linux-kernel - [PATCH v2 2/2] clk: imx: imx6ul: Fix csi clk gate register

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Date:   Mon, 27 Sep 2021 09:28:57 +0200
From:   Stefan Riedmueller <s.riedmueller@...tec.de>
To:     Abel Vesa <abel.vesa@....com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>
Cc:     Stefan Riedmueller <s.riedmueller@...tec.de>,
        Fabio Estevam <festevam@...il.com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        NXP Linux Team <linux-imx@....com>,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/2] clk: imx: imx6ul: Fix csi clk gate register

According to the imx6ul Reference Manual the csi clk gate register is
CCM_CCGR3 (offset 0x74) bit 0/1. For the imx6ull on the other hand the
Reference Manual lists register CCM_CCGR2 (offset 0x70) bit 2/3 as the
csi clk gate which is the current setting.

Tests have shown though that the correct csi clk gate register for the
imx6ull is actually CCM_CCGR3 bit 0/1 as well. Thus set the correct
register for both platforms.

Signed-off-by: Stefan Riedmueller <s.riedmueller@...tec.de>
Tested-by: Fabio Estevam <festevam@...il.com>
---
Changes in v2:
 - Added comment about ref manual mismatch
 - Added Tested-by from Fabio
---
 drivers/clk/imx/clk-imx6ul.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/imx/clk-imx6ul.c b/drivers/clk/imx/clk-imx6ul.c
index 206e4c43f68f..520b100bff4b 100644
--- a/drivers/clk/imx/clk-imx6ul.c
+++ b/drivers/clk/imx/clk-imx6ul.c
@@ -380,7 +380,6 @@ static void __init imx6ul_clocks_init(struct device_node *ccm_node)
 		hws[IMX6ULL_CLK_ESAI_IPG]	= imx_clk_hw_gate2_shared("esai_ipg",	"ahb",		base + 0x70,	0, &share_count_esai);
 		hws[IMX6ULL_CLK_ESAI_MEM]	= imx_clk_hw_gate2_shared("esai_mem",	"ahb",		base + 0x70,	0, &share_count_esai);
 	}
-	hws[IMX6UL_CLK_CSI]		= imx_clk_hw_gate2("csi",		"csi_podf",		base + 0x70,	2);
 	hws[IMX6UL_CLK_I2C1]		= imx_clk_hw_gate2("i2c1",		"perclk",	base + 0x70,	6);
 	hws[IMX6UL_CLK_I2C2]		= imx_clk_hw_gate2("i2c2",		"perclk",	base + 0x70,	8);
 	hws[IMX6UL_CLK_I2C3]		= imx_clk_hw_gate2("i2c3",		"perclk",	base + 0x70,	10);
@@ -391,6 +390,12 @@ static void __init imx6ul_clocks_init(struct device_node *ccm_node)
 	hws[IMX6UL_CLK_PXP]		= imx_clk_hw_gate2("pxp",		"axi",		base + 0x70,	30);
 
 	/* CCGR3 */
+	/*
+	 * Although the imx6ull reference manual lists CCGR2 as the csi clk
+	 * gate register, tests have shown that it is actually the CCGR3
+	 * register bit 0/1, same as for the imx6ul.
+	 */
+	hws[IMX6UL_CLK_CSI]		= imx_clk_hw_gate2("csi",	"csi_podf",	base + 0x74,	0);
 	hws[IMX6UL_CLK_UART5_IPG]	= imx_clk_hw_gate2("uart5_ipg",	"ipg",		base + 0x74,	2);
 	hws[IMX6UL_CLK_UART5_SERIAL]	= imx_clk_hw_gate2("uart5_serial",	"uart_podf",	base + 0x74,	2);
 	if (clk_on_imx6ul()) {
-- 
2.25.1