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authorGeert Uytterhoeven <geert+renesas@glider.be>2016-04-20 15:02:40 +0300
committerSimon Horman <horms+renesas@verge.net.au>2016-04-26 02:56:27 +0300
commit1c8c77f52d1037c61468539e1d68c44f9e710536 (patch)
tree23b0bcd29bed16d2a25977bf2f8732733b3bd298 /drivers/soc/renesas
parent2f024cef5b064d5498fe466dfe9492d46b5b12a4 (diff)
downloadlinux-1c8c77f52d1037c61468539e1d68c44f9e710536.tar.xz
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: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Diffstat (limited to 'drivers/soc/renesas')
-rw-r--r--drivers/soc/renesas/rcar-sysc.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/soc/renesas/rcar-sysc.c b/drivers/soc/renesas/rcar-sysc.c
index 4e760d63f2ab..0d49a25de740 100644
--- a/drivers/soc/renesas/rcar-sysc.c
+++ b/drivers/soc/renesas/rcar-sysc.c
@@ -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);