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    SubjectRE: [PATCH 2/2] drivers: misc: add ripple counter driver
    Date


    > -----Original Message-----
    > From: Rasmus Villemoes <linux@rasmusvillemoes.dk>
    > Sent: Friday, February 26, 2021 9:14 AM
    > To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>; Rob Herring
    > <robh+dt@kernel.org>
    > Cc: devicetree@vger.kernel.org; linux-kernel@vger.kernel.org; Arnd Bergmann
    > <arnd@arndb.de>; linux-clk@vger.kernel.org; Rasmus Villemoes
    > <linux@rasmusvillemoes.dk>
    > Subject: [PATCH 2/2] drivers: misc: add ripple counter driver
    >
    > 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 <linux@rasmusvillemoes.dk>
    > ---
    > 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);

    Missing MODULE_LICENSE() tag?
    See https://www.kernel.org/doc/html/latest/process/license-rules.html#license-identifiers

    > --
    > 2.29.2

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