linux-kernel - [PATCH] ARM: lpc32xx: stop overwriting TEST_CLK

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Date:   Thu, 11 Apr 2019 16:12:09 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Vladimir Zapolskiy <vz@...ia.com>,
        Sylvain Lemieux <slemieux.tyco@...il.com>
Cc:     Gregory Clement <gregory.clement@...tlin.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Subject: [PATCH] ARM: lpc32xx: stop overwriting TEST_CLK_SEL

While the UDA1380 is described in some lpc3250 device trees, there is
currently no real user of that codec. Anyway, if the codec needs a clock,
it should take it explicitly.

lpc3250_machine_init is called for all the lpc32xx machines and some are
using test1_clk (for example to strobe an HW watchdog). Overwriting
TEST_CLK_SEL prevents booting those platforms.

Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
---
 arch/arm/mach-lpc32xx/phy3250.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/arch/arm/mach-lpc32xx/phy3250.c b/arch/arm/mach-lpc32xx/phy3250.c
index fdbb1409c32b..1db8508493a5 100644
--- a/arch/arm/mach-lpc32xx/phy3250.c
+++ b/arch/arm/mach-lpc32xx/phy3250.c
@@ -128,11 +128,6 @@ static void __init lpc3250_machine_init(void)
 {
 	lpc32xx_serial_init();
 
-	/* Test clock needed for UDA1380 initial init */
-	__raw_writel(LPC32XX_CLKPWR_TESTCLK2_SEL_MOSC |
-		LPC32XX_CLKPWR_TESTCLK_TESTCLK2_EN,
-		LPC32XX_CLKPWR_TEST_CLK_SEL);
-
 	of_platform_default_populate(NULL, lpc32xx_auxdata_lookup, NULL);
 }
 
-- 
2.20.1