linux-kernel - Re: [PATCH v2 5/8] mfd: exynos-lpass: Remove pad retention control

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Date:   Wed, 8 Feb 2017 10:56:18 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     linux-gpio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH v2 5/8] mfd: exynos-lpass: Remove pad retention control

On Thu, 26 Jan 2017, Marek Szyprowski wrote:

> Pad retention should be controlled from pin control driver, so remove it
> from Exynos LPASS driver. After this change, no more access to PMU regmap
> is needed, so remove also the code for handling PMU regmap.
> 
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> Acked-by: Krzysztof Kozlowski <krzk@...nel.org>
> ---
>  .../bindings/mfd/samsung,exynos5433-lpass.txt           |  2 --
>  drivers/mfd/exynos-lpass.c                              | 17 -----------------
>  include/linux/mfd/syscon/exynos5-pmu.h                  |  3 ---
>  3 files changed, 22 deletions(-)

Love the diff! :)

For my own reference:
  Acked-for-MFD-by: Lee Jones <lee.jones@...aro.org>
  
> diff --git a/Documentation/devicetree/bindings/mfd/samsung,exynos5433-lpass.txt b/Documentation/devicetree/bindings/mfd/samsung,exynos5433-lpass.txt
> index c110e118b79f..a8deaee82c44 100644
> --- a/Documentation/devicetree/bindings/mfd/samsung,exynos5433-lpass.txt
> +++ b/Documentation/devicetree/bindings/mfd/samsung,exynos5433-lpass.txt
> @@ -5,7 +5,6 @@ Required properties:
>   - compatible		: "samsung,exynos5433-lpass"
>   - reg			: should contain the LPASS top SFR region location
>  			  and size
> - - samsung,pmu-syscon	: the phandle to the Power Management Unit node
>   - #address-cells	: should be 1
>   - #size-cells		: should be 1
>   - ranges		: must be present
> @@ -25,7 +24,6 @@ Example:
>  audio-subsystem {
>  	compatible = "samsung,exynos5433-lpass";
>  	reg = <0x11400000 0x100>, <0x11500000 0x08>;
> -	samsung,pmu-syscon = <&pmu_system_controller>;
>  	#address-cells = <1>;
>  	#size-cells = <1>;
>  	ranges;
> diff --git a/drivers/mfd/exynos-lpass.c b/drivers/mfd/exynos-lpass.c
> index 2e064fb8826f..17915daa2e80 100644
> --- a/drivers/mfd/exynos-lpass.c
> +++ b/drivers/mfd/exynos-lpass.c
> @@ -18,7 +18,6 @@
>  #include <linux/io.h>
>  #include <linux/module.h>
>  #include <linux/mfd/syscon.h>
> -#include <linux/mfd/syscon/exynos5-pmu.h>
>  #include <linux/of.h>
>  #include <linux/of_platform.h>
>  #include <linux/platform_device.h>
> @@ -51,8 +50,6 @@
>  #define  LPASS_INTR_SFR			BIT(0)
>  
>  struct exynos_lpass {
> -	/* pointer to the Power Management Unit regmap */
> -	struct regmap *pmu;
>  	/* pointer to the LPASS TOP regmap */
>  	struct regmap *top;
>  };
> @@ -81,10 +78,6 @@ static void exynos_lpass_enable(struct exynos_lpass *lpass)
>  	regmap_write(lpass->top, SFR_LPASS_INTR_CPU_MASK,
>  		     LPASS_INTR_SFR | LPASS_INTR_DMA | LPASS_INTR_I2S);
>  
> -	/* Activate related PADs from retention state */
> -	regmap_write(lpass->pmu, EXYNOS5433_PAD_RETENTION_AUD_OPTION,
> -		     EXYNOS5433_PAD_INITIATE_WAKEUP_FROM_LOWPWR);
> -
>  	exynos_lpass_core_sw_reset(lpass, LPASS_I2S_SW_RESET);
>  	exynos_lpass_core_sw_reset(lpass, LPASS_DMA_SW_RESET);
>  	exynos_lpass_core_sw_reset(lpass, LPASS_MEM_SW_RESET);
> @@ -95,9 +88,6 @@ static void exynos_lpass_disable(struct exynos_lpass *lpass)
>  	/* Mask any unmasked IP interrupt sources */
>  	regmap_write(lpass->top, SFR_LPASS_INTR_CPU_MASK, 0);
>  	regmap_write(lpass->top, SFR_LPASS_INTR_CA5_MASK, 0);
> -
> -	/* Deactivate related PADs from retention state */
> -	regmap_write(lpass->pmu, EXYNOS5433_PAD_RETENTION_AUD_OPTION, 0);
>  }
>  
>  static const struct regmap_config exynos_lpass_reg_conf = {
> @@ -131,13 +121,6 @@ static int exynos_lpass_probe(struct platform_device *pdev)
>  		return PTR_ERR(lpass->top);
>  	}
>  
> -	lpass->pmu = syscon_regmap_lookup_by_phandle(dev->of_node,
> -						"samsung,pmu-syscon");
> -	if (IS_ERR(lpass->pmu)) {
> -		dev_err(dev, "Failed to lookup PMU regmap\n");
> -		return PTR_ERR(lpass->pmu);
> -	}
> -
>  	platform_set_drvdata(pdev, lpass);
>  	exynos_lpass_enable(lpass);
>  
> diff --git a/include/linux/mfd/syscon/exynos5-pmu.h b/include/linux/mfd/syscon/exynos5-pmu.h
> index c28ff21ca4d2..0622ae86f9db 100644
> --- a/include/linux/mfd/syscon/exynos5-pmu.h
> +++ b/include/linux/mfd/syscon/exynos5-pmu.h
> @@ -46,7 +46,4 @@
>  #define EXYNOS5_MIPI_PHY_S_RESETN		BIT(1)
>  #define EXYNOS5_MIPI_PHY_M_RESETN		BIT(2)
>  
> -#define EXYNOS5433_PAD_RETENTION_AUD_OPTION		(0x3028)
> -#define EXYNOS5433_PAD_INITIATE_WAKEUP_FROM_LOWPWR	BIT(28)
> -
>  #endif /* _LINUX_MFD_SYSCON_PMU_EXYNOS5_H_ */

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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