[PATCH RFC 1/3] clk: omap: introduce clock driver

Mike Turquette
2013-06-04T06:39:16Z

Parses OMAP clock data from DT and registers those clocks with the clock
framework. dt_omap_clk_init must be called early during boot for timer
initialization so it is exported and called from the existing clock code
instead of probing like a real driver.

Cc: Benoit Cousson <b-cousson@ti.com>
Cc: Rajendra Nayak <rnayak@ti.com>
Cc: Joel A Fernandes <joelagnel@ti.com>
Cc: Nishanth Menon <nm@ti.com>
Cc: Paul Walmsley <paul@pwsan.com>
Cc: Tony Lindgren <tony@atomide.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
---
This driver simply matches the basic bindings (so far). Eventually it
would match omap-specific bindings for DPLLs, CLKOUTX2 and strange leaf
clocks as well. This doesn't scale well since non-OMAP related clock
data (e.g. a pmic or discrete audio codec) will get grouped into this
driver if it matches on a basic clock type. Suggestions?

drivers/clk/Makefile | 1 +
drivers/clk/omap/Makefile | 1 +
drivers/clk/omap/clk.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++
include/linux/clk/omap.h | 24 +++++++++++++++++++++
4 files changed, 81 insertions(+)
create mode 100644 drivers/clk/omap/Makefile
create mode 100644 drivers/clk/omap/clk.c
create mode 100644 include/linux/clk/omap.h

diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index f51b52b..efd4f2a 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_ARCH_VT8500) += clk-vt8500.o
obj-$(CONFIG_ARCH_ZYNQ) += clk-zynq.o
obj-$(CONFIG_ARCH_TEGRA) += tegra/
obj-$(CONFIG_PLAT_SAMSUNG) += samsung/
+obj-$(CONFIG_ARCH_OMAP) += omap/

obj-$(CONFIG_X86) += x86/

diff --git a/drivers/clk/omap/Makefile b/drivers/clk/omap/Makefile
new file mode 100644
index 0000000..8195931
--- /dev/null
+++ b/drivers/clk/omap/Makefile
@@ -0,0 +1 @@
+obj-y += clk.o
diff --git a/drivers/clk/omap/clk.c b/drivers/clk/omap/clk.c
new file mode 100644
index 0000000..e9e5c95
--- /dev/null
+++ b/drivers/clk/omap/clk.c
@@ -0,0 +1,55 @@
+/*
+ * OMAP PRCM clock driver
+ *
+ * Copyright (C) 2013 Linaro.org - http://www.linaro.org
+ * Mike Turquette <mturquette@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/clk/omap.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+
+/* FIXME - should the OMAP PRCM clock driver match generic types? */
+static const struct of_device_id clk_match[] = {
+ {.compatible = "fixed-clock", .data = of_fixed_clk_setup, },
+ {.compatible = "mux-clock", .data = of_mux_clk_setup, },
+ {.compatible = "fixed-factor-clock",
+ .data = of_fixed_factor_clk_setup, },
+ {},
+};
+
+static int omap_clk_probe(struct platform_device *pdev)
+{
+ of_clk_init(clk_match);
+ return 0;
+}
+
+static struct platform_driver omap_clk_driver = {
+ .probe = omap_clk_probe,
+ .driver = {
+ .name = "omap_clk",
+ .of_match_table = of_match_ptr(clk_match),
+ },
+};
+
+/* FIXME - need to initialize early; skip real driver registration & probe */
+int __init dt_omap_clk_init(void)
+{
+ return omap_clk_probe(NULL);
+}
+
+MODULE_DESCRIPTION("OMAP Clock driver");
+MODULE_AUTHOR("Texas Instruments Inc.");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/clk/omap.h b/include/linux/clk/omap.h
new file mode 100644
index 0000000..504e838
--- /dev/null
+++ b/include/linux/clk/omap.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2010 Broadcom
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef __LINUX_CLK_OMAP_H_
+#define __LINUX_CLK_OMAP_H_
+
+int __init dt_omap_clk_init(void);
+
+#endif
--
1.8.1.2