[PATCH 1/3] clk: sunxi: Add sun6i/8i display support

Jean-Francois Moine
2016-03-30T16:43:29Z

Add the clock type which is used by the sun6i/8i families for video display.

Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
---
Documentation/devicetree/bindings/clock/sunxi.txt | 1 +
drivers/clk/sunxi/clk-sunxi.c | 38 +++++++++++++++++++++++
2 files changed, 39 insertions(+)

diff --git a/Documentation/devicetree/bindings/clock/sunxi.txt b/Documentation/devicetree/bindings/clock/sunxi.txt
index 834436f..8c0fda8 100644
--- a/Documentation/devicetree/bindings/clock/sunxi.txt
+++ b/Documentation/devicetree/bindings/clock/sunxi.txt
@@ -81,6 +81,7 @@ Required properties:
"allwinner,sun9i-a80-usb-mod-clk" - for usb gates + resets on A80
"allwinner,sun9i-a80-usb-phy-clk" - for usb phy gates + resets on A80
"allwinner,sun4i-a10-ve-clk" - for the Video Engine clock
+ "allwinner,sun6i-a31-display-clk" - for the display clocks

Required properties for all clocks:
- reg : shall be the control register address for the clock.
diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c
index 91de0a0..0581e1b 100644
--- a/drivers/clk/sunxi/clk-sunxi.c
+++ b/drivers/clk/sunxi/clk-sunxi.c
@@ -1127,3 +1127,41 @@ static void __init sun6i_pll6_clk_setup(struct device_node *node)
}
CLK_OF_DECLARE(sun6i_pll6, "allwinner,sun6i-a31-pll6-clk",
sun6i_pll6_clk_setup);
+
+/*
+ * sun6i display
+ *
+ * rate = parent_rate / (m + 1);
+ */
+static void sun6i_display_factors(struct factors_request *req)
+{
+ u8 m;
+
+ if (req->rate > req->parent_rate)
+ req->rate = req->parent_rate;
+
+ m = DIV_ROUND_UP(req->parent_rate, req->rate);
+
+ req->rate = req->parent_rate / m;
+ req->m = m - 1;
+}
+
+static const struct clk_factors_config sun6i_display_config = {
+ .mshift = 0,
+ .mwidth = 4,
+};
+
+static const struct factors_data sun6i_display_data __initconst = {
+ .enable = 31,
+ .mux = 24,
+ .muxmask = BIT(2) | BIT(1) | BIT(0),
+ .table = &sun6i_display_config,
+ .getter = sun6i_display_factors,
+};
+
+static void __init sun6i_display_setup(struct device_node *node)
+{
+ sunxi_factors_clk_setup(node, &sun6i_display_data);
+}
+CLK_OF_DECLARE(sun6i_display, "allwinner,sun6i-a31-display-clk",
+ sun6i_display_setup);
--
2.8.0