From: Gregory CLEMENT <gregory.clement@free-electrons.com>
To: Mike Turquette <mturquette@baylibre.com>,
Stephen Boyd <sboyd@codeaurora.org>,
linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Rob Herring <robh+dt@kernel.org>,
devicetree@vger.kernel.org, Jason Cooper <jason@lakedaemon.net>,
Andrew Lunn <andrew@lunn.ch>,
Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>,
Gregory CLEMENT <gregory.clement@free-electrons.com>,
Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
linux-arm-kernel@lists.infradead.org,
Nadav Haklai <nadavh@marvell.com>, Victor Gu <xigu@marvell.com>,
Romain Perier <romain.perier@free-electrons.com>,
Omri Itach <omrii@marvell.com>, Marcin Wojtas <mw@semihalf.com>,
Wilson Ding <dingwei@marvell.com>, Hua Jing <jinghua@marvell.com>,
Terry Zhou <bjzhou@marvell.com>
Subject: [PATCH v2 2/6] clk: mvebu: Add the xtal clock for Armada 3700 SoC
Date: Fri, 8 Jul 2016 00:37:47 +0200 [thread overview]
Message-ID: <1467931071-31004-3-git-send-email-gregory.clement@free-electrons.com> (raw)
In-Reply-To: <1467931071-31004-1-git-send-email-gregory.clement@free-electrons.com>
This clock is the parent of all the Armada 3700 clocks. It is a fixed
rate clock which depends on the gpio configuration read when resetting
the SoC.
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
---
drivers/clk/mvebu/Kconfig | 3 ++
drivers/clk/mvebu/Makefile | 1 +
drivers/clk/mvebu/armada-37xx-xtal.c | 98 ++++++++++++++++++++++++++++++++++++
3 files changed, 102 insertions(+)
create mode 100644 drivers/clk/mvebu/armada-37xx-xtal.c
diff --git a/drivers/clk/mvebu/Kconfig b/drivers/clk/mvebu/Kconfig
index 3165da77d525..fddc8ac5faff 100644
--- a/drivers/clk/mvebu/Kconfig
+++ b/drivers/clk/mvebu/Kconfig
@@ -24,6 +24,9 @@ config ARMADA_39X_CLK
bool
select MVEBU_CLK_COMMON
+config ARMADA_37XX_CLK
+ bool
+
config ARMADA_XP_CLK
bool
select MVEBU_CLK_COMMON
diff --git a/drivers/clk/mvebu/Makefile b/drivers/clk/mvebu/Makefile
index 7172ef65693d..4257a36d0219 100644
--- a/drivers/clk/mvebu/Makefile
+++ b/drivers/clk/mvebu/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_ARMADA_370_CLK) += armada-370.o
obj-$(CONFIG_ARMADA_375_CLK) += armada-375.o
obj-$(CONFIG_ARMADA_38X_CLK) += armada-38x.o
obj-$(CONFIG_ARMADA_39X_CLK) += armada-39x.o
+obj-$(CONFIG_ARMADA_37XX_CLK) += armada-37xx-xtal.o
obj-$(CONFIG_ARMADA_XP_CLK) += armada-xp.o
obj-$(CONFIG_ARMADA_AP806_SYSCON) += ap806-system-controller.o
obj-$(CONFIG_ARMADA_CP110_SYSCON) += cp110-system-controller.o
diff --git a/drivers/clk/mvebu/armada-37xx-xtal.c b/drivers/clk/mvebu/armada-37xx-xtal.c
new file mode 100644
index 000000000000..f832c219420f
--- /dev/null
+++ b/drivers/clk/mvebu/armada-37xx-xtal.c
@@ -0,0 +1,98 @@
+/*
+ * Marvell Armada 37xx SoC xtal clocks
+ *
+ * Copyright (C) 2016 Marvell
+ *
+ * Gregory CLEMENT <gregory.clement@free-electrons.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#define NB_GPIO1_LATCH 0xC
+#define XTAL_MODE BIT(31)
+
+static int armada_3700_xtal_clock_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ const char *xtal_name = "xtal";
+ struct device_node *parent;
+ struct regmap *regmap;
+ struct clk_hw *xtal_hw;
+ unsigned int rate;
+ u32 reg;
+ int ret;
+
+ xtal_hw = devm_kzalloc(&pdev->dev, sizeof(*xtal_hw), GFP_KERNEL);
+ if (!xtal_hw)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, xtal_hw);
+
+ parent = np->parent;
+ if (!parent) {
+ dev_err(&pdev->dev, "no parent\n");
+ return -ENODEV;
+ }
+
+ regmap = syscon_node_to_regmap(parent);
+ if (IS_ERR(regmap)) {
+ dev_err(&pdev->dev, "cannot get regmap\n");
+ return PTR_ERR(regmap);
+ }
+
+ ret = regmap_read(regmap, NB_GPIO1_LATCH, ®);
+ if (ret) {
+ dev_err(&pdev->dev, "cannot read from regmap\n");
+ return ret;
+ }
+
+ if (reg & XTAL_MODE)
+ rate = 40000000;
+ else
+ rate = 25000000;
+
+ of_property_read_string_index(np, "clock-output-names", 0, &xtal_name);
+ xtal_hw = clk_hw_register_fixed_rate(NULL, xtal_name, NULL, 0, rate);
+ if (IS_ERR(xtal_hw))
+ return PTR_ERR(xtal_hw);
+ ret = of_clk_add_hw_provider(np, of_clk_hw_simple_get, xtal_hw);
+
+ return ret;
+}
+
+static int armada_3700_xtal_clock_remove(struct platform_device *pdev)
+{
+ of_clk_del_provider(pdev->dev.of_node);
+
+ return 0;
+}
+
+static const struct of_device_id armada_3700_xtal_clock_of_match[] = {
+ { .compatible = "marvell,armada-3700-xtal-clock", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, armada_3700_xtal_clock_of_match);
+
+static struct platform_driver armada_3700_xtal_clock_driver = {
+ .probe = armada_3700_xtal_clock_probe,
+ .remove = armada_3700_xtal_clock_remove,
+ .driver = {
+ .name = "marvell-armada-3700-xtal-clock",
+ .of_match_table = armada_3700_xtal_clock_of_match,
+ },
+};
+
+module_platform_driver(armada_3700_xtal_clock_driver);
+
+MODULE_AUTHOR("Gregory CLEMENT <gregory.clement@free-electrons.com>");
+MODULE_DESCRIPTION("Marvell Armada 37xx SoC xtal clocks driver");
+MODULE_LICENSE("GPL v2");
--
2.5.0
next prev parent reply other threads:[~2016-07-07 22:37 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-07 22:37 [PATCH v2 0/6] Add clock support for Armada 37xx SoCs Gregory CLEMENT
2016-07-07 22:37 ` [PATCH v2 1/6] dt-bindings: clock: add DT binding for the Xtal clock on Armada 3700 Gregory CLEMENT
2016-07-08 7:31 ` Thomas Petazzoni
2016-07-11 16:12 ` Gregory CLEMENT
2016-07-07 22:37 ` Gregory CLEMENT [this message]
2016-07-08 17:32 ` [PATCH v2 2/6] clk: mvebu: Add the xtal clock for Armada 3700 SoC Michael Turquette
2016-07-12 10:42 ` Gregory CLEMENT
2016-07-09 23:34 ` Paul Gortmaker
2016-07-12 10:43 ` Gregory CLEMENT
2016-07-07 22:37 ` [PATCH v2 3/6] dt-bindings: clock: add DT binding for the TBG clocks on Armada 3700 Gregory CLEMENT
2016-07-07 22:37 ` [PATCH v2 4/6] clk: mvebu Add the time base generator clocks for " Gregory CLEMENT
2016-07-07 22:37 ` [PATCH v2 5/6] dt-bindings: clock: add DT binding for the peripheral clocks on " Gregory CLEMENT
2016-07-07 22:37 ` [PATCH v2 6/6] clk: mvebu: Add the peripheral clock driver for " Gregory CLEMENT
2016-07-08 18:27 ` Michael Turquette
2016-07-12 16:30 ` Gregory CLEMENT
2016-07-12 17:28 ` Michael Turquette
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