clk: sunxi: Add sun6i/8i display support

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

Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

diff --git a/Documentation/devicetree/bindings/clock/sunxi.txt b/Documentation/devicetree/bindings/clock/sunxi.txt
index 834436f..9de34a8 100644 (file)
--- 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..6ea7cf8 100644 (file)
--- 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);