From: Juergen Beisert <j...@pengutronix.de>
Instead of hardcoding the ref_xtal in the clk driver, get it from the DT.
Signed-off-by: Juergen Beisert <j...@pengutronix.de>
Signed-off-by: Steffen Trumtrar <s.trumt...@pengutronix.de>
---
arch/arm/boot/dts/imx28.dtsi | 11 +++++++++++
drivers/clk/mxs/clk-imx28.c | 16 +++++++++++++++-
2 files changed, 26 insertions(+), 1 deletion(-)
diff --git a/arch/arm/boot/dts/imx28.dtsi b/arch/arm/boot/dts/imx28.dtsi
index 7ba4966..b9e3712 100644
--- a/arch/arm/boot/dts/imx28.dtsi
+++ b/arch/arm/boot/dts/imx28.dtsi
@@ -37,6 +37,17 @@
};
};
+ clocks {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ osc24m: system-oscillator {
+ compatible = "fixed-clock";
+ #clock-cells = <0>;
+ clock-frequency = <24000000>;
+ };
+ };
+
apb@80000000 {
compatible = "simple-bus";
#address-cells = <1>;
diff --git a/drivers/clk/mxs/clk-imx28.c b/drivers/clk/mxs/clk-imx28.c
index 76ce6c6..01048b5 100644
--- a/drivers/clk/mxs/clk-imx28.c
+++ b/drivers/clk/mxs/clk-imx28.c
@@ -158,7 +158,21 @@ int __init mx28_clocks_init(void)
clk_misc_init();
- clks[ref_xtal] = mxs_clk_fixed("ref_xtal", 24000000);
+ /* retrieve the crystal's frequencies from device tree */
+ for_each_compatible_node(np, NULL, "fixed-clock") {
+ u32 rate;
+
+ if (of_property_read_u32(np, "clock-frequency", &rate))
+ continue;
+
+ if (of_device_is_compatible(np, "fsl,mxs-system"))
+ clks[ref_xtal] = mxs_clk_fixed("ref_xtal", rate);
+ }
+
+ /* if not set, guess their frequency */
+ if (clks[ref_xtal] == NULL)
+ clks[ref_xtal] = mxs_clk_fixed("ref_xtal", 24000000);
+
clks[pll0] = mxs_clk_pll("pll0", "ref_xtal", PLL0CTRL0, 17, 480000000);
clks[pll1] = mxs_clk_pll("pll1", "ref_xtal", PLL1CTRL0, 17, 480000000);
clks[pll2] = mxs_clk_pll("pll2", "ref_xtal", PLL2CTRL0, 23, 50000000);
--
1.8.2.rc2
_______________________________________________
devicetree-discuss mailing list
devicetree-discuss@lists.ozlabs.org
https://lists.ozlabs.org/listinfo/devicetree-discuss
