From: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
To: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Cc: f.fainelli@gmail.com, linux-kernel@vger.kernel.org,
linux-pwm@vger.kernel.org, bcm-kernel-feedback-list@broadcom.com,
linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
wahrenst@gmx.net, linux-input@vger.kernel.org,
dmitry.torokhov@gmail.com, gregkh@linuxfoundation.org,
devel@driverdev.osuosl.org, p.zabel@pengutronix.de,
linux-gpio@vger.kernel.org, linus.walleij@linaro.org,
linux-clk@vger.kernel.org, sboyd@kernel.org,
linux-rpi-kernel@lists.infradead.org, bgolaszewski@baylibre.com,
andy.shevchenko@gmail.com
Subject: Re: [PATCH v8 11/11] pwm: Add Raspberry Pi Firmware based PWM bus
Date: Fri, 12 Mar 2021 21:12:17 +0100 [thread overview]
Message-ID: <20210312201217.n2sav23swy7ii4uo@pengutronix.de> (raw)
In-Reply-To: <20210312122454.24480-12-nsaenzjulienne@suse.de>
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Hello Nicolas,
On Fri, Mar 12, 2021 at 01:24:54PM +0100, Nicolas Saenz Julienne wrote:
> Adds support to control the PWM bus available in official Raspberry Pi
> PoE HAT. Only RPi's co-processor has access to it, so commands have to
> be sent through RPi's firmware mailbox interface.
>
> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
>
> ---
>
> Changes since v7:
> - Remove unwarranted RPI_PWM_DEF_DUTY_REG usage
>
> Changes since v6:
> - Use %pe
> - Round divisions properly
> - Use dev_err_probe()
> - Pass check_patch
>
> Changes since v3:
> - Rename compatible string to be more explicit WRT to bus's limitations
>
> Changes since v2:
> - Use devm_rpi_firmware_get()
> - Rename driver
> - Small cleanups
>
> Changes since v1:
> - Use default pwm bindings and get rid of xlate() function
> - Correct spelling errors
> - Correct apply() function
> - Round values
> - Fix divisions in arm32 mode
> - Small cleanups
>
> drivers/pwm/Kconfig | 9 ++
> drivers/pwm/Makefile | 1 +
> drivers/pwm/pwm-raspberrypi-poe.c | 206 ++++++++++++++++++++++++++++++
> 3 files changed, 216 insertions(+)
> create mode 100644 drivers/pwm/pwm-raspberrypi-poe.c
>
> diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
> index a7a7a9f26aef..d3371ac7b871 100644
> --- a/drivers/pwm/Kconfig
> +++ b/drivers/pwm/Kconfig
> @@ -431,6 +431,15 @@ config PWM_PXA
> To compile this driver as a module, choose M here: the module
> will be called pwm-pxa.
>
> +config PWM_RASPBERRYPI_POE
> + tristate "Raspberry Pi Firwmware PoE Hat PWM support"
> + # Make sure not 'y' when RASPBERRYPI_FIRMWARE is 'm'. This can only
> + # happen when COMPILE_TEST=y, hence the added !RASPBERRYPI_FIRMWARE.
> + depends on RASPBERRYPI_FIRMWARE || (COMPILE_TEST && !RASPBERRYPI_FIRMWARE)
> + help
> + Enable Raspberry Pi firmware controller PWM bus used to control the
> + official RPI PoE hat
> +
> config PWM_RCAR
> tristate "Renesas R-Car PWM support"
> depends on ARCH_RENESAS || COMPILE_TEST
> diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
> index 4e35a55fa7b6..d3879619bd76 100644
> --- a/drivers/pwm/Makefile
> +++ b/drivers/pwm/Makefile
> @@ -39,6 +39,7 @@ obj-$(CONFIG_PWM_NTXEC) += pwm-ntxec.o
> obj-$(CONFIG_PWM_OMAP_DMTIMER) += pwm-omap-dmtimer.o
> obj-$(CONFIG_PWM_PCA9685) += pwm-pca9685.o
> obj-$(CONFIG_PWM_PXA) += pwm-pxa.o
> +obj-$(CONFIG_PWM_RASPBERRYPI_POE) += pwm-raspberrypi-poe.o
> obj-$(CONFIG_PWM_RCAR) += pwm-rcar.o
> obj-$(CONFIG_PWM_RENESAS_TPU) += pwm-renesas-tpu.o
> obj-$(CONFIG_PWM_ROCKCHIP) += pwm-rockchip.o
> diff --git a/drivers/pwm/pwm-raspberrypi-poe.c b/drivers/pwm/pwm-raspberrypi-poe.c
> new file mode 100644
> index 000000000000..71ade5e55069
> --- /dev/null
> +++ b/drivers/pwm/pwm-raspberrypi-poe.c
> @@ -0,0 +1,206 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2020 Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
2021?
> + * For more information on Raspberry Pi's PoE hat see:
> + * https://www.raspberrypi.org/products/poe-hat/
Out of personal interest: Is this hat also able to power a RPi CM4?
> + * Limitations:
> + * - No disable bit, so a disabled PWM is simulated by duty_cycle 0
> + * - Only normal polarity
> + * - Fixed 12.5 kHz period
> + *
> + * The current period is completed when HW is reconfigured.
> + */
Other than that as mentioned in the previous round: This looks good,
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
What is your thought about how to get this series merged? At least
input, staging, armsoc, clk, reset anf firmware are touched. Do you
prepare a branch for merging in the relevant trees (once you have all
the necessary Acks)?
Best regards
Uwe
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | https://www.pengutronix.de/ |
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next prev parent reply other threads:[~2021-03-12 20:13 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-12 12:24 [PATCH v8 00/11] Raspberry Pi PoE HAT fan support Nicolas Saenz Julienne
2021-03-12 12:24 ` [PATCH v8 01/11] firmware: raspberrypi: Keep count of all consumers Nicolas Saenz Julienne
2021-03-12 12:24 ` [PATCH v8 02/11] firmware: raspberrypi: Introduce devm_rpi_firmware_get() Nicolas Saenz Julienne
2021-03-12 12:24 ` [PATCH v8 03/11] clk: bcm: rpi: Release firmware handle on unbind Nicolas Saenz Julienne
2021-03-12 12:24 ` [PATCH v8 04/11] gpio: raspberrypi-exp: " Nicolas Saenz Julienne
2021-03-12 12:24 ` [PATCH v8 05/11] reset: raspberrypi: " Nicolas Saenz Julienne
2021-03-12 12:24 ` [PATCH v8 06/11] soc: bcm: raspberrypi-power: " Nicolas Saenz Julienne
2021-03-12 12:24 ` [PATCH v8 07/11] staging: vchiq: " Nicolas Saenz Julienne
2021-03-12 12:24 ` [PATCH v8 08/11] input: raspberrypi-ts: Release firmware handle when not needed Nicolas Saenz Julienne
2021-03-12 12:24 ` [PATCH v8 09/11] dt-bindings: pwm: Add binding for RPi firmware PWM bus Nicolas Saenz Julienne
2021-03-12 12:24 ` [PATCH v8 10/11] DO NOT MERGE: ARM: dts: Add RPi's official PoE hat support Nicolas Saenz Julienne
2021-03-12 12:24 ` [PATCH v8 11/11] pwm: Add Raspberry Pi Firmware based PWM bus Nicolas Saenz Julienne
2021-03-12 20:12 ` Uwe Kleine-König [this message]
2021-03-15 16:12 ` Nicolas Saenz Julienne
2021-03-22 11:56 ` Thierry Reding
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