This is a note to let you know that I've just added the patch titled
clk: samsung: gs101: propagate PERIC0 USI SPI clock rate
to the 6.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
clk-samsung-gs101-propagate-peric0-usi-spi-clock-rat.patch
and it can be found in the queue-6.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5440f05ef5b93e939982e2dbdeb3b83b10439032
Author: Tudor Ambarus <tudor.ambarus@xxxxxxxxxx>
Date: Fri Apr 19 10:09:14 2024 +0000
clk: samsung: gs101: propagate PERIC0 USI SPI clock rate
[ Upstream commit 7b54d9113cd4923432c0b2441c5e2663873b4e5b ]
Introduce nMUX() for MUX clocks that can be reparented on clock rate
change. "nMUX" comes from "n-to-1 selector", hopefully emphasising that
the selector can change on clock rate changes. Ideally MUX/MUX_F()
should change to not have the CLK_SET_RATE_NO_REPARENT flag set by
default, and all their users to be updated to add the flag back
(like in the case of DIV and GATE). But this is a very intrusive change
and because for now only GS101 allows MUX reparenting on clock rate
change, stick with nMUX().
GS101 defines MUX clocks that are dedicated for each instance of the IP.
One example is USI IP (SPI, I2C, serial). The reparenting of these MUX
clocks will not affect other instances of the same IP or different IPs
altogether.
When SPI transfer is being prepared, the spi-s3c64xx driver will call
clk_set_rate() to change the rate of SPI source clock (IPCLK). But IPCLK
is a gate (leaf) clock, so it must propagate the rate change up the
clock tree, so that corresponding MUX/DIV clocks can actually change
their values. Add CLK_SET_RATE_PARENT flag to corresponding clocks for
all USI instances in GS101 PERIC0: USI{1-8, 14}. This change involves the
following clocks:
PERIC0 USI*:
Clock Div range MUX Selection
-------------------------------------------------------------------
gout_peric0_peric0_top0_ipclk_* - -
dout_peric0_usi*_usi /1..16 -
mout_peric0_usi*_usi_user - {24.5 MHz, 400 MHz}
With input clock of 400 MHz this scheme provides the following IPCLK
rate range, for each USI block:
PERIC0 USI*: 1.5 MHz ... 400 MHz
Accounting for internal /4 divider in SPI blocks, and because the max
SPI frequency is limited at 50 MHz, it gives us next SPI SCK rates:
PERIC0 USI_SPI*: 384 KHz ... 49.9 MHz
Fixes: 893f133a040b ("clk: samsung: gs101: add support for cmu_peric0")
Reviewed-by: Peter Griffin <peter.griffin@xxxxxxxxxx>
Acked-by: André Draszik <andre.draszik@xxxxxxxxxx>
Signed-off-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240419100915.2168573-2-tudor.ambarus@xxxxxxxxxx
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/clk/samsung/clk-gs101.c b/drivers/clk/samsung/clk-gs101.c
index d065e343a85dd..76d4d0fa1168a 100644
--- a/drivers/clk/samsung/clk-gs101.c
+++ b/drivers/clk/samsung/clk-gs101.c
@@ -2763,33 +2763,33 @@ static const struct samsung_mux_clock peric0_mux_clks[] __initconst = {
MUX(CLK_MOUT_PERIC0_USI0_UART_USER,
"mout_peric0_usi0_uart_user", mout_peric0_usi0_uart_user_p,
PLL_CON0_MUX_CLKCMU_PERIC0_USI0_UART_USER, 4, 1),
- MUX(CLK_MOUT_PERIC0_USI14_USI_USER,
- "mout_peric0_usi14_usi_user", mout_peric0_usi_usi_user_p,
- PLL_CON0_MUX_CLKCMU_PERIC0_USI14_USI_USER, 4, 1),
- MUX(CLK_MOUT_PERIC0_USI1_USI_USER,
- "mout_peric0_usi1_usi_user", mout_peric0_usi_usi_user_p,
- PLL_CON0_MUX_CLKCMU_PERIC0_USI1_USI_USER, 4, 1),
- MUX(CLK_MOUT_PERIC0_USI2_USI_USER,
- "mout_peric0_usi2_usi_user", mout_peric0_usi_usi_user_p,
- PLL_CON0_MUX_CLKCMU_PERIC0_USI2_USI_USER, 4, 1),
- MUX(CLK_MOUT_PERIC0_USI3_USI_USER,
- "mout_peric0_usi3_usi_user", mout_peric0_usi_usi_user_p,
- PLL_CON0_MUX_CLKCMU_PERIC0_USI3_USI_USER, 4, 1),
- MUX(CLK_MOUT_PERIC0_USI4_USI_USER,
- "mout_peric0_usi4_usi_user", mout_peric0_usi_usi_user_p,
- PLL_CON0_MUX_CLKCMU_PERIC0_USI4_USI_USER, 4, 1),
- MUX(CLK_MOUT_PERIC0_USI5_USI_USER,
- "mout_peric0_usi5_usi_user", mout_peric0_usi_usi_user_p,
- PLL_CON0_MUX_CLKCMU_PERIC0_USI5_USI_USER, 4, 1),
- MUX(CLK_MOUT_PERIC0_USI6_USI_USER,
- "mout_peric0_usi6_usi_user", mout_peric0_usi_usi_user_p,
- PLL_CON0_MUX_CLKCMU_PERIC0_USI6_USI_USER, 4, 1),
- MUX(CLK_MOUT_PERIC0_USI7_USI_USER,
- "mout_peric0_usi7_usi_user", mout_peric0_usi_usi_user_p,
- PLL_CON0_MUX_CLKCMU_PERIC0_USI7_USI_USER, 4, 1),
- MUX(CLK_MOUT_PERIC0_USI8_USI_USER,
- "mout_peric0_usi8_usi_user", mout_peric0_usi_usi_user_p,
- PLL_CON0_MUX_CLKCMU_PERIC0_USI8_USI_USER, 4, 1),
+ nMUX(CLK_MOUT_PERIC0_USI14_USI_USER,
+ "mout_peric0_usi14_usi_user", mout_peric0_usi_usi_user_p,
+ PLL_CON0_MUX_CLKCMU_PERIC0_USI14_USI_USER, 4, 1),
+ nMUX(CLK_MOUT_PERIC0_USI1_USI_USER,
+ "mout_peric0_usi1_usi_user", mout_peric0_usi_usi_user_p,
+ PLL_CON0_MUX_CLKCMU_PERIC0_USI1_USI_USER, 4, 1),
+ nMUX(CLK_MOUT_PERIC0_USI2_USI_USER,
+ "mout_peric0_usi2_usi_user", mout_peric0_usi_usi_user_p,
+ PLL_CON0_MUX_CLKCMU_PERIC0_USI2_USI_USER, 4, 1),
+ nMUX(CLK_MOUT_PERIC0_USI3_USI_USER,
+ "mout_peric0_usi3_usi_user", mout_peric0_usi_usi_user_p,
+ PLL_CON0_MUX_CLKCMU_PERIC0_USI3_USI_USER, 4, 1),
+ nMUX(CLK_MOUT_PERIC0_USI4_USI_USER,
+ "mout_peric0_usi4_usi_user", mout_peric0_usi_usi_user_p,
+ PLL_CON0_MUX_CLKCMU_PERIC0_USI4_USI_USER, 4, 1),
+ nMUX(CLK_MOUT_PERIC0_USI5_USI_USER,
+ "mout_peric0_usi5_usi_user", mout_peric0_usi_usi_user_p,
+ PLL_CON0_MUX_CLKCMU_PERIC0_USI5_USI_USER, 4, 1),
+ nMUX(CLK_MOUT_PERIC0_USI6_USI_USER,
+ "mout_peric0_usi6_usi_user", mout_peric0_usi_usi_user_p,
+ PLL_CON0_MUX_CLKCMU_PERIC0_USI6_USI_USER, 4, 1),
+ nMUX(CLK_MOUT_PERIC0_USI7_USI_USER,
+ "mout_peric0_usi7_usi_user", mout_peric0_usi_usi_user_p,
+ PLL_CON0_MUX_CLKCMU_PERIC0_USI7_USI_USER, 4, 1),
+ nMUX(CLK_MOUT_PERIC0_USI8_USI_USER,
+ "mout_peric0_usi8_usi_user", mout_peric0_usi_usi_user_p,
+ PLL_CON0_MUX_CLKCMU_PERIC0_USI8_USI_USER, 4, 1),
};
static const struct samsung_div_clock peric0_div_clks[] __initconst = {
@@ -2798,33 +2798,42 @@ static const struct samsung_div_clock peric0_div_clks[] __initconst = {
DIV(CLK_DOUT_PERIC0_USI0_UART,
"dout_peric0_usi0_uart", "mout_peric0_usi0_uart_user",
CLK_CON_DIV_DIV_CLK_PERIC0_USI0_UART, 0, 4),
- DIV(CLK_DOUT_PERIC0_USI14_USI,
- "dout_peric0_usi14_usi", "mout_peric0_usi14_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC0_USI14_USI, 0, 4),
- DIV(CLK_DOUT_PERIC0_USI1_USI,
- "dout_peric0_usi1_usi", "mout_peric0_usi1_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC0_USI1_USI, 0, 4),
- DIV(CLK_DOUT_PERIC0_USI2_USI,
- "dout_peric0_usi2_usi", "mout_peric0_usi2_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC0_USI2_USI, 0, 4),
- DIV(CLK_DOUT_PERIC0_USI3_USI,
- "dout_peric0_usi3_usi", "mout_peric0_usi3_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC0_USI3_USI, 0, 4),
- DIV(CLK_DOUT_PERIC0_USI4_USI,
- "dout_peric0_usi4_usi", "mout_peric0_usi4_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC0_USI4_USI, 0, 4),
- DIV(CLK_DOUT_PERIC0_USI5_USI,
- "dout_peric0_usi5_usi", "mout_peric0_usi5_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC0_USI5_USI, 0, 4),
- DIV(CLK_DOUT_PERIC0_USI6_USI,
- "dout_peric0_usi6_usi", "mout_peric0_usi6_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC0_USI6_USI, 0, 4),
- DIV(CLK_DOUT_PERIC0_USI7_USI,
- "dout_peric0_usi7_usi", "mout_peric0_usi7_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC0_USI7_USI, 0, 4),
- DIV(CLK_DOUT_PERIC0_USI8_USI,
- "dout_peric0_usi8_usi", "mout_peric0_usi8_usi_user",
- CLK_CON_DIV_DIV_CLK_PERIC0_USI8_USI, 0, 4),
+ DIV_F(CLK_DOUT_PERIC0_USI14_USI,
+ "dout_peric0_usi14_usi", "mout_peric0_usi14_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC0_USI14_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
+ DIV_F(CLK_DOUT_PERIC0_USI1_USI,
+ "dout_peric0_usi1_usi", "mout_peric0_usi1_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC0_USI1_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
+ DIV_F(CLK_DOUT_PERIC0_USI2_USI,
+ "dout_peric0_usi2_usi", "mout_peric0_usi2_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC0_USI2_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
+ DIV_F(CLK_DOUT_PERIC0_USI3_USI,
+ "dout_peric0_usi3_usi", "mout_peric0_usi3_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC0_USI3_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
+ DIV_F(CLK_DOUT_PERIC0_USI4_USI,
+ "dout_peric0_usi4_usi", "mout_peric0_usi4_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC0_USI4_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
+ DIV_F(CLK_DOUT_PERIC0_USI5_USI,
+ "dout_peric0_usi5_usi", "mout_peric0_usi5_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC0_USI5_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
+ DIV_F(CLK_DOUT_PERIC0_USI6_USI,
+ "dout_peric0_usi6_usi", "mout_peric0_usi6_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC0_USI6_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
+ DIV_F(CLK_DOUT_PERIC0_USI7_USI,
+ "dout_peric0_usi7_usi", "mout_peric0_usi7_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC0_USI7_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
+ DIV_F(CLK_DOUT_PERIC0_USI8_USI,
+ "dout_peric0_usi8_usi", "mout_peric0_usi8_usi_user",
+ CLK_CON_DIV_DIV_CLK_PERIC0_USI8_USI, 0, 4,
+ CLK_SET_RATE_PARENT, 0),
};
static const struct samsung_gate_clock peric0_gate_clks[] __initconst = {
@@ -2857,11 +2866,11 @@ static const struct samsung_gate_clock peric0_gate_clks[] __initconst = {
GATE(CLK_GOUT_PERIC0_PERIC0_TOP0_IPCLK_0,
"gout_peric0_peric0_top0_ipclk_0", "dout_peric0_usi1_usi",
CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP0_IPCLKPORT_IPCLK_0,
- 21, 0, 0),
+ 21, CLK_SET_RATE_PARENT, 0),
GATE(CLK_GOUT_PERIC0_PERIC0_TOP0_IPCLK_1,
"gout_peric0_peric0_top0_ipclk_1", "dout_peric0_usi2_usi",
CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP0_IPCLKPORT_IPCLK_1,
- 21, 0, 0),
+ 21, CLK_SET_RATE_PARENT, 0),
GATE(CLK_GOUT_PERIC0_PERIC0_TOP0_IPCLK_10,
"gout_peric0_peric0_top0_ipclk_10", "dout_peric0_i3c",
CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP0_IPCLKPORT_IPCLK_10,
@@ -2889,27 +2898,27 @@ static const struct samsung_gate_clock peric0_gate_clks[] __initconst = {
GATE(CLK_GOUT_PERIC0_PERIC0_TOP0_IPCLK_2,
"gout_peric0_peric0_top0_ipclk_2", "dout_peric0_usi3_usi",
CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP0_IPCLKPORT_IPCLK_2,
- 21, 0, 0),
+ 21, CLK_SET_RATE_PARENT, 0),
GATE(CLK_GOUT_PERIC0_PERIC0_TOP0_IPCLK_3,
"gout_peric0_peric0_top0_ipclk_3", "dout_peric0_usi4_usi",
CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP0_IPCLKPORT_IPCLK_3,
- 21, 0, 0),
+ 21, CLK_SET_RATE_PARENT, 0),
GATE(CLK_GOUT_PERIC0_PERIC0_TOP0_IPCLK_4,
"gout_peric0_peric0_top0_ipclk_4", "dout_peric0_usi5_usi",
CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP0_IPCLKPORT_IPCLK_4,
- 21, 0, 0),
+ 21, CLK_SET_RATE_PARENT, 0),
GATE(CLK_GOUT_PERIC0_PERIC0_TOP0_IPCLK_5,
"gout_peric0_peric0_top0_ipclk_5", "dout_peric0_usi6_usi",
CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP0_IPCLKPORT_IPCLK_5,
- 21, 0, 0),
+ 21, CLK_SET_RATE_PARENT, 0),
GATE(CLK_GOUT_PERIC0_PERIC0_TOP0_IPCLK_6,
"gout_peric0_peric0_top0_ipclk_6", "dout_peric0_usi7_usi",
CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP0_IPCLKPORT_IPCLK_6,
- 21, 0, 0),
+ 21, CLK_SET_RATE_PARENT, 0),
GATE(CLK_GOUT_PERIC0_PERIC0_TOP0_IPCLK_7,
"gout_peric0_peric0_top0_ipclk_7", "dout_peric0_usi8_usi",
CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP0_IPCLKPORT_IPCLK_7,
- 21, 0, 0),
+ 21, CLK_SET_RATE_PARENT, 0),
GATE(CLK_GOUT_PERIC0_PERIC0_TOP0_IPCLK_8,
"gout_peric0_peric0_top0_ipclk_8", "dout_peric0_i3c",
CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP0_IPCLKPORT_IPCLK_8,
@@ -2990,7 +2999,7 @@ static const struct samsung_gate_clock peric0_gate_clks[] __initconst = {
GATE(CLK_GOUT_PERIC0_PERIC0_TOP1_IPCLK_2,
"gout_peric0_peric0_top1_ipclk_2", "dout_peric0_usi14_usi",
CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP1_IPCLKPORT_IPCLK_2,
- 21, 0, 0),
+ 21, CLK_SET_RATE_PARENT, 0),
/* Disabling this clock makes the system hang. Mark the clock as critical. */
GATE(CLK_GOUT_PERIC0_PERIC0_TOP1_PCLK_0,
"gout_peric0_peric0_top1_pclk_0", "mout_peric0_bus_user",
diff --git a/drivers/clk/samsung/clk.h b/drivers/clk/samsung/clk.h
index a763309e6f129..556167350bff5 100644
--- a/drivers/clk/samsung/clk.h
+++ b/drivers/clk/samsung/clk.h
@@ -133,7 +133,7 @@ struct samsung_mux_clock {
.name = cname, \
.parent_names = pnames, \
.num_parents = ARRAY_SIZE(pnames), \
- .flags = (f) | CLK_SET_RATE_NO_REPARENT, \
+ .flags = f, \
.offset = o, \
.shift = s, \
.width = w, \
@@ -141,9 +141,16 @@ struct samsung_mux_clock {
}
#define MUX(_id, cname, pnames, o, s, w) \
- __MUX(_id, cname, pnames, o, s, w, 0, 0)
+ __MUX(_id, cname, pnames, o, s, w, CLK_SET_RATE_NO_REPARENT, 0)
#define MUX_F(_id, cname, pnames, o, s, w, f, mf) \
+ __MUX(_id, cname, pnames, o, s, w, (f) | CLK_SET_RATE_NO_REPARENT, mf)
+
+/* Used by MUX clocks where reparenting on clock rate change is allowed. */
+#define nMUX(_id, cname, pnames, o, s, w) \
+ __MUX(_id, cname, pnames, o, s, w, 0, 0)
+
+#define nMUX_F(_id, cname, pnames, o, s, w, f, mf) \
__MUX(_id, cname, pnames, o, s, w, f, mf)
/**
