From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jean-Francois Moine Subject: [PATCH v2 1/2] ASoC: kirkwood: clk: probe defer when clock not yet ready Date: Sat, 21 Sep 2013 12:00:06 +0200 Message-ID: <20130921120006.47b00fe7@armhf> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Liam Girdwood , Mark Brown Cc: Jaroslav Kysela , Takashi Iwai , Grant Likely , Rob Herring , alsa-devel-K7yf7f+aM1XWsZ/bQMPhNw@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, Mike Turquette , Russell King List-Id: devicetree@vger.kernel.org At probe time, a clock device may not be ready when some other device wants to use it.=20 This patch lets the functions clk_get/devm_clk_get return a probe defer when the clock is defined in the DT but not yet available. Signed-off-by: Jean-Francois Moine --- drivers/clk/clk.c | 2 +- drivers/clk/clkdev.c | 9 +++++++-- 2 files changed, 8 insertions(+), 3 deletions(-) diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index a004769..582abc8 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -2181,7 +2181,7 @@ EXPORT_SYMBOL_GPL(of_clk_del_provider); struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec) { struct of_clk_provider *provider; - struct clk *clk =3D ERR_PTR(-ENOENT); + struct clk *clk =3D ERR_PTR(-EPROBE_DEFER); =20 /* Check if we have such a provider in our array */ mutex_lock(&of_clk_lock); diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c index 442a313..f8b28d9 100644 --- a/drivers/clk/clkdev.c +++ b/drivers/clk/clkdev.c @@ -157,8 +157,13 @@ struct clk *clk_get(struct device *dev, const char= *con_id) =20 if (dev) { clk =3D of_clk_get_by_name(dev->of_node, con_id); - if (!IS_ERR(clk) && __clk_get(clk)) - return clk; + if (!IS_ERR(clk)) { + if (__clk_get(clk)) + return clk; + } else { + if (PTR_ERR(clk) =3D=3D -EPROBE_DEFER) + return clk; + } } =20 return clk_get_sys(dev_id, con_id); --=20 Ken ar c'henta=C3=B1 | ** Breizh ha Linux atav! ** Jef | http://moinejf.free.fr/ -- To unsubscribe from this list: send the line "unsubscribe devicetree" i= n the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html