linux-kernel - [PATCH v3 2/9] clk: renesas: r9a08g045: Add clocks and resets support for PCIe

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Message-ID: <20250704161410.3931884-3-claudiu.beznea.uj@bp.renesas.com>
Date: Fri,  4 Jul 2025 19:14:02 +0300
From: Claudiu <claudiu.beznea@...on.dev>
To: bhelgaas@...gle.com,
	lpieralisi@...nel.org,
	kwilczynski@...nel.org,
	mani@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	geert+renesas@...der.be,
	magnus.damm@...il.com,
	catalin.marinas@....com,
	will@...nel.org,
	mturquette@...libre.com,
	sboyd@...nel.org,
	p.zabel@...gutronix.de,
	lizhi.hou@....com
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>,
	Wolfram Sang <wsa+renesas@...g-engineering.com>
Subject: [PATCH v3 2/9] clk: renesas: r9a08g045: Add clocks and resets support for PCIe

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

Add clocks and resets 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.

Tested-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
---

Changes in v3:
- collected tags
- dropped the power domain support and added MSTOP as power domain
  code is not available anymore in the current linux-next
- adjusted the patch title and description

Changes in v2:
- none

 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 405907925bb7..4a6632ea22cb 100644
--- a/drivers/clk/renesas/r9a08g045-cpg.c
+++ b/drivers/clk/renesas/r9a08g045-cpg.c
@@ -289,6 +289,10 @@ static const struct rzg2l_mod_clk r9a08g045_mod_clks[] = {
 					MSTOP(BUS_MCPU2, BIT(14))),
 	DEF_MOD("tsu_pclk",		R9A08G045_TSU_PCLK, R9A08G045_CLK_TSU, 0x5ac, 0,
 					MSTOP(BUS_MCPU2, BIT(15))),
+	DEF_MOD("pci_aclk",		R9A08G045_PCI_ACLK, R9A08G045_CLK_M0, 0x608, 0,
+					MSTOP(BUS_PERI_COM, BIT(10))),
+	DEF_MOD("pci_clk1pm",		R9A08G045_PCI_CLKL1PM, R9A08G045_CLK_ZT, 0x608, 1,
+					MSTOP(BUS_PERI_COM, BIT(10))),
 	DEF_MOD("vbat_bclk",		R9A08G045_VBAT_BCLK, R9A08G045_OSCCLK, 0x614, 0,
 					MSTOP(BUS_MCPU3, GENMASK(8, 7))),
 };
@@ -329,6 +333,13 @@ 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),
 };
 
@@ -340,6 +351,10 @@ static const unsigned int r9a08g045_crit_mod_clks[] __initconst = {
 	MOD_CLK_BASE + R9A08G045_VBAT_BCLK,
 };
 
+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,
@@ -356,6 +371,10 @@ 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