linux-kernel - [PATCH 5.13 089/127] clk: imx6q: fix uart earlycon unwork

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Date:   Tue, 24 Aug 2021 12:55:29 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Dong Aisheng <aisheng.dong@....com>, Abel Vesa <abel.vesa@....com>,
        Stephen Boyd <sboyd@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.13 089/127] clk: imx6q: fix uart earlycon unwork

From: Dong Aisheng <aisheng.dong@....com>

[ Upstream commit 283f1b9a0401859c53fdd6483ab66f1c4fadaea5 ]

The earlycon depends on the bootloader setup UART clocks being retained.
There're actually two uart clocks (ipg, per) on MX6QDL,
but the 'Fixes' commit change to register only one which means
another clock may be disabled during booting phase
and result in the earlycon unwork.

Cc: stable@...r.kernel.org # v5.10+
Fixes: 379c9a24cc23 ("clk: imx: Fix reparenting of UARTs not associated with stdout")
Signed-off-by: Dong Aisheng <aisheng.dong@....com>
Link: https://lore.kernel.org/r/20210702085438.1988087-1-aisheng.dong@nxp.com
Reviewed-by: Abel Vesa <abel.vesa@....com>
Signed-off-by: Stephen Boyd <sboyd@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/clk/imx/clk-imx6q.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/imx/clk-imx6q.c b/drivers/clk/imx/clk-imx6q.c
index 496900de0b0b..de36f58d551c 100644
--- a/drivers/clk/imx/clk-imx6q.c
+++ b/drivers/clk/imx/clk-imx6q.c
@@ -974,6 +974,6 @@ static void __init imx6q_clocks_init(struct device_node *ccm_node)
 			       hws[IMX6QDL_CLK_PLL3_USB_OTG]->clk);
 	}
 
-	imx_register_uart_clocks(1);
+	imx_register_uart_clocks(2);
 }
 CLK_OF_DECLARE(imx6q, "fsl,imx6q-ccm", imx6q_clocks_init);
-- 
2.30.2