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clk: baikal-t1: Add shared xGMAC ref/ptp clocks internal parent

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[ Upstream commit e2eef312762e0b5a5a70d29fe59a245c0a3cffa0 ]

Baikal-T1 CCU reference manual says that both xGMAC reference and xGMAC
PTP clocks are generated by two different wrappers with the same constant
divider thus each producing a 156.25 MHz signal. But for some reason both
of these clock sources are gated by a single switch-flag in the CCU
registers space - CCU_SYS_XGMAC_BASE.BIT(0). In order to make the clocks
handled independently we need to define a shared parental gate so the base
clock signal would be switched off only if both of the child-clocks are
disabled.

Note the ID is intentionally set to -2 since we are going to add a one
more internal clock identifier in the next commit.

Fixes: 353afa3a8d2e ("clk: Add Baikal-T1 CCU Dividers driver")
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Link: https://lore.kernel.org/r/20220929225402.9696-4-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Serge Semin 2022-09-30 01:53:57 +03:00 committed by Greg Kroah-Hartman
parent b2db8b2c53
commit 35b7660275
3 changed files with 12 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/clk/baikal-t1/ccu-div.c
View File

@ -579,6 +579,7 @@ struct ccu_div *ccu_div_hw_register(const struct ccu_div_init_data *div_init)
goto err_free_div;
}
parent_data.fw_name = div_init->parent_name;
parent_data.name = div_init->parent_name;
hw_init.parent_data = &parent_data;
hw_init.num_parents = 1;

6
drivers/clk/baikal-t1/ccu-div.h
View File

@ -13,6 +13,12 @@
#include <linux/bits.h>
#include <linux/of.h>
/*
* CCU Divider private clock IDs
* @CCU_SYS_XGMAC_CLK: CCU XGMAC internal clock
*/
#define CCU_SYS_XGMAC_CLK -2
/*
* CCU Divider private flags
* @CCU_DIV_SKIP_ONE: Due to some reason divider can't be set to 1.

8
drivers/clk/baikal-t1/clk-ccu-div.c
View File

@ -204,10 +204,12 @@ static const struct ccu_div_info sys_info[] = {
"eth_clk", CCU_SYS_GMAC1_BASE, 5),
CCU_DIV_FIXED_INFO(CCU_SYS_GMAC1_PTP_CLK, "sys_gmac1_ptp_clk",
"eth_clk", 10),
CCU_DIV_GATE_INFO(CCU_SYS_XGMAC_REF_CLK, "sys_xgmac_ref_clk",
"eth_clk", CCU_SYS_XGMAC_BASE, 8),
CCU_DIV_GATE_INFO(CCU_SYS_XGMAC_CLK, "sys_xgmac_clk",
"eth_clk", CCU_SYS_XGMAC_BASE, 1),
CCU_DIV_FIXED_INFO(CCU_SYS_XGMAC_REF_CLK, "sys_xgmac_ref_clk",
"sys_xgmac_clk", 8),
CCU_DIV_FIXED_INFO(CCU_SYS_XGMAC_PTP_CLK, "sys_xgmac_ptp_clk",
"eth_clk", 8),
"sys_xgmac_clk", 8),
CCU_DIV_GATE_INFO(CCU_SYS_USB_CLK, "sys_usb_clk",
"eth_clk", CCU_SYS_USB_BASE, 10),
CCU_DIV_VAR_INFO(CCU_SYS_PVT_CLK, "sys_pvt_clk",