[PATCH v5 02/14] clk: microchip: mpfs: make the rtc's ahb clock critical

Conor Dooley
2022-09-09T12:31:58Z

The onboard RTC's AHB bus clock must be kept running as the RTC will
stop & lose track of time if the AHB interface clock is disabled.

Fixes: 635e5e73370e ("clk: microchip: Add driver for Microchip PolarFire SoC")
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
---
drivers/clk/microchip/clk-mpfs.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/microchip/clk-mpfs.c b/drivers/clk/microchip/clk-mpfs.c
index f0f9c9a1cc48..b6b89413e090 100644
--- a/drivers/clk/microchip/clk-mpfs.c
+++ b/drivers/clk/microchip/clk-mpfs.c
@@ -375,6 +375,8 @@ static const struct clk_ops mpfs_periph_clk_ops = {
* trap handler
* - CLK_MMUART0: reserved by the hss
* - CLK_DDRC: provides clock to the ddr subsystem
+ * - CLK_RTC: the onboard RTC's AHB bus clock must be kept running as the rtc will stop
+ * if the AHB interface clock is disabled
* - CLK_FICx: these provide the processor side clocks to the "FIC" (Fabric InterConnect)
* clock domain crossers which provide the interface to the FPGA fabric. Disabling them
* causes the FPGA fabric to go into reset.
@@ -399,7 +401,7 @@ static struct mpfs_periph_hw_clock mpfs_periph_clks[] = {
CLK_PERIPH(CLK_CAN0, "clk_periph_can0", PARENT_CLK(AHB), 14, 0),
CLK_PERIPH(CLK_CAN1, "clk_periph_can1", PARENT_CLK(AHB), 15, 0),
CLK_PERIPH(CLK_USB, "clk_periph_usb", PARENT_CLK(AHB), 16, 0),
- CLK_PERIPH(CLK_RTC, "clk_periph_rtc", PARENT_CLK(AHB), 18, 0),
+ CLK_PERIPH(CLK_RTC, "clk_periph_rtc", PARENT_CLK(AHB), 18, CLK_IS_CRITICAL),
CLK_PERIPH(CLK_QSPI, "clk_periph_qspi", PARENT_CLK(AHB), 19, 0),
CLK_PERIPH(CLK_GPIO0, "clk_periph_gpio0", PARENT_CLK(AHB), 20, 0),
CLK_PERIPH(CLK_GPIO1, "clk_periph_gpio1", PARENT_CLK(AHB), 21, 0),
--
2.36.1