linux-kernel - [PATCH] clk: imx8mn: Keep uart clocks on for early console

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Date:   Wed, 24 Jul 2019 15:50:17 +0800
From:   Anson.Huang@....com
To:     mturquette@...libre.com, sboyd@...nel.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     Linux-imx@....com
Subject: [PATCH] clk: imx8mn: Keep uart clocks on for early console

From: Anson Huang <Anson.Huang@....com>

Call imx_register_uart_clocks() API to keep uart clocks enabled
when earlyprintk or earlycon is active.

Signed-off-by: Anson Huang <Anson.Huang@....com>
---
 drivers/clk/imx/clk-imx8mn.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/clk/imx/clk-imx8mn.c b/drivers/clk/imx/clk-imx8mn.c
index 07481a5..ecd1062 100644
--- a/drivers/clk/imx/clk-imx8mn.c
+++ b/drivers/clk/imx/clk-imx8mn.c
@@ -355,6 +355,14 @@ static const char * const imx8mn_clko2_sels[] = {"osc_24m", "sys_pll2_200m", "sy
 static struct clk *clks[IMX8MN_CLK_END];
 static struct clk_onecell_data clk_data;
 
+static struct clk ** const uart_clks[] = {
+	&clks[IMX8MN_CLK_UART1_ROOT],
+	&clks[IMX8MN_CLK_UART2_ROOT],
+	&clks[IMX8MN_CLK_UART3_ROOT],
+	&clks[IMX8MN_CLK_UART4_ROOT],
+	NULL
+};
+
 static int imx8mn_clocks_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -612,6 +620,8 @@ static int imx8mn_clocks_probe(struct platform_device *pdev)
 		goto unregister_clks;
 	}
 
+	imx_register_uart_clocks(uart_clks);
+
 	return 0;
 
 unregister_clks:
-- 
2.7.4