linux-kernel - [stable 4.19][PATCH 09/17] clk: stm32mp1: add CLK_SET_RATE_NO

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Message-Id: <20191128165002.6234-10-mathieu.poirier@linaro.org>
Date:   Thu, 28 Nov 2019 09:49:54 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [stable 4.19][PATCH 09/17] clk: stm32mp1: add CLK_SET_RATE_NO_REPARENT to Kernel clocks

From: Gabriel Fernandez <gabriel.fernandez@...com>

commit 72cfd1ad1057f16fc614861b3c271597995e57ba upstream

STM32MP1 clock IP offers lots of Kernel clocks that are shared
by multiple IP's at the same time.
Then boot loader applies a clock tree that allows to use all IP's
at same time and with the maximum of performance.
Not change parents on a change rate on kernel clocks ensures
the integrity of the system.

Signed-off-by: Gabriel Fernandez <gabriel.fernandez@...com>
Signed-off-by: Stephen Boyd <sboyd@...nel.org>
Cc: stable <stable@...r.kernel.org> # 4.19
Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
 drivers/clk/clk-stm32mp1.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/clk/clk-stm32mp1.c b/drivers/clk/clk-stm32mp1.c
index 851fb4e9ac44..8e25ed62f67b 100644
--- a/drivers/clk/clk-stm32mp1.c
+++ b/drivers/clk/clk-stm32mp1.c
@@ -1286,10 +1286,11 @@ _clk_stm32_register_composite(struct device *dev,
 	MGATE_MP1(_id, _name, _parent, _flags, _mgate)
 
 #define KCLK(_id, _name, _parents, _flags, _mgate, _mmux)\
-	     COMPOSITE(_id, _name, _parents, CLK_OPS_PARENT_ENABLE | _flags,\
-		  _MGATE_MP1(_mgate),\
-		  _MMUX(_mmux),\
-		  _NO_DIV)
+	     COMPOSITE(_id, _name, _parents, CLK_OPS_PARENT_ENABLE |\
+		       CLK_SET_RATE_NO_REPARENT | _flags,\
+		       _MGATE_MP1(_mgate),\
+		       _MMUX(_mmux),\
+		       _NO_DIV)
 
 enum {
 	G_SAI1,
@@ -1952,7 +1953,8 @@ static const struct clock_config stm32mp1_clock_cfg[] = {
 	MGATE_MP1(GPU_K, "gpu_k", "pll2_q", 0, G_GPU),
 	MGATE_MP1(DAC12_K, "dac12_k", "ck_lsi", 0, G_DAC12),
 
-	COMPOSITE(ETHPTP_K, "ethptp_k", eth_src, CLK_OPS_PARENT_ENABLE,
+	COMPOSITE(ETHPTP_K, "ethptp_k", eth_src, CLK_OPS_PARENT_ENABLE |
+		  CLK_SET_RATE_NO_REPARENT,
 		  _NO_GATE,
 		  _MMUX(M_ETHCK),
 		  _DIV(RCC_ETHCKSELR, 4, 4, CLK_DIVIDER_ALLOW_ZERO, NULL)),
-- 
2.17.1