linux-kernel - Re: [PATCH v7 1/4] ARM: EXYNOS: Add support for mapping PMU base address via DT

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Message-ID: <53D472FF.60009@suse.de>
Date:	Sun, 27 Jul 2014 05:33:19 +0200
From:	Andreas Färber <afaerber@...e.de>
To:	Kukjin Kim <kgene.kim@...sung.com>,
	'Pankaj Dubey' <pankaj.dubey@...sung.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
CC:	linux@....linux.org.uk, t.figa@...sung.com,
	vikas.sajjan@...sung.com, joshi@...sung.com, naushad@...sung.com,
	thomas.ab@...sung.com, chow.kim@...sung.com
Subject: Re: [PATCH v7 1/4] ARM: EXYNOS: Add support for mapping PMU base
 address via DT

Am 10.07.2014 15:49, schrieb Kukjin Kim:
> Pankaj Dubey wrote:
>>
>> Add support for mapping Samsung Power Management Unit (PMU)
>> base address from device tree.
>>
>> Signed-off-by: Pankaj Dubey <pankaj.dubey@...sung.com>
>> Reviewed-by: Tomasz Figa <t.figa@...sung.com>
>> ---
>>  arch/arm/mach-exynos/common.h |    1 +
>>  arch/arm/mach-exynos/exynos.c |   37 +++++++++++++++++++++++++++++++++++++
>>  2 files changed, 38 insertions(+)
>>
>> diff --git a/arch/arm/mach-exynos/common.h b/arch/arm/mach-exynos/common.h
>> index 152b464..f8daa9c 100644
>> --- a/arch/arm/mach-exynos/common.h
>> +++ b/arch/arm/mach-exynos/common.h
>> @@ -113,6 +113,7 @@ IS_SAMSUNG_CPU(exynos5800, EXYNOS5800_SOC_ID, EXYNOS5_SOC_MASK)
>>
>>  extern void __iomem *sysram_ns_base_addr;
>>  extern void __iomem *sysram_base_addr;
>> +extern void __iomem *pmu_base_addr;
>>  void exynos_sysram_init(void);
>>
>>  void exynos_firmware_init(void);
>> diff --git a/arch/arm/mach-exynos/exynos.c b/arch/arm/mach-exynos/exynos.c
>> index 186f35d..173aac8 100644
>> --- a/arch/arm/mach-exynos/exynos.c
>> +++ b/arch/arm/mach-exynos/exynos.c
>> @@ -19,6 +19,7 @@
>>  #include <linux/of_platform.h>
>>  #include <linux/platform_device.h>
>>  #include <linux/pm_domain.h>
>> +#include <linux/irqchip.h>
>>
>>  #include <asm/cacheflush.h>
>>  #include <asm/hardware/cache-l2x0.h>
>> @@ -31,6 +32,8 @@
>>  #include "regs-pmu.h"
>>  #include "regs-sys.h"
>>
>> +void __iomem *pmu_base_addr;
>> +
>>  static struct map_desc exynos4_iodesc[] __initdata = {
>>  	{
>>  		.virtual	= (unsigned long)S3C_VA_SYS,
>> @@ -253,6 +256,39 @@ static void __init exynos_init_io(void)
>>  	exynos_map_io();
>>  }
>>
>> +static const struct of_device_id exynos_dt_pmu_match[] = {
>> +	{ .compatible = "samsung,exynos3250-pmu" },
>> +	{ .compatible = "samsung,exynos4210-pmu" },
>> +	{ .compatible = "samsung,exynos4212-pmu" },
>> +	{ .compatible = "samsung,exynos4412-pmu" },
>> +	{ .compatible = "samsung,exynos5250-pmu" },
>> +	{ .compatible = "samsung,exynos5420-pmu" },
>> +	{ /*sentinel*/ },
>> +};
>> +
>> +static void exynos_map_pmu(void)
>> +{
>> +	struct device_node *np;
>> +
>> +	np = of_find_matching_node(NULL, exynos_dt_pmu_match);
>> +	if (np)
>> +		pmu_base_addr = of_iomap(np, 0);
>> +
>> +	if (!pmu_base_addr)
>> +		panic("failed to find exynos pmu register\n");
>> +}
>> +
>> +static void __init exynos_init_irq(void)
>> +{
>> +	irqchip_init();
>> +	/*
>> +	 * Since platsmp.c needs pmu base address by the time
>> +	 * DT is not unflatten so we can't use DT APIs before

Either "Since platsmp.c needs ... unflattened, we can't ..."
or "platsmp.c needs ... unflattened, so we can't ..."

>> +	 * init_irq
>> +	 */
>> +	exynos_map_pmu();
>> +}
>> +
>>  static void __init exynos_dt_machine_init(void)
>>  {
>>  	struct device_node *i2c_np;
>> @@ -336,6 +372,7 @@ DT_MACHINE_START(EXYNOS_DT, "SAMSUNG EXYNOS (Flattened Device Tree)")
>>  	.smp		= smp_ops(exynos_smp_ops),
>>  	.map_io		= exynos_init_io,
>>  	.init_early	= exynos_firmware_init,
>> +	.init_irq	= exynos_init_irq,
>>  	.init_machine	= exynos_dt_machine_init,
>>  	.init_late	= exynos_init_late,
>>  	.dt_compat	= exynos_dt_compat,
>> --
>> 1.7.9.5
> 
> Looks good to me, will apply.

Unfortunately this broke the boot on ODROID-XU: Neither is there a
exynos_dt_pmu_match[] entry for 5410 nor is such a node defined in
exynos5410.dtsi. Not having access to a TRM, should 5410 get a node like
5420? Might SoCs beyond 5420 also require changes?

Regards,
Andreas

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