linux-kernel - Re: [PATCH V6 22/30] thermal: exynos: Add support to access common register for multistance

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Date:	Wed, 19 Jun 2013 19:53:29 -0400
From:	Eduardo Valentin <eduardo.valentin@...com>
To:	Amit Daniel Kachhap <amit.daniel@...sung.com>
CC:	<linux-pm@...r.kernel.org>, Zhang Rui <rui.zhang@...el.com>,
	Eduardo Valentin <eduardo.valentin@...com>,
	<linux-samsung-soc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <amit.kachhap@...il.com>,
	Kukjin Kim <kgene.kim@...sung.com>, <jonghwa3.lee@...sung.com>
Subject: Re: [PATCH V6 22/30] thermal: exynos: Add support to access common
 register for multistance

On 17-06-2013 02:46, Amit Daniel Kachhap wrote:
> This patch adds support to parse one more common set of TMU register. First
> set of register belongs to each instance of TMU and second set belongs to
> common TMU registers.
> 
> Acked-by: Jonghwa Lee <jonghwa3.lee@...sung.com>
> Acked-by: Kukjin Kim <kgene.kim@...sung.com>
> Signed-off-by: Amit Daniel Kachhap <amit.daniel@...sung.com>

This patch is fine:

Acked-by: Eduardo Valentin <eduardo.valentin@...com>

But please read my concern on next patch.

> ---
>  .../devicetree/bindings/thermal/exynos-thermal.txt |    6 +++++-
>  drivers/thermal/samsung/exynos_tmu.c               |   20 ++++++++++++++++++++
>  2 files changed, 25 insertions(+), 1 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/thermal/exynos-thermal.txt b/Documentation/devicetree/bindings/thermal/exynos-thermal.txt
> index 535fd0e..0ea33f7 100644
> --- a/Documentation/devicetree/bindings/thermal/exynos-thermal.txt
> +++ b/Documentation/devicetree/bindings/thermal/exynos-thermal.txt
> @@ -7,7 +7,11 @@
>  	       "samsung,exynos4210-tmu"
>  	       "samsung,exynos5250-tmu"
>  - interrupt-parent : The phandle for the interrupt controller
> -- reg : Address range of the thermal registers
> +- reg : Address range of the thermal registers. For soc's which has multiple
> +	instances of TMU and some registers are shared across all TMU's like
> +	interrupt related then 2 set of register has to supplied. First set
> +	belongs	to each instance of TMU and second set belongs to common TMU
> +	registers.
>  - interrupts : Should contain interrupt for thermal system
>  - clocks : The main clock for TMU device
>  - clock-names : Thermal system clock name
> diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
> index 877dab8..150a869 100644
> --- a/drivers/thermal/samsung/exynos_tmu.c
> +++ b/drivers/thermal/samsung/exynos_tmu.c
> @@ -40,6 +40,7 @@
>   * @id: identifier of the one instance of the TMU controller.
>   * @pdata: pointer to the tmu platform/configuration data
>   * @base: base address of the single instance of the TMU controller.
> + * @base_common: base address of the common registers of the TMU controller.
>   * @irq: irq number of the TMU controller.
>   * @soc: id of the SOC type.
>   * @irq_work: pointer to the irq work structure.
> @@ -53,6 +54,7 @@ struct exynos_tmu_data {
>  	int id;
>  	struct exynos_tmu_platform_data *pdata;
>  	void __iomem *base;
> +	void __iomem *base_common;
>  	int irq;
>  	enum soc_type soc;
>  	struct work_struct irq_work;
> @@ -478,6 +480,24 @@ static int exynos_map_dt_data(struct platform_device *pdev)
>  		return -ENODEV;
>  	}
>  	data->pdata = pdata;
> +	/*
> +	 * Check if the TMU shares some registers and then try to map the
> +	 * memory of common registers.
> +	 */
> +	if (!TMU_SUPPORTS(pdata, SHARED_MEMORY))
> +		return 0;
> +
> +	if (of_address_to_resource(pdev->dev.of_node, 1, &res)) {
> +		dev_err(&pdev->dev, "failed to get Resource 1\n");
> +		return -ENODEV;
> +	}
> +
> +	data->base_common = devm_ioremap(&pdev->dev, res.start,
> +					resource_size(&res));
> +	if (!data->base) {
> +		dev_err(&pdev->dev, "Failed to ioremap memory\n");
> +		return -ENOMEM;
> +	}
>  
>  	return 0;
>  }
> 


-- 
You have got to be excited about what you are doing. (L. Lamport)

Eduardo Valentin


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