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Starting with the s3c2443 the s3c24xx series got a new clock tree compared to the previous s3c24xx socs. This binding describes the clock controller found in the s3c2443, s3c2416 and s3c2450 socs. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Acked-by: Tomasz Figa <t.figa@samsung.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
57 lines
1.9 KiB
Plaintext
57 lines
1.9 KiB
Plaintext
* Samsung S3C2443 Clock Controller
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The S3C2443 clock controller generates and supplies clock to various controllers
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within the SoC. The clock binding described here is applicable to all SoCs in
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the s3c24x family starting with the s3c2443.
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Required Properties:
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- compatible: should be one of the following.
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- "samsung,s3c2416-clock" - controller compatible with S3C2416 SoC.
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- "samsung,s3c2443-clock" - controller compatible with S3C2443 SoC.
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- "samsung,s3c2450-clock" - controller compatible with S3C2450 SoC.
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- reg: physical base address of the controller and length of memory mapped
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region.
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- #clock-cells: should be 1.
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Each clock is assigned an identifier and client nodes can use this identifier
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to specify the clock which they consume. Some of the clocks are available only
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on a particular SoC.
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All available clocks are defined as preprocessor macros in
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dt-bindings/clock/s3c2443.h header and can be used in device
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tree sources.
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External clocks:
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There are several clocks that are generated outside the SoC. It is expected
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that they are defined using standard clock bindings with following
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clock-output-names:
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- "xti" - crystal input - required,
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- "ext" - external clock source - optional,
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- "ext_i2s" - external I2S clock - optional,
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- "ext_uart" - external uart clock - optional,
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Example: Clock controller node:
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clocks: clock-controller@4c000000 {
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compatible = "samsung,s3c2416-clock";
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reg = <0x4c000000 0x40>;
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#clock-cells = <1>;
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};
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Example: UART controller node that consumes the clock generated by the clock
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controller (refer to the standard clock bindings for information about
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"clocks" and "clock-names" properties):
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serial@50004000 {
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compatible = "samsung,s3c2440-uart";
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reg = <0x50004000 0x4000>;
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interrupts = <1 23 3 4>, <1 23 4 4>;
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clock-names = "uart", "clk_uart_baud2",
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"clk_uart_baud3";
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clocks = <&clocks PCLK_UART0>, <&clocks PCLK_UART0>,
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<&clocks SCLK_UART>;
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status = "disabled";
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};
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