1*4882a593SmuzhiyunKernel driver aspeed-pwm-tacho 2*4882a593Smuzhiyun============================== 3*4882a593Smuzhiyun 4*4882a593SmuzhiyunSupported chips: 5*4882a593Smuzhiyun ASPEED AST2400/2500 6*4882a593Smuzhiyun 7*4882a593SmuzhiyunAuthors: 8*4882a593Smuzhiyun <jaghu@google.com> 9*4882a593Smuzhiyun 10*4882a593SmuzhiyunDescription: 11*4882a593Smuzhiyun------------ 12*4882a593SmuzhiyunThis driver implements support for ASPEED AST2400/2500 PWM and Fan Tacho 13*4882a593Smuzhiyuncontroller. The PWM controller supports upto 8 PWM outputs. The Fan tacho 14*4882a593Smuzhiyuncontroller supports up to 16 tachometer inputs. 15*4882a593Smuzhiyun 16*4882a593SmuzhiyunThe driver provides the following sensor accesses in sysfs: 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun=============== ======= ===================================================== 19*4882a593SmuzhiyunfanX_input ro provide current fan rotation value in RPM as reported 20*4882a593Smuzhiyun by the fan to the device. 21*4882a593Smuzhiyun 22*4882a593SmuzhiyunpwmX rw get or set PWM fan control value. This is an integer 23*4882a593Smuzhiyun value between 0(off) and 255(full speed). 24*4882a593Smuzhiyun=============== ======= ===================================================== 25