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Mon, 5 Dec 2016 05:23:20 +0000 Message-ID: <8737i3vtl7.wl%kuninori.morimoto.gx@renesas.com> From: Kuninori Morimoto Subject: [PATCH 1/3] clkdev: add devm_get_clk_from_child() User-Agent: Wanderlust/2.15.9 Emacs/24.3 Mule/6.0 To: Russell King - ARM Linux , Stephen Boyd , Rob Herring , Linux-ALSA , Linux-DT , Michael Turquette , Linux-Kernel , Mark Brown , , Linux-ARM In-Reply-To: <874m2jvtmw.wl%kuninori.morimoto.gx@renesas.com> References: <874m2jvtmw.wl%kuninori.morimoto.gx@renesas.com> MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Date: Mon, 5 Dec 2016 05:23:20 +0000 X-Originating-IP: [211.11.155.144] X-ClientProxiedBy: TYXPR0101CA0013.jpnprd01.prod.outlook.com (10.168.40.151) To HK2PR0601MB1441.apcprd06.prod.outlook.com (10.165.182.147) X-MS-Office365-Filtering-Correlation-Id: 91714182-5e79-49be-1e06-08d41cced3d5 X-Microsoft-Antispam: UriScan:; BCL:0; PCL:0; RULEID:(22001); SRVR:HK2PR0601MB1441; X-Microsoft-Exchange-Diagnostics: 1; HK2PR0601MB1441; 3:aiufhqe7BPh82ZK8YXbABU2COC+/08R3HTcFealqy/eadG/oHIWwKIws+LUKQQeaoNPAnfTfnTb2Vuflf1cneqIOBTbnmHmmn8aPQ/bvXYt7H4us7H0nY+jAh1eoVGjHLH/2tEtsEmX0T6ockDHOVq8+kWf8YWIPrj+KVuiEivoa1uyRj407F+UOtInpEtaHZm2t+zO59l3i4FUT8P4z6sNbLJJWuk11kGl44rVbZoSnE91yJhtbIwxveYCJF3shu1PxBgnoywedr/8lwFJd1w==; 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20:dDzGLyTFWzXGw5SvhEKcxXUWpiLmkrhleN0kHS9oCABNROCY5asBD33ZdmFl4Rk7TdRioE2lEdefMog8gBQIoASQNgb5KnDMbxh5wCdACDvOWQauO6PKdp4L7N3kHD4RKjGTjhvJS5cjT6Lk8SRBrZS4fyILtzpzXiZ0tBOE05k= X-OriginatorOrg: renesas.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Dec 2016 05:23:20.1266 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: HK2PR0601MB1441 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20161204_212345_219193_D87A06C7 X-CRM114-Status: GOOD ( 16.37 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP From: Kuninori Morimoto Some driver is using this type of DT bindings for clock (more detail, see ${LINUX}/Documentation/devicetree/bindings/sound/simple-card.txt). sound_soc { ... cpu { clocks = <&xxx>; ... }; codec { clocks = <&xxx>; ... }; }; Current driver in this case uses of_clk_get() for each node, but there is no devm_of_clk_get() today. OTOH, the problem of having devm_of_clk_get() is that it encourages the use of of_clk_get() when clk_get() is more desirable. Thus, this patch adds new devm_get_clk_from_chile() which explicitly reads as get a clock from a child node of this device. By this function, we can also use this type of DT bindings sound_soc { clocks = <&xxx>, <&xxx>; clock-names = "cpu", "codec"; ... cpu { ... }; codec { ... }; }; Signed-off-by: Kuninori Morimoto Acked-by: Russell King --- drivers/clk/clk-devres.c | 21 +++++++++++++++++++++ include/linux/clk.h | 29 +++++++++++++++++++++++++---- 2 files changed, 46 insertions(+), 4 deletions(-) diff --git a/drivers/clk/clk-devres.c b/drivers/clk/clk-devres.c index 8f57154..3a218c3 100644 --- a/drivers/clk/clk-devres.c +++ b/drivers/clk/clk-devres.c @@ -53,3 +53,24 @@ void devm_clk_put(struct device *dev, struct clk *clk) WARN_ON(ret); } EXPORT_SYMBOL(devm_clk_put); + +struct clk *devm_get_clk_from_child(struct device *dev, + struct device_node *np, const char *con_id) +{ + struct clk **ptr, *clk; + + ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return ERR_PTR(-ENOMEM); + + clk = of_clk_get_by_name(np, con_id); + if (!IS_ERR(clk)) { + *ptr = clk; + devres_add(dev, ptr); + } else { + devres_free(ptr); + } + + return clk; +} +EXPORT_SYMBOL(devm_get_clk_from_child); diff --git a/include/linux/clk.h b/include/linux/clk.h index 123c027..e9d36b3 100644 --- a/include/linux/clk.h +++ b/include/linux/clk.h @@ -17,8 +17,9 @@ #include struct device; - struct clk; +struct device_node; +struct of_phandle_args; /** * DOC: clk notifier callback types @@ -249,6 +250,23 @@ static inline void clk_unprepare(struct clk *clk) struct clk *devm_clk_get(struct device *dev, const char *id); /** + * devm_get_clk_from_child - lookup and obtain a managed reference to a + * clock producer from child node. + * @dev: device for clock "consumer" + * @np: pointer to clock consumer node + * @con_id: clock consumer ID + * + * This function parses the clocks, and uses them to look up the + * struct clk from the registered list of clock providers by using + * @np and @con_id + * + * The clock will automatically be freed when the device is unbound + * from the bus. + */ +struct clk *devm_get_clk_from_child(struct device *dev, + struct device_node *np, const char *con_id); + +/** * clk_enable - inform the system when the clock source should be running. * @clk: clock source * @@ -432,6 +450,12 @@ static inline struct clk *devm_clk_get(struct device *dev, const char *id) return NULL; } +static inline struct clk *devm_get_clk_from_child(struct device *dev, + struct device_node *np, const char *con_id) +{ + return NULL; +} + static inline void clk_put(struct clk *clk) {} static inline void devm_clk_put(struct device *dev, struct clk *clk) {} @@ -501,9 +525,6 @@ static inline void clk_disable_unprepare(struct clk *clk) clk_unprepare(clk); } -struct device_node; -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_name(struct device_node *np, const char *name);