1config CLK_AT91 2 bool "AT91 clock drivers" 3 depends on CLK 4 select MISC 5 help 6 This option is used to enable the AT91 clock driver. 7 The driver supports the AT91 clock generator, including 8 the oscillators and PLLs, such as main clock, slow clock, 9 PLLA, UTMI PLL. Clocks can also be a source clock of other 10 clocks a tree structure, such as master clock, usb device 11 clock, matrix clock and generic clock. 12 Devices can use a common clock API to request a particular 13 clock, enable it and get its rate. 14 15config AT91_UTMI 16 bool "Support UTMI PLL Clock" 17 depends on CLK_AT91 18 help 19 This option is used to enable the AT91 UTMI PLL clock 20 driver. It is the clock provider of USB, and UPLLCK is the 21 output of 480 MHz UTMI PLL, The souce clock of the UTMI 22 PLL is the main clock, so the main clock must select the 23 fast crystal oscillator to meet the frequency accuracy 24 required by USB. 25 26config AT91_H32MX 27 bool "Support H32MX 32-bit Matrix Clock" 28 depends on CLK_AT91 29 help 30 This option is used to enable the AT91 H32MX matrixes 31 clock driver. There are H64MX and H32MX matrixes clocks, 32 H64MX 64-bit matrix clocks are MCK. The H32MX 32-bit 33 matrix clock is to be configured as MCK if MCK does not 34 exceed 83 MHz, else it is to be configured as MCK/2. 35 36config AT91_GENERIC_CLK 37 bool "Support Generic Clock" 38 depends on CLK_AT91 39 help 40 This option is used to enable the AT91 generic clock 41 driver. Some peripherals may need a second clock source 42 that may be different from the system clock. This second 43 clock is the generic clock (GCLK) and is managed by 44 the PMC via PMC_PCR register. 45