[PATCH 1/7] clk: stm32mp1: Split ETHCK_K into separate MUX and GATE clock

[Marek Vasut]

The ETHCK_K are modeled as composite clock of MUX and GATE, however per
STM32MP1 Reference Manual RM0436 Rev 3, Page 574, Figure 83. Peripheral
clock distribution for Ethernet, ETHPTPDIV divider is attached past the
ETHCK_K mux, and ETH_CLK/eth_clk_fb clock are output past ETHCKEN gate.
Therefore, in case ETH_CLK/eth_clk_fb are not in use AND PTP clock are
in use, ETHCKEN gate can be turned off. Current driver does not permit
that, fix it.

This patch converts ETHCK_K from composite clock into a ETHCKEN gate,
ETHPTP_K from composite clock into ETHPTPDIV divider, and adds another
NO_ID clock "ck_ker_eth" which models the ETHSRC mux and is parent clock
to both ETHCK_K and ETHPTP_K. Therefore, all references to ETHCK_K and
ETHPTP_K remain functional as before.

[1] STM32MP1 Reference Manual RM0436 Rev 3, Page 574,
    Figure 83. Peripheral clock distribution for Ethernet
    https://www.st.com/resource/en/reference_manual/dm00327659-stm32mp157-advanced-armbased-32bit-mpus-stmicroelectronics.pdf

Signed-off-by: Marek Vasut <marex at denx.de>
Cc: Alexandre Torgue <alexandre.torgue at foss.st.com>
Cc: Christophe Roullier <christophe.roullier at foss.st.com>
Cc: Gabriel Fernandez <gabriel.fernandez at foss.st.com>
Cc: Patrice Chotard <patrice.chotard at foss.st.com>
Cc: Patrick Delaunay <patrick.delaunay at foss.st.com>
Cc: Stephen Boyd <swboyd at chromium.org>
Cc: linux-clk at vger.kernel.org
Cc: linux-stm32 at st-md-mailman.stormreply.com
To: linux-arm-kernel at lists.infradead.org
---
 drivers/clk/clk-stm32mp1.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/clk-stm32mp1.c b/drivers/clk/clk-stm32mp1.c
index a875649df8b8..a7c7f544ee5d 100644
--- a/drivers/clk/clk-stm32mp1.c
+++ b/drivers/clk/clk-stm32mp1.c
@@ -1949,7 +1949,6 @@ static const struct clock_config stm32mp1_clock_cfg[] = {
 	KCLK(DSI_K, "dsi_k", dsi_src, 0, G_DSI, M_DSI),
 	KCLK(ADFSDM_K, "adfsdm_k", sai_src, 0, G_ADFSDM, M_SAI1),
 	KCLK(USBO_K, "usbo_k", usbo_src, 0, G_USBO, M_USBO),
-	KCLK(ETHCK_K, "ethck_k", eth_src, 0, G_ETHCK, M_ETHCK),
 
 	/* Particulary Kernel Clocks (no mux or no gate) */
 	MGATE_MP1(DFSDM_K, "dfsdm_k", "ck_mcu", 0, G_DFSDM),
@@ -1958,11 +1957,16 @@ 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(NO_ID, "ck_ker_eth", eth_src, CLK_OPS_PARENT_ENABLE |
 		  CLK_SET_RATE_NO_REPARENT,
 		  _NO_GATE,
 		  _MMUX(M_ETHCK),
-		  _DIV(RCC_ETHCKSELR, 4, 4, 0, NULL)),
+		  _NO_DIV),
+
+	MGATE_MP1(ETHCK_K, "ethck_k", "ck_ker_eth", 0, G_ETHCK),
+
+	DIV(ETHPTP_K, "ethptp_k", "ck_ker_eth", CLK_OPS_PARENT_ENABLE |
+	    CLK_SET_RATE_NO_REPARENT, RCC_ETHCKSELR, 4, 4, 0),
 
 	/* RTC clock */
 	DIV(NO_ID, "ck_hse_rtc", "ck_hse", 0, RCC_RTCDIVR, 0, 6, 0),
-- 
2.30.2