The only purpose of this driver is to serve as a consumer of the input clock, to prevent it from being disabled by clk_disable_unused().
Signed-off-by: Rasmus Villemoes <[email protected]> --- drivers/misc/Kconfig | 7 +++++++ drivers/misc/Makefile | 1 + drivers/misc/ripple-ctr.c | 31 +++++++++++++++++++++++++++++++ 3 files changed, 39 insertions(+) create mode 100644 drivers/misc/ripple-ctr.c diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index f532c59bb59b..44b0b6ce42df 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -445,6 +445,13 @@ config HISI_HIKEY_USB switching between the dual-role USB-C port and the USB-A host ports using only one USB controller. +config RIPPLE_CTR + tristate "Trivial ripple counter driver" + help + This provides a stub driver for a ripple counter, whose + only purpose is to request and enable the clock source + driving the counter. + source "drivers/misc/c2port/Kconfig" source "drivers/misc/eeprom/Kconfig" source "drivers/misc/cb710/Kconfig" diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index 99b6f15a3c70..d560163068a9 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -56,3 +56,4 @@ obj-$(CONFIG_HABANA_AI) += habanalabs/ obj-$(CONFIG_UACCE) += uacce/ obj-$(CONFIG_XILINX_SDFEC) += xilinx_sdfec.o obj-$(CONFIG_HISI_HIKEY_USB) += hisi_hikey_usb.o +obj-$(CONFIG_RIPPLE_CTR) += ripple-ctr.o diff --git a/drivers/misc/ripple-ctr.c b/drivers/misc/ripple-ctr.c new file mode 100644 index 000000000000..f086eaf335df --- /dev/null +++ b/drivers/misc/ripple-ctr.c @@ -0,0 +1,31 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/platform_device.h> + +static int ripple_ctr_probe(struct platform_device *pdev) +{ + struct clk *clk; + + clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(clk)) + return PTR_ERR(clk); + return clk_prepare_enable(clk); +} + +static const struct of_device_id ripple_ctr_ids[] = { + { .compatible = "linux,ripple-counter", }, + { } +}; +MODULE_DEVICE_TABLE(of, ripple_ctr_ids); + +static struct platform_driver ripple_ctr_driver = { + .driver = { + .name = "ripple-counter", + .of_match_table = ripple_ctr_ids, + }, + .probe = ripple_ctr_probe, +}; +module_platform_driver(ripple_ctr_driver); -- 2.29.2
