Aminopyridine compound and application thereof

A compound of formula (P) or a pharmaceutically acceptable salt thereof,

• wherein,
• ring A is selected from
• T1 and T2 are selected from CH and N;
• L1 is selected from —O—, —CH2O— and —OCH2—, and the —CH2O— and —OCH2 are optionally substituted by 1 or 2 halogens;
• each R1 is independently selected from H, F, Cl, Br, I, OH, and NH2;
• each R2 is independently selected from F, Cl, OH, NH2, and C1-3 alkyl, and the C1-3 alkyl is optionally substituted by 1, 2, or 3 Ra;
• R3 is selected from
• each R4 is independently selected from H, F, Cl, Br, and I;
• each Ra is independently selected from F, Cl, Br, and I;
• m is selected from 1, 2, 3, and 4;
• n is selected from 1, 2, 3, and 4;
• z is selected from 1, 2, and 3.