linux-kernel - [PATCH 2/8] clk: renesas: r9a08g045: Add clocks, resets and power domain support for the PCIe

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Message-ID: <20250430103236.3511989-3-claudiu.beznea.uj@bp.renesas.com>
Date: Wed, 30 Apr 2025 13:32:30 +0300
From: Claudiu <claudiu.beznea@...on.dev>
To: bhelgaas@...gle.com,
	lpieralisi@...nel.org,
	kw@...ux.com,
	manivannan.sadhasivam@...aro.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	geert+renesas@...der.be,
	magnus.damm@...il.com,
	mturquette@...libre.com,
	sboyd@...nel.org,
	saravanak@...gle.com,
	p.zabel@...gutronix.de
Cc: claudiu.beznea@...on.dev,
	linux-pci@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-clk@...r.kernel.org,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: [PATCH 2/8] clk: renesas: r9a08g045: Add clocks, resets and power domain support for the PCIe

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

Add clocks, resets and power domains for the PCIe IP available on the
Renesas RZ/G3S SoC. The clkl1pm clock is required for PCIe link power
management (PM) control and should be enabled based on the state of the
CLKREQ# pin. Therefore, mark it as a no_pm clock to allow the PCIe driver
to manage it during link PM transitions.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
---
 drivers/clk/renesas/r9a08g045-cpg.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/clk/renesas/r9a08g045-cpg.c b/drivers/clk/renesas/r9a08g045-cpg.c
index 4035f3443598..33219164a19a 100644
--- a/drivers/clk/renesas/r9a08g045-cpg.c
+++ b/drivers/clk/renesas/r9a08g045-cpg.c
@@ -243,6 +243,8 @@ static const struct rzg2l_mod_clk r9a08g045_mod_clks[] = {
 	DEF_MOD("adc_adclk",		R9A08G045_ADC_ADCLK, R9A08G045_CLK_TSU, 0x5a8, 0),
 	DEF_MOD("adc_pclk",		R9A08G045_ADC_PCLK, R9A08G045_CLK_TSU, 0x5a8, 1),
 	DEF_MOD("tsu_pclk",		R9A08G045_TSU_PCLK, R9A08G045_CLK_TSU, 0x5ac, 0),
+	DEF_MOD("pci_aclk",		R9A08G045_PCI_ACLK, R9A08G045_CLK_M0, 0x608, 0),
+	DEF_MOD("pci_clk1pm",		R9A08G045_PCI_CLKL1PM, R9A08G045_CLK_ZT, 0x608, 1),
 	DEF_MOD("vbat_bclk",		R9A08G045_VBAT_BCLK, R9A08G045_OSCCLK, 0x614, 0),
 };
 
@@ -282,6 +284,13 @@ static const struct rzg2l_reset r9a08g045_resets[] = {
 	DEF_RST(R9A08G045_ADC_PRESETN, 0x8a8, 0),
 	DEF_RST(R9A08G045_ADC_ADRST_N, 0x8a8, 1),
 	DEF_RST(R9A08G045_TSU_PRESETN, 0x8ac, 0),
+	DEF_RST(R9A08G045_PCI_ARESETN, 0x908, 0),
+	DEF_RST(R9A08G045_PCI_RST_B, 0x908, 1),
+	DEF_RST(R9A08G045_PCI_RST_GP_B, 0x908, 2),
+	DEF_RST(R9A08G045_PCI_RST_PS_B, 0x908, 3),
+	DEF_RST(R9A08G045_PCI_RST_RSM_B, 0x908, 4),
+	DEF_RST(R9A08G045_PCI_RST_CFG_B, 0x908, 5),
+	DEF_RST(R9A08G045_PCI_RST_LOAD_B, 0x908, 6),
 	DEF_RST(R9A08G045_VBAT_BRESETN, 0x914, 0),
 };
 
@@ -358,6 +367,8 @@ static const struct rzg2l_cpg_pm_domain_init_data r9a08g045_pm_domains[] = {
 				DEF_REG_CONF(CPG_BUS_MCPU2_MSTOP, BIT(14)), 0),
 	DEF_PD("tsu",		R9A08G045_PD_TSU,
 				DEF_REG_CONF(CPG_BUS_MCPU2_MSTOP, BIT(15)), 0),
+	DEF_PD("pci",		R9A08G045_PD_PCI,
+				DEF_REG_CONF(CPG_BUS_PERI_COM_MSTOP, BIT(10)), 0),
 	DEF_PD("vbat",		R9A08G045_PD_VBAT,
 				DEF_REG_CONF(CPG_BUS_MCPU3_MSTOP, BIT(8)),
 				GENPD_FLAG_ALWAYS_ON),
@@ -365,6 +376,10 @@ static const struct rzg2l_cpg_pm_domain_init_data r9a08g045_pm_domains[] = {
 				DEF_REG_CONF(CPG_BUS_MCPU3_MSTOP, BIT(7)), 0),
 };
 
+static const unsigned int r9a08g045_no_pm_mod_clks[] = {
+	MOD_CLK_BASE + R9A08G045_PCI_CLKL1PM,
+};
+
 const struct rzg2l_cpg_info r9a08g045_cpg_info = {
 	/* Core Clocks */
 	.core_clks = r9a08g045_core_clks,
@@ -381,6 +396,10 @@ const struct rzg2l_cpg_info r9a08g045_cpg_info = {
 	.num_mod_clks = ARRAY_SIZE(r9a08g045_mod_clks),
 	.num_hw_mod_clks = R9A08G045_VBAT_BCLK + 1,
 
+	/* No PM modules Clocks */
+	.no_pm_mod_clks = r9a08g045_no_pm_mod_clks,
+	.num_no_pm_mod_clks = ARRAY_SIZE(r9a08g045_no_pm_mod_clks),
+
 	/* Resets */
 	.resets = r9a08g045_resets,
 	.num_resets = R9A08G045_VBAT_BRESETN + 1, /* Last reset ID + 1 */
-- 
2.43.0