From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-ee0-x231.google.com ([2a00:1450:4013:c00::231]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Vf8Wx-0000gT-Cg for barebox@lists.infradead.org; Sat, 09 Nov 2013 13:24:56 +0000 Received: by mail-ee0-f49.google.com with SMTP id b15so210102eek.22 for ; Sat, 09 Nov 2013 05:24:29 -0800 (PST) From: Sebastian Hesselbarth Date: Sat, 9 Nov 2013 14:24:19 +0100 Message-Id: <1384003461-21039-4-git-send-email-sebastian.hesselbarth@gmail.com> In-Reply-To: <1384003461-21039-1-git-send-email-sebastian.hesselbarth@gmail.com> References: <1384003461-21039-1-git-send-email-sebastian.hesselbarth@gmail.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 3/5] clk: add of_clk_init and CLK_OF_DECLARE macro To: Sebastian Hesselbarth Cc: barebox@lists.infradead.org This add barebox versions of of_clk_init for parsing and registering clock providers from DT. Also, a macro CLK_OF_DECLARE is added, that allows to put init callbacks into its own section that can be linked in the binary. Signed-off-by: Sebastian Hesselbarth --- Cc: barebox@lists.infradead.org --- drivers/clk/clk.c | 37 +++++++++++++++++++++++++++++++++++++ include/linux/clk.h | 14 ++++++++++++++ 2 files changed, 51 insertions(+) diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index 5942e29..31d73c0 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -271,6 +271,10 @@ struct of_clk_provider { void *data; }; +extern struct of_device_id __clk_of_table_start[]; +const struct of_device_id __clk_of_table_sentinel + __attribute__ ((unused,section (".__clk_of_table_end"))); + static LIST_HEAD(of_clk_providers); struct clk *of_clk_src_simple_get(struct of_phandle_args *clkspec, @@ -355,6 +359,39 @@ struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec) return clk; } + +/** + * of_clk_init() - Scan and init clock providers from the DT + * @root: parent of the first level to probe or NULL for the root of the tree + * @matches: array of compatible values and init functions for providers. + * + * This function scans the device tree for matching clock providers and + * calls their initialization functions + * + * Returns 0 on success, < 0 on failure. + */ +int of_clk_init(struct device_node *root, const struct of_device_id *matches) +{ + const struct of_device_id *match; + int rc; + + if (!root) + root = of_find_node_by_path("/"); + if (!root) + return -EINVAL; + if (!matches) + matches = __clk_of_table_start; + + for_each_matching_node_and_match(root, matches, &match) { + of_clk_init_cb_t clk_init_cb = (of_clk_init_cb_t)match->data; + rc = clk_init_cb(root); + if (rc) + pr_err("%s: failed to init clock for %s: %d\n", + __func__, root->full_name, rc); + } + + return 0; +} #endif static void dump_one(struct clk *clk, int verbose, int indent) diff --git a/include/linux/clk.h b/include/linux/clk.h index 4778400..af38c72 100644 --- a/include/linux/clk.h +++ b/include/linux/clk.h @@ -12,6 +12,7 @@ #define __LINUX_CLK_H #include +#include struct device_d; @@ -278,6 +279,11 @@ void clk_dump(int verbose); struct device_node; struct of_phandle_args; +#define CLK_OF_DECLARE(name, compat, fn) \ +const struct of_device_id __clk_of_table_##name \ +__attribute__ ((unused,section (".__clk_of_table_" __stringify(name)))) \ + = { .compatible = compat, .data = (u32)fn } + #if defined(CONFIG_OFTREE) && defined(CONFIG_COMMON_CLK_OF_PROVIDER) int of_clk_add_provider(struct device_node *np, struct clk *(*clk_src_get)(struct of_phandle_args *args, @@ -285,6 +291,8 @@ int of_clk_add_provider(struct device_node *np, void *data); void of_clk_del_provider(struct device_node *np); +typedef int (*of_clk_init_cb_t)(struct device_node *); + struct clk_onecell_data { struct clk **clks; unsigned int clk_num; @@ -295,6 +303,7 @@ struct clk *of_clk_src_simple_get(struct of_phandle_args *clkspec, void *data); 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); struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec); +int of_clk_init(struct device_node *root, const struct of_device_id *matches); #else static inline struct clk *of_clk_get(struct device_node *np, int index) { @@ -305,6 +314,11 @@ static inline struct clk *of_clk_get_by_name(struct device_node *np, { return ERR_PTR(-ENOENT); } +static inline int of_clk_init(struct device_node *root, + const struct of_device_id *matches) +{ + return 0; +} #endif #endif -- 1.8.4.rc3 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox