[U-Boot] [PATCH v5 19/26] arm:trats:pmic: Power consumption reduction state for Samsung's TRATS board
Minkyu Kang
mk7.kang at samsung.com
Thu Nov 8 11:32:09 CET 2012
On 06/11/12 02:28, Lukasz Majewski wrote:
> When charging battery is necessary, the development board needs to
> be turned into low power mode for better efficiency.
>
> Signed-off-by: Lukasz Majewski <l.majewski at samsung.com>
> Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
> Cc: Minkyu Kang <mk7.kang at samsung.com>
> ---
> Changes for v2:
> - None
> Changes for v3:
> - None
> Changes for v4:
> - None
> Changes for v5:
> - None
> ---
> board/samsung/trats/trats.c | 41 +++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 41 insertions(+), 0 deletions(-)
>
> diff --git a/board/samsung/trats/trats.c b/board/samsung/trats/trats.c
> index 5c23744..a8a97bf 100644
> --- a/board/samsung/trats/trats.c
> +++ b/board/samsung/trats/trats.c
> @@ -89,6 +89,47 @@ void i2c_init_board(void)
> s5p_gpio_direction_output(&gpio2->y4, 1, 1);
> }
>
> +static void trats_low_power_mode(void)
> +{
> + struct exynos4_clock *clk =
> + (struct exynos4_clock *)samsung_get_base_clock();
> + struct exynos4_power *pwr =
> + (struct exynos4_power *)samsung_get_base_power();
> +
> + /* Power down CORE1 */
> + writel(0x0, &pwr->arm_core1_configuration);
> +
> + /* Change the APLL frequency */
> + writel(0xa0c80604, &clk->apll_con0);
Magic code?
please define this codes or at least add some comments here.
> + /* Change CPU0 clock divider */
> + writel(0x00000100, &clk->div_cpu0);
> + /* CLK_DIV_STAT_CPU0 - wait until clock gets stable */
> + while (readl(&clk->div_stat_cpu0) & 0x1111111)
> + ;
> +
> + /* Change clock divider ratio for DMC */
> + writel(0x13113117, &clk->div_dmc0);
ditto.
> + while (readl(&clk->div_stat_dmc0) & 0x11111111)
> + ;
> +
> + /* Turn off unnecessary power domains */
> + writel(0x0, &pwr->xxti_configuration); /* XXTI */
> + writel(0x0, &pwr->cam_configuration); /* CAM */
> + writel(0x0, &pwr->tv_configuration); /* TV */
> + writel(0x0, &pwr->mfc_configuration); /* MFC */
> + writel(0x0, &pwr->g3d_configuration); /* G3D */
> + writel(0x0, &pwr->gps_configuration); /* GPS */
> + writel(0x0, &pwr->gps_alive_configuration); /* GPS_ALIVE */
> +
> + /* Turn off unnecessary clocks */
> + writel(0x0, &clk->gate_ip_cam); /* CAM */
> + writel(0x0, &clk->gate_ip_tv); /* TV */
> + writel(0x0, &clk->gate_ip_mfc); /* MFC */
> + writel(0x0, &clk->gate_ip_g3d); /* G3D */
> + writel(0x0, &clk->gate_ip_image); /* IMAGE */
> + writel(0x0, &clk->gate_ip_gps); /* GPS */
> +}
> +
> static int pmic_init_max8997(void)
> {
> struct pmic *p = pmic_get("MAX8997_PMIC");
>
Thanks.
Minkyu Kang.
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