On Mon, Feb 28, 2011 at 9:33 PM, Tomi Valkeinen <tomi.valkeinen@xxxxxx> wrote: > On Mon, 2011-02-28 at 09:02 -0600, Semwal, Sumit wrote: >> Provide a function in pdata to allow dss submodules to check if a given >> clock is available on a platform as an optional clock. >> >> Signed-off-by: Senthilvadivu Guruswamy <svadivu@xxxxxx> >> (based on implementation from Senthil) >> >> Signed-off-by: Sumit Semwal <sumit.semwal@xxxxxx> >> --- >> arch/arm/mach-omap2/display.c | 20 ++++++++++++++++++++ >> arch/arm/plat-omap/include/plat/display.h | 2 ++ >> 2 files changed, 22 insertions(+), 0 deletions(-) >> >> diff --git a/arch/arm/mach-omap2/display.c b/arch/arm/mach-omap2/display.c >> index 5ab6a74..9f4f862 100644 >> --- a/arch/arm/mach-omap2/display.c >> +++ b/arch/arm/mach-omap2/display.c >> @@ -42,6 +42,25 @@ static struct omap_device_pm_latency omap_dss_latency[] = { >> }, >> }; >> >> +static bool opt_clock_available(const char *clk_role) >> +{ >> + int i; >> + struct omap_hwmod *oh; >> + >> + /* opt_clks are always associated with dss hwmod */ >> + oh = omap_hwmod_lookup("dss_core"); >> + if (!oh) { >> + pr_err("Could not look up dss_core.\n"); >> + return -ENODEV; > > The function returns a bool. Perhaps the lookup would be better done in > omap_display_init(), and stored in a static variable. Yes; I guess I should go with your earlier suggestion - of keeping this 'oh' as part of pdata, and then use it here. > > Or if it's clear that this should never happen, BUG_ON(!oh); Well, multiple people have 'frowned' upon using BUG_ON in dss - especially because some people might still want their kernel to keep working despite a display failure? ~Sumit. > > Tomi > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-omap" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html