linux-kernel - [PATCH 2/2] ARM: EXYNOS: Add apb

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Message-Id: <1323168355-2764-3-git-send-email-tushar.behera@linaro.org>
Date:	Tue,  6 Dec 2011 16:15:55 +0530
From:	Tushar Behera <tushar.behera@...aro.org>
To:	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	kgene.kim@...sung.com, vinod.koul@...el.com,
	linaro-dev@...ts.linaro.org, patches@...aro.org
Subject: [PATCH 2/2] ARM: EXYNOS: Add apb_pclk clkdev entry for mdma1

Amba core assumes the pclk to be named as apb_pclk. During device probe,
it tries to get that clock and enable that. When PM_RUNTIME is enabled,
dma clock is not explicitly enabled in pl330_probe, which causes device
probe to fail. Adding a clkdev entry for apb_pclk for mdma1 fixes the
problem.

This patch fixes following runtime error.

dma-pl330 dma-pl330.2: PERIPH_ID 0x0, PCELL_ID 0x0 !
dma-pl330: probe of dma-pl330.2 failed with error -22

Signed-off-by: Tushar Behera <tushar.behera@...aro.org>
---
 arch/arm/mach-exynos/clock.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-exynos/clock.c b/arch/arm/mach-exynos/clock.c
index 28e2842..eb33a7a 100644
--- a/arch/arm/mach-exynos/clock.c
+++ b/arch/arm/mach-exynos/clock.c
@@ -1326,6 +1326,7 @@ static struct clk_lookup exynos4_clk_lookup[] = {
 	CLKDEV_INIT("s3c-sdhci.3", "mmc_busclk.2", &clk_sclk_mmc3.clk),
 	CLKDEV_INIT("dma-pl330.0", "apb_pclk", &clk_pdma0),
 	CLKDEV_INIT("dma-pl330.1", "apb_pclk", &clk_pdma1),
+	CLKDEV_INIT("dma-pl330.2", "apb_pclk", &clk_mdma1),
 };
 
 static int xtal_rate;
-- 
1.7.4.1

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