Commit 943a63a4 authored by Tero Kristo's avatar Tero Kristo Committed by Mike Turquette
Browse files

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: default avatarTero Kristo <t-kristo@ti.com>
Acked-by: default avatarTony Lindgren <tony@atomide.com>
Signed-off-by: default avatarMike Turquette <mturquette@linaro.org>
parent 0385c582

arch/arm/mach-omap2/prm.h

+1 −0
Original line number Diff line number Diff line
@@ -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

arch/arm/mach-omap2/prm_common.c

+66 −0
Original line number Diff line number Diff line
@@ -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;

}

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