From: Tom Rini <trini@konsulko.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [U-Boot, v6, 4/9] ARM: at91: spl: Add mck function to lower rate while switching
Date: Thu, 14 Sep 2017 20:47:54 -0400 [thread overview]
Message-ID: <20170915004754.GG4560@bill-the-cat> (raw)
In-Reply-To: <20170913065854.26134-5-wenyou.yang@microchip.com>
On Wed, Sep 13, 2017 at 02:58:49PM +0800, Wenyou Yang wrote:
> Refer to the commit 70f8c8316ad(PMC: add new mck function to lower
> rate while switching) from AT91Bootstrap.
>
> While switching to a lower clock source, we must switch the clock
> source first instead of last. Otherwise, we could end up with
> too high frequency on internal bus and peripherals.
> This happens on SAMA5D2 as exitting from the ROM code.
>
> Add a function pmc_mck_init_down() to allow this sequence.
>
> Signed-off-by: Wenyou Yang <wenyou.yang@microchip.com>
> Reviewed-by: Simon Glass <sjg@chromium.org>
Applied to u-boot/master, thanks!
--
Tom
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next prev parent reply other threads:[~2017-09-15 0:47 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-13 6:58 [U-Boot] [PATCH v6 0/9] board: atmel: Add new board SAMA5D27-SOM1-EK board Wenyou Yang
2017-09-13 6:58 ` [U-Boot] [PATCH v6 1/9] lib: at91: Add logo files used via API of DM_VIDEO Wenyou Yang
2017-09-15 0:47 ` [U-Boot] [U-Boot, v6, " Tom Rini
2017-09-13 6:58 ` [U-Boot] [PATCH v6 2/9] atmel: common: Add function to display via DM_VIDEO's API Wenyou Yang
2017-09-15 0:47 ` [U-Boot] [U-Boot, v6, " Tom Rini
2017-09-13 6:58 ` [U-Boot] [PATCH v6 3/9] ARM: at91: spl: Adjust switching to oscillator for SAMA5D2 Wenyou Yang
2017-09-15 0:47 ` [U-Boot] [U-Boot, v6, " Tom Rini
2017-09-13 6:58 ` [U-Boot] [PATCH v6 4/9] ARM: at91: spl: Add mck function to lower rate while switching Wenyou Yang
2017-09-15 0:47 ` Tom Rini [this message]
2017-09-13 6:58 ` [U-Boot] [PATCH v6 5/9] board: sama5d2_xplained: Make SPL work on spiflash Wenyou Yang
2017-09-15 0:47 ` [U-Boot] [U-Boot, v6, " Tom Rini
2017-09-13 6:58 ` [U-Boot] [PATCH v6 6/9] ARM: at91: spl: Add boot device for boot from QSPI Wenyou Yang
2017-09-15 0:48 ` [U-Boot] [U-Boot, v6, " Tom Rini
2017-09-13 6:58 ` [U-Boot] [PATCH v6 7/9] ARM: at91: mach: Add missing defines of MPDDRC Wenyou Yang
2017-09-15 0:48 ` [U-Boot] [U-Boot, v6, " Tom Rini
2017-09-13 6:58 ` [U-Boot] [PATCH v6 8/9] ARM: at91: Get the Chip ID of SAMA5D2 SiP Wenyou Yang
2017-09-15 0:48 ` [U-Boot] [U-Boot, v6, " Tom Rini
2017-09-13 6:58 ` [U-Boot] [PATCH v6 9/9] board: atmel: Add SAMA5D27 SOM1 EK board Wenyou Yang
2017-09-15 0:48 ` [U-Boot] [U-Boot, v6, " Tom Rini
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