Tomasz Figa | 9978f28 | 2014-07-02 19:28:27 +0200 | [diff] [blame] | 1 | * Samsung Audio Subsystem Clock Controller |
| 2 | |
| 3 | The Samsung Audio Subsystem clock controller generates and supplies clocks |
| 4 | to Audio Subsystem block available in the S5PV210 and compatible SoCs. |
| 5 | |
| 6 | Required Properties: |
| 7 | |
| 8 | - compatible: should be "samsung,s5pv210-audss-clock". |
| 9 | - reg: physical base address and length of the controller's register set. |
| 10 | |
| 11 | - #clock-cells: should be 1. |
| 12 | |
| 13 | - clocks: |
| 14 | - hclk: AHB bus clock of the Audio Subsystem. |
| 15 | - xxti: Optional fixed rate PLL reference clock, parent of mout_audss. If |
| 16 | not specified (i.e. xusbxti is used for PLL reference), it is fixed to |
| 17 | a clock named "xxti". |
| 18 | - fout_epll: Input PLL to the AudioSS block, parent of mout_audss. |
| 19 | - iiscdclk0: Optional external i2s clock, parent of mout_i2s. If not |
| 20 | specified, it is fixed to a clock named "iiscdclk0". |
| 21 | - sclk_audio0: Audio bus clock, parent of mout_i2s. |
| 22 | |
| 23 | - clock-names: Aliases for the above clocks. They should be "hclk", |
| 24 | "xxti", "fout_epll", "iiscdclk0", and "sclk_audio0" respectively. |
| 25 | |
| 26 | All available clocks are defined as preprocessor macros in |
| 27 | dt-bindings/clock/s5pv210-audss-clk.h header and can be used in device |
| 28 | tree sources. |
| 29 | |
| 30 | Example: Clock controller node. |
| 31 | |
| 32 | clk_audss: clock-controller@c0900000 { |
| 33 | compatible = "samsung,s5pv210-audss-clock"; |
| 34 | reg = <0xc0900000 0x1000>; |
| 35 | #clock-cells = <1>; |
| 36 | clock-names = "hclk", "xxti", |
| 37 | "fout_epll", "sclk_audio0"; |
| 38 | clocks = <&clocks DOUT_HCLKP>, <&xxti>, |
| 39 | <&clocks FOUT_EPLL>, <&clocks SCLK_AUDIO0>; |
| 40 | }; |
| 41 | |
| 42 | Example: I2S controller node that consumes the clock generated by the clock |
| 43 | controller. Refer to the standard clock bindings for information |
| 44 | about 'clocks' and 'clock-names' property. |
| 45 | |
| 46 | i2s0: i2s@03830000 { |
| 47 | /* ... */ |
| 48 | clock-names = "iis", "i2s_opclk0", |
| 49 | "i2s_opclk1"; |
| 50 | clocks = <&clk_audss CLK_I2S>, <&clk_audss CLK_I2S>, |
| 51 | <&clk_audss CLK_DOUT_AUD_BUS>; |
| 52 | /* ... */ |
| 53 | }; |