linux-kernel - Re: [PATCH RFC 3/5] ARM: samsung: add clock setup for FIMC and FIMD

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Date:	Mon, 26 Aug 2013 18:19:18 +0200
From:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:	Mateusz Krawczuk <m.krawczuk@...tner.samsung.com>
Cc:	kgene.kim@...sung.com, kyungmin.park@...sung.com,
	t.figa@...sung.com, tomasz.figa@...il.com, rob.herring@...xeda.com,
	pawel.moll@....com, mark.rutland@....com, swarren@...dotorg.org,
	ian.campbell@...rix.com, rob@...dley.net, mturquette@...aro.org,
	thomas.abraham@...aro.org, t.stanislaws@...sung.com,
	m.chehab@...sung.com, s.nawrocki@...sung.com,
	m.szyprowski@...ung.com, linux-kernel@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux@....linux.org.uk,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH RFC 3/5] ARM: samsung: add clock setup for FIMC and FIMD


Hi,

On Monday, August 26, 2013 01:38:32 PM Mateusz Krawczuk wrote:
> This patch adds code that sets correct parents and rates for clocks
> used by FIMC and FIMD on Goni board.
> 
> Signed-off-by: Mateusz Krawczuk <m.krawczuk@...tner.samsung.com>
> ---
>  arch/arm/mach-s5pv210/mach-goni.c | 48 +++++++++++++++++++++++++++++++++++++++
>  1 file changed, 48 insertions(+)
> 
> diff --git a/arch/arm/mach-s5pv210/mach-goni.c b/arch/arm/mach-s5pv210/mach-goni.c
> index e5cd9fb..309b5ad 100644
> --- a/arch/arm/mach-s5pv210/mach-goni.c
> +++ b/arch/arm/mach-s5pv210/mach-goni.c
> @@ -55,6 +55,7 @@
>  #include <media/s5p_fimc.h>
>  #include <media/noon010pc30.h>
>  
> +#include <linux/clk.h>
>  #include "common.h"
>  
>  /* Following are default values for UCON, ULCON and UFCON UART registers */
> @@ -195,6 +196,49 @@ static struct platform_device goni_spi_gpio = {
>  	},
>  };
>  
> +static void set_fimd_clock(void)

It can be marked as __init.

> +{
> +	struct clk *lcd_clk, *parent_clk;
> +
> +	lcd_clk = clk_get(NULL, "sclk_fimd");
> +	parent_clk = clk_get(NULL, "mout_mpll");
> +	clk_set_parent(lcd_clk, parent_clk);
> +	clk_set_rate(lcd_clk, clk_get_rate(parent_clk)/3);
> +
> +	clk_put(parent_clk);
> +	clk_put(lcd_clk);
> +}
> +
> +static void set_fimc_clock(void)

ditto

> +{
> +	struct clk *cam0_clk, *cam1_clk, *fimc2_clk, *fimc1_clk,
> +			*fimc0_clk, *parent_clk, *vpll_clk, *csis_clk;
> +
> +	parent_clk = clk_get(NULL, "mout_mpll");
> +	vpll_clk = clk_get(NULL, "mout_vpll");
> +	cam0_clk = clk_get(NULL, "mout_cam0");
> +	cam1_clk = clk_get(NULL, "mout_cam1");
> +	fimc2_clk = clk_get(NULL, "mout_fimc2");
> +	fimc1_clk = clk_get(NULL, "mout_fimc1");
> +	fimc0_clk = clk_get(NULL, "mout_fimc0");
> +	csis_clk = clk_get(NULL, "mout_csis");

Shouldn't you check clk_get() return value with IS_ERR()?

You can do one big check here and than just do clk_put() if !IS_ERR(), i.e.

if (IS_ERR(parent_clk) || IS_ERR(vpll_clk) || ...)
...

clk_set_parent()
...

if (!IS_ERR(parent_clk))
	clk_put(parent_clk);
...

> +	clk_set_parent(cam0_clk, vpll_clk);
> +	clk_set_parent(cam1_clk, vpll_clk);
> +	clk_set_parent(fimc2_clk, parent_clk);
> +	clk_set_parent(fimc1_clk, parent_clk);
> +	clk_set_parent(fimc0_clk, parent_clk);
> +	clk_set_parent(csis_clk, parent_clk);
> +
> +	clk_put(parent_clk);
> +	clk_put(vpll_clk);
> +	clk_put(cam0_clk);
> +	clk_put(cam1_clk);
> +	clk_put(fimc2_clk);
> +	clk_put(fimc1_clk);
> +	clk_put(fimc0_clk);
> +}
> +
>  /* KEYPAD */
>  static uint32_t keymap[] __initdata = {
>  	/* KEY(row, col, keycode) */
> @@ -931,6 +975,10 @@ static void __init goni_machine_init(void)
>  	s3c_i2c2_set_platdata(&i2c2_data);
>  	i2c_register_board_info(2, i2c2_devs, ARRAY_SIZE(i2c2_devs));
>  
> +	/* FIMD AND FIMC set clock config */
> +	set_fimd_clock();
> +	set_fimc_clock();
> +
>  	/* PMIC */
>  	goni_pmic_init();
>  	i2c_register_board_info(AP_I2C_GPIO_PMIC_BUS_4, i2c_gpio_pmic_devs,

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

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