From: Tom Rini <trini@konsulko.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH v2 3/3] ARM: DRA7: Fixup DSPEVE, IVA and GPU clock frequencies based on OPP
Date: Wed, 23 Nov 2016 13:06:45 -0500 [thread overview]
Message-ID: <20161123180645.GL2546@bill-the-cat> (raw)
In-Reply-To: <20161123072441.32630-4-lokeshvutla@ti.com>
On Wed, Nov 23, 2016 at 12:54:41PM +0530, Lokesh Vutla wrote:
> From: Suman Anna <s-anna@ti.com>
>
> This patch adds support to update the device-tree blob to adjust the
> DSP and IVA DPLL clocks pertinent to the selected OPP choice, with
> the default being OPP_NOM. The voltage settings are done in u-boot,
> but the actual clock configuration itself is done in kernel because
> of the following reasons:
> 1. SoC definition constraints us to NOT to do dynamic voltage
> scaling ever after the initial avs0 setting in bootloader
> - so the voltage must be set in bootloader.
> 2. The voltage level must be set even if the IP blocks like
> GPU/DSP are unused.
> 3. The IVA, GPU and DSP DPLLs are not essential for u-boot functionality,
> and similar DPLL clock configuration code has been cleaned up in
> v2014.10 u-boot release. See commit, 02c41535b6a4 ("ARM: OMAP4/5:
> Remove dead code against CONFIG_SYS_CLOCKS_ENABLE_ALL").
>
> The non-essential DPLLs are configured within the kernel during
> the clock init step when parsing the device tree and creating
> the clock devices. This approach meets both the u-boot and kernel
> needs.
>
> Signed-off-by: Suman Anna <s-anna@ti.com>
> Signed-off-by: Subhajit Paul <subhajit_paul@ti.com>
> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
--
Tom
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next prev parent reply other threads:[~2016-11-23 18:06 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-23 7:24 [U-Boot] [PATCH v2 0/3] ARM: DRA7: Add Kconfig support for selecting OPPs Lokesh Vutla
2016-11-23 7:24 ` [U-Boot] [PATCH v2 1/3] ARM: OMAP4+: Add support for dynamically " Lokesh Vutla
2016-11-23 18:05 ` Tom Rini
2016-12-04 23:17 ` [U-Boot] [U-Boot, v2, " Tom Rini
2016-11-23 7:24 ` [U-Boot] [PATCH v2 2/3] ARM: DRA7: Redefine voltage and efuse macros per OPP using Kconfig Lokesh Vutla
2016-11-23 18:06 ` Tom Rini
2016-12-04 23:18 ` [U-Boot] [U-Boot, v2, " Tom Rini
2016-11-23 7:24 ` [U-Boot] [PATCH v2 3/3] ARM: DRA7: Fixup DSPEVE, IVA and GPU clock frequencies based on OPP Lokesh Vutla
2016-11-23 18:06 ` Tom Rini [this message]
2016-12-04 23:19 ` [U-Boot] [U-Boot, v2, " Tom Rini
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