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Commit 1c8c77f5 authored by Geert Uytterhoeven's avatar Geert Uytterhoeven Committed by Simon Horman
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soc: renesas: rcar-sysc: Enable Clock Domain for I/O devices 



On R-Car H3, some power areas (e.g. A3VP) contain I/O devices, which are
also part of the CPG/MSSR Clock Domain.
On all R-Car SoCs, devices in the "always-on" PM Domain are part of the
Clock Domain served by the CPG/MSSR or CPG/MSTP driver.

Hook up the CPG/MSTP or CPG/MSSR Clock Domain attach/detach callbacks to
enable power management using module clocks. Which callback to hook up
depends on the presence of device nodes compatible with
"renesas,cpg-mstp-clocks". This clears the path for a future migration
from the CPG/MSTP to the CPG/MSSR driver on R-Car H1 and
Gen2.

Signed-off-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: default avatarSimon Horman <horms+renesas@verge.net.au>
parent 2f024cef

drivers/soc/renesas/rcar-sysc.c

+18 −0
Original line number Diff line number Diff line
@@ -9,6 +9,7 @@ 
 * for more details.

 */



#include <linux/clk/renesas.h>

#include <linux/delay.h>

#include <linux/err.h>

#include <linux/mm.h>
@@ -217,6 +218,8 @@ static int rcar_sysc_pd_power_on(struct generic_pm_domain *genpd) 
	return rcar_sysc_power_up(&pd->ch);

}



static bool has_cpg_mstp;



static void __init rcar_sysc_pd_setup(struct rcar_sysc_pd *pd)

{

	struct generic_pm_domain *genpd = &pd->genpd;
@@ -248,6 +251,18 @@ static void __init rcar_sysc_pd_setup(struct rcar_sysc_pd *pd) 
		gov = &pm_domain_always_on_gov;

	}



	if (!(pd->flags & (PD_CPU | PD_SCU))) {

		/* Enable Clock Domain for I/O devices */

		genpd->flags = GENPD_FLAG_PM_CLK;

		if (has_cpg_mstp) {

			genpd->attach_dev = cpg_mstp_attach_dev;

			genpd->detach_dev = cpg_mstp_detach_dev;

		} else {

			genpd->attach_dev = cpg_mssr_attach_dev;

			genpd->detach_dev = cpg_mssr_detach_dev;

		}

	}



	genpd->power_off = rcar_sysc_pd_power_off;

	genpd->power_on = rcar_sysc_pd_power_on;
@@ -294,6 +309,9 @@ static int __init rcar_sysc_pd_init(void) 


	info = match->data;



	has_cpg_mstp = of_find_compatible_node(NULL, NULL,

					       "renesas,cpg-mstp-clocks");



	base = of_iomap(np, 0);

	if (!base) {

		pr_warn("%s: Cannot map regs\n", np->full_name);