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imx: imx_clock: uart: Add UART clock API 

This patch adds an API to configure up the base UART clocks, taking a
bit-mask of silicon specific bits as an input from a higher layer in order
to direct the necessary clock source.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
This commit is contained in:
Bryan O'Donoghue 2018-05-30 19:56:54 +01:00
parent 82e3508300
commit dcd54e9b4c
2 changed files with 35 additions and 0 deletions
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32
plat/imx/common/imx_clock.c
View File

@ -50,3 +50,35 @@ void imx_clock_gate_enable(unsigned int id, bool enable)
mmio_write_32(addr, CCM_CCGR_SETTING0_DOM_CLK_ALWAYS);
}
void imx_clock_enable_uart(unsigned int uart_id, uint32_t uart_clk_en_bits)
{
unsigned int ccm_trgt_id = CCM_TRT_ID_UART1_CLK_ROOT + uart_id;
unsigned int ccm_ccgr_id = CCM_CCGR_ID_UART1 + uart_id;
/* Check for error */
if (uart_id > MXC_MAX_UART_NUM)
return;
/* Set target register values */
imx_clock_target_set(ccm_trgt_id, uart_clk_en_bits);
/* Enable the clock gate */
imx_clock_gate_enable(ccm_ccgr_id, true);
}
void imx_clock_disable_uart(unsigned int uart_id)
{
unsigned int ccm_trgt_id = CCM_TRT_ID_UART1_CLK_ROOT + uart_id;
unsigned int ccm_ccgr_id = CCM_CCGR_ID_UART1 + uart_id;
/* Check for error */
if (uart_id > MXC_MAX_UART_NUM)
return;
/* Disable the clock gate */
imx_clock_gate_enable(ccm_ccgr_id, false);
/* Clear the target */
imx_clock_target_clr(ccm_trgt_id, 0xFFFFFFFF);
}

3
plat/imx/common/include/imx_clock.h
View File

@ -989,4 +989,7 @@ void imx_clock_gate_enable(unsigned int id, bool enable);
void imx_clock_init(void);
void imx_clock_enable_uart(unsigned int uart_id, uint32_t uart_clk_en_bits);
void imx_clock_disable_uart(unsigned int uart_id);
#endif /* __IMX_CLOCK_H__ */