From: Rasmus Villemoes <linux@rasmusvillemoes.dk>
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
Date: Fri, 26 Feb 2021 15:14:11 +0100 [thread overview]
Message-ID: <20210226141411.2517368-3-linux@rasmusvillemoes.dk> (raw)
In-Reply-To: <20210226141411.2517368-1-linux@rasmusvillemoes.dk>
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);
--
2.29.2
next prev parent reply other threads:[~2021-02-26 14:16 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-26 14:14 [PATCH 0/2] add ripple counter dt binding and driver Rasmus Villemoes
2021-02-26 14:14 ` [PATCH 1/2] dt-bindings: misc: add binding for generic ripple counter Rasmus Villemoes
2021-03-08 17:21 ` Rob Herring
2021-03-08 20:02 ` Rasmus Villemoes
2021-03-08 21:38 ` Rob Herring
2021-03-09 7:39 ` Rasmus Villemoes
2021-03-09 15:44 ` Rob Herring
2021-02-26 14:14 ` Rasmus Villemoes [this message]
2021-02-28 5:47 ` [PATCH 2/2] drivers: misc: add ripple counter driver Chen, Mike Ximing
[not found] ` <CAHp75Vc8S2E0vWFcqK-jO9Nhd-Us_7t-aWNj-7k+fWDcqR1XkQ@mail.gmail.com>
2021-02-28 9:29 ` Andy Shevchenko
2021-02-28 9:33 ` Andy Shevchenko
2021-03-01 8:29 ` Rasmus Villemoes
2021-02-26 14:35 ` [PATCH 0/2] add ripple counter dt binding and driver Arnd Bergmann
2021-02-26 16:35 ` Rasmus Villemoes
2021-02-26 19:53 ` Guenter Roeck
2021-03-01 8:34 ` Rasmus Villemoes
2021-03-01 9:44 ` Arnd Bergmann
2021-03-01 14:21 ` Guenter Roeck
2021-03-04 22:12 ` [PATCH v2 0/3] add "delay" clock support to gpio_wdt Rasmus Villemoes
2021-03-04 22:12 ` [PATCH v2 1/3] clk: add devm_clk_prepare_enable() helper Rasmus Villemoes
2021-03-09 5:28 ` Guenter Roeck
2022-03-05 2:41 ` Dmitry Torokhov
2021-03-04 22:12 ` [PATCH v2 2/3] dt-bindings: watchdog: add optional "delay" clock to gpio-wdt binding Rasmus Villemoes
2021-03-04 22:12 ` [PATCH v2 3/3] watchdog: gpio_wdt: implement support for optional "delay" clock Rasmus Villemoes
2021-03-09 5:51 ` [PATCH v2 0/3] add "delay" clock support to gpio_wdt Guenter Roeck
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