From mboxrd@z Thu Jan 1 00:00:00 1970 From: david@lechnology.com (David Lechner) Date: Wed, 26 Oct 2016 15:03:24 -0500 Subject: [PATCH] ARM: davinci: register the usb20_phy clock on the DT file In-Reply-To: References: <20161026194916.14546-1-ahaslam@baylibre.com> Message-ID: <48fa5315-74db-cf33-1f34-86764f0e2c1c@lechnology.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 10/26/2016 03:01 PM, David Lechner wrote: > On 10/26/2016 02:49 PM, ahaslam at baylibre.com wrote: >> From: Axel Haslam >> >> 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 >> --- >> >> This patch depends on David's series for usb clocks: >> >> currently: >> [PATCH v6 0/5] da8xx USB PHY platform devices and clocks >> https://lkml.org/lkml/2016/10/25/867 >> >> arch/arm/mach-davinci/da8xx-dt.c | 2 ++ >> 1 file changed, 2 insertions(+) >> >> diff --git a/arch/arm/mach-davinci/da8xx-dt.c >> b/arch/arm/mach-davinci/da8xx-dt.c >> index c9f7e92..7947267 100644 >> --- a/arch/arm/mach-davinci/da8xx-dt.c >> +++ b/arch/arm/mach-davinci/da8xx-dt.c >> @@ -45,6 +45,8 @@ >> >> static void __init da850_init_machine(void) >> { >> + da8xx_register_usb20_phy_clk(false); >> + da8xx_register_usb11_phy_clk(false); >> of_platform_default_populate(NULL, da850_auxdata_lookup, NULL); >> } >> >> > > > You should check for error on return and print a warning if there is an > error. Like this: https://patchwork.kernel.org/patch/9395635/ > > (I actually just had to make this change a few minutes ago to > troubleshoot a problem that I am working on. > da8xx_register_usb11_phy_clk() is failing for some reason that I have > not figured out yet.) And actually, since my patch that provides these functions has not been accepted yet, why don't I just add this change to that series?