[PATCH v4 4/8] clk: baikal-t1: Add shared xGMAC ref/ptp clocks internal parent

Serge Semin
2022-06-10T07:30:19Z

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>

---

Changelog v4:
- Change the ID macro name to the more descriptive CCU_SYS_XGMAC_CLK.
---
drivers/clk/baikal-t1/ccu-div.c | 1 +
drivers/clk/baikal-t1/ccu-div.h | 6 ++++++
drivers/clk/baikal-t1/clk-ccu-div.c | 8 +++++---
3 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/baikal-t1/ccu-div.c b/drivers/clk/baikal-t1/ccu-div.c
index 4062092d67f9..bbfa3526ee10 100644
--- a/drivers/clk/baikal-t1/ccu-div.c
+++ b/drivers/clk/baikal-t1/ccu-div.c
@@ -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;

diff --git a/drivers/clk/baikal-t1/ccu-div.h b/drivers/clk/baikal-t1/ccu-div.h
index 795665caefbd..b6a9c8e45318 100644
--- a/drivers/clk/baikal-t1/ccu-div.h
+++ b/drivers/clk/baikal-t1/ccu-div.h
@@ -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.
diff --git a/drivers/clk/baikal-t1/clk-ccu-div.c b/drivers/clk/baikal-t1/clk-ccu-div.c
index ea77eec40ddd..3953ae5664be 100644
--- a/drivers/clk/baikal-t1/clk-ccu-div.c
+++ b/drivers/clk/baikal-t1/clk-ccu-div.c
@@ -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",
--
2.35.1