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![Wenyou Yang](/assets/img/avatar_default.png)
By default, it is assumed that the UTMI clock is generated from a 12 MHz reference clock (MAINCK). If it's not the case, the FREQ field of the SFR_UTMICKTRIM has to be updated to generate the UTMI clock in the proper way. The UTMI clock has a fixed rate of 480 MHz. In fact, there is no multiplier we can configure. The multiplier is managed internally, depending on the reference clock frequency, to achieve the target of 480 MHz. The patch is cloned from the patch of mailing-list: [PATCH v2] clk: at91: utmi: set the mainck rate Signed-off-by: Wenyou Yang <wenyou.yang@microchip.com> [trini: Depend on SPL_DM] Signed-off-by: Tom Rini <trini@konsulko.com>
49 lines
1.7 KiB
Plaintext
49 lines
1.7 KiB
Plaintext
config CLK_AT91
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bool "AT91 clock drivers"
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depends on CLK
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select MISC
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help
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This option is used to enable the AT91 clock driver.
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The driver supports the AT91 clock generator, including
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the oscillators and PLLs, such as main clock, slow clock,
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PLLA, UTMI PLL. Clocks can also be a source clock of other
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clocks a tree structure, such as master clock, usb device
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clock, matrix clock and generic clock.
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Devices can use a common clock API to request a particular
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clock, enable it and get its rate.
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config AT91_UTMI
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bool "Support UTMI PLL Clock"
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depends on CLK_AT91 && SPL_DM
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select REGMAP
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select SPL_REGMAP
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select SYSCON
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select SPL_SYSCON
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help
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This option is used to enable the AT91 UTMI PLL clock
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driver. It is the clock provider of USB, and UPLLCK is the
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output of 480 MHz UTMI PLL, The souce clock of the UTMI
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PLL is the main clock, so the main clock must select the
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fast crystal oscillator to meet the frequency accuracy
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required by USB.
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config AT91_H32MX
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bool "Support H32MX 32-bit Matrix Clock"
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depends on CLK_AT91
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help
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This option is used to enable the AT91 H32MX matrixes
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clock driver. There are H64MX and H32MX matrixes clocks,
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H64MX 64-bit matrix clocks are MCK. The H32MX 32-bit
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matrix clock is to be configured as MCK if MCK does not
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exceed 83 MHz, else it is to be configured as MCK/2.
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config AT91_GENERIC_CLK
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bool "Support Generic Clock"
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depends on CLK_AT91
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help
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This option is used to enable the AT91 generic clock
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driver. Some peripherals may need a second clock source
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that may be different from the system clock. This second
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clock is the generic clock (GCLK) and is managed by
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the PMC via PMC_PCR register.
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