@ -140,6 +140,16 @@ config PWM_BRCMSTB > To compile this driver as a module, choose M Here: the module > will be called pwm-brcmstb.c. > > +config PWM_CLK > + tristate "Clock based PWM support" > + depends on HAVE_CLK || COMPILE_TEST Can you really compile this driver if HAVE_CLK isn't available? > + help > + Generic PWM framework driver for outputs that can be > + muxed to clocks. > + > + To compile this driver as a module, choose M here: the module > + will be called pwm-clk. > + > config PWM_CLPS711X > tristate "CLPS711X PWM support" > depends on ARCH_CLPS711X || COMPILE_TEST > diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile > index 708840b7fba8..4a860103c470 100644 > --- a/drivers/pwm/Makefile > +++ b/drivers/pwm/Makefile > @@ -10,6 +10,7 @@ obj-$(CONFIG_PWM_BCM_KONA) += pwm-bcm-kona.o > obj-$(CONFIG_PWM_BCM2835) += pwm-bcm2835.o > obj-$(CONFIG_PWM_BERLIN) += pwm-berlin.o > obj-$(CONFIG_PWM_BRCMSTB) += pwm-brcmstb.o > +obj-$(CONFIG_PWM_CLK) += pwm-clk.o > obj-$(CONFIG_PWM_CLPS711X) += pwm-clps711x.o > obj-$(CONFIG_PWM_CRC) += pwm-crc.o > obj-$(CONFIG_PWM_CROS_EC) += pwm-cros-ec.o > diff --git a/drivers/pwm/pwm-clk.c b/drivers/pwm/pwm-clk.c > new file mode 100644 > index 000000000000..52c9923368cb > --- /dev/null > +++ b/drivers/pwm/pwm-clk.c > @@ -0,0 +1,139 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Clock based PWM controller > + * > + * Copyright (c) 2021 Nikita Travkin <nikita@trvn.ru> > + * > + * This is an "adapter" driver that allows PWM consumers to use > + * system clocks with duty cycle control as PWM outputs. > + * > + * Limitations: > + * - Due to the fact that exact behavior depends on the underlying > + * clock driver, various limitations are possible. > + * - Underlying clock may not be able to give 0% or 100% duty cycle > + * (constant off or on), exact behavior will depend on the clock. > + * - When the PWM is disabled, the clock will be disabled as well, > + * line state will depend on the clock. - The clk API doesn't expose the necessary calls to implement .get_state(). > + */ > + > +#include <linux/kernel.h> > +#include <linux/math64.h> > +#include <linux/err.h> > +#include <linux/module.h> > +#include <linux/of.h> > +#include <linux/platform_device.h> > +#include <linux/clk.h> > +#include <linux/pwm.h> > + > +struct pwm_clk_chip { > + struct pwm_chip chip; > + struct clk *clk; > + bool clk_enabled; > +}; > + > +#define to_pwm_clk_chip(_chip) container_of(_chip, struct pwm_clk_chip, chip) > + > +static int pwm_clk_apply(struct pwm_chip *pwm_chip, struct pwm_device *pwm, > + const struct pwm_state *state) > +{ > + struct pwm_clk_chip *chip = to_pwm_clk_chip(pwm_chip); I'd prefer this was not called chip, as this is how struct pwm_chip variables are called usually. My suggestion is: chip -> pcchip pwm_chip -> chip Best regards Uwe [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 488 bytes --] ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v6 2/2] pwm: Add clock based PWM output driver 2022-03-28 10:56 ` Uwe Kleine-König @ 2022-04-02 6:59 ` Nikita Travkin 0 siblings, 0 replies; 6+ messages in thread From: Nikita Travkin @ 2022-04-02 6:59 UTC (permalink / raw) To: Uwe Kleine-König Cc: thierry.reding, lee.jones, robh+dt, sboyd, krzk, linus.walleij, masneyb, sean.anderson, linux-pwm, devicetree, linux-kernel, ~postmarketos/upstreaming, kernel Hi, Uwe Kleine-König писал(а) 28.03.2022 15:56: > Hello, > > just a few minor things left to criticize, see below. > > On Sun, Feb 20, 2022 at 04:50:30PM +0500, Nikita Travkin wrote: >> Some systems have clocks exposed to external devices. If the clock >> controller supports duty-cycle configuration, such clocks can be used as >> pwm outputs. In fact PWM and CLK subsystems are interfaced with in a >> similar way and an "opposite" driver already exists (clk-pwm). Add a >> driver that would enable pwm devices to be used via clk subsystem. >> >> Signed-off-by: Nikita Travkin <nikita@trvn.ru> >> -- >> >> Changes in v2: >> - Address Uwe's review comments: >> - Round set clk rate up >> - Add a description with limitations of the driver >> - Disable and unprepare clock before removing pwmchip >> Changes in v3: >> - Use 64bit version of div round up >> - Address Uwe's review comments: >> - Reword the limitations to avoid incorrect claims >> - Move the clk_enabled flag assignment >> - Drop unnecessary statements >> Changes in v5: >> - add missed returns >> Changes in v6: >> - Unprepare the clock on error >> - Drop redundant limitations points >> --- >> drivers/pwm/Kconfig | 10 +++ >> drivers/pwm/Makefile | 1 + >> drivers/pwm/pwm-clk.c | 139 ++++++++++++++++++++++++++++++++++++++++++ >> 3 files changed, 150 insertions(+) >> create mode 100644 drivers/pwm/pwm-clk.c >> >> diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig >> index 21e3b05a5153..daa2491a4054 100644 >> --- a/drivers/pwm/Kconfig >> +++ b/drivers/pwm/Kconfig >> @@ -140,6 +140,16 @@ config PWM_BRCMSTB >> To compile this driver as a module, choose M Here: the module >> will be called pwm-brcmstb.c. >> >> +config PWM_CLK >> + tristate "Clock based PWM support" >> + depends on HAVE_CLK || COMPILE_TEST > > Can you really compile this driver if HAVE_CLK isn't available? > As I can see, clk.h has all the methods stubbed out if CONFIG_HAVE_CLK is not set. (And I think that all other headers like that do as well) I've tried to build it without clk right now and it builds with no errors, neither test robots complained about that. >> + help >> + Generic PWM framework driver for outputs that can be >> + muxed to clocks. >> + >> + To compile this driver as a module, choose M here: the module >> + will be called pwm-clk. >> + >> config PWM_CLPS711X >> tristate "CLPS711X PWM support" >> depends on ARCH_CLPS711X || COMPILE_TEST >> diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile >> index 708840b7fba8..4a860103c470 100644 >> --- a/drivers/pwm/Makefile >> +++ b/drivers/pwm/Makefile >> @@ -10,6 +10,7 @@ obj-$(CONFIG_PWM_BCM_KONA) += pwm-bcm-kona.o >> obj-$(CONFIG_PWM_BCM2835) += pwm-bcm2835.o >> obj-$(CONFIG_PWM_BERLIN) += pwm-berlin.o >> obj-$(CONFIG_PWM_BRCMSTB) += pwm-brcmstb.o >> +obj-$(CONFIG_PWM_CLK) += pwm-clk.o >> obj-$(CONFIG_PWM_CLPS711X) += pwm-clps711x.o >> obj-$(CONFIG_PWM_CRC) += pwm-crc.o >> obj-$(CONFIG_PWM_CROS_EC) += pwm-cros-ec.o >> diff --git a/drivers/pwm/pwm-clk.c b/drivers/pwm/pwm-clk.c >> new file mode 100644 >> index 000000000000..52c9923368cb >> --- /dev/null >> +++ b/drivers/pwm/pwm-clk.c >> @@ -0,0 +1,139 @@ >> +// SPDX-License-Identifier: GPL-2.0 >> +/* >> + * Clock based PWM controller >> + * >> + * Copyright (c) 2021 Nikita Travkin <nikita@trvn.ru> >> + * >> + * This is an "adapter" driver that allows PWM consumers to use >> + * system clocks with duty cycle control as PWM outputs. >> + * >> + * Limitations: >> + * - Due to the fact that exact behavior depends on the underlying >> + * clock driver, various limitations are possible. >> + * - Underlying clock may not be able to give 0% or 100% duty cycle >> + * (constant off or on), exact behavior will depend on the clock. >> + * - When the PWM is disabled, the clock will be disabled as well, >> + * line state will depend on the clock. > > - The clk API doesn't expose the necessary calls to implement > .get_state(). > >> + */ >> + >> +#include <linux/kernel.h> >> +#include <linux/math64.h> >> +#include <linux/err.h> >> +#include <linux/module.h> >> +#include <linux/of.h> >> +#include <linux/platform_device.h> >> +#include <linux/clk.h> >> +#include <linux/pwm.h> >> + >> +struct pwm_clk_chip { >> + struct pwm_chip chip; >> + struct clk *clk; >> + bool clk_enabled; >> +}; >> + >> +#define to_pwm_clk_chip(_chip) container_of(_chip, struct pwm_clk_chip, chip) >> + >> +static int pwm_clk_apply(struct pwm_chip *pwm_chip, struct pwm_device *pwm, >> + const struct pwm_state *state) >> +{ >> + struct pwm_clk_chip *chip = to_pwm_clk_chip(pwm_chip); > > I'd prefer this was not called chip, as this is how struct pwm_chip > variables are called usually. My suggestion is: > > chip -> pcchip > pwm_chip -> chip > Thanks for the suggestion, I'll use the common naming then. Nikita > Best regards > Uwe ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2022-04-02 7:05 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2022-02-20 11:50 [PATCH v6 0/2] Clock based PWM output driver Nikita Travkin 2022-02-20 11:50 ` [PATCH v6 1/2] dt-bindings: pwm: Document clk based PWM controller Nikita Travkin 2022-02-23 15:56 ` Rob Herring 2022-02-20 11:50 ` [PATCH v6 2/2] pwm: Add clock based PWM output driver Nikita Travkin 2022-03-28 10:56 ` Uwe Kleine-König 2022-04-02 6:59 ` Nikita Travkin
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