diff options
Diffstat (limited to 'drivers/clk')
| -rw-r--r-- | drivers/clk/qcom/gcc-msm8939.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/clk/qcom/gcc-msm8939.c b/drivers/clk/qcom/gcc-msm8939.c index af608f165896..712073f9dc69 100644 --- a/drivers/clk/qcom/gcc-msm8939.c +++ b/drivers/clk/qcom/gcc-msm8939.c @@ -1033,7 +1033,20 @@ static struct clk_rcg2 cci_clk_src = { }, }; +/* + * This is a frequency table for "General Purpose" clocks. + * These clocks can be muxed to the SoC pins and may be used by + * external devices. They're often used as PWM source. + * + * See comment at ftbl_gcc_gp1_3_clk. + */ static const struct freq_tbl ftbl_gcc_camss_gp0_1_clk[] = { + F(10000, P_XO, 16, 1, 120), + F(100000, P_XO, 16, 1, 12), + F(500000, P_GPLL0, 16, 1, 100), + F(1000000, P_GPLL0, 16, 1, 50), + F(2500000, P_GPLL0, 16, 1, 20), + F(5000000, P_GPLL0, 16, 1, 10), F(100000000, P_GPLL0, 8, 0, 0), F(200000000, P_GPLL0, 4, 0, 0), { } @@ -1198,7 +1211,29 @@ static struct clk_rcg2 crypto_clk_src = { }, }; +/* + * This is a frequency table for "General Purpose" clocks. + * These clocks can be muxed to the SoC pins and may be used by + * external devices. They're often used as PWM source. + * + * Please note that MND divider must be enabled for duty-cycle + * control to be possible. (M != N) Also since D register is configured + * with a value multiplied by 2, and duty cycle is calculated as + * (2 * D) % 2^W + * DutyCycle = ---------------- + * 2 * (N % 2^W) + * (where W = .mnd_width) + * N must be half or less than maximum value for the register. + * Otherwise duty-cycle control would be limited. + * (e.g. for 8-bit NMD N should be less than 128) + */ static const struct freq_tbl ftbl_gcc_gp1_3_clk[] = { + F(10000, P_XO, 16, 1, 120), + F(100000, P_XO, 16, 1, 12), + F(500000, P_GPLL0, 16, 1, 100), + F(1000000, P_GPLL0, 16, 1, 50), + F(2500000, P_GPLL0, 16, 1, 20), + F(5000000, P_GPLL0, 16, 1, 10), F(19200000, P_XO, 1, 0, 0), { } }; |