linux-kernel - [PATCH v8 3/3] ARM: davinci: da8xx: register USB PHY clocks in the DT file

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Message-Id: <1477946841-16126-4-git-send-email-david@lechnology.com>
Date:   Mon, 31 Oct 2016 15:47:21 -0500
From:   David Lechner <david@...hnology.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Sekhar Nori <nsekhar@...com>, Kevin Hilman <khilman@...nel.org>
Cc:     Axel Haslam <ahaslam@...libre.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, David Lechner <david@...hnology.com>
Subject: [PATCH v8 3/3] ARM: davinci: da8xx: register USB PHY clocks in the DT file

From: Axel Haslam <ahaslam@...libre.com>

The usb20_phy clock needs to be registered for the driver to be able
to get and enable a clock. Currently the usb phy clocks are registered
form board files, which will not be called during a device tree based
boot.

To be able to probe correctly usb form a device tree boot, register
the usb phy clocks form the DT specific init.

Unfourtunatly, davinci does not have proper clock support on device tree
yet, so by registering the clock form de DT specific file we are
forced to hardcode the parent clock, and cannot select refclkin as
parent for any of the phy clocks of the da850 family.

As none of the current da850 based boards currently in mainline use
refclkin as source. I guess we can live with this limitation until clocks
are correctly represented through CCF/device tree.

Signed-off-by: Axel Haslam <ahaslam@...libre.com>
[Added error checking]
Signed-off-by: David Lechner <david@...hnology.com>
---
 arch/arm/mach-davinci/da8xx-dt.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/arm/mach-davinci/da8xx-dt.c b/arch/arm/mach-davinci/da8xx-dt.c
index 20fa842..230c151 100644
--- a/arch/arm/mach-davinci/da8xx-dt.c
+++ b/arch/arm/mach-davinci/da8xx-dt.c
@@ -49,6 +49,17 @@ static struct of_dev_auxdata da850_auxdata_lookup[] __initdata = {

 static void __init da850_init_machine(void)
 {
+	int ret;
+
+	ret = da8xx_register_usb20_phy_clk(false);
+	if (ret)
+		pr_warn("%s: registering USB 2.0 PHY clock failed: %d",
+			__func__, ret);
+	ret = da8xx_register_usb11_phy_clk(false);
+	if (ret)
+		pr_warn("%s: registering USB 1.1 PHY clock failed: %d",
+			__func__, ret);
+
 	of_platform_default_populate(NULL, da850_auxdata_lookup, NULL);
 }

-- 
2.7.4