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Wed, 09 Apr 2014 20:26:59 +0900 (KST) From: Sylwester Nawrocki To: linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org Subject: [PATCH RFC v5 1/2] clk: Add function parsing arbitrary clock list DT property Date: Wed, 09 Apr 2014 13:26:29 +0200 Message-id: <1397042790-10636-2-git-send-email-s.nawrocki@samsung.com> X-Mailer: git-send-email 1.7.9.5 In-reply-to: <1397042790-10636-1-git-send-email-s.nawrocki@samsung.com> References: <1397042790-10636-1-git-send-email-s.nawrocki@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrPLMWRmVeSWpSXmKPExsVy+t9jAd0WPddgg483JCwe3Gplsph/5Byr Rf+bhawWB/7sYLRoXryezeJs0xt2i86JS9gtNj2+xmpxedccNovbl3kt1h65y26x9PpFJoun Ey6yWUxaO5XRonXvEXaLv9s3sVgcftPOajFj8ks2iyVPO9gs1s94zeIg4rFm3hpGj5bmHjaP y329TB7PXk5m8pjdMZPVY9OqTjaPO9f2sHnsn7uG3WPzknqP3uZ3bB79fw08+rasYvQ4fmM7 k8fnTXIBfFFcNimpOZllqUX6dglcGe3T/rAVzJWs+DrnCVMD41WRLkZODgkBE4np05YxQdhi EhfurWfrYuTiEBJYxCgxb9UOFging0li3ssl7CBVbAKGEr1H+xhBbBEBF4nOB+vAipgF7jFL HD8/hwUkISwQIbHi+y1mEJtFQFXi0fvjYM28Am4Sbzq/Aq3jAFqnIDFnkg1ImFPAXWLb12aw mUJAJR+uz2eawMi7gJFhFaNoakFyQXFSeq6hXnFibnFpXrpecn7uJkZwtDyT2sG4ssHiEKMA B6MSD6+ipUuwEGtiWXFl7iFGCQ5mJRHe52yuwUK8KYmVValF+fFFpTmpxYcYpTlYlMR5D7Ra BwoJpCeWpGanphakFsFkmTg4pRoY94T7Lzm5ZT6rg/Oz1KqKm9qHDh9RaulfbeHcbMpvszs0 sbB9r7W2Xv/m0MWxLdciT6/UqtWO4j9v/kp6/bnME79/hay655J1m/PH5YhCx1zts2s2LXVn VU36Y9zd6tVq9eL7i7mJs6YnpTWIfTn8UFZ0z7slhdptK/oen3+yI3w+w+ZPH3QYlFiKMxIN tZiLihMBJPKs/JICAAA= X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140409_072726_910637_76DA529B X-CRM114-Status: GOOD ( 12.00 ) X-Spam-Score: -7.2 (-------) Cc: mark.rutland@arm.com, pdeschrijver@nvidia.com, mturquette@linaro.org, gregkh@linuxfoundation.org, s.hauer@pengutronix.de, sw0312.kim@samsung.com, linux-kernel@vger.kernel.org, t-kristo@ti.com, t.figa@samsung.com, kyungmin.park@samsung.com, robh+dt@kernel.org, laurent.pinchart@ideasonboard.com, Sylwester Nawrocki , galak@codeaurora.org, grant.likely@linaro.org, linux@arm.linux.org.uk, ben.dooks@codethink.co.uk, m.szyprowski@samsung.com X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The of_clk_get_by_property() function added by this patch is similar to of_clk_get(), except it allows to pass name of a DT property containing list of phandles and clock specifiers. For of_clk_get() this has been hard coded to "clocks". Signed-off-by: Sylwester Nawrocki --- Changes since v4: - none. Changes since v3: - added missing 'static inline' to the function stub definition. Changes since v2: - moved the function declaration from drivers/clk/clk.h to include/linux/clk.h Changes since v1: - s/of_clk_get_list_entry/of_clk_get_by_property. --- drivers/clk/clkdev.c | 25 +++++++++++++++++++++---- include/linux/clk.h | 7 +++++++ 2 files changed, 28 insertions(+), 4 deletions(-) diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c index a360b2e..1d41540 100644 --- a/drivers/clk/clkdev.c +++ b/drivers/clk/clkdev.c @@ -27,17 +27,28 @@ static LIST_HEAD(clocks); static DEFINE_MUTEX(clocks_mutex); #if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK) -struct clk *of_clk_get(struct device_node *np, int index) +/** + * of_clk_get_by_property() - Parse and lookup a clock referenced by a device node + * @np: pointer to clock consumer node + * @list_name: name of the clock list property + * @index: index to the clock list + * + * This function parses the @list_name property and together with @index + * value indicating an entry of the list uses it to look up the struct clk + * from the registered list of clock providers. + */ +struct clk *of_clk_get_by_property(struct device_node *np, + const char *list_name, int index) { struct of_phandle_args clkspec; struct clk *clk; int rc; - if (index < 0) + if (index < 0 || !list_name) return ERR_PTR(-EINVAL); - rc = of_parse_phandle_with_args(np, "clocks", "#clock-cells", index, - &clkspec); + rc = of_parse_phandle_with_args(np, list_name, "#clock-cells", + index, &clkspec); if (rc) return ERR_PTR(rc); @@ -51,6 +62,12 @@ struct clk *of_clk_get(struct device_node *np, int index) of_node_put(clkspec.np); return clk; } +EXPORT_SYMBOL(of_clk_get_by_property); + +struct clk *of_clk_get(struct device_node *np, int index) +{ + return of_clk_get_by_property(np, "clocks", index); +} EXPORT_SYMBOL(of_clk_get); /** diff --git a/include/linux/clk.h b/include/linux/clk.h index fb5e097..f3811d3 100644 --- a/include/linux/clk.h +++ b/include/linux/clk.h @@ -397,6 +397,8 @@ struct of_phandle_args; #if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK) struct clk *of_clk_get(struct device_node *np, int index); +struct clk *of_clk_get_by_property(struct device_node *np, + const char *list_name, int index); struct clk *of_clk_get_by_name(struct device_node *np, const char *name); struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec); #else @@ -409,6 +411,11 @@ static inline struct clk *of_clk_get_by_name(struct device_node *np, { return ERR_PTR(-ENOENT); } +static inline struct clk *of_clk_get_by_property(struct device_node *np, + const char *list_name, int index) +{ + return ERR_PTR(-ENOENT); +} #endif #endif