ARM: OMAP2+: PRM: add support for initializing PRCM clock modules from DT

This patch provides top level functionality for the DT clock initialization.
Clock tree is initialized hierarchically starting from IP modules (CM/PRM/PRCM)
going down towards individual clock nodes, and finally initializing
clockdomains once all the clocks are ready.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

diff --git a/arch/arm/mach-omap2/prm.h b/arch/arm/mach-omap2/prm.h
index ac25ae6667cf92c448d37a9fc25058d69f26be19..623db40fdbbda48c50888d620b6a8a28b8a27c17 100644 (file)
--- a/arch/arm/mach-omap2/prm.h
+++ b/arch/arm/mach-omap2/prm.h
@@ -18,6 +18,7 @@
 # ifndef __ASSEMBLER__
 extern void __iomem *prm_base;
 extern void omap2_set_globals_prm(void __iomem *prm);
+int of_prcm_init(void);
 # endif
 
 

diff --git a/arch/arm/mach-omap2/prm_common.c b/arch/arm/mach-omap2/prm_common.c
index a2e1174ad1b6a6632ad904e4a0b8c5f37dea1e79..b4c4ab9c8044476d0777ed04cb8c9595d2f29f83 100644 (file)
--- a/arch/arm/mach-omap2/prm_common.c
+++ b/arch/arm/mach-omap2/prm_common.c
@@ -23,6 +23,10 @@
 #include <linux/irq.h>
 #include <linux/interrupt.h>
 #include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/clk-provider.h>
+#include <linux/clk/ti.h>
 
 #include "soc.h"
 #include "prm2xxx_3xxx.h"
@@ -30,6 +34,7 @@
 #include "prm3xxx.h"
 #include "prm44xx.h"
 #include "common.h"
+#include "clock.h"
 
 /*
  * OMAP_PRCM_MAX_NR_PENDING_REG: maximum number of PRM_IRQ*_MPU regs
@@ -464,3 +469,64 @@ int prm_unregister(struct prm_ll_data *pld)
 
        return 0;
 }
+
+static struct of_device_id omap_prcm_dt_match_table[] = {
+       { .compatible = "ti,am3-prcm" },
+       { .compatible = "ti,am3-scrm" },
+       { .compatible = "ti,am4-prcm" },
+       { .compatible = "ti,am4-scrm" },
+       { .compatible = "ti,omap3-prm" },
+       { .compatible = "ti,omap3-cm" },
+       { .compatible = "ti,omap3-scrm" },
+       { .compatible = "ti,omap4-cm1" },
+       { .compatible = "ti,omap4-prm" },
+       { .compatible = "ti,omap4-cm2" },
+       { .compatible = "ti,omap4-scrm" },
+       { .compatible = "ti,omap5-prm" },
+       { .compatible = "ti,omap5-cm-core-aon" },
+       { .compatible = "ti,omap5-scrm" },
+       { .compatible = "ti,omap5-cm-core" },
+       { .compatible = "ti,dra7-prm" },
+       { .compatible = "ti,dra7-cm-core-aon" },
+       { .compatible = "ti,dra7-cm-core" },
+       { }
+};
+
+static struct clk_hw_omap memmap_dummy_ck = {
+       .flags = MEMMAP_ADDRESSING,
+};
+
+static u32 prm_clk_readl(void __iomem *reg)
+{
+       return omap2_clk_readl(&memmap_dummy_ck, reg);
+}
+
+static void prm_clk_writel(u32 val, void __iomem *reg)
+{
+       omap2_clk_writel(val, &memmap_dummy_ck, reg);
+}
+
+static struct ti_clk_ll_ops omap_clk_ll_ops = {
+       .clk_readl = prm_clk_readl,
+       .clk_writel = prm_clk_writel,
+};
+
+int __init of_prcm_init(void)
+{
+       struct device_node *np;
+       void __iomem *mem;
+       int memmap_index = 0;
+
+       ti_clk_ll_ops = &omap_clk_ll_ops;
+
+       for_each_matching_node(np, omap_prcm_dt_match_table) {
+               mem = of_iomap(np, 0);
+               clk_memmaps[memmap_index] = mem;
+               ti_dt_clk_init_provider(np, memmap_index);
+               memmap_index++;
+       }
+
+       ti_dt_clockdomains_setup();
+
+       return 0;
+}