VT1211_REG_PWM_CLK
data->pwm_clk = vt1211_read8(data, VT1211_REG_PWM_CLK);
reg = vt1211_read8(data, VT1211_REG_PWM_CLK);
vt1211_write8(data, VT1211_REG_PWM_CLK, data->pwm_clk);