[PATCH 2/4] clk: mmp: pxa1908-apbc: Add reset cells
From: Duje Mihanović
Date: Tue Apr 14 2026 - 15:56:53 EST
From: Duje Mihanović <duje@xxxxxxxxxxxxxxxxx>
It has been concluded by comparing the gate clock masks and vendor code
between PXA1908/28 that PXA1908's APBC, similarly to PXA1928's APBC, has
controllable reset lines. Describe these in the driver for correctness.
Signed-off-by: Duje Mihanović <duje@xxxxxxxxxxxxxxxxx>
---
drivers/clk/mmp/clk-pxa1908-apbc.c | 58 +++++++++++++++++++++++++++++---------
1 file changed, 44 insertions(+), 14 deletions(-)
diff --git a/drivers/clk/mmp/clk-pxa1908-apbc.c b/drivers/clk/mmp/clk-pxa1908-apbc.c
index 3fd7b5e644f3..438ece4f047d 100644
--- a/drivers/clk/mmp/clk-pxa1908-apbc.c
+++ b/drivers/clk/mmp/clk-pxa1908-apbc.c
@@ -7,6 +7,7 @@
#include <dt-bindings/clock/marvell,pxa1908.h>
#include "clk.h"
+#include "reset.h"
#define APBC_UART0 0x0
#define APBC_UART1 0x4
@@ -44,22 +45,25 @@ static const char * const uart_parent_names[] = {"pll1_117", "uart_pll"};
static const char * const ssp_parent_names[] = {"pll1_d16", "pll1_d48", "pll1_d24", "pll1_d12"};
static struct mmp_param_gate_clk apbc_gate_clks[] = {
- {PXA1908_CLK_TWSI0, "twsi0_clk", "pll1_32", CLK_SET_RATE_PARENT, APBC_TWSI0, 0x7, 3, 0, 0, NULL},
- {PXA1908_CLK_TWSI1, "twsi1_clk", "pll1_32", CLK_SET_RATE_PARENT, APBC_TWSI1, 0x7, 3, 0, 0, NULL},
- {PXA1908_CLK_TWSI3, "twsi3_clk", "pll1_32", CLK_SET_RATE_PARENT, APBC_TWSI3, 0x7, 3, 0, 0, NULL},
- {PXA1908_CLK_GPIO, "gpio_clk", "vctcxo", CLK_SET_RATE_PARENT, APBC_GPIO, 0x7, 3, 0, 0, NULL},
- {PXA1908_CLK_KPC, "kpc_clk", "clk32", CLK_SET_RATE_PARENT, APBC_KPC, 0x7, 3, 0, MMP_CLK_GATE_NEED_DELAY, NULL},
- {PXA1908_CLK_RTC, "rtc_clk", "clk32", CLK_SET_RATE_PARENT, APBC_RTC, 0x87, 0x83, 0, MMP_CLK_GATE_NEED_DELAY, NULL},
+ {PXA1908_CLK_TWSI0, "twsi0_clk", "pll1_32", CLK_SET_RATE_PARENT, APBC_TWSI0, 0x3, 3, 0, 0, NULL},
+ {PXA1908_CLK_TWSI1, "twsi1_clk", "pll1_32", CLK_SET_RATE_PARENT, APBC_TWSI1, 0x3, 3, 0, 0, NULL},
+ {PXA1908_CLK_TWSI3, "twsi3_clk", "pll1_32", CLK_SET_RATE_PARENT, APBC_TWSI3, 0x3, 3, 0, 0, NULL},
+ {PXA1908_CLK_GPIO, "gpio_clk", "vctcxo", CLK_SET_RATE_PARENT, APBC_GPIO, 0x3, 3, 0, 0, NULL},
+ {PXA1908_CLK_KPC, "kpc_clk", "clk32", CLK_SET_RATE_PARENT, APBC_KPC, 0x3, 3, 0, MMP_CLK_GATE_NEED_DELAY, NULL},
+ {PXA1908_CLK_RTC, "rtc_clk", "clk32", CLK_SET_RATE_PARENT, APBC_RTC, 0x83, 0x83, 0, MMP_CLK_GATE_NEED_DELAY, NULL},
+ {PXA1908_CLK_PWM1, "pwm1_clk", "pwm01_apb_share", CLK_SET_RATE_PARENT, APBC_PWM1, 0x2, 2, 0, 0, NULL},
+ {PXA1908_CLK_PWM3, "pwm3_clk", "pwm23_apb_share", CLK_SET_RATE_PARENT, APBC_PWM3, 0x2, 2, 0, 0, NULL},
+ {PXA1908_CLK_UART0, "uart0_clk", "uart0_mux", CLK_SET_RATE_PARENT, APBC_UART0, 0x3, 3, 0, 0, &uart0_lock},
+ {PXA1908_CLK_UART1, "uart1_clk", "uart1_mux", CLK_SET_RATE_PARENT, APBC_UART1, 0x3, 3, 0, 0, &uart1_lock},
+ {PXA1908_CLK_THERMAL, "thermal_clk", NULL, 0, APBC_THERMAL, 0x3, 3, 0, 0, NULL},
+ {PXA1908_CLK_IPC_RST, "ipc_clk", NULL, 0, APBC_IPC_RST, 0x3, 3, 0, 0, NULL},
+ {PXA1908_CLK_SSP0, "ssp0_clk", "ssp0_mux", 0, APBC_SSP0, 0x3, 3, 0, 0, NULL},
+ {PXA1908_CLK_SSP2, "ssp2_clk", "ssp2_mux", 0, APBC_SSP2, 0x3, 3, 0, 0, NULL},
+};
+
+static struct mmp_param_gate_clk apbc_gate_no_reset_clks[] = {
{PXA1908_CLK_PWM0, "pwm0_clk", "pwm01_apb_share", CLK_SET_RATE_PARENT, APBC_PWM0, 0x2, 2, 0, 0, &pwm0_lock},
- {PXA1908_CLK_PWM1, "pwm1_clk", "pwm01_apb_share", CLK_SET_RATE_PARENT, APBC_PWM1, 0x6, 2, 0, 0, NULL},
{PXA1908_CLK_PWM2, "pwm2_clk", "pwm23_apb_share", CLK_SET_RATE_PARENT, APBC_PWM2, 0x2, 2, 0, 0, NULL},
- {PXA1908_CLK_PWM3, "pwm3_clk", "pwm23_apb_share", CLK_SET_RATE_PARENT, APBC_PWM3, 0x6, 2, 0, 0, NULL},
- {PXA1908_CLK_UART0, "uart0_clk", "uart0_mux", CLK_SET_RATE_PARENT, APBC_UART0, 0x7, 3, 0, 0, &uart0_lock},
- {PXA1908_CLK_UART1, "uart1_clk", "uart1_mux", CLK_SET_RATE_PARENT, APBC_UART1, 0x7, 3, 0, 0, &uart1_lock},
- {PXA1908_CLK_THERMAL, "thermal_clk", NULL, 0, APBC_THERMAL, 0x7, 3, 0, 0, NULL},
- {PXA1908_CLK_IPC_RST, "ipc_clk", NULL, 0, APBC_IPC_RST, 0x7, 3, 0, 0, NULL},
- {PXA1908_CLK_SSP0, "ssp0_clk", "ssp0_mux", 0, APBC_SSP0, 0x7, 3, 0, 0, NULL},
- {PXA1908_CLK_SSP2, "ssp2_clk", "ssp2_mux", 0, APBC_SSP2, 0x7, 3, 0, 0, NULL},
};
static struct mmp_param_mux_clk apbc_mux_clks[] = {
@@ -89,6 +93,30 @@ static void pxa1908_apb_periph_clk_init(struct pxa1908_clk_unit *pxa_unit)
ARRAY_SIZE(apbc_mux_clks));
mmp_register_gate_clks(unit, apbc_gate_clks, pxa_unit->base,
ARRAY_SIZE(apbc_gate_clks));
+ mmp_register_gate_clks(unit, apbc_gate_no_reset_clks, pxa_unit->base,
+ ARRAY_SIZE(apbc_gate_no_reset_clks));
+}
+
+/* Taken from clk-of-pxa1928.c */
+static void pxa1908_clk_reset_init(struct device_node *np,
+ struct pxa1908_clk_unit *pxa_unit)
+{
+ struct mmp_clk_reset_cell *cells;
+ int nr_cells = ARRAY_SIZE(apbc_gate_clks);
+
+ cells = kzalloc_objs(*cells, nr_cells);
+ if (!cells)
+ return;
+
+ for (int i = 0; i < nr_cells; i++) {
+ cells[i].clk_id = apbc_gate_clks[i].id;
+ cells[i].reg = pxa_unit->base + apbc_gate_clks[i].offset;
+ cells[i].bits = BIT(2);
+ cells[i].flags = 0;
+ cells[i].lock = apbc_gate_clks[i].lock;
+ };
+
+ mmp_clk_reset_register(np, cells, nr_cells);
}
static int pxa1908_apbc_probe(struct platform_device *pdev)
@@ -107,6 +135,8 @@ static int pxa1908_apbc_probe(struct platform_device *pdev)
pxa1908_apb_periph_clk_init(pxa_unit);
+ pxa1908_clk_reset_init(pdev->dev.of_node, pxa_unit);
+
return 0;
}
--
2.53.0