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@xxxxxx>
---
arch/arm/mach-omap2/prm.h | 1 +
arch/arm/mach-omap2/prm_common.c | 66 ++++++++++++++++++++++++++++++++++++++
2 files changed, 67 insertions(+)
diff --git a/arch/arm/mach-omap2/prm.h b/arch/arm/mach-omap2/prm.h
index ac25ae6..623db40 100644
--- 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 a2e1174..b4c4ab9 100644
--- 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;
+}
--
1.7.9.5
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