[PATCH RFT 2/2] clk: sunxi-ng: a523: use single-divider clock helpers

Enzo Adriano <[email protected]>
Newsgroups org.kernel.vger.linux-clk,dev.linux.lists.linux-sunxi,org.infradead.lists.linux-arm-kernel,org.kernel.vger.linux-kernel
Message-ID <[email protected]> 
The A523 MBUS, IOMMU, and DRAM clocks have an M divider but no P
divider, while HSTIMER0-5 and R-TIMER0-2 have a P divider but no M
divider. They currently use the two-divider ccu_mp class by declaring
the missing field with width zero.

ccu_mp_set_rate() unconditionally masks both divider fields, so a zero
width forms an invalid GENMASK() range and can clear unrelated register
bits. The M-only clocks also require the hardware update bit, which
ccu_mp operations do not handle.

Use the single-divider M helper for MBUS, IOMMU, and DRAM, and the
power-of-two P helper for the timer clocks. Preserve the parents,
registers, real divider fields, muxes, gates, clock flags, and
update-bit features.

Reported-by: Sashiko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Link: https://lore.kernel.org/r/[email protected]
Suggested-by: Chen-Yu Tsai <[email protected]>
Fixes: 6702d17f54a8 ("clk: sunxi-ng: a523: add video mod clocks")
Fixes: 74b0443a0d0a ("clk: sunxi-ng: a523: add system mod clocks")
Fixes: 8cea339cfb81 ("clk: sunxi-ng: add support for the A523/T527 PRCM CCU")
Link: https://lore.kernel.org/r/CAGb2v67GDBTq8vdxNxBfNVSe=oStcgaJzm0ig2WAEXNQSkVa1g@mail.gmail.com
Link: https://lore.kernel.org/r/[email protected]
Assisted-by: Codex:gpt-5
Signed-off-by: Enzo Adriano <[email protected]>
---
not tested on A523/T527 hardware; testing on actual hardware is needed.

 drivers/clk/sunxi-ng/ccu-sun55i-a523-r.c |  37 +++---
 drivers/clk/sunxi-ng/ccu-sun55i-a523.c   | 136 +++++++++++------------
 2 files changed, 82 insertions(+), 91 deletions(-)

diff --git a/drivers/clk/sunxi-ng/ccu-sun55i-a523-r.c b/drivers/clk/sunxi-ng/ccu-sun55i-a523-r.c
index db0e36d8838e74..349230e28c1c3a 100644
--- a/drivers/clk/sunxi-ng/ccu-sun55i-a523-r.c
+++ b/drivers/clk/sunxi-ng/ccu-sun55i-a523-r.c
@@ -43,27 +43,24 @@ static SUNXI_CCU_M_DATA_WITH_MUX(r_apb1_clk, "r-apb1",
 				 24, 3,	/* mux */
 				 0);
 
-static SUNXI_CCU_MP_DATA_WITH_MUX_GATE(r_cpu_timer0, "r-timer0",
-				       r_ahb_apb_parents, 0x100,
-				       0, 0,	/* no M */
-				       1, 3,	/* P */
-				       4, 3,	/* mux */
-				       BIT(0),
+static SUNXI_CCU_P_DATA_WITH_MUX_GATE(r_cpu_timer0, "r-timer0",
+				      r_ahb_apb_parents, 0x100,
+				      1, 3,	/* P */
+				      4, 3,	/* mux */
+				      BIT(0),
+				      0);
+static SUNXI_CCU_P_DATA_WITH_MUX_GATE(r_cpu_timer1, "r-timer1",
+				      r_ahb_apb_parents, 0x104,
+				      1, 3,	/* P */
+				      4, 3,	/* mux */
+				      BIT(0),
+				      0);
+static SUNXI_CCU_P_DATA_WITH_MUX_GATE(r_cpu_timer2, "r-timer2",
+				      r_ahb_apb_parents, 0x108,
+				      1, 3,	/* P */
+				      4, 3,	/* mux */
+				      BIT(0),
 				      0);
-static SUNXI_CCU_MP_DATA_WITH_MUX_GATE(r_cpu_timer1, "r-timer1",
-				       r_ahb_apb_parents, 0x104,
-				       0, 0,	/* no M */
-				       1, 3,	/* P */
-				       4, 3,	/* mux */
-				       BIT(0),
-				       0);
-static SUNXI_CCU_MP_DATA_WITH_MUX_GATE(r_cpu_timer2, "r-timer2",
-				       r_ahb_apb_parents, 0x108,
-				       0, 0,	/* no M */
-				       1, 3,	/* P */
-				       4, 3,	/* mux */
-				       BIT(0),
-				       0);
 
 static SUNXI_CCU_GATE_HW(bus_r_timer_clk, "bus-r-timer", &r_ahb_clk.common.hw,
 			 0x11c, BIT(0), 0);
diff --git a/drivers/clk/sunxi-ng/ccu-sun55i-a523.c b/drivers/clk/sunxi-ng/ccu-sun55i-a523.c
index 20dad06b37ca31..5c632e475aaa04 100644
--- a/drivers/clk/sunxi-ng/ccu-sun55i-a523.c
+++ b/drivers/clk/sunxi-ng/ccu-sun55i-a523.c
@@ -380,14 +380,14 @@ static const struct clk_parent_data mbus_parents[] = {
 	{ .hw = &pll_periph1_150M_clk.hw },
 	{ .fw_name = "hosc" },
 };
-static SUNXI_CCU_MP_DATA_WITH_MUX_GATE_FEAT(mbus_clk, "mbus", mbus_parents,
-					    0x540,
-					    0, 5,		/* M */
-					    0, 0,		/* no P */
-					    24, 3,	/* mux */
-					    BIT(31),	/* gate */
-					    CLK_IS_CRITICAL,
-					    CCU_FEATURE_UPDATE_BIT);
+
+static SUNXI_CCU_M_DATA_WITH_MUX_GATE_FEAT(mbus_clk, "mbus", mbus_parents,
+					   0x540,
+					   0, 5,	/* M */
+					   24, 3,	/* mux */
+					   BIT(31),	/* gate */
+					   CLK_IS_CRITICAL,
+					   CCU_FEATURE_UPDATE_BIT);
 
 static const struct clk_hw *mbus_hws[] = { &mbus_clk.common.hw };
 
@@ -513,58 +513,53 @@ static const struct clk_parent_data hstimer_parents[] = {
 	{ .fw_name = "losc" },
 	{ .hw = &pll_periph0_200M_clk.hw },
 };
-static SUNXI_CCU_MP_DATA_WITH_MUX_GATE(hstimer0_clk, "hstimer0",
-				       hstimer_parents, 0x730,
-				       0, 0,	/* M */
-				       0, 3,	/* P */
-				       24, 3,	/* mux */
-				       BIT(31),	/* gate */
-				       0);
 
-static SUNXI_CCU_MP_DATA_WITH_MUX_GATE(hstimer1_clk, "hstimer1",
-				       hstimer_parents,
-				       0x734,
-				       0, 0,	/* M */
-				       0, 3,	/* P */
-				       24, 3,	/* mux */
-				       BIT(31),	/* gate */
-				       0);
+static SUNXI_CCU_P_DATA_WITH_MUX_GATE(hstimer0_clk, "hstimer0",
+				      hstimer_parents, 0x730,
+				      0, 3,	/* P */
+				      24, 3,	/* mux */
+				      BIT(31),	/* gate */
+				      0);
 
-static SUNXI_CCU_MP_DATA_WITH_MUX_GATE(hstimer2_clk, "hstimer2",
-				       hstimer_parents,
-				       0x738,
-				       0, 0,	/* M */
-				       0, 3,	/* P */
-				       24, 3,	/* mux */
-				       BIT(31),	/* gate */
-				       0);
+static SUNXI_CCU_P_DATA_WITH_MUX_GATE(hstimer1_clk, "hstimer1",
+				      hstimer_parents,
+				      0x734,
+				      0, 3,	/* P */
+				      24, 3,	/* mux */
+				      BIT(31),	/* gate */
+				      0);
 
-static SUNXI_CCU_MP_DATA_WITH_MUX_GATE(hstimer3_clk, "hstimer3",
-				       hstimer_parents,
-				       0x73c,
-				       0, 0,	/* M */
-				       0, 3,	/* P */
-				       24, 3,	/* mux */
-				       BIT(31),	/* gate */
-				       0);
+static SUNXI_CCU_P_DATA_WITH_MUX_GATE(hstimer2_clk, "hstimer2",
+				      hstimer_parents,
+				      0x738,
+				      0, 3,	/* P */
+				      24, 3,	/* mux */
+				      BIT(31),	/* gate */
+				      0);
 
-static SUNXI_CCU_MP_DATA_WITH_MUX_GATE(hstimer4_clk, "hstimer4",
-				       hstimer_parents,
-				       0x740,
-				       0, 0,	/* M */
-				       0, 3,	/* P */
-				       24, 3,	/* mux */
-				       BIT(31),	/* gate */
-				       0);
+static SUNXI_CCU_P_DATA_WITH_MUX_GATE(hstimer3_clk, "hstimer3",
+				      hstimer_parents,
+				      0x73c,
+				      0, 3,	/* P */
+				      24, 3,	/* mux */
+				      BIT(31),	/* gate */
+				      0);
 
-static SUNXI_CCU_MP_DATA_WITH_MUX_GATE(hstimer5_clk, "hstimer5",
-				       hstimer_parents,
-				       0x744,
-				       0, 0,	/* M */
-				       0, 3,	/* P */
-				       24, 3,	/* mux */
-				       BIT(31),	/* gate */
-				       0);
+static SUNXI_CCU_P_DATA_WITH_MUX_GATE(hstimer4_clk, "hstimer4",
+				      hstimer_parents,
+				      0x740,
+				      0, 3,	/* P */
+				      24, 3,	/* mux */
+				      BIT(31),	/* gate */
+				      0);
+
+static SUNXI_CCU_P_DATA_WITH_MUX_GATE(hstimer5_clk, "hstimer5",
+				      hstimer_parents,
+				      0x744,
+				      0, 3,	/* P */
+				      24, 3,	/* mux */
+				      BIT(31),	/* gate */
+				      0);
 
 static SUNXI_CCU_GATE_HWS(bus_hstimer_clk, "bus-hstimer", ahb_hws, 0x74c,
 			  BIT(0), 0);
@@ -584,14 +579,13 @@ static const struct clk_parent_data iommu_parents[] = {
 	{ .fw_name = "hosc" },
 };
 
-static SUNXI_CCU_MP_DATA_WITH_MUX_GATE_FEAT(iommu_clk, "iommu", iommu_parents,
-					    0x7b0,
-					    0, 5,	/* M */
-					    0, 0,	/* no P */
-					    24, 3,	/* mux */
-					    BIT(31),	/* gate */
-					    CLK_SET_RATE_PARENT,
-					    CCU_FEATURE_UPDATE_BIT);
+static SUNXI_CCU_M_DATA_WITH_MUX_GATE_FEAT(iommu_clk, "iommu", iommu_parents,
+					   0x7b0,
+					   0, 5,	/* M */
+					   24, 3,	/* mux */
+					   BIT(31),	/* gate */
+					   CLK_SET_RATE_PARENT,
+					   CCU_FEATURE_UPDATE_BIT);
 
 static SUNXI_CCU_GATE_HWS(bus_iommu_clk, "bus-iommu", apb0_hws, 0x7bc,
 			  BIT(0), 0);
@@ -603,14 +597,14 @@ static const struct clk_parent_data dram_parents[] = {
 	{ .hw = &pll_periph0_400M_clk.hw },
 	{ .hw = &pll_periph0_150M_clk.hw },
 };
-static SUNXI_CCU_MP_DATA_WITH_MUX_GATE_FEAT(dram_clk, "dram", dram_parents,
-					    0x800,
-					    0, 5,	/* M */
-					    0, 0,	/* no P */
-					    24, 3,	/* mux */
-					    BIT(31),	/* gate */
-					    CLK_IS_CRITICAL,
-					    CCU_FEATURE_UPDATE_BIT);
+
+static SUNXI_CCU_M_DATA_WITH_MUX_GATE_FEAT(dram_clk, "dram", dram_parents,
+					   0x800,
+					   0, 5,	/* M */
+					   24, 3,	/* mux */
+					   BIT(31),	/* gate */
+					   CLK_IS_CRITICAL,
+					   CCU_FEATURE_UPDATE_BIT);
 
 static SUNXI_CCU_GATE_HWS(mbus_dma_clk, "mbus-dma", mbus_hws,
 			  0x804, BIT(0), 0);
-- 
2.53.0
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