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

Claudiu
2025-07-04T16:34:07Z

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