[PATCH v2 07/10] clk: renesas: r9a08g045: Add support for power domains

[Claudiu <claudiu.beznea@tuxon.dev>]

From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>

Instantiate power domains for the currently enabled IPs of R9A08G045 SoC.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
---

Change in v2:
- used DEF_REG_CONF() to describe register offests and bits
- updated MSTOP bitmask for ddr domain
- updated MSTOP config for oftde_ddr
- kept the same description for gic as the CPG_BUS_ACPU_MSTOP register
  documentation in the latest HW manual version is wrong and it will be
  fixed; proper description for GIC is located in "Registers for Module
  Standby Mode" table
- haven't added watchdog domain (was missing in v1, too, by mistake) as
  the watchdog restart handler will fail w/o patch [1]; with this pm domain
  support the watchdog will fail to probe; not sure what is the best
  option until [1] will be integrated

[1] https://patchwork.kernel.org/project/linux-renesas-soc/patch/20240228083253.2640997-10-claudiu.beznea.uj@bp.renesas.com

 drivers/clk/renesas/r9a08g045-cpg.c | 61 +++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/drivers/clk/renesas/r9a08g045-cpg.c b/drivers/clk/renesas/r9a08g045-cpg.c
index c3e6da2de197..c64769082f5b 100644
--- a/drivers/clk/renesas/r9a08g045-cpg.c
+++ b/drivers/clk/renesas/r9a08g045-cpg.c
@@ -240,6 +240,62 @@ static const unsigned int r9a08g045_crit_mod_clks[] __initconst = {
 	MOD_CLK_BASE + R9A08G045_DMAC_ACLK,
 };
 
+static const struct rzg2l_cpg_pm_domain_init_data r9a08g045_pm_domains[] = {
+	/* Keep always-on domain on the first position for proper domains registration. */
+	DEF_PD("always-on",	R9A08G045_PD_ALWAYS_ON,
+				DEF_REG_CONF(0, 0),
+				DEF_REG_CONF(0, 0),
+				RZG2L_PD_F_ALWAYS_ON),
+	DEF_PD("gic",		R9A08G045_PD_GIC,
+				DEF_REG_CONF(CPG_BUS_ACPU_MSTOP, BIT(3)),
+				DEF_REG_CONF(CPG_PWRDN_IP1, BIT(2)),
+				RZG2L_PD_F_ALWAYS_ON),
+	DEF_PD("ia55",		R9A08G045_PD_IA55,
+				DEF_REG_CONF(CPG_BUS_PERI_CPU_MSTOP, BIT(13)),
+				DEF_REG_CONF(CPG_PWRDN_IP1, BIT(3)),
+				RZG2L_PD_F_ALWAYS_ON),
+	DEF_PD("dmac",		R9A08G045_PD_DMAC,
+				DEF_REG_CONF(CPG_BUS_REG1_MSTOP, GENMASK(3, 0)),
+				DEF_REG_CONF(0, 0),
+				RZG2L_PD_F_ALWAYS_ON),
+	DEF_PD("ddr",		R9A08G045_PD_DDR,
+				DEF_REG_CONF(CPG_BUS_PERI_DDR_MSTOP, GENMASK(1, 0)),
+				DEF_REG_CONF(CPG_PWRDN_IP2, BIT(0)),
+				RZG2L_PD_F_ALWAYS_ON),
+	DEF_PD("tzcddr",	R9A08G045_PD_TZCDDR,
+				DEF_REG_CONF(CPG_BUS_TZCDDR_MSTOP, GENMASK(2, 0)),
+				DEF_REG_CONF(CPG_PWRDN_IP2, BIT(1)),
+				RZG2L_PD_F_ALWAYS_ON),
+	DEF_PD("otfde_ddr",	R9A08G045_PD_OTFDE_DDR,
+				DEF_REG_CONF(CPG_BUS_PERI_CPU2_MSTOP, BIT(2)),
+				DEF_REG_CONF(CPG_PWRDN_IP2, BIT(2)),
+				RZG2L_PD_F_ALWAYS_ON),
+	DEF_PD("sdhi0",		R9A08G045_PD_SDHI0,
+				DEF_REG_CONF(CPG_BUS_PERI_COM_MSTOP, BIT(0)),
+				DEF_REG_CONF(CPG_PWRDN_IP1, BIT(13)),
+				RZG2L_PD_F_NONE),
+	DEF_PD("sdhi1",		R9A08G045_PD_SDHI1,
+				DEF_REG_CONF(CPG_BUS_PERI_COM_MSTOP, BIT(1)),
+				DEF_REG_CONF(CPG_PWRDN_IP1, BIT(14)),
+				RZG2L_PD_F_NONE),
+	DEF_PD("sdhi2",		R9A08G045_PD_SDHI2,
+				DEF_REG_CONF(CPG_BUS_PERI_COM_MSTOP, BIT(11)),
+				DEF_REG_CONF(CPG_PWRDN_IP1, BIT(15)),
+				RZG2L_PD_F_NONE),
+	DEF_PD("eth0",		R9A08G045_PD_ETHER0,
+				DEF_REG_CONF(CPG_BUS_PERI_COM_MSTOP, BIT(2)),
+				DEF_REG_CONF(CPG_PWRDN_IP1, BIT(11)),
+				RZG2L_PD_F_NONE),
+	DEF_PD("eth1",		R9A08G045_PD_ETHER1,
+				DEF_REG_CONF(CPG_BUS_PERI_COM_MSTOP, BIT(3)),
+				DEF_REG_CONF(CPG_PWRDN_IP1, BIT(12)),
+				RZG2L_PD_F_NONE),
+	DEF_PD("scif0",		R9A08G045_PD_SCIF0,
+				DEF_REG_CONF(CPG_BUS_MCPU2_MSTOP, BIT(1)),
+				DEF_REG_CONF(0, 0),
+				RZG2L_PD_F_NONE),
+};
+
 const struct rzg2l_cpg_info r9a08g045_cpg_info = {
 	/* Core Clocks */
 	.core_clks = r9a08g045_core_clks,
@@ -260,5 +316,10 @@ const struct rzg2l_cpg_info r9a08g045_cpg_info = {
 	.resets = r9a08g045_resets,
 	.num_resets = R9A08G045_VBAT_BRESETN + 1, /* Last reset ID + 1 */
 
+	/* Power domains */
+	.pm_domains = r9a08g045_pm_domains,
+	.num_pm_domains = ARRAY_SIZE(r9a08g045_pm_domains),
+	.pm_domain_pwrdn_mstop = true,
+
 	.has_clk_mon_regs = true,
 };
-- 
2.39.2