clk: ux500: Provide u8500_clk with skeleton Device Tree support

The functional components will be added on a per-clock basis.

Acked-by: Mike Turquette <mturquette@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/clk/ux500/u8500_of_clk.c b/drivers/clk/ux500/u8500_of_clk.c
index ceebce6a624ff0dd736c3544b4f822d0a9738e78..bfbe3cae72d7a573f75ef2b590655add854171af 100644 (file)
--- a/drivers/clk/ux500/u8500_of_clk.c
+++ b/drivers/clk/ux500/u8500_of_clk.c
@@ -7,6 +7,7 @@
  * License terms: GNU General Public License (GPL) version 2
  */
 
+#include <linux/of.h>
 #include <linux/clk.h>
 #include <linux/clkdev.h>
 #include <linux/clk-provider.h>
@@ -14,13 +15,27 @@
 #include <linux/platform_data/clk-ux500.h>
 #include "clk.h"
 
+static const struct of_device_id u8500_clk_of_match[] = {
+       { .compatible = "stericsson,u8500-clks", },
+       { },
+};
+
 void u8500_of_clk_init(u32 clkrst1_base, u32 clkrst2_base, u32 clkrst3_base,
                       u32 clkrst5_base, u32 clkrst6_base)
 {
        struct prcmu_fw_version *fw_version;
+       struct device_node *np = NULL;
+       struct device_node *child = NULL;
        const char *sgaclk_parent = NULL;
        struct clk *clk;
 
+       if (of_have_populated_dt())
+               np = of_find_matching_node(NULL, u8500_clk_of_match);
+       if (!np) {
+               pr_err("Either DT or U8500 Clock node not found\n");
+               return;
+       }
+
        /* Clock sources */
        clk = clk_reg_prcmu_gate("soc0_pll", NULL, PRCMU_PLLSOC0,
                                CLK_IS_ROOT|CLK_IGNORE_UNUSED);
@@ -378,4 +393,8 @@ void u8500_of_clk_init(u32 clkrst1_base, u32 clkrst2_base, u32 clkrst3_base,
        /* Periph6 */
        clk = clk_reg_prcc_kclk("p3_rng_kclk", "rngclk",
                        clkrst6_base, BIT(0), CLK_SET_RATE_GATE);
+
+       for_each_child_of_node(np, child) {
+               /* Place holder for supported nodes. */
+       }
 }