From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steffen Trumtrar Subject: [PATCH 1/9] MXS/i.MX28: add the possibility to define the used crystals via device tree Date: Mon, 4 Mar 2013 15:05:40 +0100 Message-ID: <1362405948-12992-2-git-send-email-s.trumtrar@pengutronix.de> References: <1362405948-12992-1-git-send-email-s.trumtrar@pengutronix.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1362405948-12992-1-git-send-email-s.trumtrar-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: devicetree-discuss-bounces+gldd-devicetree-discuss=m.gmane.org-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org Sender: "devicetree-discuss" To: rtc-linux-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org, devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org Cc: Alessandro Zummo , Juergen Beisert , kernel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org, Steffen Trumtrar , linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org List-Id: devicetree@vger.kernel.org From: Juergen Beisert Signed-off-by: Juergen Beisert Signed-off-by: Steffen Trumtrar --- 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..958bd10 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 = "fsl,mxs-system", "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); -- 1.7.10.4