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Date: Fri, 17 Oct 2014 15:06:55 +0200
From: Davor Joja <davorjoja@...icbricks.com>
To: <linux-kernel@...r.kernel.org>
CC: Davor Joja <davorjoja@...icbricks.com>
Subject: [PATCH 04/10] fbdev: xylon: Framebuffer driver pixel clock
Driver pixel clock control functionality supporting Xylon logiCLK IP
core clock generator.
Signed-off-by: Davor Joja <davorjoja@...icbricks.com>
---
drivers/video/fbdev/xylon/xylonfb_pixclk.c | 115 +++++++++++++++++++++++++++++
1 file changed, 115 insertions(+)
create mode 100644 drivers/video/fbdev/xylon/xylonfb_pixclk.c
diff --git a/drivers/video/fbdev/xylon/xylonfb_pixclk.c b/drivers/video/fbdev/xylon/xylonfb_pixclk.c
new file mode 100644
index 0000000..5f82b50
--- /dev/null
+++ b/drivers/video/fbdev/xylon/xylonfb_pixclk.c
@@ -0,0 +1,115 @@
+/*
+ * Xylon logiCVC frame buffer driver pixel clock control
+ *
+ * Copyright (C) 2014 Xylon d.o.o.
+ * Author: Davor Joja <davor.joja@...icbricks.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+
+struct xylonfb_pixclk {
+ struct device *dev;
+ struct device_node *dn;
+ struct clk *clk;
+};
+
+#if defined(CONFIG_FB_XYLON_PIXCLK_LOGICLK)
+static const struct of_device_id logiclk_of_match[] = {
+ { .compatible = "xylon,logiclk-1.02.b" },
+ {/* end of table */}
+};
+static struct xylonfb_pixclk logiclk;
+#endif
+
+bool xylonfb_hw_pixclk_supported(struct device *dev, struct device_node *dn);
+void xylonfb_hw_pixclk_unload(struct device_node *dn);
+int xylonfb_hw_pixclk_set(struct device *dev, struct device_node *dn,
+ unsigned long pixclk_khz);
+
+#if defined(CONFIG_FB_XYLON_PIXCLK)
+static int xylonfb_hw_pixclk_set_freq(struct device *dev,
+ struct device_node *dn,
+ unsigned long freq_khz)
+{
+ struct clk *clk = NULL;
+
+#if defined(CONFIG_FB_XYLON_PIXCLK_LOGICLK)
+ if (dn == logiclk.dn)
+ clk = logiclk.clk;
+#endif
+
+ if (clk && clk_set_rate(clk, (freq_khz * 1000))) {
+ dev_err(dev, "failed set pixel clock frequency\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+#endif
+
+bool xylonfb_hw_pixclk_supported(struct device *dev, struct device_node *dn)
+{
+ struct clk **clk;
+ bool clk_dev = false;
+
+#if defined(CONFIG_FB_XYLON_PIXCLK_LOGICLK)
+ if (of_match_node(logiclk_of_match, of_get_parent(dn))) {
+ clk = &logiclk.clk;
+ logiclk.dev = dev;
+ logiclk.dn = dn;
+ clk_dev = true;
+ }
+#endif
+
+ if (clk_dev) {
+ *clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(*clk)) {
+ dev_err(dev, "failed get pixel clock\n");
+ return false;
+ }
+ if (clk_prepare_enable(*clk)) {
+ dev_err(dev,
+ "failed prepare/enable pixel clock\n");
+ return false;
+ }
+
+ return true;
+ } else {
+ return false;
+ }
+}
+
+void xylonfb_hw_pixclk_unload(struct device_node *dn)
+{
+ struct clk *clk = NULL;
+
+#if defined(CONFIG_FB_XYLON_PIXCLK_LOGICLK)
+ clk = logiclk.clk;
+#endif
+
+ if (clk)
+ clk_disable_unprepare(clk);
+}
+
+int xylonfb_hw_pixclk_set(struct device *dev, struct device_node *dn,
+ unsigned long pixclk_khz)
+{
+#if defined(CONFIG_FB_XYLON_PIXCLK)
+ return xylonfb_hw_pixclk_set_freq(dev, dn, pixclk_khz);
+#else
+ dev_warn(dev, "pixel clock control not supported\n");
+ return -ENODEV;
+#endif
+}
--
1.9.1
--
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